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5. Rooftop collection and filtration systems. 13. The plan will minimize total impervious area of a development by one or a combination of the following: 1. Locating parking areas beneath buildings, 2. Minimizing builduag footprints by adding stories, or 3. Using pervious paving materials rather than traditional asphalt and concrete for parking lots, roads, sidewalks, and driveways. (3; The plan will limit the connectedness of impervious surfaces and direct runoff into vegetated landscape areas. This may include sloping driveways, sidewalks and streets to drain runoff to lawns or vegetated swales. D. The plan will include a variety of trees and native plant materials such as Cattails, Blue Flag Iris, Sedge Grass and Common Reed to capture rainfall through. absorption or evaporation and provide roots for infiltration purposes. Screening of Parking Areas. Wherever a parking lot faces street frontage, such frontage shall be screened by a combination of hedges, ornamental railings, walls, bollards, trees, and other methods to screen parking lots from pedestrian spaces while maintaining eye-level visibility. Such screening shall be maintained at a height of between 2-1/2 feet and 3-1/2 feet. Such screening shall meet the setbacks required by the applicable Build-to Line. Overstory trees are allowed within this screening area, as long as the canopy of the tree is at least 7 (seven) feet above the ground to allow open visibility between the parking area and street frontage, under the tree canopy. If plantings are included in this screening area, the area must be a minimum of 6 feet in width to allow adequate rpom for plantings and snow storage. Parking structures. A. Parking structures shall maintain setbacks required for buildings as described in this article. B. Openings in a parking lot structure that face a street or public open space, must be screened with slats, grating, screens, glass, or other architectural treatment to buffer substantially the visual impact of vehicles parked in the structure. 6-720. Building Types. -in the Northwest Quadrant District, Building Types are established. No building shall be constructed occupied except with the land uses and characteristics described herein, on a block or portion of a k, depicted on Figure 3: (]~~ Building Type Al, Mixed Use without Residential or Office on First Floar. 4 ~ A. Building Type Al buildings must include commercial uses on the first floor. B. Building Type Al buildings may include commercial, office or residential uses on the upper floors. C. Residential uses may not be mixed with another use on a given floor. D. Building Type Al may have a flat or pitched roof and shall be 3 to 5 stories in height. Building Type A2, Mixed Use. A. Building Type A2 may include commercial, office or residential uses on the first and upper floors. B. Residential uses may not be mixed with another use on a given floor. C. Building Type A2 may have a flat or pitched roof and shall be 3 to 5 stories in height. Building Type A3, Mixed Use.