When a new dwelling is constructed, or a main building is structurally altered or the use is substantially changed, the minimum number of off-street parking spaces to be provided on the lot shall be as indicated in Larkspur Municipal Code Chapter 18.56. (Ord. 1030 § 2(12), 2018; Ord. 953 § 1(33), 2007; Ord. 313 § 2, 1965; Ord. 295 § 89, 1962)