This only makes sense if the large landlord conglomerate that likely owns them isn't happy to just leave them empty to keep the upward pressure on rents.
This is also why we'll continue to have problems unless we get state-owned construction companies - the landlord conglomerates that have the money to get new apartments built will never commission enough apartment blocks to actually drive down prices, instead trickling in supply to keep prices where they are, or higher (regardless of the incentives). These are the problems we face in Amsterdam, anyway.