Nothing in this chapter requires a change in the plans, construction, or designated use of any building on which actual construction was legally begun prior to the effective date of adoption or amendment of the ordinances codified in this title and upon which actual building construction has been diligently carried on. [Ord. FY2016-04 §2, 2015; Ord. 97-09 §2, 1997; Ord. 86-18-O §3, 1986. Formerly §17.36.070].