§ 151.56 USES REQUIRING SITE PLAN REVIEW.
   (A)   A detached single-family dwelling on a lot or parcel not having any other dwelling existing or to be located thereon or a two-family dwelling existing on a lot or parcel not having any other dwelling existing or to be located thereon does not require site plan review.
   (B)   All land uses shall be subject to site plan approval if any one or more of the following minimum standards are met:
      (1)   Any use requiring four or more parking spaces;
      (2)   The land being developed is two acres or more;
      (3)   The building being constructed consists of 2,500 square feet or larger;
      (4)   The proposed structure, use or land to be developed will abut an existing residential district.
(1990 Code, § 5.372)