Key legal question
Whether the respondent owed CHF 2,000 per month for the pylon installation
Extracted holding
No enforceable agreement on the monthly fee was reached, and the landlord could not rely on a unilateral rent increase.
Extracted reasoning
The tenant had only agreed in principle to the pylon; the landlord had expressly rejected the price proposal and no valid acceptance could be inferred from the conduct during ongoing negotiations. In addition, a unilateral rent increase would have required the statutory form.