{"data":{"id":"us-nyc/n.y.c.-admin.-code-27-731","jurisdiction":"us-nyc","citation":"N.Y.C. Admin. Code § 27-731","heading":"§ 27-731 Alterations.","body":"No building, or part thereof, shall hereafter be altered or rearranged so as to reduce any of the following to less than the required standards prescribed in this subchapter for buildings hereafter erected:\n\n(a) The amount of available natural or artificial light.\n\n(b) The output of devices providing heat to a room.\n\n(c) The outdoor air supply. No additional room shall be created unless made to conform to the requirements of this subchapter except that in basements of one family dwellings existing on January first, nineteen hundred eighty-two and in basements of all other dwellings existing on January first, nineteen hundred forty-eight, the minimum clear ceiling height may be seven feet for the minimum area. In multi-family dwellings, the installation of all new mechanical equipment shall conform to the requirements of article nine of this subchapter except that existing mechanical equipment may be replaced with new equipment of the same kind as previously installed.","path":["New York City Administrative Code","Title 27","Chapter 1: Building Code"],"source_url":"https://files.amlegal.com/pdffiles/NewYorkCity/Admin/XML.zip","current_through":"Local Law 2026/135 (enacted August 31, 2026)","vintage":"","retrieved_at":"2026-09-06T02:48:57Z","sha256":"690957a7373b52ead474b5330e0fa82047e74dba932f346a557d437d1dae85e2","source_id":"us-nyc","stale":false,"prev":"us-nyc/n.y.c.-admin.-code-27-730","next":"us-nyc/n.y.c.-admin.-code-27-732"},"notice":"GroundRules: Original legal text. Not legal advice."}