Questão jurídica principal
Whether the lease contained a valid special agreement making the tenant liable for the ancillary costs claimed.
Decisão extraída
No valid special agreement was established; the contract named monthly advances and a final settlement, but did not clearly specify which ancillary costs the tenant had to bear.
Fundamentação extraída
Under Art. 257a(2) CO ancillary costs are chargeable to the tenant only if specially agreed and described clearly and precisely. Regular payment of advances does not prove such an agreement.