(a)        The underlying zoning districts shall be deemed to be integral parts of the Special Midtown District. If the underlying zoning district of any zoning lot shall be amended or shall be nullified by any court of competent jurisdiction, such amendment or adjudication shall be construed to amend the Special Midtown District to remove such zoning lot from the Special Midtown District whereupon the regulations of the prior underlying district shall apply.

(b)        The bulk regulations contained in Sections 81-20 through 81-28, inclusive, shall be deemed to be an integral unit and no modification thereof shall be permitted, except in accordance with the provisions of Section 200 of the New York City Charter. If any sentence, clause, paragraph or part of Sections 81-20 through 81-28, inclusive, shall be adjudged by any court of competent jurisdiction to be invalid, such judgment shall not be confined in its operation to the sentence, clause, paragraph or part thereof directly involved in the controversy in which such judgment shall have been rendered, but shall also be construed to invalidate and prohibit the application of the remainder of Sections 81-20 through 81-28, inclusive. However, any such judgment shall not act to invalidate any other sentence, paragraph, clause, section or chapter of the Zoning Resolution.