13-3619 | Omnilex

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13‐3619‐cv; 13‐3782‐cv
In re September 11 Litigation
UNITED STATES COURT OF APPEALS 1
FOR THE SECOND CIRCUIT 2
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August Term 2014 4
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(Argued: January 14, 2015 Decided: September 17, 2015) 6
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Nos. 13‐3619‐cv, 13‐3782‐cv 8
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–––––––––––––––––––––––––––––––––––– 10
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IN R E S EPTEMBER 11 L ITIGATION: 12
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W ORLD TRADE C ENTER PROPERTIES LLC, 1 WORLD TRADE C ENTER L.L.C., 3 W ORLD 14
TRADE C ENTER L.L.C., 7 WORLD TRADE C ENTER COMPANY , L.P. 15
16
Plaintiffs‐Appellants, 17
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WORLD TRADE F ARMERS MARKET, INC., A DEM A RICI, L AUREN PETERS, OMER IPEK, 19
MAYORE ESTATES, L.L.C., 80 L AFAYETTE A SSOCIATES , L.L.C., S ERKO & S IMON, LLP, 20
C ERTAIN U NDERWRITERS AT LLOYD’S C OMPRISING S YNDICATES NO . 21
33,1003,2003,1208,1243,0376, GREAT L AKES R EINSURANCE (UK) PLC, B ARCLEY 22
D WYER CO., INC., K AROON C APITAL MANAGEMENT, INC., N.S. W INDOWS , LLC, 23
TOWER C OMPUTER S ERVICES , INC., WALL STREET R EALTY C APITAL , INC., MVN 24
A SSOCIATES , INC., MARSHA V AN NAME, FLOYD V AN NAME, D ANIEL D’A QUILA, 25
K OUDIS INTERNATIONAL, INC., A MERICAN A LTERNATIVE INSURANCE 26
C ORPORATION, THE PRINCETON E XCESS & S URPLUS LINES INSURANCE C OMPANY , 27
C ERTAIN U NDERWRITERS AT LLOYD’S LONDON AS MEMBERS OF S YNDICATES 28
NUMBERED 1212, 1241, 79, 506, AND 2791, QBE INTERNATIONAL INSURANCE L TD., 29
INDUSTRIAL R ISK INSURERS , A LLIANZ G LOBAL R ISKS US INSURANCE C OMPANY , 30
A LLIANZ INSURANCE C OMPANY OF C ANADA, A LLIANZ S UISSE V ERSICHERUNGS‐ 31
G ESELLSCHAFT, A LLIANZ V ERSICHERUNGS‐A KTIENGESELLSCHAFT, A SSURANCES 32
G ENERALES D E F RANCE , A SSURANCES G ENERALES DE F RANCI IART, F IREMAN’S 33
F UND INSURANCE C OMPANY , WOBURN INSURANCE , L TD., G REATER NEW Y ORK 34

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MUTUAL INSURANCE C OMPANY, INSURANCE C OMPANY OF G REATER NEW Y ORK, 1
MUNICH‐A MERICAN R ISK PARTNERS , U NDERWRITERS AT L LOYD’S , SUBSCRIBING TO 2
S YNDICATE NO . 1225, AS SUBROGEES OF S ILVERSTEIN PROPERTIES , INC., A MERICAN 3
R E‐INSURANCE C OMPANY , AXA A RT INSURANCE C ORPORATION, AXA C ESSIONS , 4
AXA CORPORATE SOLUTIONS ASSURANCE, AXA CORPORATE SOLUTIONS S ERVICES 5
UK, L TD., AXA CORPORATE SOLUTIONS ASSURANCE C ANADIAN B RANCH , AXA RE, 6
AXA RE MADEIRA B RANCH , AXA R E ASIA PACIFIC PTE. L TD., AXA REINSURANCE 7
UK, PLC, AXA V ERISCHERUNG AG, AXA C ORPORATE S OLUTIONS , C OMPAGNIE 8
G ENERALE D E R EASSURANCE D E MONTE C ARLO , SPS R EASSURANCE, A EGIS 9
INSURANCE S ERVICES, INC., L IBERTY INSURANCE U NDERWRITERS, INC., NATIONAL 10
U NION INSURANCE C OMPANY OF PITTSBURGH , NUCLEAR E LECTRIC INSURANCE 11
L IMITED, CERTAIN U NDERWRITERS AT L LOYDS , (S YNDICATES 1225 AND 1511), AS 12
SUBROGOR OF C ONSOLIDATED E DISON C OMPANY OF NEW Y ORK, INC., MUENCHENER 13
R UECKVERSICHERUNGS‐G ESELLSCHAFT, MUNICH R EINSURANCE C OMPANY UK 14
G ENERAL B RANCH , AXA CORPORATE SOLUTIONS ASSURANCE UK B RANCH , AXA 15
C ORPORATE S OLUTIONS R EINSURANCE C OMPANY , AXA G LOBAL R ISKS UK, L TD., 16
AXA RE CANADIAN B RANCH , CO2 E .COM, LLC, C ANTOR F ITZGERALD & C O ., 17
C ANTOR F ITZGERALD A SSOCIATES , L.P., C ANTOR F ITZGERALD BROKERAGE, L.P., 18
C ANTOR F ITZGERALD E UROPE , CANTOR F ITZGERALD INTERNATIONAL , C ANTOR 19
F ITZGERALD PARTNERS , C ANTOR F ITZGERALD S ECURITIES, C ANTOR F ITZGERALD 20
L.P., C ANTOR INDEX L IMITED, ESPEED, INC., TRADE S PARK, L.P., E S PEED 21
G OVERNMENT S ECURITIES, INC., E S PEED S ECURITIES, INC., C ONSOLIDATED E DISON 22
C OMPANY OF NEW YORK, INC., 2 WORLD TRADE C ENTER LLC, 4 WORLD TRADE 23
C ENTER LLC, MARY B AVIS, MICHAEL K EATING , G ARY MICHAEL LOW , 24
25
Plaintiffs, 26
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‐v.‐ 28
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A MERICAN A IRLINES , INC., AMR C ORPORATION, U NITED A IRLINES , INC., UAL 30
C ORPORATION, MASSACHUSETTS PORT A UTHORITY , C ONTINENTAL A IRLINES, INC., 31
C OLGAN A IR , INC., US AIRWAYS G ROUP , INC., H UNTLEIGH USA CORPORATION, 32
G LOBE A VIATION S ERVICES C ORPORATION, B URNS INTERNATIONAL S ECURITY 33
S ERVICES C ORPORATION, B URNS INTERNATIONAL S ERVICES C ORPORATION, 34
PINKERTON’S INC., S ECURITAS A.B., US AIRWAYS, INC., 35
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Defendants‐Appellees, 1
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E MERY ROTH & PARTNERS L.L.C., E MERY R OTH & SONS , P.C., G LOBE A IRPORT 3
S ECURITY S ERVICES, INC., H UNTLEIGH USA CORPORATION, L ESLIE E. R OBERTSON 4
A SSOCIATES , R.L.L.P., MINORU Y AMASAKI A SSOCIATES , INC., S KILLING WARD 5
MAGNUSSON B ARKSHIRE INC., TISHMAN R EALTY & C ONSTRUCTION C OMPANY , 6
C OLGAN A IRWAYS C ORPORATION, S ILVERSTEIN PROPERTIES, INC., 7 W ORLD TRADE 7
C OMPANY , L.P., C ITIGROUP INC., C ITIGROUP G LOBAL MARKETS HOLDINGS INC., 8
S ALOMON S MITH B ARNEY H OLDING , INC., S ALOMON INC., S WANKE H AYDEN 9
C ONNELL A RCHITECTS , A MBASSADOR C ONSTRUCTION C O ., INC., C OSENTINI 10
A SSOCIATES INC., C ANTOR S EINUK G ROUP , P.C., H.O. PENN MACHINERY CO ., INC., 11
K ABACK ENTERPRISES , PREFERRED U TILITIES MANUFACTURING C ORP ., E LECTRIC 12
POWER SYSTEMS, INC., A MERICAN POWER TECHNOLOGIES, INC., G.C. E NGINEERING 13
& A SSOCIATES, P.C., TISHMAN C ONSTRUCTION C ORPORATION, F IRECOM INC., 14
G RACE CONSTRUCTION PRODUCTS , F IBERLOCK TECHNOLOGIES , INC., R OSEWACH 15
TANK C O ., INC., A LL F IRE SYSTEMS , INC., S YSKA H ENNESSY G ROUP , INC., S KIDMORE 16
O WINGS AND MERRILL , L.L.P., F LACK & K URTZ , INC., ABCO PEERLESS SPRINKLER 17
C ORPORATION, AMEC, PLC, OFFICE OF IRWIN G. C ANTOR, P.C., S ECURITY S ERVICES, 18
INC., C ENTRIFUGAL ASSOCIATES , INC., R IGGS B ANK, N.A., A WHOLY OWNED 19
SUBSIDIARY OF R IGGS NATIONAL C ORPORATION, R IGGS NATIONAL C ORPORATION, 20
IRWIN G. C ANTOR , P.C., JOHNSON C ONTROLS WORLD S ERVICES, INC., TISHMAN 21
C ONSTRUCTION C ORPORATION OF NEW Y ORK, TISHMAN INTERIORS CORPORATION, 22
D ELTA A IRLINES, INC., MIDWAY A IRLINES C ORPORATION, ICTS INTERNATIONAL , 23
N.V., THE B OEING COMPANY , 24
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Defendants. 26
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–––––––––––––––––––––––––––––––––––– 28
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Before: C ABRANES , S TRAUB , and L IVINGSTON, Circuit Judges. 30
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Plaintiffs‐Appellants (“Plaintiffs”), the lessees of 1, 2, 4, 5, and 7 World 32
Trade Center, appeal from a series of orders of the United States District Court 33
for the Southern District of New York (Hellerstein, J.), which culminated in the 34
district court dismissing their case against Defendants‐Appellees (“Defendants”) 35
for negligently maintaining airport security checkpoints on the morning of 36

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September 11, 2001. In brief, the district court determined that Plaintiffs’ 1
insurance proceeds exceeded their maximum possible tort recovery and that, 2
because New York Civil Practice Law and Rules (“CPLR”) § 4545 requires 3
offsetting collateral recoveries against corresponding tort damages, Plaintiffs 4
could not receive a damages award even if they succeeded in proving liability. 5
The district court also held that United Airlines, Inc. and United Continental 6
Holdings, Inc. (collectively, “United”), owed no duty of care to the owner of 7 7
World Trade Center. We conclude that the district court correctly decided that 8
Plaintiffs are entitled only to damages for the diminution in value of their 9
leasehold interests, rather than the cost of rebuilding the leased buildings, and 10
that they may not recover additional damages for retenanting the buildings, 11
paying mortgage carrying costs, hiring attorneys for litigation against their 12
insurers, insurance‐claim preparation expenses, or lost tenant improvements. In 13
addition, we agree with the district court that, pursuant to CPLR § 4545, 14
Plaintiffs’ insurance recoveries correspond to, and therefore must offset, 15
damages for the diminution in value of their leasehold interests. Finally, we also 16
agree that United owed no duty of care to the owner of 7 World Trade Center. 17
Nonetheless, the district court erred in two respects. First, the court used an 18
incorrect valuation methodology when calculating the value by which Plaintiffs’ 19
leasehold interests declined. Second, it wrongly awarded prejudgment interest 20
at the federal funds rate, rather than New York’s statutory prejudgment interest 21
rate. On that issue, we also conclude that the district court should calculate 22
interest on the final tort award. Accordingly, we AFFIRM the district court’s 23
order dismissing the claims brought by 7 World Trade Company against United. 24
We also AFFIRM the district court’s judgment insofar as it properly applied the 25
“lesser of two principle” to limit Plaintiffs’ damages, properly denied Plaintiffs’ 26
claims to consequential damages, and properly applied CPLR § 4545, but we 27
VACATE the judgment in part and REMAND with instructions to assess the lost 28
market value of Plaintiffs’ leasehold interest and, if necessary, to recalculate the 29
award of prejudgment interest in a manner consistent with this opinion. 30
31
Judge S TRAUB concurs in part and dissents in part in a separate opinion. 32
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F OR PLAINTIFFS‐A PPELLANTS: S ETH P. WAXMAN, Randolph D. Moss, 34
Joshua M. Salzman, Wilmer Cutler 35

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Pickering Hale and Dorr LLP, Washington, 1
D.C. 2
3
Richard A. Williamson, Jason T. Cohen, 4
Megan P. Davis, Cathi Baglin, Flemming 5
Zulack Williamson Zauderer LLP, New 6
York, N.Y. 7
8
Michael Gottesman, Carleen M. Zubrzycki, 9
Wilmer Cutler Pickering Hale and Dorr 10
LLP, New York, N.Y. 11
12
F OR D EFENDANTS‐A PPELLEES: R OGER E. PODESTA , Maura K. Monaghan, 13
Erica S. Weisgerber, Johanna N. 14
Skrzypczyk, Debevoise & Plimpton LLP, 15
New York, N.Y. 16
17
Desmond T. Barry Jr., Condon & Forsyth 18
LLP, New York, N.Y. 19
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D EBRA A NN L IVINGSTON, Circuit Judge: 21
This case concerns the tremendous property damage caused by the 22
terrorist attacks of September 11, 2001. Just months before the attacks, in April 23
2001, World Trade Center Properties LLC and affiliated companies (“WTCP”)1 24
obtained 99‐year leases for 1, 2, 4, and 5 World Trade Center (the “Main Site 25
Buildings”) from the Port Authority of New York and New Jersey (“Port 26
1 The affiliated companies that are also Appellants in this case are 1 World Trade Center
L.L.C. and 3 World Trade Center L.L.C.

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Authority”). A separate corporation, 7 World Trade Company, L.P. (“7WTCo.”), 1
held a long‐term lease for 7 World Trade Center, which stood adjacent to the 2
Main Site Buildings. The terrorist attacks destroyed all five of the buildings 3
(collectively, the “Leased Buildings”), leaving WTCP and 7WTCo. (“Plaintiffs”) 4
saddled with significant losses. In March 2005, Plaintiffs brought suit in the 5
United States District Court for the Southern District of New York (Hellerstein, 6
J.) against a group of airlines and security contractors (“Defendants”),2 seeking to 7
recover for these losses. They alleged that, because the Defendants were 8
negligent in overseeing airport security systems, the terrorists were able to hijack 9
American Airlines Flight 11 and United Airlines Flight 175 and to fly those 10
planes into the Twin Towers. 11
After a series of summary judgment decisions and a limited bench trial, 12
Judge Hellerstein, who has presided over these matters with exemplary care and 13
thoughtfulness, entered judgment for Defendants. The court decided that, if 14
Plaintiffs could prove liability, they would be entitled to compensation for the 15
2 Defendants are American Airlines, Inc.; AMR Corporation; United Airlines, Inc.; UAL
Corporation; Massachusetts Port Authority; Continental Airlines, Inc.; Colgan Air, Inc.;
US Airways Group, Inc.; Huntleigh USA Corporation; Globe Aviation Services
Corporation; Burns International Security Services Corporation; Burn International
Services Corporation; Pinkerton’s Inc.; Securitas A.B.; and US Airways, Inc.

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amount of value that their leasehold interests lost due to the attacks, but not for 1
reconstruction costs or other claimed consequential damages related to the cost 2
of retenanting the Leased Buildings, replacing tenant property, hiring attorneys, 3
and paying mortgage carrying costs. The court then found that the value of 4
WTCP’s leasehold interests declined by, at most, $2.805 billion, while the value of 5
7WTCo’s interests fell by $737 million. Both Plaintiffs, however, received 6
insurance payments for their property damage that exceeded those figures and 7
compensated Plaintiffs for the same economic loss as the potential tort award. 8
Because New York Civil Practice Law and Rules § 4545 (“CPLR”) requires courts 9
to reduce damage awards to reflect corresponding insurance payments, the 10
district court concluded that, even if Plaintiffs could prove liability, they could 11
not receive a damages award, and that judgment for Defendants was therefore 12
appropriate. Separately, the district court dismissed 7WTCo.’s claims against 13
United Airlines, Inc. and its parent company, United Continental Holdings, Inc. 14
(collectively, “United”), on the grounds that the airline had no connection to 15
American Airlines Flight 11, which destroyed 7 World Trade Center. 16
On appeal, we agree with the district court’s conclusion that Plaintiffs are 17
entitled to compensation only for the amount of value that their leasehold 18

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interests lost due to the terrorist attacks, that they cannot recover their claimed 1
consequential damages, and that, pursuant to CPLR § 4545, their insurance 2
recoveries correspond to, and offset, their potential tort award. We also agree 3
that United had no duty to supervise the security checkpoints or detect the 4
hijackers who boarded American Airlines Flight 11. 5
However, the district court erred in two respects. First, the court used an 6
incorrect methodology when calculating the value by which Plaintiffs’ leasehold 7
interests declined. Second, it wrongly decided that prejudgment interest accrues 8
at the federal funds rate on the diminution in value of Plaintiffs’ leasehold 9
estates. Instead, the court should have calculated prejudgment interest using 10
New York’s statutory prejudgment interest rate, and assessed that interest based 11
on the final damages award. We therefore vacate in part the district court’s entry 12
of judgment for Defendants — insofar as it miscalculated the diminution in the 13
value of Plaintiffs’ leasehold interest and improperly assessed the prejudgment 14
interest by using the federal funds rate — and remand with instructions as to 15
further proceedings. On remand, the district court should reexamine the 16
diminution in value of Plaintiffs’ leasehold interests in accordance with the 17
guidance provided in this opinion and, if appropriate, calculate interest based on 18

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any resulting award (after accounting for the offset of Plaintiffs’ insurance 1
recoveries) using New York’s statutory prejudgment interest rate. 2
3
BACKGROUND 4
A. Factual Background 5
1. The World Trade Center Leases 6
In 1962, New York and New Jersey enacted legislation authorizing the Port 7
Authority3 to construct an “interurban railway” between the two States and a 8
“facility of commerce” to accommodate “the exchange and buying, selling and 9
transportation of commodities and other property in world trade and 10
commerce.” N.Y. Unconsol. Law § 6601(6)‐(8); see N.J. Stat. § 32:1‐35.50‐32:1‐ 11
35.68. From that legislative command sprung the World Trade Center complex, 12
which upon completion in 1973 “consisted of a 16‐acre public site with a street 13
3 The Port Authority is a joint venture between the States of New York and New Jersey
that was established by an interstate compact in 1921 and authorized by Congress
under Article I, Section 10 of the United States Constitution. Jointly controlled by the
governors of New York and New Jersey, the Port Authority manages significant
portions of the regional transportation infrastructure within the two States, including
bridges, tunnels, airports, and seaports. See Governance, P ORT A UTHORITY OF NEW YORK
AND NEW J ERSEY, http://www.panynj.gov/corporate‐information/governance.html (last
visited July 15, 2015); see also G ROVER STARLING , M ANAGING THE P UBLIC SECTOR 123
(2010); C AROLINE N. BROUN, MICHAEL L. BUENGER , MICHAEL H. MCC ABE , RICHARD L.
MASTERS, T HE EVOLVING U SE AND THE C HANGING R OLE OF I NTERSTATE C OMPACTS: A
P RACTITIONERʹS G UIDE 368 (2006).

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level plaza, a street level and underground shopping mall, a transportation 1
terminal for the New York‐New Jersey PATH trains, a subway hub offering 2
direct access to several [New York City] subway lines, and six [office] buildings, 3
including the ‘Twin Towers’ and the first hotel to open in downtown Manhattan 4
since 1836.” J.A. 548. Five of those buildings — 1, 2, 4, 5, and 7 World Trade 5
Center — provided approximately 12 million square feet of office space. In all, 6
the complex reshaped the City’s skyline and the economy of lower Manhattan. 7
After construction, the Port Authority acted as a landlord for the office 8
space in 1, 2, 4, and 5 World Trade Center, the Main Site Buildings. During that 9
time, it studied the possibility of transferring its role as landlord to a private 10
entity and investigated “comparisons of the World Trade Center with similar 11
private sector operations.” J.A. 377. On January 25, 1996, the Port Authority 12
went further, hiring J.P. Morgan & Co., Cushman & Wakefield, and Douglas 13
Elliman Realty Investors to test the “market reaction” to “three specific options 14
for maximizing the value of the World Trade Center to the Port Authority and to 15
the people of the region”: selling the property, leasing the property, or 16
relinquishing operational control of the property through an asset management 17

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agreement. J.A. 377. Those tests convinced the Port Authority to lease portions 1
of the Main Site Buildings to private operators. 2
The Port Authority began the leasing process by sending a worldwide 3
“request for interest” and then asking 30 of the responding companies for 4
preliminary proposals. The requests generated eight submissions, which the 5
Port Authority narrowed to a “short‐list” of four finalists: Boston Properties, Inc.; 6
Brookfield Financial Properties; Silverstein Properties, Inc. (later, “WTCP”) and 7
Westfield America, Inc.; and Vornado Realty Trust. J.A. 377. These entities were 8
allowed to perform due diligence before submitting bids. 9
On February 22, 2001, the Port Authority entered into an exclusive 10
negotiating period with Vornado Realty Trust for a 99‐year lease on all of the 11
Main Site Buildings. “The value to the Port Authority of Vornado Realty Trust’s 12
proposed net lease transaction, on a present value basis,” was estimated by the 13
Port Authority to be approximately $3.253 billion. J.A. 377. When the 14
negotiations fell apart, the Port Authority turned to the second‐highest bidder, 15
WTCP. The parties signed an “Agreement to Enter Lease” on April 26, 2001 and, 16
on July 16, 2001, WTCP signed 99‐year leases for the Main Site Buildings. 17

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Under the terms of those leases, WTCP obtained the right to manage and 1
sublease approximately ten million square feet of office space, much of which 2
was already occupied by tenants.4 In exchange, it agreed to make an upfront 3
payment of $491.3 million and to pay three forms of rent: basic rent, which 4
increases gradually over the 99‐year lease term; additional, fixed rent for the first 5
30 years of the lease; and a percentage of WTCP’s gross revenue from operating 6
the premises. It also undertook non‐rent obligations, the most significant of 7
which was the promise that, in the event that the Main Site Buildings were 8
destroyed or damaged, WTCP would “rebuild, restore, repair and replace [them] 9
. . . to the extent feasible, prudent and commercially reasonable.” J.A. 461. In 10
addition, it promised to pay for maintenance, operational costs, and tax 11
equivalents, and to purchase sizable insurance policies. WTCP announced the 12
acquisition in a brochure to investors, identifying the present value of the overall 13
“purchase price” to be $2.844 billion. 5 J.A. 524. 14
4 WTCP’s partner, Westfield America, Inc., took control of the retail mall at the World
Trade Center complex. Because Westfield America is not an appellant, this opinion will
not address portions of the lease agreement that pertain to the retail mall.
5 The brochure also notes that the lease for the retail mall cost $395 million, amounting
to an overall purchase price of $3.239 billion. This figure is similar to the Port
Authority’s evaluation of the proposal, which valued WTCP and Westfield America’s
bid at $3.211 billion in present‐value terms.

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Unlike the Main Site Buildings, 7 World Trade Center was privately 1
managed and operated even before its construction. In 1980, the Port Authority 2
hired 7WTCo. to design, erect, and equip an office building adjacent to the Main 3
Site of the World Trade Center complex. 7WTCo. completed the project, which 4
came to be known as 7 World Trade Center, in 1987, at which point it signed a 5
99‐year lease with the Port Authority to manage the property. Like WTCP, 6
7WTCo. agreed to pay rent, tax equivalents, and operational expenses, to 7
purchase insurance, and to “rebuild, restore, repair and replace” the building “at 8
its sole cost and expense” in the event of its destruction. J.A. 943‐49. 9
2. The Destruction of the Leased Buildings 10
On the morning of September 11, 2001, Mohamed Atta, “[t]he operational 11
leader of the 9/11 conspiracy,” J.A. 373, and an accomplice passed through 12
airport security in Portland, Maine, and took US Airways/Colgan Flight 5930 to 13
Boston Logan International Airport. J.A. 359. Upon arriving at Logan, they 14
joined three co‐conspirators and passed through a security checkpoint run by 15
American Airlines before boarding American Airlines Flight 11. Five other 16
terrorists began their attack in Boston, entering the boarding area through a 17
United Airlines security checkpoint at Logan Airport and then boarding United 18

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Airlines Flight 175. The first group hijacked Flight 11 and crashed the plane into 1
1 World Trade Center. Soon after, the second group used Flight 175 to destroy 2 2
World Trade Center. By the late afternoon, falling debris and fires had destroyed 3
the other Main Site Buildings and 7 World Trade Center, and had damaged large 4
portions of lower Manhattan. 5
The September 11th attacks were a financial catastrophe for Plaintiffs. 6
According to WTCP and 7WTCo., their leases required them to continue paying 7
rent to the Port Authority notwithstanding the lack of income from tenants, and 8
to reconstruct the Leased Buildings. Plaintiffs also claim that the attacks forced 9
them to bear additional expenses, including the cost of pursuing insurance 10
claims, replacing tenant improvements, retenanting the buildings, and paying 11
mortgage carrying costs. 12
To guard against these types of losses, WTCP and 7WTCo. had obtained 13
extensive insurance policies on their leasehold interests, which insured them for 14
damage caused by terrorist attacks. WTCP’s policy involved over two dozen 15
insurers and insured the company “for business interruption (lost [rental 16
payments]) and the replacement costs of the buildings if damaged or destroyed, 17
up to $3.5468 billion per [covered] occurrence.” S.P.A. 79. 7WTCo. obtained a 18

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similar, but smaller, policy from Industrial Risk Insurers (“IRI”), which covered 1
business interruption losses and rebuilding costs up to $860 million per covered 2
occurrence. S.P.A. 79. The replacement cost coverage was designed to protect 3
Plaintiffs against physical damage to their property — and did not require that 4
they actually repair or rebuild the Leased Buildings in order to receive insurance 5
payments — while the business interruption coverage was intended to 6
indemnify Plaintiffs for any loss of income that occurred while the leased 7
buildings were damaged or destroyed. 8
Both Plaintiffs filed insurance claims shortly after the September 11th 9
attacks. WTCP submitted proofs of loss seeking $8.531 billion from its insurers. 10
These proofs of loss allocated roughly $7.183 billion to replacement costs for the 11
Main Site Buildings and $1.348 billion to business interruption losses. WTCP 12
also identified damages “other than destruction of real property and business 13
interruption,” but never quantified those claims. J.A. 1010. While three insurers 14
paid their portion of the claims promptly, the rest argued that the September 15
11th attacks were one “occurrence” under their policies, so WTCP’s recovery 16

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could not exceed $3.5468 billion. 6 WTCP sued the recalcitrant insurers in the 1
United States District Court for the Southern District of New York, see SR Int’l 2
Bus. Ins. Co. v. World Trade Ctr. Props., LLC, 467 F.3d 107 (2d Cir. 2006), and the 3
parties ultimately settled, with the insurers agreeing to pay WTCP 4
approximately $4.1 billion. The settlement involved a general release of all of 5
WTCP’s claims against the insurers and did not allocate the settlement proceeds 6
among WTCP’s claimed losses. 7
Separately, 7WTCo. submitted proofs of loss seeking $1.497 billion from 8
IRI, with roughly $1.053 billion allocated to replacement costs, $442 million for 9
business interruption, and $2 million for personal property. Like WTCP’s claims, 10
7WTCo.’s submission exceeded its $860 million per‐occurrence policy limit, and 11
IRI initially balked at paying the entire claim. 7WTCo. filed suit, and IRI 12
eventually agreed to pay approximately $831 million in exchange for a general 13
release of all claims. Once again, the settlement did not allocate the proceeds of 14
the payment between 7WTCo.’s claimed losses. 15
16
6 Even if the attacks constituted two “occurrences,” WTCP’s replacement cost and
business interruption claims exceeded its maximum possible insurance recovery, which
is known as a “policy limits loss.” J.A. 987.

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B. Procedural History 1
In 2004, Plaintiffs sued a group of airlines and airport security contractors 2
in the district court, claiming that their negligent maintenance of airport security 3
checkpoints in Boston and Portland allowed the terrorists to board and hijack the 4
planes that destroyed the Leased Buildings. Plaintiffs’ claims arise under the Air 5
Transportation Safety and System Stabilization Act of 2001 (“ATSSSA”), Pub. L. 6
No. 107‐42, 115 Stat. 230 (codified as amended at 49 U.S.C. § 40101), which 7
creates an exclusive “Federal cause of action for damages arising out of the 8
hijacking and subsequent crashes of American Airlines flights 11 and 77, and 9
United Airlines flights 93 and 185, on September 11, 2001.” ATSSSA § 408(b)(1). 10
Under the Act, “[t]he substantive law for decision in any such suit shall be 11
derived from the law, including choice of law principles, of the State in which the 12
crash occurred unless such law is inconsistent with or preempted by Federal 13
law.” Id. § 408(b)(2). The parties agree that, in this case, the substantive law is 14
derived from the law of New York. Appellants’ Br. at 41; Appellees’ Br. at 82. 15
After extensive discovery, Defendants moved for summary judgment on 16
WTCP’s claims. They focused on damages, rather than the merits of the 17
negligence claim, arguing that: (1) WTCP is entitled to compensation for the 18

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amount of value that their leasehold interests lost due to the attacks, and not for 1
replacement costs or other consequential damages; (2) the diminution in the fair 2
market value of the Main Site Leases was $2.805 billion — the present value of 3
the rent that WTCP agreed to pay for those leases; and (3) that, pursuant to CPLR 4
§ 4545, any tort award WTCP could receive must be reduced by the amount of its 5
insurance recovery. 6
WTCP countered that using the lost market value of its leasehold interests 7
to calculate damages results in insufficient compensation, that the decline in the 8
value of its leaseholds exceeded $2.805 billion, and that CPLR § 4545 does not 9
require an offset for its insurance recoveries. In support, it offered declarations 10
from expert witnesses. Sheldon Gottlieb, an expert in real estate appraisal, 11
testified that the market value of WTCP’s leaseholds does not reflect the 12
immense public benefits that the World Trade Center complex provided. He 13
added that, in any event, $2.805 billion is simply the amount of rent that WTCP 14
agreed to pay, which is not equivalent to the decline in the value of the WTCP’s 15
leasehold interests because it ignores the profits WTCP expected to earn, the 16
value of non‐rent obligations that WTCP assumed, and the post‐attack costs that 17
WTCP was forced to bear, which resulted in the leases having a negative value 18

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after September 11, 2001. Professor Kerry D. Vandell, an expert in real estate 1
finance, echoed Gottlieb’s opinion that $2.805 billion is the amount of rent that 2
WTCP agreed to pay, not the amount by which the value of its leasehold interest 3
declined. Vandell explained that ascertaining the correct change in value 4
requires comparing the value of WTCP’s leasehold interests before and after the 5
attacks. 6
On December 11, 2008, the district court granted Defendants’ motion in 7
part and denied it in part. The court noted that New York follows the “lesser of 8
two” rule, under which “a plaintiff whose property has been injured may recover 9
the lesser of the diminution of the property’s market value or its replacement 10
cost.” S.P.A. 10. It then concluded that the diminution in market value is the 11
appropriate measure of compensation, rejecting the arguments that, because of 12
the public purpose of the Main Site Buildings and WTCP’s contractual obligation 13
to rebuild, replacement costs are the proper measure of damages. The court, 14
however, refused to conclude that the value of WTCP’s leasehold interest 15
declined by $2.805 billion. Although WTCP agreed to pay that sum to obtain the 16
leases in April 2001, “market values can fluctuate rapidly” and “the value of 17
property privately owned and managed by an experienced real estate developer 18

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20
may enjoy a different market value than property owned and managed by a 1
governmental bureaucracy.” S.P.A. 21. As a result, the court temporarily denied 2
summary judgment to provide WTCP an opportunity to show that the value of 3
the Main Site Leases changed between April and September 2001. The court also 4
concluded that there was insufficient evidence to decide the CPLR § 4545 issue, 5
and therefore denied summary judgment without prejudice. 6
In response to the summary judgment decision, WTCP submitted an 7
additional declaration from Professor Vandell. In this declaration, Vandell 8
reiterated that the diminution in the value of WTCP’s leasehold should be 9
calculated by measuring the “difference between the fair market value of [its] 10
interests immediately before and immediately after” September 11, 2001. J.A. 11
632. Fair market value is the amount “an investor or third party would be 12
willing to pay for an assignment of” the Main Site Leases, and can be calculated 13
by comparing the present value of the expected revenues and expenses 14
associated with owning those leases. Id. Because expected costs can equal or 15
exceed expected revenues, the value of a leasehold interest can be zero or 16
negative. Vandell then evaluated the diminution in market value of WTCP’s 17
leasehold interest, concluding that the leasehold had a market value of $1.459 18

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billion immediately before the attacks and negative $5.333 billion immediately 1
afterwards. His calculations included WTCP’s expected profits from operating 2
the Main Site Buildings and the costs associated with reconstruction. In all, the 3
diminution in market value added up to $6.792 billion. 4
The district court considered these arguments and, on April 30, 2009, 5
rejected them. The court characterized WTCP’s submission as an attempt to 6
correct perceived errors in the original summary judgment decision and viewed 7
the argument that the Main Site Leases had negative value after the attacks as a 8
new attempt to recover reconstruction costs. It therefore decided that any 9
recovery by WTCP against Defendants for the Main Site Leases “shall not exceed 10
$2.805 billion.” S.P.A. 30. Several months later, on September 30, 2009, the 11
district court also granted Defendants summary judgment on WTCP’s claims for 12
the cost of retenanting the Main Site Buildings, replacing tenant improvements, 13
and paying attorneys’ fees during the insurance litigation, thereby capping 14
WTCP’s possible damages at $2.805 billion. 15
The 7WTCo. litigation followed a similar path. First, United moved for 16
summary judgment on the grounds that it was not responsible for the security 17
checkpoints that the terrorists used before hijacking American Airlines Flight 11, 18

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which destroyed 7WTCo. The remaining Defendants then filed a separate 1
summary judgment motion, arguing that 7WTCo. can recover only the 2
diminution in value of its leasehold interest and that, pursuant to CPLR § 4545, 3
its damages award must be reduced by the amount of its insurance recovery. 4
On November 21, 2012, the district court granted summary judgment to 5
United, concluding that there was no evidence that it had a “connection to Flight 6
11 or its hijackers,” S.P.A. 56, and therefore that it “did not owe 7WTCo. a duty 7
of care,” S.P.A. 58. The court resolved the second summary judgment motion in 8
an order issued on December 5, 2012. As in WTCP’s case, the district court 9
concluded that 7WTCo. is entitled to compensation for the amount of value that 10
their leasehold interests lost due to the attacks, but not for reconstruction costs or 11
other claimed consequential damages. For 7WTCo., that diminution in value 12
was, at most, $737 million, a figure that the district court drew from Vandell’s 13
assessment of the pre‐attack value of 7WTCo.’s leasehold interest.7 Also as in 14
WTCP’s case, the district court rejected 7WTCo.’s claims to recover for the cost of 15
retenanting the building, lost tenant improvements, attorneys’ fees incurred 16
7 Vandell’s report for 7WTCo. argued that the pre‐attack value of its leasehold interest
was $737 million and that the post‐attack value was negative $222 million. Once again,
the post‐attack leasehold valuation included the cost of reconstructing the destroyed
building.

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during litigation with IRI, and mortgage carrying costs.8 Finally, the district 1
court denied summary judgment to the Defendants on the argument that 2
7WTCo.’s potential tort award must be reduced by its insurance recovery. 3
After establishing WTCP’s and 7WTCo.’s maximum recoverable damages, 4
the district court chose to conduct a bench trial to determine whether, under 5
CPLR § 4545, any tort award Plaintiffs receive would need to be reduced by the 6
value of their insurance recoveries. Over the course of a five‐day trial held in 7
July 2013, the district court heard testimony about the proper way to allocate the 8
insurance recoveries between the different types of insurance claims Plaintiffs 9
submitted, and heard the opinions of two economists — Professor Steven Shavell 10
for the Plaintiffs and Professor Daniel Fischel for the Defendants — about 11
whether a potential tort award would compensate Plaintiffs for the same type of 12
losses that their insurance recoveries remedied. 13
In an order issued from the bench and then supplemented by a written 14
opinion, the district court ruled for the Defendants. It concluded that, after 15
accounting for fees and insurance premiums, WTCP recovered $4.044 billion 16
from its insurers and 7WTCo. recovered $829 million. These payments 17
8 The district court granted 7WTCo.’s claims to recover lost personal property, but the
company settled these claims with Defendants before this appeal.

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compensated Plaintiffs for the cost of replacing the leased buildings and “for 1
business interruption, i.e., the cost of rental payments that sub‐lessees . . . failed 2
to pay . . . as a result of the buildings’ destruction.” S.P.A. 81. The court then 3
determined that these categories of insurance recovery “correspond[] completely 4
to Plaintiffs’ potential tort recoveries related to the lost value of their leaseholds, 5
and that the insurance recoveries should be set off against such potential tort 6
recoveries, reducing them to zero.” S.P.A. 86. Accordingly, the district court 7
entered judgment for Defendants. 8
DISCUSSION 9
On appeal, Plaintiffs contend that the district court erred at each step in the 10
series of orders that culminated in its decision to dismiss their claims. We review 11
the district court’s grants of summary judgment and its legal conclusions de novo, 12
construing all facts in favor of the nonmoving party. Shakhnes v. Berlin, 689 F.3d 13
244, 250 (2d Cir. 2012). As for the bench trial, we review the district court’s 14
findings of facts for clear error, and its conclusions of law de novo. CARCO 15
GROUP, Inc. v. Maconachy, 718 F.3d 72, 79 (2d Cir. 2013) (per curiam). 16
17
18

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A. Damages 1
Our analysis begins with the calculation of Plaintiffs’ maximum 2
recoverable damages. After a series of summary judgment decisions, the district 3
court determined that, if WTCP and 7WTCo. could prove that Defendants are 4
liable for the destruction of the World Trade Center Complex, the companies 5
could recover, at most, $2.805 billion and $737 million, respectively. In arriving 6
at this decision, the district court concluded that Plaintiffs are entitled only to the 7
amount of value that their leasehold interests lost due to the attacks, not 8
reconstruction costs, and that Plaintiffs cannot recover for the costs associated 9
with retenanting the Leased Buildings, lost tenant improvements, paying 10
mortgage carrying costs, or hiring attorneys for the litigation against the insurers. 11
We agree with these conclusions, and therefore affirm in substantial part the 12
orders in which the district court announced them.9 The district court, however, 13
relied on an incorrect method of measuring the market value of leasehold estates. 14
Accordingly, we vacate the portions of the August 30, 2009 and December 5, 2012 15
orders establishing the diminution in value of Plaintiffs’ leasehold interests, and 16
9 The district court limited Plaintiffs’ recoveries to diminution in market value in its
December 11, 2008, and December 5, 2012 orders. It denied their claims for tenanting,
mortgage carrying costs, and attorneys’ fees in orders issued on September 30, 2009,
and December 5, 2012.

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remand to the district court to reassess these calculations in light of the guidance 1
in this opinion. 2
1. Reconstruction Costs 3
Under New York law, which provides the substantive law governing 4
Plaintiffs’ ATSSSA claims, “an award of damages to a person injured by the 5
negligence of another” is designed “to restore the injured party, to the extent 6
possible, to the position that would have been occupied had the wrong not 7
occurred.” McDougald v. Garber, 73 N.Y.2d 246, 253‐54 (1989). When negligence 8
results in the permanent destruction of real property, damages can “place the 9
wronged victim in the same position as it was prior to the wrongdoing,” 36 N.Y. 10
Jur. 2d Damages § 6, in one of two ways. One possibility is to award the plaintiff 11
“the difference between the value of the land before the injury and its value after 12
the injury . . . sometimes called the ‘diminution‐in‐value rule.’” 36 N.Y. Jur. 2d 13
Damages § 75; see also Fisher v. Qualico Contracting Corp., 98 N.Y.2d 534, 539 (2002). 14
The other is to award “the cost of restoration,” Scribner v. Summers, 138 F.3d 471, 15
472 (2d Cir. 1998) (per curiam), plus the “reasonable worth” of the property’s use 16
while the plaintiff “is deprived of” the property, 36 N.Y. Jur. 2d Damages § 113. 17

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While these two measures of damages — the decline in market value and 1
the cost of restoration — compensate a plaintiff for the same injury, they can 2
produce awards of different sizes. As a result, the New York Court of Appeals 3
has instructed that, in general, “the proper measure of damages for permanent 4
injury to real property is the lesser of the decline in market value and the cost of 5
restoration.” Jenkins v. Etlinger, 55 N.Y.2d 35, 39 (1982); see also Hartshorn v. 6
Chaddock, 135 N.Y. 116, 122 (1892). This “lesser of two” principle reflects the 7
judgment that, in most cases, both measures of damages are capable of 8
“affording full compensation” for lost property — as the Court of Appeals put it, 9
they are “two sides of the same coin.” Fisher, 98 N.Y.2d at 540. Quite simply, 10
when property is damaged, the value of owning that property falls. The value 11
can be returned to the owner by paying an amount of money equivalent to the 12
loss in value or by providing funds to restore the property to its original state. 13
Id.; see also Dobbs, Law of Remedies § 5.2(3) at 722 (2d ed. 1993) (“The reason for 14
using diminished value as a ceiling on repair costs is clear; diminished value 15
represents the full amount of economic loss of a landowner . . . .”). Allowing the 16
plaintiff to recover the higher measure of damages, then, would force the 17
defendant to bear a greater cost than is necessary to rectify the harm it caused. 18

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In its December 11, 2008 and December 5, 2012 orders, the district court 1
concluded that this “lesser of two” principle limits Plaintiffs’ recoverable 2
damages to the diminution in market value of their leasehold interests and 3
prevents them from recovering reconstruction costs. We agree.10 4
New York courts have applied the “lesser of two” principle across a broad 5
spectrum of possessory interests, including fee simple interests in both 6
residential and commercial property. See, e.g., Fisher, 98 N.Y.2d at 536 7
(residential property); Hartshorn, 135 N.Y. at 122 (farm); Prashant Enters. Inc. v. 8
New York, 650 N.Y.S.2d 473, 476 (3d Dep’t 1996) (motel); see also Scribner, 138 F.3d 9
at 472 (family business and rental property). The compensatory principles that 10
animate these decisions apply no differently in the context of leasehold interests 11
like those of the Plaintiffs in the Leased Buildings. A commercial lease entitles 12
the lessee to use all or part of a property for a specified period of time, in 13
exchange for rent and other consideration. This interest is distinct from the 14
original fee simple interest and the lessor’s leased fee estate, and has its own 15
10 Plaintiffs characterize the district court’s decision as concluding that Defendants’
purported negligence was not the proximate cause of Plaintiffs’ obligation to rebuild.
We need not, and do not, address whether this is a proper characterization of the
district court’s decision. Instead, our conclusion that the “lesser of two” rule limits
Plaintiffs’ damages to the diminution in market value of their leasehold interests
renders the proximate cause issue irrelevant to resolving this case.

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29
market value — namely, the amount that a buyer would be willing to pay for the 1
right to assume the lessee’s rights and obligations. See Great Atl. & Pac. Tea Co. v. 2
New York, 22 N.Y.2d 75, 84 (1968); Appraisal Inst., The Appraisal of Real Estate 83 3
(12th ed. 2001). If a portion of the property covered by the leasehold interest is 4
destroyed or damaged, the value of the leasehold interest falls because the 5
bundle of rights to which the owner of that interest is entitled becomes less 6
valuable. See, e.g., James R. MacCrate, The Valuation of Leasehold Interests, Real 7
Estate Appraisal and Valuation Issues (June 2, 2010), 8
https://realestatevaluation.wordpress.com/2010/06/02/the‐valuation‐of‐leasehold‐ 9
interests/; Jeffrey D. Fisher & Robert S. Martin, Income Property Appraisal 189 10
(1991). An award can therefore place the lessee in the “same position as it was 11
prior to the wrongdoing,” 36 N.Y. Jur. 2d Damages § 6, either by providing the 12
monetary equivalent of the lost value or by presenting the plaintiff with 13
sufficient funds to repair the damages and weather the reconstruction period, 14
thereby restoring the original value of the rights under the lease. Cf. Great Atl. & 15
Pac. Tea Co., 22 N.Y.2d at 84 (“The damages to which a lessee is entitled are 16
generally the value of the leasehold.”). 17

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30
Of course, leasehold interests involve a different set of rights and 1
obligations than fee simple ownership. But these are differences of degree, not of 2
kind. For instance, a lessee, unlike a fee simple owner, often has an obligation to 3
pay rent that continues even after the property covered by the lease is destroyed. 4
In fact, both WTCP and 7WTCo.’s leases contain such a covenant. This 5
continuing obligation, however, means only that the value of the leasehold 6
interest after the destructive event must take into account the lessee’s obligation 7
to make future rental payments. Professor Vandell, Plaintiffs’ expert on 8
damages, agrees, and attributes a negative market value to Plaintiffs’ leases after 9
the attacks to account for the obligation to pay rent. This method of calculating 10
diminution in market value differs from the calculation that a court would 11
perform in the context of fee simple ownership, but that does not alter the 12
principle that diminution in value, properly ascertained, can adequately 13
compensate a commercial lessee. 14
WTCP and 7WTCo. counter that their leases also differ from fee simple 15
ownership because they are obligated to reconstruct the Leased Buildings.11 That 16
11 Defendants challenge Plaintiffs’ characterization of the requirement to rebuild the
Leased Buildings. Appellees’ Br. at 55‐62. Their argument centers on the clause in the
lease that requires Plaintiffs to “rebuild, restore, repair, and replace” the Buildings, but
only “to the extent feasible, prudent and commercially reasonable.” Id. at 56. Because

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31
obligation does not, however, entitle them to the reconstruction cost measure of 1
damages. Although property owners are often “not legally obligated” to 2
reconstruct damaged property, “economic circumstances often force them to do 3
so”; “[w]hen a home is condemned, for example, its owner must find another 4
place to live.” United States v. 50 Acres of Land, 469 U.S. 24, 34 (1984). 5
Nonetheless, New York courts have not considered a plaintiff’s decision to repair 6
property, standing alone, to be a sufficient justification for awarding replacement 7
costs that exceed diminution in market value. See, e.g., Fisher, 98 N.Y.2d at 534‐40 8
(limiting plaintiffs’ recovery to diminution in market value notwithstanding fact 9
that plaintiff had already rebuilt property); cf. Application of City of N.Y., 680 10
N.Y.S.2d 533, 535‐36 (1st Dep’t 1998) (noting that, in the takings context, 11
replacing condemned property is not sufficient to justify compensation in excess 12
of market value). Compensatory damages, after all, “serve to make good, so far 13
as it is possible to do so in dollars and cents, the harm done by a wrongdoer,” 14
which is, at most, what the plaintiff lost, not what the plaintiff later purchased, 15
even if they were required to do so. Lopez v. Adams, 895 N.Y.S.2d 532, 538 (3d 16
Dep’t 2010); see Dobbs, supra § 5.2(3) at 722. Replacing a property may cost more 17
we conclude that the purported covenant to rebuild does not alter Plaintiffs’ potential
tort recoveries, we need not decide whether this lease provision constitutes an
unconditional obligation to rebuild.

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32
than the pre‐destruction value, “but the new [property] itself will be more 1
valuable and last longer.” 50 Acres of Land, 469 U.S. at 34 n.21 (quoting United 2
States v. 564.54 Acres of Land, 441 U.S. 506, 518 (1979) (White, J., concurring)). 3
Plaintiffs’ covenants to rebuild the Leased Buildings, then, may require 4
them to devote funds to reconstruction, but do not alter the measure of their 5
potential tort recoveries. Just as a landowner may have a strong economic 6
interest in rebuilding property, a lessor and lessee may wish to ensure that the 7
leased property is rebuilt in the event of destruction. Covenants to repair 8
accomplish that goal by allocating the risk of loss between the two parties. They 9
do not, however, magnify the value of the damage from the property destruction 10
or put the party who has assumed the obligation to rebuild in any worse position 11
than a landowner who, for economic reasons, is forced to rebuild in the absence 12
of a contract. As a result, WTCP and 7WTCo., and similarly situated lessees, 13
should not receive a higher measure of damages than the landowner could have 14
recovered without the contract simply because dividing the interest in land 15
required agreeing, in advance, on how to handle possible damage to the 16
property. Cf. 50 Acres of Land, 469 U.S. at 34‐35 (concluding that, in the context of 17
just compensation, a plaintiff’s “legal obligation” to replace a condemned facility 18

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33
does not justify a different measure of damages than a party without such an 1
obligation would receive). To hold otherwise would be inconsistent with New 2
York courts’ reluctance to consider landowners’ decisions to rebuild when 3
selecting the measure of damages, see Fisher, 98 N.Y.2d at 534‐40, and the general 4
principle that, when property is destroyed or condemned, a lessee is entitled to 5
no more for that loss than the unencumbered value of the fee interest, see Great 6
Atl. & Pac. Tea Co., 22 N.Y.2d at 84. 7
As an alternative, WTCP and 7WTCo. argue that, in this particular case, 8
diminution of value is an inadequate measure of damages because it does not 9
account for the property’s “unique public benefit” — namely, the promotion of 10
economic development in lower Manhattan and northern New Jersey — or its 11
“iconic status.” Appellants’ Br. at 61‐65. In support, they rely on the testimony 12
of their expert witnesses, and contend that a jury should have considered their 13
entitlement to replacement costs. Cf. Jenkins, 55 N.Y.2d at 39 (requiring 14
defendant to prove that the lesser measure of damages “will sufficiently 15
compensate for the loss”). 16
We find these arguments unpersuasive. We recognize that, in the context 17
of just compensation for takings, New York courts have noted that, although 18

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34
ordinarily “the fair equivalent of the actual loss sustained” by a property’s owner 1
is the property’s market value, some property “is of a kind seldom traded, [such 2
that] it lacks a ‘market price’” and therefore must be compensated for according 3
to its replacement cost. Matter of Rochester Urban Renewal Agency, 45 N.Y.2d 1, 8‐9 4
(1978). But this class of “specialty” property is narrow; “reproduction cost 5
should be utilized only in those limited instances in which no other method of 6
valuation will yield a legally and economically realistic value for the property.” 7
Great Atl. & Pac. Tea Co. v. Kiernan, 42 N.Y.2d 236, 242 (1977). Accordingly, New 8
York courts have awarded replacement costs only when the property at issue is 9
“specially built” for a “specific purpose” and a “special use,” there is “no market 10
for the type of property . . . and no sales of property for such use,” and the 11
property’s use is “economically feasible and reasonably expected to be replaced.” 12
Application of City of N.Y., 680 N.Y.S.2d at 535‐36 (quoting Matter of Cnty. of 13
Nassau, 349 N.Y.S.2d 422, 427 (2d Dep’t 1973)); see Matter of Saratoga Harness 14
Racing v. Williams, 91 N.Y.2d 639, 645‐46 (1998). “Churches, hospitals, 15
clubhouses and like structures . . . commonly fall within this category” because 16
the building “may be regarded by the organization that owns and utilizes it as 17
worth everything it cost to construct and more, yet it may not be ‘marketable’ 18

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35
because no similar group would have sufficient need for the property to be 1
willing to purchase it.” Rochester Urban Renewal Agency, 45 N.Y.2d at 9. 2
In light of this standard, there is no genuine dispute of material fact about 3
whether diminution in market value is an adequate measure of damages. At the 4
start, 7WTCo. has presented no evidence that 7 World Trade Center is 5
sufficiently unique, or served such a significant public purpose, to warrant a 6
recovery in excess of lost market value. In fact, Professor Kerry Vandell, the only 7
expert to submit a report about the property, calculated the change in market 8
value to 7WTCo.’s leasehold interest by comparing the expected income streams 9
before and after the September 11th attacks. 10
As for WTCP, Defendants’ submissions conclusively establish that the 11
company’s interest in the Main Site Buildings was not “specialty” property for 12
which reproduction cost is the only appropriate measure of damages. WTCP’s 13
property interest consists of 99‐year leases to five commercial office buildings, 14
with the reversionary interest held by the Port Authority. Far from there being 15
“no market for [this] type of property,” Saratoga Harness Racing, 91 N.Y.2d at 645, 16
WTCP procured its leasehold interests through what Charles Gargano from the 17
Port Authority called a “worldwide . . . competitive bidding process,” J.A. 594. 18

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36
Michael Levy, from WTCP, agreed that the bidding was “extensive” and 1
“competitive” because the buildings were “trophy” properties. J.A. 598‐99. 2
After obtaining the leases, moreover, WTCP operated its Leased Buildings as a 3
landlord, subleasing portions of the property to commercial tenants. This was 4
not a “special use.” Application of City of N.Y., 680 N.Y.S.2d at 535‐36; see also 5
Heidorf v. Town of Northumberland, 985 F. Supp. 250, 262 n.6 (N.D.N.Y. 1997) 6
(distinguishing between a building’s historic “status” and the uniqueness of the 7
“use” to which it is put). Quite to the contrary, WTCP’s leases required the 8
company to “operate and maintain” the properties as “office building[s] . . . in a 9
manner generally consistent with other office buildings located within the 10
Borough of Manhattan,” and included a list of comparable buildings in the area. 11
J.A. 414.12 12
12 Even if, as Plaintiffs claim, no buildings are precisely comparable to the Main Site
Buildings, it does not mean that the leases for those buildings lacked a market value.
Assessing comparable leases is only one way to value a leasehold interest, and other
methods — most notably the capitalization of income approach — are equally valid.
See Allied Corp. v. Town of Camillus, 80 N.Y.2d 351, 356 (1992) (“[E]vidence of comparable
sales is generally the preferred measure of a property’s value . . . , but where there is
insufficient relevant data, value may be determined by other methods.”); Gordon v.
Town of Esopus, 745 N.Y.S.2d 334, 335 (3d Dep’t 2002) (accepting an “income valuation
method” when the property was “income producing” and “unique to the extent that no
comparable properties exist”); see also Saratoga Harness Racing, 91 N.Y.2d at 643. Indeed,
“even when alternative theories must be used” courts have shied away from using a
“reproduction cost” methodology except for the narrow class of “properties deemed
‘specialties.’” Allied Corp., 80 N.Y.2d at 356‐57.

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37
Nor is WTCP’s claim for replacement costs supported by the World Trade 1
Center Complex’s public purpose. WTCP’s experts attest to the “public 2
purpose” that the World Trade Center Complex serves, noting that it 3
reinvigorated the economic life of lower Manhattan and Northern New Jersey. 4
But WTCP did not lease the entire World Trade Center Complex; its leasehold 5
interest encompassed only the office space in the Main Site Buildings. As 6
Sheldon Gottlieb, WTCP’s appraisal expert, explained: “[t]he Port Authority 7
never leased the non‐commercial, public purpose, and public benefit part of the 8
properties or their operation to WTCP.” J.A. 565 n.4. More fundamentally, in 9
evaluating just compensation, the Supreme Court has refused to compensate 10
private plaintiffs for the community value of their properties. See 564.54 Acres of 11
Land, 441 U.S. at 516. The Court’s rationale readily applies in the context of tort 12
damages. “The community benefit” a property confers “might provide an 13
indication of the public’s loss,” but compensatory damages seek to ensure that 14
the “owner” of the property is “made whole.” Id. WTCP “did not hold” its 15
leasehold interests “as the public’s trustee and thus is not entitled to be 16
indemnified for the public’s loss.” Id.; see N.Y. Unconsol. Law § 6610 (entrusting 17

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38
the Port Authority with “undertaking . . . [t]he effectuation of the world trade 1
center”).13 2
Critically, our conclusion that WTCP and 7WTCo. are not entitled to 3
replacement costs by no means minimizes the importance of the World Trade 4
Center Complex to New York and New Jersey or the country’s interest in seeing 5
the site rebuilt. Compensatory damages are not designed, and courts 6
adjudicating civil claims are not well suited, to heal a region’s and a nation’s 7
wounds. Rather, we simply conclude, agreeing with the district court, that 8
Plaintiffs’ leases for the office space at 1, 2, 4, 5, and 7 World Trade Center can be 9
valued according to market metrics, and that Plaintiffs can therefore be 10
compensated by the diminution in the market value of those leasehold interests. 11
Plaintiffs (assuming liability is established) are entitled to compensation for the 12
amount of value that their leasehold interests lost due to the attacks, but not to 13
reconstruction costs. 14
15
16
13 Although Defendants devote a significant portion of their briefing to the argument
that the Port Authority’s decision to issue 99‐year leases “privatized” the Leased
Buildings, we fail to see how this label alters the damages analysis.

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2. Consequential Damages 1
In addition to reconstruction costs, WTCP and 7WTCo. also seek 2
consequential damages. Specifically, Plaintiffs argue that they are entitled to 3
recover for the cost of retenanting the Leased Buildings, hiring attorneys during 4
litigation with their insurers, paying mortgage carrying costs, and losing tenant 5
improvements. The district court denied these claims for consequential damages 6
in orders issued on September 30, 2009 and December 5, 2012. We agree, and 7
address each decision in turn. 8
The decision to deny damages for retenanting costs and lost tenant 9
improvements flows naturally from the conclusion that diminution in market 10
value, rather than replacement cost, is the correct measure of damages. Before 11
the terrorist attacks, the Leased Buildings were fully tenanted. The difference in 12
value of Plaintiffs’ leasehold interest before and after September 11, 2001, then, 13
includes the loss of those tenants and any improvements they made to the 14
premises. Put differently, the diminution‐in‐value measure of damages already 15
compensates Plaintiffs for the fact that they lost tenanted buildings complete 16
with tenant improvements. Viewed in this light, Plaintiffs’ claims for the cost of 17
retenanting the Leased Buildings and replacing tenant improvements are 18

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40
nothing more than attempts to recover the cost of restoring the Leased Buildings 1
to the state in which they existed before the attack — the “reconstruction cost” 2
measure of damages for these elements of the leasehold interests. Awarding 3
these costs would therefore compensate Plaintiffs a second time for the same 4
loss. See Fisher, 98 N.Y.2d at 540 (noting that “replacement cost and diminution 5
in market value are simply two sides of the same coin”). Such a double recovery 6
would be “wholly inappropriate” under compensatory damages principles. 7
Dobbs, supra, § 5.12(2) at 832 (“It would not be appropriate to award both 8
replacement costs and diminished value of the land, since each of these measures 9
of damage is an attempt to compensate for the same loss . . . .”). 10
The other consequential damages claims — for mortgage carrying costs 11
and attorneys’ fees — fail on causation grounds. Regarding the former, WTCP 12
and 7WTCo. undertook the obligation to pay mortgage carrying costs before the 13
September 11th attacks; Defendants’ alleged negligence neither caused Plaintiffs 14
to bear those expenses, nor increased the price. See 103 N.Y. Jur. 2d Torts § 10. 15
As to the latter, New York courts allow plaintiffs to recover “the reasonable 16
value of attorneys’ fees and other expenses” when, “through the wrongful act of 17
his present adversary, [the plaintiff was] involved in earlier litigation with a third 18

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41
person in bringing or defending an action to protect his interests.” Coopers & 1
Lybrand v. Levitt, 384 N.Y.S.2d 804, 807 (1st Dep’t 1976). “Such expenses,” 2
however, must be “the natural and necessary consequences of the defendant’s 3
acts,” id., such as when an attorney’s malpractice exposes the client to liability, 4
see Cent. Trust Co. v. Goldman, 417 N.Y.S.2d 359 (4th Dep’t 1979). Defendants’ 5
alleged negligence lacks this requisite connection. Even assuming, arguendo, that 6
Defendants could have reasonably foreseen that their failure to adequately 7
monitor airport security checkpoints could lead to a hijacking and that the 8
hijackers would use the planes to destroy buildings, Plaintiffs’ attorneys’ fees 9
would still not have been the natural and necessary consequence of Defendants’ 10
negligence. That causal chain requires three further steps: first, Plaintiffs filing 11
insurance claims; second, the insurers refusing to pay; and third, Plaintiffs filing 12
suit. This series of events is too attenuated to support a claim for attorneys’ fees. 13
See Martinez v. Lazaroff, 48 N.Y.2d 819, 820 (1979) (concluding, as a matter of law, 14
that defendant was not a “proximate or legal cause of the injuries suffered” 15
because the “causal connection . . . was attenuated”); see also Apollo Steel Corp. v. 16
Melco Cranes, Inc., 609 N.Y.S.2d 121 (4th Dep’t 1994). The district court was 17

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therefore correct to deny Plaintiffs’ claims for consequential damages and to limit 1
their recovery to the diminution in value of their leasehold interests. 2
3. Calculation of Diminution in Market Value 3
Having concluded that Plaintiffs’ compensable damages are limited to the 4
diminution in the market value of their leasehold interests, we turn now to the 5
issue of calculating that change in value. In summary judgment decisions issued 6
on August 30, 2009 and December 5, 2012, the district court decided that the 7
diminution in the value of WTCP and 7WTCo.’s leasehold interests was, at most, 8
$2.805 billion and $737 million, respectively. The first figure derives from the 9
present value of the rental payments that WTCP promised to make over the 99‐ 10
year lifetime of its leases, and the second is culled from Professor Vandell’s 11
evaluation of the pre‐attack value of 7WTCo.’s leasehold interest. We conclude 12
that this process for calculating damages misapprehends valuation in the context 13
of leasehold interests. Accordingly, we remand so that the district court can 14
reassess Plaintiffs’ maximum possible recoveries. 15
As the district court recognized, an asset’s “market value is the price at 16
which [it] would change hands between a willing buyer and a willing seller, 17
neither being under any compulsion to buy or sell and both having reasonable 18

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knowledge of relevant facts.” United States v. Cartwright, 411 U.S. 546, 551 (1973); 1
see also Appraisal of Real Estate, supra, at 22. The diminution of an asset’s value, 2
then, is calculated by comparing the market value of the asset before and after a 3
particular event. But critically, although the terrorist attacks destroyed the 4
Leased Buildings, the relevant assets being valued in this case are Plaintiffs’ 5
leasehold interests. In short, when the Port Authority issued leases to WTCP and 6
7WTCo., it split the interests in the Leased Buildings into a “leased fee estate,” 7
which the Port Authority retained, and “leasehold estate[s]” held by Plaintiffs. 8
See William B. Brueggeman & Jeffrey D. Fisher, Real Estate Finance and Investments 9
5‐6 (14th ed. 2011). Each estate is a distinct asset with its own market value, and 10
it is the diminution in the value of that estate that is the measure of the owner’s 11
loss. See id.; see also Great Atl. & Pac. Tea Co., 22 N.Y.2d at 84. 12
The market value of a leasehold estate is the price at which the lease — 13
rather than the physical property in the estate — would change hands between a 14
willing buyer and a willing seller in a competitive market. Put differently, a 15
leasehold interest is worth what a buyer in a competitive market would be 16
willing to pay in order to assume both the rights and the obligations associated 17
with the lease. This value can be measured in at least two ways: through a “sales 18

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comparison approach,” which involves “comparing properties similar to the 1
subject property,” Appraisal of Real Estate, supra, at 417, or an “income 2
capitalization approach,” which requires analyzing expected costs and revenues 3
from the property to generate an assessment of future income, and 4
“capitaliz[ing] the income into an indication of present value,” id. at 471; see also 5
id. at 83; W.O.R.C. Realty Corp. v. Bd. of Assessors, 951 N.Y.S.2d 36, 47‐48 (2d Dep’t 6
2012) (discussing both methods of valuation in the context of income‐producing 7
property). Notably, because a leasehold interest entails expenditures (such as the 8
obligation to pay rent), it can have either a positive or a negative market value. 9
An example — using, for simplicity’s sake, the “sales comparison 10
approach” — illustrates the point.14 Suppose a lessee rents a building for 11
$500/month, and the market rate for renting a comparable property is 12
$600/month. In such a scenario, the lessee’s interest has a positive market value 13
because a buyer should be willing to pay up to $100/month to assume the lease. 14
See James R. MacCrate, The Valuation of Leasehold Interests, Real Estate Appraisal 15
14 Plaintiffs’ expert, Professor Vandell, employed the income capitalization approach
when calculating the extent to which the value of Plaintiffs’ leasehold interests changed
because of the attacks. While this is an accepted method for valuing leasehold interests,
we conclude that Vandell’s calculations inappropriately included costs associated with
replacing the leased buildings. Because the district court may revisit valuations using
the income capitalization approach on remand, we explain our reasoning infra.

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and Valuation Issues (June 2, 2010),https://realestatevaluation. 1
wordpress.com/2010/06/02/the‐valuation‐of‐leasehold‐interests/ (“A positive 2
leasehold is created when the market rent is greater than the contract rent.”). 3
Now suppose the market rental rate for comparable spaces was $400/month — 4
or, more relevantly for this case, that the lessee’s property suffered damage that 5
made it comparable to spaces renting for $400/month. Under those 6
circumstances, no buyer would be willing to pay to assume the $500/month lease 7
when she could rent a comparable property for $400/month. Instead, the lessee 8
would need to pay buyers to entice them to assume the lease’s obligations, thus 9
leading to a negative market value for the leasehold interest. See Appraisal of 10
Real Estate, supra, at 83. 11
As Plaintiffs’ experts explained, the district court’s evaluation of the 12
leasehold interests did not follow traditional principles of valuation and 13
incorrectly assumed that a leasehold interest cannot have negative value. 14
Determining the diminution in value of Plaintiffs’ leasehold estates requires 15
calculating the difference between the pre‐ and post‐attack market values of 16
those interests. For WTCP, the district court concluded that the pre‐attack value 17
of the leasehold interest was $2.805 billion and that the post‐attack value was $0. 18

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Neither figure is correct. Opposing summary judgment, WTCP’s expert Sheldon 1
Gottlieb explained that $2.805 billion “reflects only the net present value . . . of 2
rental payments that WTCP committed to make to the Port Authority,” and not 3
the pre‐attack value of the leasehold interest. J.A. 559. We agree. WTCP’s rental 4
payments created the leasehold interest, but do not necessarily reflect the amount 5
that a buyer in the open market would have paid to assume WTCP’s rights and 6
obligations under the leases — the relevant inquiry when assessing the market 7
value of a leasehold estate. Similarly, $0 is an incorrect post‐attack valuation. 8
Although WTCP could expect to receive $0 in rent from the destroyed buildings, 9
that figure fails to account for the company’s obligation to, at a minimum, 10
continue paying rent. Thus, as Gottlieb explained in opposition to summary 11
judgment and Vandell reiterated, WTCP’s leasehold interests had a negative 12
value after the attacks, and the diminution‐in‐value calculation must incorporate 13
that negative market value. See J.A. 569 (Gottlieb noting that the leasehold 14
interest had a “negative value” after the attacks); J.A. 624 (Vandell discussing 15
“negative fair market value”). 16
The district court took a different approach when evaluating damages for 17
7WTCo. Plaintiffs’ expert, Professor Vandell, assessed the value of 7WTCo.’s 18

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leasehold interest using the income capitalization approach and determined that, 1
immediately before September 11, 2001, it was worth $737 million. The district 2
court adopted this figure as the pre‐attack market value. But rather than 3
assessing the post‐attack value under a similar approach, the court again 4
declared the post‐attack leasehold value to be $0, leading to total losses of $737 5
million. Again, $0 reflects the rent that 7WTCo. could expect to receive for its 6
destroyed building, but misstates the post‐attack value of the leasehold interest 7
because, at a minimum, it fails to account for the continued obligation to pay 8
rent. 9
Thus, for both WTCP and 7WTCo., the district court calculated the decline 10
in value of their leasehold interests in a manner that is inconsistent with the 11
established practice for valuing leasehold estates. Because this error potentially 12
led to incorrect diminution‐in‐value calculations, we remand for the district court 13
to reassess Plaintiffs’ maximum recoverable damages. 14
Nonetheless, our conclusion that the district court incorrectly assessed the 15
diminution in value of Plaintiffs’ leasehold interests should not be confused with 16
an endorsement of Plaintiffs’ damages claims nor taken to mean that Plaintiffs 17
are necessarily entitled to a trial on damages or to a damages recovery. As to the 18

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flaws in Plaintiffs’ appraisal of damages, the district court was correct to observe 1
that both WTCP and 7WTCo. ignored its denial of reconstruction costs in their 2
diminution‐in‐value calculations. In his reports on damages, Professor Vandell 3
calculated the pre‐ and post‐attack values of Plaintiffs’ leasehold interests by 4
estimating the expected income and expenses associated with those interests — 5
in other words, by using the “income capitalization approach.” As Plaintiffs 6
acknowledge in their brief on appeal, Professor Vandell’s assessments include, as 7
part of the post‐attack valuations, reconstruction costs, tenant improvement 8
allowances, leasing commissions, and projected capital expenditures — all of 9
which are costs associated with replacing the Leased Buildings. See Appellants’ 10
Br. at 69 n.44. To be consistent with the denial of reconstruction costs, the post‐ 11
attack leasehold value should reflect only those continuing obligations that are 12
unrelated to reconstruction, such as rental payments. In other words, the post‐ 13
attack valuation should operate under the hypothetical that the Leased Buildings 14
were not rebuilt.15 15
15 We note that Professor Vandell’s post‐attack valuation also included the value of
expected rental income and operating expenses after reconstruction. Because these cash
flows assume that Plaintiffs reconstructed the Leased Buildings, the district court likely
should exclude them from the post‐attack valuation.

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It is also significant that WTCP signed its lease agreements shortly before 1
the terrorist attacks. The district court was correct to observe that market value 2
often reflects expected profits. Indeed, both this Court and New York courts 3
agree that “[m]arket value damages are ‘based on future profits as estimated by 4
potential buyers who form the ‘market,’ and ‘reflect the buyer’s discount for the 5
fact that the profits would be postponed and . . . uncertain.’” Schonfeld v. Hilliard, 6
218 F.3d 164, 176 (2d Cir. 2000) (quoting 1 Dobbs, supra, § 3.3(7)); see Sandoro v. 7
Harlem‐Genesee Mkt. & Nursery, Inc., 482 N.Y.S.2d 165, 167 (3d Dep’t 1984). 8
When there is “a recent sale price for the subject asset, negotiated by parties at 9
arm’s length,” that price may be the “best evidence” of the asset’s “market 10
value,” taking into account expected profits. Schonfeld, 218 F.3d at 178 (internal 11
quotation marks omitted); see W.T. Grant Co. v. Srogi, 52 N.Y.2d 496, 511 (1981). 12
As a result, WTCP is incorrect to state that it was “entitled to a reasonable 13
rate of return” above the rent it agreed to pay. Appellants’ Br. at 72. Purchasing 14
a commercial leasehold interest, like any other business venture, entails risk. The 15
fact that WTCP agreed to pay $2.805 billion in rent just months before the attack 16
may be evidence that the pre‐attack value of its leasehold interest was $0. That 17
is, if WTCP was the highest bidder in a competitive market for the Leased 18

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Buildings, no other buyer would have been willing to pay WTCP to assume the 1
leasehold interest. See Schonfeld, 218 F.3d at 176; J.A. 632 (“[F]air market value 2
represents the amount an investor . . . would be willing to pay for an assignment 3
of the Net Leases . . . .”). On the other hand, WTCP contends that the pre‐attack 4
value of its leasehold interest was $1.459 billion, relying in part on “increases in 5
market rents and net operating income levels that were reasonably expected 6
when management of the space . . . was transferred . . . to an experienced 7
manager such as WTCP.” J.A. 633. The district court recognized that the market 8
value of the leaseholds may have changed between April 2001, when WTCP 9
acquired the Main Site Leases, and September 2001, immediately prior to the 10
destruction of the properties, and it provided WTCP an opportunity to raise a 11
material issue of fact as to whether this had occurred. We leave it to the district 12
court to decide, in the first instance, whether there is a genuine dispute of 13
material fact about whether WTCP’s pre‐attack leasehold interests had positive 14
value, using the principles outlined here. But it is emphatically not the case that 15
Plaintiffs are entitled to damages that reflect a guaranteed profit on their leases. 16
In sum, our decision is a narrow one. We agree with the district court’s 17
decision that Plaintiffs can recover only for the diminution in the value of their 18

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leasehold interests, and are not entitled to reconstruction costs or the claimed 1
consequential damages. Nonetheless, we conclude that, as Plaintiffs’ experts 2
opined in their reports, the district court’s evaluation of WTCP and 7WTCo.’s 3
losses departed from established methods of valuing leasehold estates. 4
Accordingly, we remand as to the August 30, 2004 and December 5, 2012 orders 5
establishing the diminution in value of Plaintiffs’ leasehold interests. On 6
remand, the district court should reassess the diminution in value of those 7
leasehold estates by considering their pre‐ and post‐attack market values, with 8
the post‐attack values measured as if the Leased Buildings were not 9
reconstructed. The district court is free to decide, in the first instance, whether 10
additional discovery is needed before another set of summary judgment motions 11
or a trial on the issue of damages.16 12
13
16 The district court could allow additional discovery or conduct a limited trial on
damages, but may find such steps unnecessary. For instance, if the court concludes, on
the existing record, that the pre‐attack value of WTCP’s leasehold interests was $0, it
may be able to calculate their post‐attack value from Vandell’s report (or perhaps to
determine that such a specific calculation is unnecessary because the calculation could
not result in an award greater than the Plaintiff’s insurance recovery). To ensure that
the post‐attack value does not include costs and revenues associated with
reconstruction, the court in referring to Vandell’s report would need to exclude
“[r]ebuilding [c]osts,” J.A. 640, and “[p]rojected [r]evenues,” J.A. 643, and include only
those “[p]rojected [c]osts,” J.A. 644‐45, that WTCP would have incurred had the Main
Site Buildings not been rebuilt.

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B. Collateral Offset 1
Because we agree with the district court that WTCP and 7WTCo. can 2
recover only for the diminution in value of their leasehold interests, we must 3
address the second pillar of the decision below: the conclusion that Plaintiffs’ 4
insurance recoveries should reduce the amount of their potential tort award. “In 5
most jurisdictions[,] the damages recoverable for a wrong are not diminished by 6
the fact that the party injured has been wholly or partly indemnified for his loss 7
by insurance.” Healy v. Rennert, 9 N.Y.2d 202, 206 (1961). But New York has 8
chosen to override this “collateral source rule” by statute. See Oden v. Chemung 9
Cnty. Indus. Dev. Agency, 87 N.Y.2d 81, 85‐86 (1995). Pursuant to CPLR § 4545, if 10
a court finds that any “cost or expense” from an “injury to property” will be, or 11
has been, “replaced or indemnified from any collateral source,” such as 12
insurance, the court “shall reduce the amount of the award” for that injury by an 13
amount equal to the collateral reimbursement. Id. § 4545(c). This provision is 14
designed to assure that plaintiffs do not receive “duplicative recoveries” for the 15
same type of loss. Fisher, 98 N.Y.2d at 538. As a result, a defendant must show, 16
by clear and convincing evidence, that “the collateral source payment represents 17
reimbursement for a particular category of loss that corresponds to a category of 18

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53
loss for which damages were awarded.” Oden, 87 N.Y.2d at 84; see also Johnson v. 1
N.Y.C. Transit Auth., 929 N.Y.S.2d 215, 220 (1st Dep’t 2011). 2
Here, the district court conducted a bench trial to identify the specific 3
losses for which Plaintiffs’ insurance proceeds reimbursed them, and to 4
determine whether those reimbursements correspond to the same category of 5
loss as their potential tort recovery. After five days of testimony, on August 1, 6
2013 the court found that nearly all of WTCP and 7WTCo.’s insurance proceeds 7
reimbursed them for the costs of reconstructing the Leased Buildings and for 8
“business interruption,” i.e., lost revenue while the Buildings were being 9
rebuilt.17 S.P.A. 81. It then concluded that both these insurance proceeds and the 10
potential tort awards for lost leasehold value provide reimbursement for the 11
same category of loss, and therefore reduced the potential tort awards by the 12
value of the insurance recoveries.18 We conclude that the district court did not 13
17 The district court allocated $1.8 million of 7WTCo.’s insurance recoveries to lost
personal property. 7WTCo. and Defendants have reached a settlement regarding the
company’s claims for lost personal property, making this portion of the insurance
recoveries irrelevant for the purposes of this appeal.
18 Before offsetting insurance recoveries against the potential tort award, the district
court deducted the amount Plaintiffs spent on claims‐preparation expenses from the
total insurance recovery. This decision was not error. CPLR § 4545 directs courts to
reduce awards by the amount of collateral recoveries “minus an amount equal to”
certain past premium payments and the ongoing “cost to the plaintiff of maintaining
such benefits.” When an insurance policy requires the insured to investigate their own

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err, much less clearly err, in allocating Plaintiffs’ insurance recoveries to 1
replacement costs and business interruption losses, and agree with its conclusion 2
that these reimbursements correspond to the same loss as the potential tort 3
award. 4
We begin, however, on a procedural note. No doubt due to the large size 5
of the insurance recoveries, the district court opted to conduct a bench trial on 6
the collateral offset issue before a trial on liability and damages. Decisions to 7
bifurcate trials, like this one, are authorized by Federal Rule of Civil Procedure 8
42(b) and are typically well within the discretion of district courts. See Amato v. 9
City of Saratoga Springs, 170 F.3d 311, 316 (2d Cir. 1999). But Plaintiffs contend 10
that the timing of the collateral offset trial was inappropriate in this case because 11
CPLR § 4545 “makes clear that a ‘correspondence’ hearing should not occur until 12
after the jury has reached a verdict” on liability and damages. Appellants’ Br. 13
at 86. 14
Plaintiffs’ argument misapprehends the role of New York law under the 15
ATSSSA. The ATSSSA creates a federal cause of action for damages arising out 16
of the September 11, 2001 attacks, and incorporates state law as the “substantive 17
claims and submit proofs of loss, those expenditures may be counted as costs of
“maintaining [the insurance] benefits.”

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55
law for decision in any such suit.” ATSSSA § 408(2) (emphasis added). Federal 1
law controls procedure, and the order in which issues are decided is 2
quintessentially procedural — it “governs only the manner and the means by 3
which the litigants’ rights are enforced,” not “the rules of decision by which the 4
court will adjudicate those rights.” Shady Grove Orthopedic Assocs. v. Allstate Ins. 5
Co., 559 U.S. 393, 407 (2010) (internal quotation marks and brackets omitted). Of 6
course, there may be situations in which deciding the collateral offset issue 7
before a damages trial is impossible, particularly if there are multiple types of 8
loss for which the jury could compensate the plaintiff. See Shue v. Red Creek Cent. 9
Sch. Dist., 697 N.Y.S.2d 437, 439 (4th Dep’t 1999) (reversing a collateral offset 10
decision because the jury had not allocated damages to the different losses). But 11
this is not such a case. Here, the district court could predict, with complete 12
certainty, the element of loss for which a jury would award damage because 13
WTCP and 7WTCo. can recover only for the diminution in the market value of 14
their leasehold interests. See Oden, 87 N.Y.2d at 89 (“The problem of matching up 15
a collateral source to an item of loss is simply a matter of proof and factual 16
analysis.”). The district court therefore had a firm legal basis for trying the 17
collateral offset issue first, and did not abuse its discretion in doing so. 18

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Turning to the substance of the district court’s decision, Plaintiffs raise two 1
primary challenges. First, they argue that it was error to allocate their insurance 2
recoveries to replacement costs and business interruption losses. Second, they 3
contend that, even if it was possible to allocate their collateral recoveries to 4
replacement costs and business interruption losses, those reimbursements do not 5
correspond to the potential tort recovery for the lost market value of their 6
leasehold interests. Neither argument is persuasive. 7
The district court did not err by allocating the insurance recoveries to 8
replacement costs and business interruption. The court found, and Plaintiffs’ 9
experts agreed, that WTCP and 7WTCo. obtained two categories of insurance 10
coverage: “replacement cost” coverage, which covers damages to the buildings, 11
tenant improvements, personal property, and equipment, J.A. 1227; and 12
“business interruption” coverage, which reimburses for “loss of revenues or 13
rental values . . . from the date of the loss until” the buildings are restored, J.A. 14
1165. See S.P.A. 79. The district court also found that, when WTCP and 7WTCo. 15
submitted proofs of loss after the terrorist attacks, those submissions attached a 16
dollar value only to the costs of replacing the Leased Buildings and to business 17
interruption losses. Plaintiffs concede this point as well, admitting that these 18

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57
losses, by themselves, exceeded the value of the insurance policies. Appellants’ 1
Br. at 24‐26. 2
Nonetheless, Plaintiffs contend that, because they received their insurance 3
reimbursements in the form of “global settlement[s]” reached after litigation with 4
the insurers, Appellants’ Br. at 88, the district court should not have allocated 5
their insurance proceeds to replacement costs and business interruption losses. 6
In particular, they note that the settlements released “all claims” against insurers, 7
which they contend could include the value of “extracontractual claims for bad 8
faith” that they raised during the litigation. Appellants’ Br. at 88‐89. The district 9
court rejected this argument, and the record supports that decision. Defendants’ 10
insurance expert, Michael Beach, explained that settlements are common in the 11
insurance industry even when disputes do not go to litigation, and that 12
settlements typically contain a general release to ensure that there will be “no 13
further claims paid in relation to the insurance event.” J.A. 1175. To determine 14
what the settlement paid the insured for, one needs to “rely upon the underlying 15
documents” submitted, which did not, in his opinion, “suggest that the insurers 16
paid on anything other than” the replacement cost and business interruption 17
claims. Id. Indeed, Plaintiffs’ own insurance expert also did not allocate any 18

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58
money to “extra‐contractual claims” when evaluating WTCP and 7WTCo.’s 1
insurance recoveries, J.A. 1234, and the district court found that “[t]he recovery 2
against nearly every insurer was at, or near, the policy limits,” S.P.A. 90‐91. On 3
these facts, it was not error to allocate Plaintiffs’ insurance proceeds to the only 4
two categories of coverage they obtained: replacement cost coverage and 5
business interruption coverage.19 6
Plaintiffs’ second argument — that replacement costs and business 7
interruption losses do not correspond to the same category of loss as the 8
diminution in the market value of Plaintiffs’ leasehold interests — fares no better. 9
Our analysis begins, and in large part ends, with the New York Court of Appeals 10
decision in Fisher v. Qualico Contracting Corp., 98 N.Y.2d at 534. In that case, the 11
defendant negligently destroyed the plaintiffs’ residence in a construction 12
accident. The plaintiffs received insurance payments to cover “the actual 13
19 Plaintiffs note that, in Shue v. Red Creek Central School District, 697 N.Y.S.2d 437 (4th
Dep’t 1999), and Boshnakov v. Board of Education of Town of Eden, 716 N.Y.S.2d 520 (4th
Dep’t 2000), courts refused to find correspondence when juries issued verdicts that did
not assign damages to “each element of loss.” Shue, 697 N.Y.S.2d at 439. Unitemized
jury verdicts are not analogous to Plaintiffs’ insurance recoveries. Quite simply, in the
context of a trial, the defendant has an opportunity to request an itemized verdict and,
if it fails to do so, it becomes impossible to recreate the jury’s decisionmaking. Here,
however, the district court could ascertain the allocation of the settlements from the
record of expert testimony about industry practice and the circumstances surrounding
the insurance claims.

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59
necessary cost of replacing the home” and, after a lawsuit, won damages 1
equivalent to the “market value diminution” of their property. Id. at 536‐37. 2
Before entering judgment, however, the trial court offset the insurance recoveries 3
against the tort award. The Court of Appeals affirmed. Characterizing the harm 4
that the plaintiffs suffered as “real property losses,” the Court noted that such 5
losses “may be measured” by the lesser of “the cost of restoring the land to its 6
former condition” or “the diminution in the market value of the whole 7
property.” Id. at 539. It then rejected the argument that “cost of restoration and 8
diminution in market value represent two different categories of loss,” 9
explaining that these are “simply two sides of the same coin”: “[e]ach is a proper 10
way to measure lost property value, the lower of the two figures affording full 11
compensation to the owner.” Id. at 539‐40. Thus, because both measures of 12
damages “correspond[] to [the] property loss,” they can and should be offset 13
against one another. Id. 14
The district court concluded that the logic of Fisher applies in this case, and 15
that Plaintiffs’ insurance proceeds and potential tort recovery both compensate 16
for the same loss. S.P.A. 88‐90. We agree. At trial, Defendants’ expert, Professor 17
Daniel Fischel, explained that, as in Fisher, the relevant category of loss in this 18

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case is the “loss relating to destruction of property.” J.A. 1199. Both diminution 1
in market value (the potential tort recovery) and the combination of replacement 2
costs and business interruption compensation (the insurance recovery) reimburse 3
Plaintiffs for this same type of injury. 4
The market value of income‐producing properties like WTCP and 5
7WTCo.’s leasehold interests, according to Fischel, is “the present value of the 6
profits that [a buyer] expects to get from [those] asset[s].” J.A. 1200. When the 7
property is damaged or destroyed, the property owner loses all, or some, of those 8
expected profits. And because the property’s market value simply reflects the 9
present value of expected profits, the property’s value falls accordingly. Thus, an 10
award measured by the diminution in the property’s market value compensates 11
for the damage to the property by replacing the “present value of . . . [the] lost 12
profit stream.” J.A. 1200. 13
The combination of replacement cost and business interruption 14
compensation accomplish this same goal of replacing the property owner’s lost 15
profits. Replacement costs allow Plaintiffs to repair the Leased Buildings, 16
thereby restoring the revenue stream from those properties. J.A. 1199. Business 17
interruption compensation then fills the “gap in time between . . . the date of the 18

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destruction of the property and the time that the property is rebuilt,” J.A. 1200, 1
by substituting for the rental income lost during the rebuilding period. See J.A. 2
1205; Scribner, 138 F.3d at 472 (noting that replacement costs include the 3
“reduction of the rental or usable value of the property during the pendency of 4
the injury” (internal quotation marks omitted)). In other words, replacement 5
costs “restore [Plaintiffs’] income stream as a result of the building[s] being 6
completed,” and business interruption coverage compensates “for their loss of 7
revenues . . . from the date of the loss until those buildings were restored,” J.A. 8
1165, combining to produce a recovery that has precisely the same effect as an 9
award based on the diminution in the leasehold’s value. Thus, although 10
“replacement cost” and “business interruption cost” may be distinct categories 11
when it comes to insurance coverage, they nonetheless rectify the same “category 12
of loss” when it comes to tort recovery: namely, loss from the destruction of 13
property.20 See Fisher, 98 N.Y.2d at 540. 14
20 Perhaps recognizing the shortcomings in their legal position, Plaintiffs reiterate that
their actual rebuilding expenses exceeded both the diminution in value of their
leasehold interests and their insurance recoveries. This is simply an attempt to relitigate
an issue we decided earlier in this opinion — whether WTCP and 7WTCo. are entitled
to recover reconstruction costs — and is not relevant to whether Plaintiffs’ insurance
recoveries correspond to the same category of loss as diminution in market value.

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To summarize, we agree with the district court’s decision to allocate 1
Plaintiffs’ insurance recoveries to replacement costs and business interruption 2
losses, and with its conclusion that those insurance reimbursements correspond 3
to the same category of loss as Plaintiffs’ potential tort recoveries. It was 4
therefore necessary, under CPLR § 4545, to reduce Plaintiffs’ tort damages by the 5
amount of their insurance recoveries. Nonetheless, because we set aside the 6
district court’s orders calculating WTCP and 7WTCo.’s maximum recoverable 7
damages, we must also vacate the portion of the August 1, 2013 order that 8
reduces those damages to zero and enters judgment for Defendants. The district 9
court should return to the offset issue after reassessing the extent to which the 10
value of Plaintiffs’ leasehold interests declined due to the attacks.21 11
C. Prejudgment Interest 12
Plaintiffs’ last argument regarding damages focuses on the award of 13
prejudgment interest. In actions for property damage, New York law provides 14
that prejudgment “[i]nterest shall be recovered upon [the] sum awarded,” CPLR 15
21 WTCP’s argument that it must be able to recover separately for its $491.3 million
upfront payment to the Port Authority is unavailing. Tort damages compensate
Plaintiffs for the loss in value of their leasehold interests, not for particular payments
that they made to obtain those interests. There is no separate category of damages for
that initial payment to obtain the leasehold interests.

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§ 5001, “at a rate of [9%] per annum,” id. § 5004. These provisions “impose[] an 1
affirmative mandate on trial courts,” and leave “no discretion not to award 2
prejudgment interest under New York law.” Gussack Realty Co. v. Xerox Corp., 3
224 F.3d 85, 93 (2d Cir. 2000) (per curiam). Pursuant to federal law, by contrast, 4
“Congress has enacted a statute governing the award of postjudgment interest,” 5
but “there is no comparable legislation regarding prejudgment interest.” City of 6
Milwaukee v. Cement Div., Nat’l Gypsum Co., 515 U.S. 189, 194 (1995). The issue of 7
prejudgment interest is therefore “governed by traditional judge‐made 8
principles” and is typically left to the discretion of district courts. Id.; see also SEC 9
v. Contorinis, 743 F.3d 296, 307‐08 (2d Cir. 2014). On appeal, WTCP and 7WTCo. 10
contend that the district court erred by crafting an interest award under federal 11
principles rather than applying New York’s statutory rate. 12
We conclude that, under the ATSSSA, New York law determines the rate 13
at which prejudgment interest accrues. As discussed earlier, the ATSSSA creates 14
a federal cause of action for damages and directs that “[t]he substantive law for 15
decision in any such suit shall be derived from the law” of the state in which the 16
injury occurred — in this case, New York. ATSSSA § 408(b)(2). This command 17
to look to New York law includes the State’s law of damages, see Virgilio v. City of 18

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New York, 407 F.3d 105, 116 (2d Cir. 2005), and we have long held that “[t]he 1
awarding of prejudgment interest is considered” part of New York’s 2
“substantive law,” Schwimmer v. Allstate Ins. Co., 176 F.3d 648, 650 (2d Cir. 1999). 3
Accordingly, it is the New York statutes, and not federal judge‐made principles, 4
that determine prejudgment interest awards under the ATSSSA. 5
Defendants respond that state substantive law does not apply under the 6
ATSSSA when “such law is inconsistent with or preempted by Federal law.” 7
ATSSSA § 408(b)(2). But New York’s prejudgment interest statutes create no 8
such inconsistency. Federal prejudgment interest law is a matter of judicial 9
discretion and, like other federal common law doctrines, must give way when a 10
Congressional statute dictates a particular measure of damages. See Gen. Motors 11
Corp. v. Devex Corp., 461 U.S. 648, 651‐53 (1983) (concluding that reference to 12
“interest” in statute overrode longstanding common law doctrine of 13
prejudgment interest). Defendants, too, rely on this principle — otherwise they 14
could not argue that CPLR § 4545 replaces the federal common law rule against 15
reducing damages by the amount of collateral recoveries. See Appellants’ Br. at 16
87; see also Blake v. Del. & Hudson Ry. Co., 484 F.2d 204, 205‐06 (2d Cir. 1973). 17
Moreover, when Congress has adopted state substantive law in other federal 18

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statutes and did not wish to make state prejudgment interest available, it has 1
explicitly said so. See United States v. Kwai Fun Wong, 135 S. Ct. 1625, 1639 (2015) 2
(noting that, under the Federal Tort Claims Act, Congress explicitly prevented 3
recovery of prejudgment interest). The ATSSSA contains no such limitation. 4
Nor does state prejudgment interest conflict with the purpose of the 5
ATSSSA. As we explained in In re September 11 Property Damage Litigation, 650 6
F.3d 145 (2d Cir. 2011), Congress enacted the ATSSSA in part to “preserve the 7
continued viability of the United States air transportation system from 8
potentially ruinous tort liability.” Id. at 152. It accomplished this goal by 9
capping the extent of the airlines’ liability, not by limiting plaintiffs’ tort 10
recoveries. Cf. id. at 152‐53 (concluding that the ATSSSA did not create a 11
“limited fund” for recovery or restrict the manner in which plaintiffs could settle 12
claims). We therefore agree with WTCP and 7WTCo. that New York’s 13
prejudgment interest statutes, and not federal common law, governs the rate of 14
their prejudgment interest award. 15
This decision does not, however, end our analysis of prejudgment interest. 16
As Defendants observe, awarding interest also requires determining the base 17
amount from which that interest is calculated. On that issue, we conclude that 18

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the district court should calculate interest on the final tort award, and not the 1
diminution in the value of Plaintiffs’ leasehold interests; in other words, the 2
district court should perform the insurance setoff before calculating the 3
prejudgment interest. CPLR § 5001 requires that interest be “recovered upon a 4
sum awarded.” See Mfr.’s & Traders Trust Co. v. Reliance Ins. Co., 8 N.Y.3d 583, 588‐ 5
89 (2007). As the Court of Appeals has explained, this recovery “is intended to 6
indemnify successful plaintiffs for the nonpayment of what is due to them, and is 7
not meant to punish defendants for delaying the final resolution of the 8
litigation.” Love v. State, 78 N.Y.2d 540, 544 (1991) (emphasis added) (internal 9
citation and quotation marks omitted). CPLR § 4545 plays an important role in 10
determining what amount a plaintiff is due by requiring courts to “reduce the 11
amount of the award” to reflect collateral setoffs. Plaintiffs do not receive, nor 12
were they ever entitled, to the amount before the setoff. See CPLR § 4545 13
(requiring setoff even when the collateral reimbursement has not yet been made). 14
It therefore makes little sense to have Defendants indemnify Plaintiffs — by way 15
of prejudgment interest payments — for an amount that Defendants never owed. 16
Accordingly, the district court erred at the September 27, 2012 hearing in 17
setting the prejudgment interest rate and in its August 1, 2013 order calculating 18

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interest based on the diminution in value of Plaintiffs’ leasehold interests. On 1
remand, we direct the district court to calculate prejudgment interest on the 2
amount of the final award using the New York statutory rate. In other words, the 3
district court should reassess the lost value of Plaintiffs’ leasehold estates, reduce 4
that amount by the collateral setoff, and only then calculate prejudgment interest 5
based on the resulting award (if any) at the New York rate, running from the 6
date of the attacks. 7
D. United’s Duty as to Flight 11 8
Finally, the district court dismissed 7WTCo.’s claims against United 9
Continental Holdings, Inc. and United Airlines, Inc. (collectively, “United”), after 10
concluding that United had no “connection to Flight 11 or its hijackers,” S.P.A. 11
56, and therefore “did not owe 7WTCo a duty of care,” S.P.A. 58. We agree with 12
the district court’s well‐reasoned decision on this score, and therefore affirm its 13
dismissal of 7WTCo.’s claims against United. 14
On the morning of September 11, 2001, two terrorists entered Portland 15
International Jetport (“PWM”) in Portland, Maine, with plans to take US 16
Airways/Colgan Flight 5930 to Boston. They received tickets at the US Airways 17
counter and then passed through PWM’s security checkpoint before boarding the 18

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plane. Because PWM had only one such checkpoint, the airlines flying out of the 1
terminal — including United — had signed a “Shared Responsibility 2
Agreement,” under which Delta Air Lines assumed “responsibility for the 3
overall operation of the passenger security screening checkpoint,” including the 4
training of employees and conducting of employee background checks. J.A. 357. 5
This agreement was United’s only connection to US Airways/Colgan Flight 5930. 6
After arriving at Boston’s Logan Airport, the hijackers obtained boarding 7
passes for American Airlines Flight 11 at the American Airlines desk in Terminal 8
A. They then entered a second security screening checkpoint — this one 9
operated by Globe Aviation Services under a contract with American Airlines — 10
before boarding Flight 11. Three other hijackers arrived at Logan Airport by car 11
and followed the same route to the plane. United’s gates and security 12
checkpoints were located in a different terminal than those of American Airlines, 13
and United had no responsibility for ticketing or security along the terrorists’ 14
route to Flight 11. Once on board the flight, the terrorists hijacked the plane and 15
crashed it into 1 World Trade Center. “As 1 World Trade Center collapsed, it 16
spewed debris, some of which pierced the façade of 7 World Trade Center . . . , 17
causing fires and, eventually,” the building’s collapse. S.P.A. 48. 18

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On these facts, the district court correctly concluded that United had no 1
connection to Flight 11 or its hijackers and therefore owed no duty to 7WTCo. 2
Under New York law, the scope of a tortfeasor’s duty “is, in the first instance, a 3
legal issue for the court to resolve.” Waters v. N.Y.C. Hous. Auth., 69 N.Y.2d 225, 4
229 (1987). This analysis is fundamentally about “apportioning risks and 5
allocating the burden of loss,” id., and it is the “responsibility of courts . . . to 6
limit the legal consequences of wrongs to a controllable degree and to protect 7
against crushing exposure to liability,” Strauss v. Belle Realty Co., 65 N.Y.2d 399, 8
402 (1985) (internal quotation marks and citations omitted). To that end, New 9
York courts “have been cautious . . . in extending liability to defendants for their 10
failure to control the conduct of others” by limiting such liability to situations in 11
which “the defendant’s relationship with either the tortfeasor or the plaintiff 12
places the defendant in the best position to protect against the risk of harm.” 13
Hamilton v. Beretta U.S.A. Corp., 96 N.Y.2d 222, 232‐33 (2001). This cautious 14
approach is necessary to guard against “the specter of limitless liability” and to 15
constrain the class of possible plaintiffs. Id. at 233. 16
We applied these principles in the context of airline security in Stanford v. 17
Kuwait Airways Corp., 89 F.3d 117 (2d Cir. 1996). In that case, four terrorists 18

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purchased “interline tickets” that allowed them to board Middle East Airlines 1
(“MEA”) Flight 426 in Beirut and then transfer, without a new ticket or second 2
baggage check, to a Kuwait Airways flight in Dubai. Id. at 120. MEA employees 3
sold the tickets, checked the terrorists’ visas and passports, took their bags, and 4
were generally “the first line of defense” in Beirut Airport’s notoriously lax 5
security system. Id. The terrorists then boarded Flight 426, and transferred 6
directly to their Kuwait Airways flight in Dubai, which they hijacked. Id. at 121. 7
After the hijacking, they tortured three American passengers, who later brought 8
suit against, inter alia, MEA. In what we deemed a “close call,” this Court 9
concluded that MEA owed a duty of care to the plaintiffs. Id. at 127. To reach 10
that result, the panel relied on the fact that, because the terrorists checked in at 11
MEA’s ticketing desk and the airline knew about the poor security at Beirut 12
airport, it was well situated to implement additional screening measures. Id. at 13
124. Moreover, MEA’s duty extended to the Kuwait Airways flight because 14
MEA knew that, under the interline ticketing program, passengers would not 15
need to pass through a second round of screening before boarding the next flight. 16
Id. 17

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71
Here, by contrast, United was never in a position to serve as “the first line 1
of defense” for Flight 11. In Portland, US Airways controlled ticketing for Flight 2
5930 and Delta Airlines had responsibility for the airport security checkpoint. 3
United was a party to the Shared Responsibility Agreement regarding the 4
checkpoint, but that title is a misnomer: the Agreement transferred operational 5
control over the checkpoint from United (and other airlines) to Delta alone. 6
Moreover, unlike in Stanford, there was no interline ticketing program to connect 7
security in Portland to security in Boston. Instead, the September 11th hijackers 8
had to go through an entirely separate set of controls at Logan before boarding 9
Flight 11. United had no connection to those controls and, indeed, was not even 10
located in the same terminal. Thus, unlike in Stanford, “both logic and public 11
policy weigh heavily” against a duty to 7WTCo. under these circumstances. 12
Waters, 69 N.Y.2d at 230. United had “no control over either the acts of the 13
primary wrongdoer or the conditions” of the ticketing and security checkpoints 14
the terrorists used. Id. Nor would the goal of increasing safety “materially be 15
advanced” by expanding liability to defendants in United’s situation: each airline 16
already has ample incentive, both because of tort liability and federal 17
regulations, to police the ticketing desks and security checkpoints that they 18

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actually operate. Id. Accordingly, we affirm the district court’s decision to 1
dismiss 7WTCo.’s claims against United. 2
CONCLUSION 3
To summarize: 4
5
(1) Under the “lesser of two” principle (and assuming that 6
Defendants’ liability can be established), Plaintiffs are entitled to 7
recover an amount equal to the diminution in value of their 8
leasehold interests, but not the cost of rebuilding the Leased 9
Buildings. 10
11
(2) The district court properly concluded that Plaintiffs may not 12
recover for retenanting the Leased Buildings, hiring attorneys 13
during litigation with their insurers, paying mortgage carrying costs, 14
and losing tenant improvements. It was also correct to reduce the 15
amount of Plaintiffs’ insurance recoveries by the cost of preparing 16
insurance claims, rather than treating those expenses as a separate 17
category of damages. 18
19
(3) The district court applied an incorrect valuation methodology 20
when determining that the value of WTCP and 7WTCo.’s leasehold 21
interests fell by, at most, $2.805 billion and $737 million, 22
respectively. We therefore remand for reconsideration of this 23
valuation. 24
25
(4) Because the ATSSSA creates a federal cause of action and 26
incorporates only state substantive law, the district court did not err 27
by conducting a collateral offset hearing pursuant to CPLR § 4545 28
before a trial on liability or damages. Moreover, the district court’s 29
finding that Plaintiffs’ insurance recoveries reimbursed them for the 30
costs of reconstructing the Leased Buildings and for business 31
interruption was not clearly erroneous, and we agree with its 32

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decision that those reimbursements correspond to the same category 1
of loss as the diminution in value of their leasehold interests. 2
3
(5) Prejudgment interest should be calculated using New York’s 4
statutory rate and based on the amount of the award after the 5
collateral offset, rather than the diminution in value of Plaintiffs’ 6
leasehold interests. 7
8
(6) The district court correctly dismissed 7WTCo.’s claims against 9
United after concluding that United owed no duty of care regarding 10
Flight 11. 11
12
On remand, the district court may, consistent with the guidance in this opinion, 13
determine the diminution in value of Plaintiffs’ leasehold interests on the 14
evidence already submitted, after allowing additional fact‐gathering, or through 15
a trial on damages. It should then offset Plaintiffs’ insurance proceeds against 16
those hypothetical tort recoveries, and calculate prejudgment interest, if 17
necessary, based on the remainder. 18
Accordingly, we AFFIRM the judgment of the district court dismissing 19
7WTCo.’s claims against United. As described above, we also AFFIRM the 20
district court’s judgment insofar as it properly applied the “lesser of two” 21
principle to limit Plaintiffs’ damages, properly denied Plaintiffs’ claims for 22
consequential damages, and properly applied CPLR § 4545. Finally, we 23
VACATE the judgment in part and REMAND with instructions to assess the lost 24

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74
market value of Plaintiffs’ leasehold interests and, if necessary, to recalculate the 1
award of prejudgment interest in a manner consistent with this opinion. 2

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IN RE S EPT. 11 L ITIG .
‐1‐
S TRAUB , Circuit Judge, concurring in part and dissenting in part: 1
I concur with the majority in some respects; specifically, in its: (i) denial of 2
the plaintiffs‐appellants’ (“Plaintiffs”) claims for consequential damages; 3
(ii) affirmance of the District Court’s findings of correspondence under N.Y. 4
C.P.L.R. 4545; (iii) determination of the proper prejudgment interest to be 5
applied; and (iv) affirmance of the dismissal of certain claims against United 6
Airlines regarding Flight 11. 7
But for the reasons that follow, I respectfully dissent from the majority’s 8
decision limiting Plaintiffs’ potential tort recovery as a matter of law. That 9
determination raises complex, important, and novel questions of New York law 10
that are best addressed by certification for decision by the New York Court of 11
Appeals. 12
In this case, stated basically, Plaintiffs leased public property—buildings in 13
the World Trade Center—in return for rental payments and various other 14
obligations, including, they contend, an assurance to the property’s government 15
owner to repair any damage to the property during the leases’ term. After the 16

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IN RE S EPT. 11 L ITIG .
‐2‐
property was tragically destroyed, Plaintiffs suffered catastrophic economic 1
losses: they assert that not only must they continue to make rental payments on 2
their leases, but they must also pay for the World Trade Center’s rebuilding. 3
Plaintiffs sued the defendants‐appellants (“Defendants”) for compensation for 4
these losses, alleging that Defendants’ negligence led to the World Trade 5
Center’s destruction. 6
The majority permits Plaintiffs some recovery—mostly for the reduction in 7
rental value of their leases—but it categorically prohibits Plaintiffs from 8
obtaining compensation from Defendants for the substantial costs of rebuilding 9
the World Trade Center.1 In so doing, the majority decides two novel questions 10
of New York law that, in my view, should instead be addressed in the first 11
instance by the New York Court of Appeals. 12
Each of the two questions, if decided in Plaintiffs’ favor, could allow some 13
recovery for rebuilding costs. The first novel question of New York law is 14
1 Contrary to the majority’s suggestion, see Maj. Op. at 31, Plaintiffs seek compensation only for
the amounts necessary to rebuild the World Trade Center as it was before September 11, 2001,
see Brief for Plaintiffs at 14, 52 n.36; Reply Brief for Plaintiffs at 13.

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IN RE S EPT. 11 L ITIG .
‐3‐
whether Plaintiffs can recover for the diminution in value of their leases caused 1
by the leases’ obligation to rebuild. The majority excludes consideration of this 2
loss as a matter of law, but New York’s highest court might reasonably instead 3
consider it a jury question of proximate cause. The second novel question of 4
New York law is whether Plaintiffs can alternatively recover for their rebuilding 5
costs based on the World Trade Center’s public value. Again, the majority rejects 6
this basis for recovery as a matter of law, but where Plaintiffs were obligated to 7
repair damage to state property and have claimed that doing so is merited by the 8
property’s public value, New York’s highest court could justifiably find that 9
equity warrants compensation from the tortfeasor that caused the property’s 10
damage. 11
New York’s courts have not addressed these questions (or anything close 12
to them), and I do not believe that we can confidently predict how the New York 13
Court of Appeals would resolve them. At the least, and as I explain below, I 14
have considerable doubt that New York’s highest court would follow the 15
majority’s reasoning. 16

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IN RE S EPT. 11 L ITIG .
‐4‐
I. Issue One: The Obligation to Rebuild 1
As the majority explains, damage to property can be remedied either by 2
paying for the property’s lost value or by paying for the property’s restoration. 3
Maj. Op. at 26. Because either can place the victim in the same position as before 4
the wrong occurred, see id., New York’s courts generally award the lesser of the 5
two. This “lesser of two” principle affords full compensation while encouraging 6
mitigation of loss. See Hartshorn v. Chaddock, 135 N.Y. 116, 122 (1892); see also 7
Fisher v. Qualico Contracting Corp., 98 N.Y.2d 534, 539 (2002) (stating that the 8
principle provides a plaintiff with “no more than is reasonably necessary to 9
remedy fully the injury while avoiding uneconomical efforts” (internal quotation 10
marks omitted)). 11
Applying the “lesser of two” rule to this case, the majority reasons that 12
Plaintiffs are entitled to the lesser of the diminution in value of their leases 13
caused by the property’s damage and the amount necessary to repair the 14
property. Maj. Op. at 29. The leases’ purported obligation to rebuild, however, 15
complicates this analysis. It causes the diminution in value of Plaintiffs’ leases 16

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IN RE S EPT. 11 L ITIG .
‐5‐
(the first measure of compensation) to be significantly impacted by the cost of 1
restoration (the second measure). 2
A proper calculation of a lease’s value must take into account all of its 3
provisions. E.g., Irv‐Ceil Realty Corp. v. State, 43 A.D.2d 775, 775–76 (3d Dep’t 4
1973). As the majority itself states, a lease’s value is “the amount that a buyer 5
would be willing to pay for the right to assume the lessee’s rights and obligations.” 6
Maj. Op. at 28 (emphasis added). The obligation to rebuild would have 7
obviously discouraged any potential purchaser of Plaintiffs’ leases after 8
September 11, 2001. Yet the majority instructs the District Court to ignore it 9
when calculating the leases’ diminution in value—in the majority’s own words, 10
to award compensatory damages based on a “hypothetical” rather than reality. 11
See id. at 47–48, 51 n.15. The majority does not challenge Plaintiffs’ assertion that 12
they were actually damaged by the obligation to rebuild. Instead, the majority 13
reasons that Plaintiffs “should not receive a higher measure of damages” simply 14
because they contractually agreed in advance to repair the property in the event 15
of damage. Id. at 32. 16

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IN RE S EPT. 11 L ITIG .
‐6‐
New York’s highest court might easily disagree with the majority’s 1
conclusion. The majority’s reasoning runs contrary to the basic principle— 2
expressed in the “lesser of two” rule—that tort damages aim to restore the 3
injured plaintiff to the position that would have been occupied had the harm not 4
occurred. See McDougald v. Garber, 73 N.Y.2d 246, 253–54 (1989). Although the 5
“lesser of two” rule is one of mitigation, see Hartshorn, 135 N.Y. at 122, and thus 6
the majority emphasizes that a plaintiff’s post‐tort choice to repair property, on 7
its own, does not justify awarding replacement costs in excess of market value, 8
see Maj. Op. at 31, that is not this case. Plaintiffs could not have mitigated the 9
reduction in value of their leases caused by the contractual obligation to rebuild. 10
New York has a long history of permitting tort damages based on contractual 11
losses. E.g., Steitz v. Gifford, 280 N.Y. 15, 18–22 (1939) (holding defendant 12
responsible for reduced revenue on crop sold by plaintiff farmer after 13
defendant’s negligent driving incapacitated plaintiff, causing a delay in crop’s 14
sale). And in at least one case, a New York court has allowed a tort victim to 15
seek damages greater than the value of destroyed property based on the terms of 16
a lease agreement. See Plouffe v. Rogers, 144 A.D.2d 218, 219–20 (3d Dep’t 1988) 17

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IN RE S EPT. 11 L ITIG .
‐7‐
(permitting damage claim for early termination charges on an automobile’s lease 1
after negligently caused crash). Hence, there is considerable reason to think that 2
the New York Court of Appeals would, rather than preclude consideration of 3
Plaintiffs’ obligation to rebuild as a matter of law, instead permit a jury to 4
consider whether the obligation fits within the scope of proximate cause. 5
II. Issue Two: The World Trade Center’s Public Value 6
Even if Plaintiffs’ purported obligation to rebuild were ignored in 7
calculating the diminution in value of their leases—as the majority holds— 8
Plaintiffs might alternatively merit compensation for rebuilding based on the 9
World Trade Center’s public value. Plaintiffs, supported by a trio of experts and 10
an amicus brief on behalf of the State of New York, assert that the World Trade 11
Center is worth more to the public (and thus to its government owner) than both 12
what it cost to build and what it would be worth to a potential private 13
purchaser—in other words, that the World Trade Center’s public value is greater 14
than both its replacement cost and its market value. Accepting this 15
uncontroverted claim as true—as we must in assessing Defendants’ motion for 16
summary judgment—Plaintiffs’ rebuilding obligation serves the public interest 17

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IN RE S EPT. 11 L ITIG .
‐8‐
and is economically beneficial. The majority nonetheless determines that the 1
New York Court of Appeals would preclude consideration of the World Trade 2
Center’s public value in determining Plaintiffs’ compensation. I cannot reach the 3
same conclusion with any degree of confidence. 4
The World Trade Center was built for the public benefit, see N.Y. 5
Unconsol. Law §§ 6601(9), 6610; Courtesy Sandwich Shop, Inc. v. Port of N.Y. Auth., 6
12 N.Y.2d 379, 388–89, appeal dismissed, 375 U.S. 78 (1963), and the Port Authority 7
retains ownership of the World Trade Center pursuant to the site’s authorizing 8
legislation, see N.Y. Unconsol. Law § 6603. The decision to lease portions of the 9
World Trade Center to Plaintiffs was intended to “maximiz[e] the value of the 10
World Trade Center to the Port Authority and to the people of the region,” Joint 11
App’x at 377 (Mins. of the Port Auth. Bd. of Comm’rs, Apr. 26, 2001), and New 12
York courts have recognized the public purpose of projects involving leases of 13
public property to private parties, e.g., Murphy v. Erie County, 28 N.Y.2d 80, 87 14
(1971). 15
Although the New York Court of Appeals has not addressed the valuation 16
of tortiously damaged public property, it would be consistent with New York’s 17

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IN RE S EPT. 11 L ITIG .
‐9‐
basic principles of tort law to consider the World Trade Center’s public value in 1
determining the damages a tortfeasor owes for its destruction. As noted above, 2
the purpose of tort recovery under New York law is “to have the wrongdoer 3
make the victim whole.” Ross v. Louise Wise Servs., Inc., 8 N.Y.3d 478, 489 (2007). 4
Even though an owner of damaged property can typically be made whole by 5
compensation for the property’s diminution in market value, market value may 6
provide inadequate compensation for damage to property built and owned by 7
the government; such property might have a utility to the public—particularly a 8
site‐specific utility—that exceeds the property’s commercial worth. 9
Hence, whereas the “lesser of two” rule compares a property’s market 10
value to its replacement cost for determining full compensation to an owner of 11
private property, full compensation to a government owner of public property 12
might require consideration of the property’s public value—essentially, the 13
“lesser of two” of public value and replacement cost. For example, a tree in a 14
public park might cost $5,000 to plant, have a value to the public in its location of 15
$10,000, and yet increase the park’s market value by only $300. If the tree were 16
negligently cut down, replanting would not constitute waste, and the 17

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government would be made whole by compensation of $5,000, not $300.2 This is 1
the calculus that Plaintiffs’ experts assert applies to the World Trade Center: that 2
its market value is less than its replacement cost, which, in turn, is less than its 3
value to the public. 4
These considerations could lead the New York Court of Appeals to 5
conclude that the tortious destruction of property built and owned by the 6
government merits a compensatory award of replacement costs where the 7
property’s value to the public exceeds its costs of restoration, regardless of its 8
market value. Indeed, in different contexts, New York courts permit 9
compensation based on replacement cost—in excess of lost market value—where 10
market value provides an inadequate measure of loss. E.g., Lake v. Dye, 232 N.Y. 11
209, 214 (1921) (household goods); cf. Matter of Rochester Urban Renewal Agency 12
2 A variation of this hypothetical is included in Professor Dobbs’s treatise on remedies. See 1
Dan B. Dobbs, Law of Remedies § 1.9, at 46–47 (2d ed. 1993). In Professor Dobbs’s version, the
tree is on privately‐owned land. Although paying for the tree’s replacement “is not inefficient”
and “may add to efficiency in providing appropriate deterrence,” Professor Dobbs cautions
against measuring the defendant’s liability by the public’s loss where the property is privately
owned. Id. at 46. “The answer is different,” writes Professor Dobbs, “when it comes to public
resources” in which the public has a right that may be pursued by the government. Id. at 47.

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(Patchen Post), 45 N.Y.2d 1, 8–9 (1978) (compensation for government taking of 1
“specialty” property, which might be worth to its owner “everything it cost to 2
construct and more” yet lacks a buyer “willing to purchase it even at its 3
reproduction value”). 4
Under the majority’s reasoning, however, Defendants are responsible for 5
much less: simply the reduction in value of Plaintiffs’ leases without 6
consideration of the substantial costs of rebuilding. Defendants might 7
conceivably be liable to the World Trade Center’s government owner for 8
rebuilding costs, except that the Port Authority can receive assistance with 9
rebuilding from Plaintiffs pursuant to their rebuilding obligation, which “served 10
to protect the extensive public investment in the [World Trade Center].” Brief for 11
Amicus Curiae State of New York (“N.Y. Amicus Br.”) at 21. The Port Authority 12
is “not presently seeking damages” from Defendants “so long as” Plaintiffs 13
“continue[] to comply” with their contractual obligations. Joint App’x at 589 14
(Decl. of Keith E. Harris, Chief of the Commercial Litig. Div. of the Port 15
Authority, Aug. 11, 2008). The result is a windfall for Defendants, as they must 16

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pay for much less than the full scope of damage caused by their alleged tort, 1
while Plaintiffs may be compelled to fund the World Trade Center’s rebuilding. 2
I am not convinced that the New York Court of Appeals would accept this 3
result. It has, for many years, applied equitable principles to permit recovery 4
against a wrongdoer by a party that was “compelled to pay the damages which 5
the wrongdoer should have paid.” Dunn v. Uvalde Asphalt Paving Co., 175 N.Y. 6
214, 217 (1903). The equitable doctrine of subrogation, for instance, in the context 7
of insurance, “entitles an insurer to ‘stand in the shoes’ of its insured to seek 8
indemnification from third parties whose wrongdoing has caused a loss for 9
which the insurer is bound to reimburse.” N. Star Reinsurance Corp. v. Cont’l Ins. 10
Co., 82 N.Y.2d 281, 294 (1993). The New York Court of Appeals has explained, in 11
reasoning that could easily apply here, that subrogation “allocates responsibility 12
for the loss to the person who in equity and good conscience ought to pay it, in 13
the interest of avoiding absolution of a wrongdoer from liability simply because 14
the insured had the foresight to procure insurance coverage.” Id.; see also 15
Teichman by Teichman v. Cmty. Hosp. of W. Suffolk, 87 N.Y.2d 514, 521 (1996) 16
(stating that the “right of subrogation” was “formulated to prevent unjust 17

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enrichment” and “is based upon principles of equity and natural justice” 1
(internal quotation marks omitted)); Pittsburgh‐Westmoreland Coal Co. v. Kerr, 220 2
N.Y. 137, 140 (1917) (“The doctrine of subrogation is a device to promote 3
justice.”). The New York Court of Appeals has repeatedly emphasized that the 4
equitable principles of subrogation should be applied broadly where warranted. 5
E.g., 3105 Grand Corp. v. City of New York, 288 N.Y. 178, 182 (1942) (subrogation 6
“is a highly favored remedy” and “courts are inclined to extend rather than 7
restrict its application”); Ocean Accident & Guarantee Corp. v. Hooker 8
Electrochemical Co., 240 N.Y. 37, 47 (1925) (asserting that the “principle of 9
subrogation ought to be liberally applied for the protection of those who are its 10
natural beneficiaries”). 11
The majority asserts that Plaintiffs cannot recover for the public’s loss 12
because they did not serve as the public’s “trustee,” Maj. Op. at 37, but the 13
majority does not address the possibility that Plaintiffs may nonetheless warrant 14
compensation based on a rebuilding obligation that “served to protect” the 15
public’s investment. N.Y. Amicus Br. at 21. Instead, the majority cites United 16
States v. 564.54 Acres of Land, 441 U.S. 506 (1979), to note that the Supreme Court 17

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has, in determining “just compensation” for purposes of the Takings Clause, 1
refused to compensate private plaintiffs for the community value of their 2
properties. See Maj. Op. at 37. Yet 564.54 Acres of Land is hardly instructive in 3
predicting how New York’s highest court would resolve the issues presented 4
here. It addressed the power of eminent domain (and thus discussed the 5
constitutional limits of “just compensation,” not what a tortfeasor ought to pay), 6
it has not once been cited by a published decision of New York’s courts, and, 7
unlike here, it involved a private entity that was “under no legal or factual 8
obligation to replace” the taken property or compensate the public for its 9
reconstruction, 441 U.S. at 515. Contrary to the majority’s point, moreover, the 10
New York Court of Appeals has explicitly considered public value in 11
determining just compensation for a government taking of private property. See 12
Matter of Port Auth. Trans‐Hudson Corp. (Hudson Rapid Tubes Corp.), 20 N.Y.2d 457, 13
465, 468–70 (1967) (holding that private owner of rail lines and tunnels taken by 14
Port Authority was entitled to more than property’s market value, which was 15
scrap, because property formed “an essential part of an essential public facility”), 16
cert. denied, 390 U.S. 1002 (1968). 17

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* * * 1
New York’s courts have not addressed the issues discussed above, and I 2
do not believe that we can confidently predict how the New York Court of 3
Appeals would resolve them. The issues are complex, their resolution requires 4
significant public policy choices, and their import to New York State is evident— 5
significant enough, in fact, to warrant the submission of an unsolicited amicus 6
brief on its behalf in this case. Leases frequently include an obligation to rebuild, 7
and New York’s amicus brief explains that “[m]any public projects are 8
implemented through long‐term leases to private parties.” N.Y. Amicus Br. at 3. 9
The State emphasizes its “strong interest in avoiding misclassification of public 10
property as merely private in nature, and in preventing the mistaken 11
construction of New York law to provide an incentive for private parties to 12
abandon their contractual rebuilding and restoration obligations to public 13
entities.” Id. at 35. 14
Certification can delay resolution of a specific case, but as the Supreme 15
Court has noted, “[i]t does, of course, in the long run save time, energy, and 16
resources and helps build a cooperative judicial federalism.” Lehman Bros. v. 17

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Schein, 416 U.S. 386, 391 (1974). Deciding an undetermined question of state law 1
rather than certifying the question to the state’s highest court impedes the 2
development of state law and exposes litigants to the risk that our conjectures on 3
state law are wrong. E.g., Solomon R. Guggenheim Found. v. Lubell, 77 N.Y.2d 311, 4
318 (1991) (rejecting our holding on an open question of New York law after we 5
declined to certify). The New York Court of Appeals has underscored “the great 6
value in New York’s certification procedure” and affirmed that certification 7
“facilitat[es] the orderly development and fair application of the law and 8
prevent[s] the need for speculation.” Tunick v. Safir, 94 N.Y.2d 709, 711–12 (2000). 9
The New York Court of Appeals might decline to answer our certified questions, 10
although it does so rarely. See id. at 712. But by declining to certify at all, we 11
deny it the opportunity to resolve, in the first instance, novel questions of state 12
law rife with public policy implications. 13
The State of New York’s amicus brief in this case explicitly requests, in the 14
alternative, that we certify this case to the New York Court of Appeals. N.Y. 15
Amicus Br. at 36 n.11. I would grant that request, as I find that the issues of New 16
York law raised here are best addressed by certification. See N.Y. Comp. Codes 17

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R. & Regs. tit. 22, § 500.27(a); 2d Cir. Local R. 27.2; see also In re Santiago‐ 1
Monteverde, 747 F.3d 153, 158 (2d Cir. 2014) (stating general requirements for 2
certification). 3

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