City Map

The City Map is New York City's official map — the legal record of its streets, parks, and public places, with their widths and grades. It is a foundational layer most property analysis relies on without noticing: street lines, mapped widths, and the wide-street classifications that select rows in the zoning tables all read from it.

Changing the map — mapping a new street, demapping an old one, widening a corridor — is a formal land-use action with public review, and the changes have lot-level consequences: a mapped widening can move the legal street line into what looks like private frontage. The Department of City Planning is the map's custodian.