§ 291-cc. 1. Recording modifications of leases. Where a lease or
memorandum of such lease has been recorded, an unrecorded agreement
modifying such lease or memorandum is void as against a subsequent
purchaser in good faith and for a valuable consideration, and the
possession of the tenant shall not be deemed notice of the modification,
unless the agreement of modification or a memorandum thereof is recorded
prior to the recording of the instrument by which the subsequent
purchaser acquires his estate or interest.

2. A memorandum of an agreement modifying a lease shall contain at
least the following information with respect to the agreement: the names
of the parties and the addresses, if any, set forth in the agreement; a
reference to the agreement with its date of execution; a brief
description of the leased premises in form sufficient to identify the
same; any changes made by the agreement in the term of the lease and the
date of the termination of the lease as modified, and any changes in the
provisions of the lease as to the rights of extension or renewal.

3. For the purpose of this section the word "purchaser" includes a
person who purchases or acquires by exchange or contracts to purchase or
acquire by exchange the leased premises or the real property of which
the leased premises are part or any estate or interest therein, or
acquires by assignment the rent to accrue from tenancies or subtenancies
thereof in existence at the time of the assignment.