(a) Official interpretations of general applicability with respect to the provisions of the Rent Law or these regulations shall be issued only by the administrator. No interpretation shall be given in response to any hypothetical question.

(b) Any person desiring an opinion, as to the applicability of the Rent Law or these regulations to a specific factual situation, shall make a request in writing for such opinion to the district rent administrator for the locality within which the housing accommodations involved are situated. Such request shall set forth in full the facts out of which the question arises, and shall state the name and post-office address of the person or persons making the request and the location of the housing accommodations involved. If there is a pending or closed proceeding in the particular office, or if the inquirer has previously requested an opinion of the same or substantially the same facts, his request shall so indicate. No opinion shall be given in response to any hypothetical question.

(c) Any opinion or official interpretation shall remain in full force and effect unless and until revoked or modified in writing by the official issuing it or by the administrator.