52-44 - Non-Conforming Residential Uses in M1 Districts LAST AMENDED 12/5/2024 In an M1 District, a #non-conforming# #residential use# occupying at least 50 percent of the #floor area# of a #building# which was #designed for residential use# and erected prior to December 15, 1961, may be #extended# on the ground floor level provided that no #dwelling unit# or #rooming unit# may be located on or below a #story# occupied by a #commercial# or #manufacturing# #use#. The total number of #dwelling units# shall be that which would be permitted through the provisions of Section 23-50 (DENSITY REGULATIONS), inclusive, in accordance with the applicable geography.