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105 <br /> b. ENVIRONMENTAL FACTORS: All development shall abide by the <br /> performance standards as articulated in Section 6.4 of the UDO <br /> inclusive. <br /> c. RATIO STANDARDS: All development shall abide by the following <br /> ratio standards: <br /> i. Minimum Percentage of Open Space: 30% or a cumulative <br /> total of 81.6 acres in Districts 1 and 2. <br /> ii. There shall be a minimum of 30 acres of open space in <br /> District 1 or 2. <br /> iii. Maximum Allowable Floor Area Ratio shall be as follows: <br /> 1. District 1: 0.20 or 1,248,000 sq.ft. <br /> 2. District 2: 0.13 or 261,800 sq.ft. <br /> d. ACCESSORY BUILDINGS: Accessory buildings and enclosures <br /> whether attached to or detached, including automatic teller <br /> machines, shall be designed to complement the site architecture <br /> and shall be integrated with the same scale, texture, color and <br /> detailing of adjacent architectural design. <br /> e. BUILDING HEIGHT: Buildings within the development shall abide <br /> by the height limitation(s) established within Section 3.7 Economic <br /> Development Districts — Economic Development Hillsborough <br /> Research and Manufacturing of the UDO. <br /> Under no circumstances may a structure exceed 6 stories in height <br /> through the incorporation of additional front and side yard <br /> setback(s) consistent with the aforementioned section of the UDO. <br /> f. SETBACKS: All development shall abide by the following setback <br /> standards: <br /> i. District 1: <br /> 1. No structure shall be located within 50 ft. of any <br /> external roadway. <br /> 2. No vehicular use area shall be located with 25 ft. of <br /> any external roadway <br /> ii. In District 2: <br /> 1. No structure shall be located within 75 ft. of Old NC <br /> Highway 86. <br /> 2. No vehicular use area shall be located within 50 ft. of <br /> Old NC Highway 86. <br /> iii. In all Districts the following setbacks shall be observed from <br /> internal access roads: <br />