N.Y.C. Admin. Code § 24-712: § 24-712 Inspections of a facility.

(a) The department, upon providing prior notice, shall have the authority to inspect any facility during normal business hours. However, whenever there is a reason to believe that a facility is in violation of the requirements of this chapter, the department shall be authorized to inspect the facility without prior notice. Any reasonable party who refuses to allow an authorized employee or representative of the department to conduct an inspection of the facility after appropriate credentials are presented shall be in violation of this chapter and shall be subject to the penalties provided in subdivision c of section 24-713 of this chapter.

(b) Within twenty business days of receipt of a written complaint in such form as may be prescribed by the commissioner, alleging a violation of any of the provisions of this chapter, the department shall investigate such complaint and shall inform the complainant of the results of such investigation.