Unless you live in a slightly more evolved country, where a simple ownership transfer is not enough to kick out the renters and you actually have rights. Here you need to prove that you either want to use it for yourself ( 2 years minimum, government checks up on that) or it is somehow damaged beyond repair.

It's rather common here that people get paid 10-100k euros just so they move out of an apartment ( this is per flat/apartment, so numbers can get huge for bigger buildings) and the owner can sell the empty old building to an investor/developer. Shows what insane profit margins are still to be had, if they make profits despite that.

This usually happens with old and cheap buildings in now gentrified, suddenly fancy neighborhoods.