GRP Rainer Lawyers and Tax Advisors in Cologne, Berlin, Bonn, Dusseldorf, Frankfurt, Hamburg, Munich, Stuttgart and London www.grprainer.com/en conclude: In its judgement of July 31, 2013 (File number: VIII ZR 149/13), the Federal Supreme Court (BGH) commented on the commercial use of a single family home contrary to the lease. In particular, business activities of a freelance or commercial nature that are recognizable from the outside, may under certain circumstances constitute a use which, in principle, the landlord does not have to allow without a corresponding agreement. In evaluating this, it does not matter whether the business carried out in the home has caused any concrete disturbance in the past or whether the tenant has tried to avoid such a disturbance. The very type and format of the commercial enterprise conducted in the home can already speak against a possible exemption from the principles involved.