Permitted land use activities. All residential land uses are permitted in a PDA and any nonresidential land uses, or a mix of residential and nonresidential land uses, will be permitted if the developer can demonstrate that such uses will promote the objectives of the Comprehensive Plan, will contribute to the quality of the proposed development for the area, and will lead to the direct or indirect enhancement of the surrounding neighborhood in terms of open space, safe vehicular and pedestrian traffic movement, parking, maintenance costs, landscaping, preservation of natural features and an improved living environment.