What if the remaining useful life is over?

Hello, I own a small house with two apartments. Both apartments are rented. I have to pay tax on the rental income and can calculate the depreciation against it to reduce the taxes. I will have an appraisal of the remaining useful life prepared in order to increase the depreciation. I estimate the remaining useful life to be around 33 years. What happens after the remaining useful life? I still have to pay tax on the income, we are in Germany... Can I then prepare another report?