A subordinate structure not a portion of a main building nor attached thereto, but located on the same lot as the main building, the use of which is purely incidental to that of the main building, including swimming pools, pool equipment, HVAC equipment, generators, and like equipment. See also Larkspur Municipal Code Sections 18.08.270 and 18.08.560. (Ord. 1030 § 2(12), 2018; Ord. 953 § 1(2), 2007; Ord. 929 § 2, 2004; Ord. 295 § 5(2), 1962)