N.Y.C. Admin. Code § 28-105.12.3: § 28-105.12.3 Adherence to lot diagram.

All work shall be strictly located in accordance with the lot diagram approved in accordance with this code and no lot or plot shall be changed, increased or diminished in area from that shown on the approved lot diagram, unless and until a revised diagram showing such changes, accompanied by the necessary statement of the owner or applicant, shall have been submitted to and approved by the commissioner.