Questione giuridica chiave
Whether ancillary charges were validly and specifically agreed to be borne by the tenant.
Decisione estratta
No valid special agreement specified which ancillary charges were owed by the tenant; monthly advance payments did not suffice.
Motivazione estratta
Under Art. 257a(2) CO ancillary charges are payable only if specially agreed and described clearly and precisely; the lease clause here named only a monthly advance and later settlement, without specifying the relevant charges.