The percentage of each parcel that must remain in its natural state, or otherwise be permeable, shall be a minimum of twenty-five (25) percent plus the percentage figure of average slope as calculated in Larkspur Municipal Code Section 18.34.030, not to exceed a maximum of ninety (90) percent. Example: A parcel with an average slope of twenty (20) percent would require in natural state twenty-five (25) percent plus the slope percentage figure (twenty (20) percent) for a total natural state requirement of forty-five (45) percent. In addition, no development shall exceed the maximum building coverage allowed in the applicable Residential Zoning District except in clustering where the total area of the project shall be used in calculating coverage. In a legal nonconforming lot, the natural state requirement shall not exceed seventy (70) percent. Additions constructed pursuant to Larkspur Municipal Code Section 18.35.030(C) may exceed the minimum natural state requirement. (Ord. 1030 § 2(12), 2018; Ord. 953 § 1(41), 2007; Ord. 934 § 2, 2004; Ord. 471 § 1 (part), 1973)