What is the depreciation value of an 11-year-old built-in kitchen?

Why the hell should the landlady buy them? She’d sell them for 150€ to a local pickup buyer on eBay Classifieds. In that case, the handful of change would be better off in your mother’s pocket.

Everything that needs to be said is already in #2:

You can’t force anyone to buy something. If the new resident doesn’t want them, then he doesn’t want them. And after 10+ years, the value is basically zero anyway.

Why the hell should the landlady buy them?

Because she wants them for some unknown reason.

Wrong - kitchens and furniture are depreciated over 25 years.

I would always take a closer look at the website, including the date used as a basis. Not every site states the correct information. And if furniture is 25 years... haha... you just can't believe that

For tax purposes, kitchens are depreciated exactly as I said, namely in 10 years.

Correct!

Just a small final remark:

My mother could sell the kitchen for €1200! Since she herself did not think this was possible, after receiving the money she transferred a €300 discount back to the buyer.

Just a small final remark:

My mother could sell the kitchen for €1200! Since she herself did not think that was possible, after receiving the money she transferred a €300 discount back to the buyer.

Why?

Longer story, the buyer was a relative of the painter. Everything was settled a bit together. So in the end, she sold the kitchen for €900, or rather gave the kitchen away and got the whole house painted.