> 1. there are 57,000 unoccupied apartments in NYC because city regulations on rents make them unprofitable to rent out.
The correct quote should be:
> According to state data, approximately 57,421 rent-stabilized apartments were vacant across New York City
The key term here is "rent-stabilized". And the reasons why they are vacant is much more complex "because city regulations on rents make them unprofitable to rent out". That is simply one category of rent-stabilized apartments that are vacant.