Kernrechtsfrage
Whether the landlord's unilateral modification introducing separate ancillary-cost advances complied with the formal and motivational requirements of Art. 269d CO and Art. 19 OBLF.
Extrahierter Entscheid
The notice was invalid because it did not state with sufficient precision which costs were being separated from the rent and did not allow the tenant to assess the economic scope of the change.
Extrahierte Begründung
For a unilateral disadvantageous modification, the official form must contain precise reasons enabling the tenant to understand the scope and justification of the change. Here, the notice gave no adequate basis for the amount of the proposed ancillary-cost advance and did not disclose the costs previously included in the rent.