An RB-1 district is intended to provide a mix of residential uses with certain specified business, personal and professional services. It is also intended to serve as a buffer between high intensity commercial and lower density residential uses. The regulations and restrictions in an RB-1 district are intended to protect and preserve residential uses while permitting business uses characterized principally by professional and consultive services or executive and administrative offices, compatible with single-family residential development. To this extent, nonresidential structures should be limited in total gross floor area per lot in order to minimize the impact of bulk and scale to residential neighborhoods. (Ord. 710 § 19, 1996; Ord. 573 § 2, 1990).