Who owns the apartments, houses, etc in NYC?

I was a tad surprised to see most apartments/housing units in the boroughs of NYC such as The Bronx, Queens, and Brooklyn has majority percents of tenants renting their property. My question is who is usually the ultimate owners of such properties? My guess would be either the banks, or previous owners, such as before demographic shifts. Anyways any help on this subject would be appreciated, as I’m stumped.