N.Y. Real Property Law § 472
2. "Private transfer fee" means a fee, charge or any portion thereof, required by a private transfer fee obligation and payable, directly or indirectly, upon the transfer of an interest in real property, or payable for the right to make or accept such transfer, regardless of whether the fee or charge is a fixed amount or is determined as a percentage of the value of the property, the purchase price, or other consideration given for the transfer. The following are not private transfer fees for purposes of this section: