(a)        The provisions of Article I, Chapter 5 (Residential Conversion Within Existing Buildings) shall not apply in Special Mixed Use Districts, except as expressly set forth herein.

In Special Mixed Use Districts, in any community district in the City, the conversion to residences of non-residential portions of buildings, in existence on or prior to December 10, 1997, shall be permitted subject to Sections 15-11, 15-12 and 15-30, paragraph (b).

Uses in buildings in existence on or prior to December 10, 1997, containing both residential and non-residential uses, shall not be subject to the provisions of Section 123-31 (Provisions Regulating Location of Uses in Mixed Use Buildings).

For the purposes of applying paragraph (a) of Section 15-111 to Special Mixed Use Districts where the designated Residence District is an R3 District, the minimum floor area per dwelling unit applicable to R4 Districts shall apply.

(b)        The conversion to residences of non-residential portions of buildings constructed after December 10, 1997, shall comply with the special bulk regulations of this Chapter for new residential development.