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The average allowed density in the City of Mercer Island is more than 6.2 dwelling units per acre. This figure is based on the proportional acreage of each land use designation (or zones) that allows residential development, the densities permitted under the regulations in place today for that zone, and an assumption that the average practical allowed density for the Town Center is 99.16 units per acre. Since there is no maximum density in the Town Center and density is controlled instead by height limits and other requirements, the figure of 99.16 units per acre represents the overall achieved net density of the mixed-use projects in the Town Center constructed since 2006.

Table 4 – 2010-2030 Housing Unit and Population Forecast

Year

Overall Household Size

SFR Units

Multi-family Units

Total Increase in units per decade

Total Housing Units

Population

2010 (Census)

2.48

6,873

2,236

N/A

9,109

22,699

2020 (Forecast)

2.54

7,201

2,257

349

9,458

24,991

2030 (Forecast)

2.53

7,349

2,266

157

9,615

25,243

2010 household size data obtained from the 2010 Census. All other data is from PSRC, using their 2013 Forecast parcel-based land use model using Urban Sim.