Section 7 (4) sentence 2 EStG (German Income Tax Act) permits a higher depreciation rate if the actual remaining useful life of your building is demonstrably shorter than the standard 50 years. An expert opinion provides exactly this proof — and the tax office must accept it (Federal Fiscal Court, ruling of 28.07,2021). The shorter the remaining useful life determined by the appraisal, the the higher the individual depreciation rate: for a remaining useful life of 25 years, for example, 4% instead of 2% per annum.