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City of Arden Hills Planning Commission Meeting for September 7, 2016 P:\Planning\Planning Cases\2016\PC 16-022 - 1500 Arden Place - Variance\Memos_Reports_16-022 Page 4 of 9 The maximum height permitted for accessory structures in residential districts is 15 feet. The proposed accessory building would have a height of 11 feet. D. Lot Coverage – Conforming Properties in the R-1 District are permitted up to 25 percent structure coverage and must maintain a minimum landscape lot area of 65 percent. As proposed, 12.60 percent of the lot area would be covered by structures and 79.71 percent of the lot area would be landscaped. Lot Coverage Proposed R-1 Regulations Square Feet Percent Dwelling 3,152 % Accessory Building 520 % Total Structure 3,672 12.60% Maximum 25% Driveway 1,858 % Sidewalk/Patio 384 0.7% Total Impervious Coverage 5,914 20.29% Maximum 35% Landscape Area 23,232 79.71% Minimum 65% Lot Size 29,146 - E. Floor Area Ratio – Conforming The floor area ratio (FAR) is calculated by dividing the gross square footage of the dwelling by the lot area. In the R-1 District, the maximum FAR permitted is 0.3. The proposed dwelling would have a finished floor area of 2,125 square feet on the main level and 1,763 square feet on the lower level. The total finished square footage would be 3,888 square feet for an FAR of 0.13. F. Tree Preservation A Tree Preservation Plan is required for all new building construction. The applicants have identified 38 significant trees on the property totaling 707 caliper inches. In order to construct the new dwelling, 8 significant trees (106 caliper inches) would be removed. The City’s Tree Preservation Ordinance allows up to 10 percent of the total caliper inches of trees on a site to be removed before mitigation is required. In this case, the permitted removal would be 70.7 caliper inches. Since the proposal includes the removal of more trees than allowed by the Ordinance, replacement tree plantings are required. The mitigation rate is calculated by subtracting the permitted removal from the proposed removal and dividing by two. For this proposal, 17.6 caliper inches of trees would need to be planted. Staff has recommended as condition of approval that the required replacement trees be planted prior to the City issuing a final certificate of occupancy for the dwelling.