Local offices for the New York City Department of Buildings are located in each borough, and their contact information can be found on the main Department of Buildings' website. The Department of Buildings in New York City oversees zoning regulations throughout the entire city.
New York City is a municipality with a highly centralized structure, so there are no "local" buildings departments outside of the main Department of Buildings. However, New York City is also divided into five boroughs, which serve as a practical way for the city to distribute resources. The Department of Buildings, like other city agencies, is part of the executive branch of the city's government and is headed by a functionary appointed by the mayor. The closest thing to a local building department in New York City is a local borough branch of this centralized agency.