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Multi‐Family Residential Regulations Page 28 of 30 i. Any natural vegetation or landscaping that allows direct water infiltration ii. Permeable paving materials designed and engineered to allow direct water infiltration. Any new material not listed in any best practice guides for permeable paving will be evaluated and considered by Community Development Staff and may be permitted with Permitted Adjustment from the JDA. Permeable paving materials shall not count towards more than 20% of the total permeable area requirements. iii. Any material that requires a sheet flow and collection system for water infiltration shall not be considered permeable cover. (f) Design and placement: i. In Town Center, Retail Mixed-Use and Office Mixed-Use Zones, permeable area that is adjacent or visible from the public right-of-way shall be designed in context with the public realm and not interrupt the form of the public realm. An interruption may be considered any design that blocks pedestrian walkability and clear zones, blocks views of entryways and windows, or blocks access to any ingress/egress of a building. ii. In the Neighborhood Transition, Neighborhood, Flex Office or Campus Commercial Zones, any yard or buffer space on site shall be designed in context to the primary building(s) and shall not block views or ingress/egress access to the buildings. 9.6 Open Space Requirements (a) All non-residential development shall provide 4.0 sq.ft. of Private Common Open Space for every 100 sq. ft. of non-residential space or fraction thereof. This standard shall only apply to all site plans two (2) acres in size or larger. (b) All residential development of five (5) attached dwelling units or more, on a single parcel, shall meet the Private Common Open Space standards established in this Section. Table 9-2 establishes the private common open space requirement based on the proposed intensity of residential development. Table 9-2 Private Common Open Space Requirements Residential Density (dwelling units per acre) Private Common Open Space Standard Proposed (area of private common space per dwelling unit) 0 – 4 DU / acre Not required 5 – 19 DU / acre Provide minimum of 160 sf per dwelling unit 20 – 29 DU / acre Provide minimum of 120 sf per dwelling unit 30 – 39 DU / acre Provide minimum of 80 sf per dwelling unit 40 – 79 DU / acre Provide minimum of 60 sf per dwelling unit More than 80 DU / acre Provide minimum of 40 sf per dwelling unit (c) All residential development with seven (7) or more attached units within the TRC shall also meet the Private Personal Open Space standards established in this Section. Table 9-3 establishes the Private Personal Open Space requirement based on the proposed intensity and type of residential development. Live-work units are exempted from Private Personal Open Space requirements.