(3) April 1, 1984, for complaints filed on or before March 31, 1988 for housing accommodations for which initial registrations were required to be filed by June 30, 1984, and for which a timely challenge was not filed.
(g) Vacancy lease.
The first lease or rental agreement for a housing accommodation that is entered into between an owner and a tenant.
(h) Renewal lease.
Any extension of a tenant's lawful occupancy of a housing accommodation pursuant to section 2523.5 of this Title.
(i) Owner.
A fee owner, lessor, sublessor, assignee, net lessee, or a proprietary lessee of a housing accommodation in a structure or premises owned by a cooperative corporation or association, or an owner of a condominium unit of the sponsor of such cooperative corporation or association or condominium development, or any other person or entity receiving or entitled to receive rent for the use or occupation of any housing accommodation, or an agent of any of the foregoing, but such agent shall only commence a proceeding pursuant to section 2524.5 of this Title, in the name of such foregoing principals. Any separate entity that is owned, in whole or in part, by an entity that is considered an owner pursuant to this subdivision, and which provides only utility services shall itself not be considered an owner pursuant to this subdivision. Except as is otherwise provided in sections 2522.3 and 2526.1(f) of this Title, a court-appointed receiver shall be considered an owner pursuant to this subdivision.
(j) Permanent tenant.