Notwithstanding any minimum building site area, minimum front, side or rear yard, or parking requirements to the contrary, alternative development regulations may be established in the C-R, C-1, and C-2 districts for a planned development on a total site area of not less than one-half acre, subject to the approval of a general development plan for said area as described and following procedures described in Chapter 17.26. Within said planned development area a general development plan may establish alternative individual building site areas, yard requirements, and parking requirements, all of which may vary from those otherwise required. However, such a plan shall establish alternative setbacks within the boundaries of the general development plan area which shall be landscaped and shall be permanently maintained as open space as follows: (A) setbacks as provided by the front yard requirement of said district abutting any public street frontage, and (B) a minimum ten-foot building setback and perimeter landscape planting strip measured from the boundary of the general development plan area not abutting a public street. Cornices, eaves, canopies, and similar architectural features, and uncovered porches, stairways, fire escapes, or landing places may extend into said open space as shown and clearly defined in general development plan. Also, parking spaces or driveways may encroach up to five feet into said open space not abutting a street as shown and clearly defined in the general development plan. Further, such a plan may establish alternative parking requirements where no individual tenant space constitutes more than twenty-five percent of the total floor area and where there is a mix of residential and commercial uses within said planned development. However, any reduction in the total number of parking spaces which might otherwise be required shall not be reduced to less than one parking space for each four hundred fifty square feet of floor area. The approval of any such general development plan shall be conditioned upon the provision of adequate assurances that said permanent landscaping shall be perpetually maintained and that all parking, with the exception of not more than two parking spaces for each residential unit, shall be made available for shared usage by all uses within the planned development. On planned development sites that abut lands in the same district, the planning commission may require that pedestrian and vehicular circulation facilities be extended from the planned development site to the boundary of general development plan area for connection with existing or future pedestrian and vehicular facilities on such abutting lands, and that provisions are incorporated into the project to ensure that necessary and appropriate cross easements will be obtained. (Ord. 2020-07 § 2, 2020; Ord. 2003-01 § 1, 2003; Ord. 2001-02, 2001)