105-20 - PROTECTION OF NATURAL FEATURES LAST AMENDED 2/2/2005 All #natural features# within a #Special Natural Area District# shall be protected by the regulations of this Chapter in accordance with the provisions set forth in Sections 105-02 (General Provisions), 105-30 (PRESERVATION OF NATURAL FEATURES) and 105-50 (REGULATIONS FOR PROTECTION OF NATURAL FEATURES). Except for any existing #natural feature# that is unsafe and the removal of which is required by the Department of Buildings to eliminate hazardous conditions, no #natural features# described in Section 105-11 (Description of Natural Features) shall be removed, destroyed or altered unless permitted by certification, authorization or special permit of the City Planning Commission, pursuant to Section 105-40 (SPECIAL REVIEW PROVISIONS), or allowed pursuant to Section 105-021 (Actions not requiring special review).