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A. Purpose. Section 18.2.5.070 regulates floor area of dwellings to promote compatible building volume and scale in the Historic District.

B. Applicability. Within the Historic District Overlay, new structures and additions shall conform to the maximum permitted floor area standards of this section, except as provided by 18.2.5.070.C.

C. Increases in Allowable MPFA. A Conditional Use Permit under chapter 18.5.4 is required to exceed the MPFA standards of subsections 18.2.5.070.F and 18.2.5.070.G, below. In addition to the approval criteria for a Conditional Use Permit, the criteria for Historic District Design Standards approval must be met. In no case shall the permitted floor area exceed 25 percent of the MPFA.

D. Maximum Permitted Floor Area. For purposes of this section, maximum permitted floor area (MPFA) means the gross floor area of the primary dwelling, including but not limited to potential living spaces within the structure with at least seven feet of head room and attached garages, except as provided by subsection 18.2.5.070.E, below.

E. Exceptions. Basements, detached garages, detached accessory structures, and detached accessory residential units are not counted in the gross floor area for the MPFA calculation if separated from the primary dwelling by six feet or more. Similarly, unenclosed breezeways, and similar open structures connecting an exempt detached structure to the primary dwelling are not counted in the MPFA calculation.

F. Calculation and Standards. Except as modified by subsection 18.2.5.070.G for multiple dwellings on a lot and residential subdivisions proposed under the performance standards option, the following formula shall be used to calculate the MPFA for single family dwellings, provided however, that regardless of lot size, the MPFA shall not exceed 3,249 square feet:

Lot area x Adj. Factor [from Table 18.2.5.070(E)] = Adjusted lot area x 0.38 FAR = MPFA

Table 18.2.5.070.E. Adjustment Factor Table

Lot Area

Adj. Factor

Lot Area

Adj. Factor

Lot Area

Adj. Factor

Lot Area

Adj. Factor

0 – 2500

1.20

6501 - 7000

0.88

11001 – 11500

0.66

15501 - 16000

0.55

2501 – 3000

1.16

7001 - 7500

0.85

11501 – 12000

0.64

16001 - 16500

0.54

3001 – 3500

1.12

7501 - 8000

0.82

12001 – 12500

0.62

16501 - 17000

0.53

3501 – 4000

1.08

8001 - 8500

0.79

12501 – 13000

0.61

17001 - 17500

0.52

4001 – 4500

1.04

8501 - 9000

0.77

13001 – 13500

0.60

17501 - 18000

0.51

4501 – 5000

1.00

9001 - 9500

0.75

13501 – 14000

0.59

18001 - 18500

0.50

5001 – 5500

0.97

9501 - 10000

0.73

14001 – 14500

0.58

18501 - 19000

0.49

5501 – 6000

0.94

10001 - 10500

0.71

14501 – 15000

0.57

19001 - 19500

0.48

6001 – 6500

0.91

10501 - 11000

0.68

15001 – 15500

0.56

19500 and greater

0.47

G. Multiple Dwellings and Residential Performance Standards Option. Where multiple dwellings are proposed on a single lot, or where a residential subdivision is proposed under the Performance Standards Option of chapter 18.3.9, the MPFA shall be determined using the following formula:

Lot area x Adj. Factor [from Table 18.2.5.070(E)] = Adjusted lot area x Graduated FAR [from Table 18.2.5.070(F)] = MPFA

Table 18.2.5.070.F. Graduated FAR Table

# units

FAR

# units

FAR

# units

FAR

1

0.38

5

0.46

9

0.54

2

0.4

6

0.48

10

0.56

3

0.42

7

0.5

11

0.58

4

0.44

8

0.52

>11

0.6

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