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density pursuant to SDC 21.07.050C. For example, a residential development that requires six affordable housing units would calculate the affordable housing units to be equivalent to three dwelling units for the purpose of calculating allocated residential density pursuant to SDC 21.07.050C. Affordable housing units built for the purposes of increasing site density above the allocated residential density shall be counted as one dwelling unit for the purposes of calculating maximum residential density pursuant to SDC 21.07.050C.
4. Alternative Calculation of Affordability.
An applicant may propose alternative affordability levels for the affordable housing units. The percentage of required affordable units and the ratio of bonus units (or bonus floor area) per affordable housing unit for alternative affordability levels will be as follows:
ALTERNATIVE CALCULATION
Affordability Level
Percent Affordable Units for Baseline Requirement
Residential Bonus Units to Affordable Units Ratio
3. Residential Bonus Units/Additional Affordable Housing.
50% of median income 60% of median income 70% of median income 80% of median income
4% 5%
3.3 to 1 3.2 to 1 3.1 to 1
The Town Center Plan includes the allocation of 344 residential bonus units (427 total units once the discounted affordable housing units are added per subsection 2. of this section) specified in SDC 21.07.050D. Allocation of residential bonus units is based on the following criteria: An individual project can receive three residential bonus units for each affordable housing unit provided above the minimum 10 percent required pursuant to this section. The affordable housing units will have occupancy requirements and affordability levels as defined in SDC 21.07.050D. Example: If a property has a base density of 50 units, and an applicant requested nine residential bonus units, three of the bonus residential units would have to be affordable units. The development would have a total of 59 units of which eight would be affordable units (five affordable units of the base 50 units, plus three of the nine bonus residential units).
6.5% 10%
3 to 1
Note: Depending on the level of affordability provided, the affordable housing units may not be eligible for the impact fee waivers described in Chapter 21.08 SMC.
5. Rounding.
For developments with more than 10 residential units, the number of required affordable housing units is determined by rounding fractional numbers up to the nearest whole number from one-half.
6. Minimum Threshold.
For any residential development consisting of less than 10 units, the affordability requirements may be satisfied through the payment to the City of an in-lieu fee. a. Amount. The in-lieu fee to be paid for each affordable dwelling unit shall be determined by the director and
556 | Title 21: Sammamish Development Code
Effective | January 1, 2022
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