If the purchaser is entitled to possession of the property under the terms of the contract, the memorandum must so state. The provisions of article eleven of the tax law shall not be applicable to an executory contract for the sale, purchase or exchange of real property, or memorandum thereof, unless the contract provides that the purchaser is entitled to possession of the property.
An executory contract recorded before the date when the vendor acquired title shall not be deemed recorded as provided in this section as against a person to whom the real property is conveyed or contracted to be sold or exchanged, by a conveyance or contract which is part of the transaction in which the vendor acquired title.
N.Y. Real Prop. Law § 294