(a) Except as otherwise specifically provided by these regulations, every landlord of housing accommodations rented or offered for rent shall file a written statement, on the form provided therefor, containing such information as the administrator may require, to be known as a registration statement, unless a registration statement was filed under the Federal Act or the State Rent Act, or unless the maximum rent for such housing accommodations is required, by section 2201.1(d) or (e) of this Title, to be fixed or established by the administrator.

(b) Notwithstanding subdivision (a) of this section, every landlord of a building or property containing dwelling units subject to title YY of the New York City Administrative Code, and housing accommodations subject to these regulations, shall file a registration statement, no later than September 21, 1984, for each housing accommodation subject to these regulations, on a form prescribed by the administrator containing such information as the administrator may require.

(c) Every landlord, of a building or property in which all residential units are subject to these regulations on April 1, 1984, but thereafter one or more of said residential units becomes subject to title YY of the New York City Administrative Code, shall file a registration statement for each residential unit which remains subject to these regulations by September 21, 1984, or within 90 days from the date the first residential unit becomes subject to title YY of the New York City Administrative Code, whichever is later, on a form prescribed by the administrator containing such information as the administrator may require.

(d) The registration required in subdivisions (b) and (c) of this section shall not establish the legal maximum rent unless an order setting forth the legal maximum rent is issued by the Division of Housing and Community Renewal.