Kernrechtsfrage
Whether ancillary costs mentioned only in standard terms were validly agreed and chargeable to the tenants.
Extrahierter Entscheid
The charges listed only in the general terms were not sufficiently and clearly agreed; no obligation arose for those items beyond the rent contract itself.
Extrahierte Begründung
Art. 257a(2) OR requires an explicit, exact agreement on ancillary costs. A reference to standard terms does not suffice if the tenant cannot recognize from the contract itself which costs are transferred.