Zoning Districts | District Standards—Density and Dimensions
3. The allowed floor area, which excludes structured or underground parking areas and areas housing mechanical equipment, shall be computed by applying the floor- to-lot area ratio to the project site area specified in SDC 21.04.030.H; 4. The allowed lot coverage shall be computed by dividing the total building footprint area by the total lot area. The total building footprint area is computed by adding the horizontal land area covered by a building or combination of buildings on the subject lot. The total building footprint does not include building eaves of up to 18 inches; for eaves and overhangs greater than 18 inches, that portion of the eaves and overhangs that extends beyond 18 inches shall count toward the building footprint; 5. When calculations other than density calculations result in a fraction, the fraction shall be rounded to the nearest whole number as follows:
i. Fractions of 0.51 or above shall be rounded up; and
ii. Fractions of 0.50 or below shall be rounded down.
b. Subdivisions. For subdivision proposals with density calculations resulting in 10 or more whole units of density before rounding fractions, the fraction may be rounded to the nearest whole number when the fraction is equal to or greater than 0.51. The extra unit achieved by rounding up must be used for an affordable housing unit duplex meeting the requirements of SDC 21.04.040D.2.n., SDC 21.07.100E., and SDC 21.07.100F. For example, a subdivision proposal with a density calculation resulting in 10.51 would yield 10 single- family detached residential units, or 10 single-family detached residential units and one affordable housing unit duplex consisting of two affordable housing units for a total of 12 units. Nothing in this subsection restricts or limits the application of the density bonus provisions found in other sections of the code. c. Short Subdivisions. For subdivision proposals with density calculations resulting in nine or fewer whole units of density before rounding fractions, the fraction may be rounded to the nearest whole number when the fraction is equal to or greater than 0.71. The extra unit achieved by rounding up must be used for an affordable housing unit duplex meeting the requirements of SDC 21.04.040D.2.n., SDC 21.07.100E., and SDC 21.07.100F. For example, a subdivision proposal with a density calculation resulting in 4.71 would yield four single- family detached residential units, or four single-family detached residential units and one affordable housing unit duplex consisting of two affordable housing units
a. Fractions of 0.51 or above shall be rounded up;
b. Fractions of 0.50 or below shall be rounded down; and
c. For the purpose of the application of this part, rounding is based on a fraction that is truncated to two numbers past the decimal point. For example, 2.50823 is truncated to 2.50; and
6. When density calculations result in a fraction:
a. For multifamily and attached dwelling projects located in the R-8, R-12, R-18, NB, CB, or O zone with density calculations resulting in a fraction, the fraction shall be rounded to the nearest whole number as follows:
Errata Revisions | November 17, 2022 Effective | January 1, 2022
204 | Title 21: Sammamish Development Code
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