9 NYCRR § 2104.5 — Occupancy by landlord or immediate family (State Rent & Eviction Regs., via Cornell LII)

(iii) Within 10 days from the date of service
of the notice provided by subparagraph (ii) the cooperative had filed with the
local rent office having jurisdiction a copy of the cooperative plan; a copy of
the first notice served upon all tenants of controlled housing accommodations;
a copy of the notice required by subparagraph (ii), and a statement, duly
verified by an officer of the cooperative and where the sale was made on or
after July 1, 1955, a statement duly verified by each purchaser, that the sales
had been made in good faith pursuant to the terms set forth in the cooperative
plan without fraud or duress and with no discriminatory repurchase agreement or
other discriminatory inducement and whether for personal occupancy by the
purchaser. A duplicate set of the above specified papers shall also be kept
available in the building for inspection by a tenant of controlled housing
accommodations or his authorized representative.

(iv) In the event that the stock allocated to
a controlled housing accommodation shall be offered for sale by the
cooperative, its sponsor, nominees or other persons associated with the
formulation of the plan to a purchaser in good faith for his personal occupancy
at terms more favorable than those previously offered to the tenant of such
controlled housing accommodation, the latter must first be given a written
notice of the new terms and 15 days within which to elect to purchase stock at
such new terms.