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(34-40.7 Density and dimensional regulations and performance standards.) 3. Planned Development-Residential (PD-R). a. Density. While the district regulations specify upper limits to residential density, density of a planned development may be limited to that which is established in the original residential district or which is consistent and compatible with nearby existing developed areas. b. Calculation of Density. (1) The computation of density shall be based on dwelling units per net acre for the entire site. (2) To compute the number of dwelling units per net acre, fifteen (15) percent of the gross acreage of the parcel shall be deducted and the net acreage divided by the lowest minimum lot size of the underlying residential district. c. Development Phasing. If the sequence of construction of various portions of the development is to occur in stages, then the open space and/or recreational facilities shall be developed, or legally provided for on a final plat, in reasonable proportion to the number of dwelling units intended to be developed during any given stage of construction as approved on a final plat by the city council. Furthermore, at no time during the construction of the project shall the number of constructed dwelling units per acre of developed land exceed the overall density per net acre established by the approved "PD-R" district. d. Nonresidential Uses in "PD-R" Developments. Nonresidential uses are limited to those specifically listed in the residential zoning districts. Such nonresidential uses shall be subject to all requirements for lot area, width, height, yards and setbacks prescribed in the district in which the proposed "PD-R" development is located. e. Common Open Space Requirements. Common open space for "PD-R" developments shall be provided in accordance with the provisions of Article 5, "Supplementary Regulations," Section 34-57.4 of this chapter. f. Perimeter Buffer Requirements. (1) Where a "PD-R" development proposes residential development along the perimeter of the site, which is higher in density than that of an adjacent residentially zoned property, there shall be a minimum thirty (30) foot wide buffer area. The buffer area shall be kept free of buildings or structures and shall be landscaped or protected by natural features so that all higher-density residential buildings are effectively screened from the abutting lower-density residential property. (2) Where a "PD-R" development abuts a commercial or industrial use or district, there shall be a minimum thirty (30) foot wide buffer area. This buffer area shall be permanent and landscaped and/or otherwise provided with screening (Le., sightproof fencing) so as to effectively screen the commercial or industrial use from the "PD-R" development. (34-40.7 Density and dimensional regulations and performance