An existing accessory dwelling unit situated on a lot or parcel in the A or R-1 zones shall constitute a violation of this title unless: (1) the unit meets the standards and criteria of Chapter 17.12, and an agreement is recorded; or (2) the accessory dwelling unit qualifies as a permitted nonconforming use and structure under the provisions of Chapter 17.40. No enlargement of habitable space shall be allowed unless the standards and criteria of Chapter 17.12 are met. This shall not apply to maintenance of the unit. (Ord. 2017-01 (part), 2017: Ord. 2003-23 § 2, 2003: Ord. 9717 § 2 (part), 1997: prior code § 7283(G))