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

(3) provide that
the risk of damage to or destruction to the building on the premises by fire or
other cause or casualty shall be the risk of the purchaser, and any such damage
or destruction shall not excuse such purchaser from paying the price for the
premises nor from performing the other conditions and covenants of the
contract;

(4) require the purchaser
at all times to keep the buildings on the premises insured for the benefit of
the seller in an amount equal to at least the unpaid balance owing under the
contract to the seller;

(5) require
the purchaser to pay all taxes, assessments, and water rents which shall
thereafter be taxed or assessed upon or placed against the
property.

(e) A
certificate shall be issued where the landlord establishes that it is an
organization exempt from taxation under the Federal Internal Revenue Code, and
that it seeks in good faith to recover possession of the housing accommodations
for the immediate and personal use and occupancy as housing accommodations by
members of its staff.