N.Y. Multiple Dwelling Law § 162: Single ownership

§ 162. Single ownership. The owner of any site or plot upon which a

garden-type maisonette dwelling project is proposed to be erected shall

execute and file in the office of the recording officer in the county

where deeds of conveyances are recorded an instrument in writing which

shall declare that, so long as any of the buildings proposed to be

erected remain standing, a conveyance of any part or parts of such

project shall, thereupon, cause all the buildings on such site or plot

to be and become unlawful structures, and any prior certificate of

occupancy issued for such structures shall thereupon become void.

Nothing in this section shall be deemed to prohibit the sale of any part

of such project, provided, however, that the part which is so conveyed

and the remaining part of the project shall be made to comply to all of

the applicable provisions of this chapter.