With last week's post on affordable housing I was wondering: if we did build out all the Somerville lots zoned for four stories (MR4) to be seven stories of affordable housing, how much housing would that be? I count 254 lots zoned MR4 with a total area of 1.8M sqft. Built out at seven stories and an average of 80% coverage that's 10M sqft of housing. Figure 10% for stairs, elevators, and hallways, and it's really 9M for units. Let's say you build:
| bedrooms | portion of construction | unit size |
|---|---|---|
| 2br | 25% | 850 sqft |
| 3br | 25% | 1000 sqft |
| 4br | 25% | 1100 sqft |
| 5br | 25% | 1200 sqft |
Then building all of this would give you:
| bedrooms | number of units |
|---|---|
| 2br | 2230 |
| 3br | 2230 |
| 4br | 2230 |
| 5br | 2230 |
These properties currently comprise just under 1k units, so this is 7.9k new units of affordable housing and 1k units converted to affordable housing. This would bring Somerville from ~35k units to ~43k.
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