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a. List of project specific land uses. b. Proposed design dimensions including mimmmn yard setbacks. building coverage, minimum lot sizes and/or minimum lot area per unit, minimum lot widths, minimum floor area per unit. and maximum building heights. c. Architectural standards, materials, and other guidelines by architectural (product) type. d. Street design standards - required if proposing to vary from the City Subdivision Ordinance standards and/or for incorporating alley design. 5. The Maintenance Plan. The maintenance plan shall include details for the long- term maintenance of common areas, including landscaping and streetscaping, open space, and other facilities not maintained by the City of Portsmouth. (d) General Design Standards In order ro create the vibrant, interactive, and socially diverse neighborhoods envisioned by the TND Overlay District, the following General Design Standards shall apply: 1. Lots and Buildings a. Neighborhoods should include a mix of housing types and land uses to accommodate a variety of lifestyles and income levels within a well- designed system of public, private, and commemial areas. b. A minimum of 40% of all dwelling units shall be single family detached. c. All buildings, except accessory structures, shall have their main entrance opening onto a street or square. Minimal front setbacks are encouraged to create a socially interactive, pedestrian-friendly environmental along streets and sidewalks. d. Expanses of blank walls without windows, doors, or other architectural elements along street rights-of-way should be avoided to the greatest extent possible. e. Stoops, open colonnades, balconies, and open porches may encroach up to eight feet into the front setbacks, as established in the Design Guidelines. In no instance shall encroachments extend within five feet of the right-of-way line. f. Lots designated as squares, parks, or other amenities shall have at least 75% of their perimeter abutting street rights-of-way.