SB827 housing density limits
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SB 827 housing density limits
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Analyzing the possible maximum number of homes that might be allowed on a given land parcel, under proposed 2018 California bill SB 827, Transit Zoning Bill.
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http://www.yimby.wiki/wiki/SB827
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http://bit.ly/SB827-housing-density
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The variables described below, in highlighted cells, can be changed to alter assumptions!
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Lot coverage max[1]
Building height limit
[1]. Lot coverage ratio: % of land parcel which can be built on.
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0.75
No Density Bonus
with Density Bonus[2]
[2] extra heights permitted by Density Bonus, from SF Planning SB827 analysis, Feb 5:
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4555856575105
http://commissions.sfplanning.org/cpcpackets/SB%20827.pdf
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avg ft/floor[3]10
[3] average vertical feet per floor.
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commercial floors[4]0
[4] how many non-residential floors, e.g. ground-floor retail
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residential floors: 4586710
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bldg efficiency[5]0.7
[5] building efficiency: % of building floor area that is dwelling unit private area.
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i.e. this excludes common areas like structure, utilities, stairs, corridors.
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Lot size (sf)Building footprint[6]
net bldg area (excluding common, structural, utility space)
[6] building footprint: area of building, i.e. lot size x lot coverage max %.
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2500187552506562.51050078759187.513125
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avg unit size
maximum number of units
Note: this analysis assumes no stepbacks, i.e. the building is same area on every floor.
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800681391116
To incorporate effect of setback, you can reduce the Lot Coverage %.
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500101321151826
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150354370526187
150sf - this is the minimum "efficiency unit" allowed in CA state law, for cities that
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have approved it - which includes SF, Oakland, and San Jose.
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60004500126001575025200189002205031500
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avg unit size
maximum number of units
Lot sizes: 2500 square feet is a typical San Francisco residential lot.
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800151931232739
6000 square feet is a typical Bay Area suburban residential lot.
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500253150374463
13000 square feet might be a typical commercial property, and was the example used
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15084105168126147210
in a discussion thread on this subject in SF YIMBY forum (Slack).
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130009750273003412554600409504777568250
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avg unit size
maximum number of units
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800344268515985
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50054681098195136
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150182227364273318455
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