Notwithstanding the limitation in subsection 10.4.1 above, a nonconforming lot that exists prior to the effective date of this Ordinance or was approved by Wake County as a buildable lot prior to annexation in to the Town of Cary, may be used for a single-unit dwelling, provided that:
(A) The lot is located in a residential district in which dwellings are permitted; and
(B) The proposed dwelling can meet all the required setbacks for the district; and
(C) No new dwelling unit may be added to a nonconforming lot that already has one (1) or more individual dwelling units.