N.Y. Multiple Dwelling Law § 10

§ 10. Time for compliance. All alterations required by this chapter\nupon dwellings erected before its adoption by or application to any\ncity, town or village, in whole or in part, shall, unless specifically\nprovided otherwise in this chapter, be made not later than five years\nafter such adoption or application, or at such earlier date as may be\ndeemed necessary by the department in order to remove a condition\ndangerous or detrimental to life or health.\n