I believe the Manhattan rule on residential buildings is a maximum of one parking spot for every five apartments. Commercial parking is disappearing as it gets converted into apartment and office buildings. Even around me non-street parking can be rather expensive - recently saw  one space being advertised for an even $100K plus property taxes - note, this is just a parking space, admittedly it was in Park Slope which is about as expensive as it gets in Brooklyn, but is also purely residential. When I moved to my neighbourhood many of the old carriage houses were being used as garages, now they're rapidly being turned into condos. (The original neighbourhood plan had alternate streets of large homes with carriage houses facing out the back).