From the New York Times:
Q. Many of the large apartment buildings in my neighborhood put signs in the street in front of the building that say, “Please do not block entrance of building.” Presumably this is so that residents have easy access when getting out of taxis. But a sign in the street blocks what could be a parking space. Is this legal?
A. It is legal for some large hotels, but not for apartment buildings.
“If you are talking about an apartment building, it is illegal to reserve parking in front of the building,” said Craig Chin, a spokesman for the city’s Department of Transportation. Traffic rules forbid reserving a space or preventing a vehicle from parking by putting something in the roadway, including an unauthorized sign.
Hotels, provided they have at least 100 rooms, can apply for a loading zone. (They can’t merely create one.) A 100-room hotel will be allowed two parking spaces (40 feet). For 500 rooms, a hotel can get three spaces, and for 1,000 rooms, five spaces.