Kernrechtsfrage
Whether the tenant was bound to pay ancillary costs for the apartment under Art. 257a(2) OR without a sufficiently clear special agreement.
Extrahierter Entscheid
No. Ancillary costs for the apartment were not shown to have been clearly and specifically agreed; the landlord must bear them.
Extrahierte Begründung
A special agreement may arise from the circumstances, but the tenant must be able to identify the ancillary costs clearly. The presence of the same advance payment as in the commercial lease and the earlier lease of the shop did not establish a sufficiently clear agreement for the apartment.