Key legal question
Whether the 1928 contract exempted SBB from the sewer connection fee for the new building.
Extracted holding
No. The contract regulated the transfer and drainage rights for the then-existing situation, not a permanent exemption from later public-law connection fees.
Extracted reasoning
The wording and context show that the contract concerned the ownership and drainage consequences of the land transfer. It did not regulate future public sewer fees, and public water-protection rules could not be altered by private agreement.