N.Y. Gen. Oblig. Law § 5-323

§ 5-323. Agreements exempting building service or maintenance\ncontractors from liability for negligence void and unenforceable. Every\ncovenant, agreement or understanding in or in connection with or\ncollateral to any contract or agreement affecting real property made or\nentered into, whereby or whereunder a contractor exempts himself from\nliability for injuries to person or property caused by or resulting from\nthe negligence of such contractor, his agent, servants or employees, as\na result of work performed or services rendered in connection with the\nconstruction, maintenance and repair of real property or its\nappurtenances, shall be deemed to be void as against public policy and\nwholly unenforceable.\n