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Table 33 P ARK NET COST PER DWELLING UNIT Housing Type EDUs! Unit Net Cost! EDU Net Cost! Unit 1 29 3-Bedroom, 1,688 sq. Single-Family, 2,684 Single-Family,5-Bedroom, sq. Ai] Detached Units 1 Multi-Family 0.7056395447 Mobile Home 0.87 5639 5556 Source: EDUs per unit lI0111 Table 22; net cost per EDU from Table 32. 1 avg. 1.20 avg 128 5639 5818 56395639 As with the road impact fees, the park net cost schedule would allow several altemative ways of charging single-family detached units: all single-family units could be charged the same the single-family average shown in the fee schedule; (2) the fees could vary the size of the unit. This last altemative is described more fully below, New development could be assessed on the basis of unit size in several ways, One way would be to create size categories that cOlTespond to the number of bedrooms using the midpoints between the averages, A problem with this approach is that as you cross the size threshold between a two-bedroom and a three bedroom unit, for example, the fee would go up by almost $200 for adding one additional square foot (see Figure 13). 3The equation is y 250 * Ln(x) 1,225, where y is the maximum impact fee for the dwelling unit and x is the floor area of the unit square feet; the R2 is 0.930, the adjusted R2 is 0.896 and the T-statistics are -3.3 for the intercept and 5.2 for the coefficient. COllway\Road and Park Impact Fee 5tudy April! 5, 2003 DRAFT, Page 28 Figure 14 P ARK FEES BY UNIT SIZE To avoid these kinds of threshold effects, park impact fees for single-family units could be assessed using a sliding scale, Regression analysis was used to detemline the curve that best fits the four data points (shown as squares in Figure 14), The resulting semi-logarithmic equation (shown as the dashed line in Figure 14) explains 93 percent of the variance.3 The graphed relationship corresponds with common sense, which suggests that the number of residents per square foot will begin to taper off with very large units, While pemlit clerks cannot be expected to calculate fees at the counter using a logarithmic equation, it is a simple matter to develop a fee schedule using 100 square foot or other intervals, of such a schedule 250 and 500 square foot intervals is shown in Table 34 below, Table 34 SAMPLE VARIABLE PARK FEE SCHEDULE Dwelling Sq. Ft, Fee 750 - I ,000 5469 1,001 - 1,250 5531 1,251 - 1,500 5582 1,50 I - 1.750 5623 1,751 2,0005659 2,001 2,2505690 2,251 - 2,500 5718 2,501 - 3,000 5755 3,001 - 3,5005797 3,501 4,000 5832