(a) In this district, a single-family dwelling and related accessory structures on a single lot or parcel in existence at the time of the adoption of this Code may be repaired, altered or enlarged in accordance with Chapters 1242, 1248, 1249, or 1251 as determined by the Zoning Inspector.
(b) Construction of a new single-family dwelling on a lot-of-record may be per Chapter 1242 as determined by the Zoning Inspector.