Yes. Mortgage blocking is only in the real estate cadastre. mortgage rental has no effect. You may not sell the apartment or stop it elsewhere, but you can rent it. A lot of people do that today. It is a good price for apartments, low interest rates on the mortgage and in a few years they have paid a large part. If it is an apartment in os.vl. Which certainly does, they wouldn't give you a mortgage on the cooperative, so you don't need the consent of the landlord's association to agree to rent. When buying, make sure that the house has a community of owners established and duly registered in the Commercial Register, otherwise there could be a problem with the transfer of real estate in the cadastre.