Resources and directions for studying the city’s built environment.

NY City Map
Interactive map of the city’s built environment featuring detailed information about history, zoning regulations, ownership, and others.

Official website of the Department of Buildings
The NYC Department of Buildings ensures the safe and lawful use of over 975,000 buildings and properties by enforcing the City’s Building Code, Electrical Code, Zoning Resolution, New York State Labor Law and New York State Multiple Dwelling Law.

A commercial website containing detailed information about the market of real estate property in NYC.

New York Society Library: A Guide to Researching a Building
A detailed and comprehensive guide to studying a building.

Digital Sanborn Maps, 1867-1970
If the building is pre-1970s, and depending on one’s budget for purchased mapping, the usual procedure is to obtain the Sanborn historical records for the previous and existing-condition structures on the site.