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

(iii) a person who purchased the stock
allocated to a housing accommodation which was occupied by a tenant who
obtained his possession from said purchaser of the stock; or

(iv) a person who purchased the stock
allocated to a housing accommodation from an owner of such stock who was in
occupancy of such housing accommodation; or

(v) a person who purchased the stock
allocated to a housing accommodation while it was occupied by a tenant and
which thereafter became vacant after voluntary removal by the
tenant.

(6) As used
herein, the term housing accommodation shall not include servants' rooms which
are nonhousekeeping and located in the service portion of the building or
apartments not subject to this Subchapter; and the term tenant shall not
include the persons occupying such servants' rooms or apartments not subject to
this Subchapter.

(7) As used
herein, the term stock shall also include other evidence of interest in the
cooperative corporation or association with the right to possession of a
housing accommodation by virtue of a proprietary lease or otherwise.

(8) As used herein, the term cooperative
corporation or association shall also include the sponsor of a cooperative
plan.

(9) Where a cooperative plan
and any amendments thereof presented to the tenants of controlled housing
accommodations is not declared effective and filed with the local rent office
pursuant to subparagraphs (ii) and (iii) of paragraph (3) of this subdivision,
a period of 18 months from the date of the presentation of the first plan must
elapse before another cooperative plan may be presented to the tenants of the
structure.