220
ORCO
CH
CH
Art. 270a Bundesgesetz vom 30. März 1911 betreffend die Ergänzung des Schweizerischen Zivilgesetzbuches (OR)
OR; Zweite Abteilung: Die einzelnen Vertragsverhältnisse; Achter Titel: Die Miete; Zweiter Abschnitt: Schutz vor missbräuchlichen Mietzinsen und andern missbräuchlichen Forderungen des Vermieters bei der Miete von Wohn- und Geschäftsräumen; E. Anfechtung des Mietzinses; I. Herabsetzungsbegehren; 2. Während der Mietdauer
Art. 270a OR
Der Mieter kann den Mietzins als missbräuchlich anfechten und die Herabsetzung auf den nächstmöglichen Kündigungstermin verlangen, wenn er Grund zur Annahme hat, dass der Vermieter wegen einer wesentlichen Änderung der Berechnungsgrundlagen, vor allem wegen einer Kostensenkung, einen nach den Artikeln 269 und 269 a übersetzten Ertrag aus der Mietsache erzielt.
Der Mieter muss das Herabsetzungsbegehren schriftlich beim Vermieter stellen; dieser muss innert 30 Tagen Stellung nehmen. Entspricht der Vermieter dem Begehren nicht oder nur teilweise oder antwortet er nicht fristgemäss, so kann der Mieter innert 30 Tagen die Schlichtungsbehörde anrufen.
Absatz 2 ist nicht anwendbar, wenn der Mieter gleichzeitig mit der Anfechtung einer Mietzinserhöhung ein Herabsetzungsbegehren stellt.
Gerichtsentscheide zu dieser Bestimmung (67)
BGE 122 III 257 (Art. 270a OR)
Rent reduction defense: net yield must be based on individual investment costs, not objective property value, but market-customary rent remains an alternative defense.
Main ground for the tenant's rent reduction claim, which the court upheld in the dispositive.
C/15901/2023 · ge (art. 270a CO)
Tenants Appeal Rent Increase Calculation in Older Building Case
This article regarding rent reduction based on the relative method was cited in the discussion about the absolute method used as a defense.
C/15890/2023 · ge (Art. 270a CO)
Tenants' Appeal on Rent Increase Calculation Method Upheld
Cited in the legal analysis concerning the tenant's right to invoke the absolute method of yield as a defense against an increase based on the relative method.
CACIV.2025.17 · ne (Art. 270a al. 1 CO)
Tenant Rent Reduction Appeal Based on Decreasing Mortgage Rate
The court implicitly confirmed the application of this article as the basis for the original rent reduction claim, as the appellants did not challenge the lower court's finding that the claim was not time-barred based on this provision.
MJ240053.L · zh (Art. 270a Abs. 3 OR)
Tenant Challenge to Rent Increase and Unquantified Rent Reduction Dismissed
The court's analysis hinges on this provision concerning the inapplicability of the prior negotiation requirement when challenging an increase concurrently with requesting a rent reduction.
C/23767/2021 · ge (art. 270a al.2 CO)
Landlord Appeal on Commercial Rent Reduction Upheld
The court confirmed the lower court's finding that the preliminary requirement for a rent reduction claim was met.
C/8525/2021 · ge (art. 270a al. 2 CO)
Rent Reduction Claim Inadmissibility Due to Statutory Deadline
Cited to establish the deadline that the applicants failed to meet, leading to the claim being declared inadmissible.
C/17773/2020 · ge (Art. 270a al. 1 CO)
Lease Rent Reduction Based on Mortgage Interest Rate Change
Legal basis for examining the tenants' subsidiary conclusions regarding rent reduction due to a change in calculation bases, specifically a drop in the reference mortgage rate.
C/14667/2021 · ge (art. 270a al. 1 CO)
Tenant Appeal Regarding Rent Reduction Calculation Based on Mortgage Rate Changes
The court confirmed the lower court's decision, which addressed the tenant's request for rent reduction based on this provision.
ZKBER.2023.12 · so (Art. 270a Abs. 1 OR)
Tenant Rent Reduction Appeal Based on Falling Reference Rate and Burden of Proof
This article forms the substantive basis for the appeal because the court ruled that a claim for rent reduction based on a sinking reference rate is justified.
ZKBER.2023.12 · so (Art. 270a Abs. 1 und 2 OR)
Tenant Rent Reduction Appeal Based on Falling Reference Rate and Burden of Proof
Cited in the reasoning regarding the requirements for the tenant's rent reduction request.
4A_252/2023 (Art. 270a OR)
Indexed rent after fixed index period: mortgage reference rate at the time the parties could first terminate, not at lease inception or request date, governs rent reduction.
Legal basis for the tenant's right to request a rent reduction on a relevant termination date.
MJ220094.L · zh (Art. 270a OR)
Landlord's Right to Renovate During Lease Extension vs. Tenant's Rights
Cited as the basis for the tenant's claim for rent reduction due to changes in the calculation basis, specifically the reference interest rate.
2023.06.13.zr.2.rich · bl (Art. 270a Abs. 1 OR)
Rent Reduction Denied Due to Operating Cost Increase and Permissible Lump Sum Calculation
Basis for the tenant's claim to challenge the rent and request a reduction.
2023.06.13.zr.2.rm.0 · bl (Art. 270a OR)
Copyright Society v. Defaulting Company
Allows tenants to challenge rent as abusive and request a reduction.