N.Y. Real Prop. Acts. Law § 235-i

§ 235-i. Unreasonable tenant fees for reproductions of keys. A\nlandlord shall not charge a tenant a fee for the reproduction of keys to\na single dwelling greater than one hundred ten percent of the actual\ncost of reproduction, provided such limitation shall not apply if a\ntenant requires the reproduction of keys for a single dwelling more than\nthree times in a calendar year.\n