N.Y. Multiple Residence Law § 10

§ 10. Dwellings damaged. If an old or other existing multiple dwelling\nbe damaged by fire or other cause to the extent of two-thirds or more of\nits value at the time of such damage exclusive of the value of the\nfoundation, such dwelling shall not be repaired or rebuilt except in\nconformity with the provisions of this chapter relative to new multiple\ndwellings.\n