New York City is divided into three basic zoning districts: Residence (R), Commercial (C) and Manufacturing (M). The three basic districts are further sub-divided to allow for a wide range of building forms and uses.
Zoning districts are assigned a letter and number. In general, a higher number means a higher density of people is allowed or more intense land uses are permitted.
In addition, Special Purpose Districts modify or supplement the zoning districts in some neighborhoods to address unique conditions.
There are also special zoning rules for some areas across the city that have shared features, such as areas along the waterfront or around airports.