Building Inspector is not compatible with Internet Explorer 9 or earlier. Please download a more recent version or try another browser.

Please rotate your device to portrait orientation

Help trace
New York City's

All buildings have been inspected!
More is coming soon...

The New York Public Library is training computers how to recognize building shapes and other information from old city maps. Help us clean up the data so that it can be used in research, teaching and civic hacking.

Currently under inspection: