Wherever a lawfully existing building or other structure otherwise conforms to the use regulations of the district in which it is located, but is non-conforming only in the particular manner herein specified, the building and use thereof shall be exempt from the requirements of §§ 159.143 and 159.144 of this chapter. This section does not nullify the requirements of § 159.145, where a nonconforming building or structure is damaged or destroyed.
(A) In any residential district where a dwelling is non-conforming only as to the number of dwelling units it contains, provided no such building shall be altered in any way so as to increase the number of dwelling units therein;
(B) In any residential district where a use permitted in the B-1 District occupies ground floor space within a multiple family dwelling located on a corner lot;
(C) In any business or manufacturing district, where the use is less distant from a residence district than that specified in the regulations for the district in which it is located; and
(D) In any district where an established building, structure, or use is non-conforming with respect to the standards prescribed herein for any of the following:
(1) Floor area ratio (FAR);
(2) Lot area per dwelling unit;
(3) Yards, front, side, rear, or transitional;
(4) Off-street parking and loading;
(5) Lot area;
(6) Building height; and
(7) Gross floor area.