Questão jurídica principal
Whether the cantonal court acted arbitrarily by disregarding the landlord's operating-cost documents in the rent-yield calculation.
Decisão extraída
No. The landlord failed to produce probative accounting documents showing the operating expenses, so excluding those costs from the yield calculation was sustainable.
Fundamentação extraída
The submitted lists and internal accounts lacked supporting vouchers; several items were unexplained; some expenses varied sharply without proof. The landlord bore the burden to prove a blocking excessive yield and did not meet it.