SB827 housing density limits

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1	SB 827 housing density limits
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3	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.
4	from Tim McCormick / YIMBYwiki. 2018-02-08. See more information about bill at:						http://www.yimby.wiki/wiki/SB827
5	short link:	http://bit.ly/SB827-housing-density
6									The variables described below, in highlighted cells, can be changed to alter assumptions!
7		Lot coverage max[1]	Building height limit						[1]. Lot coverage ratio: % of land parcel which can be built on.
8		0.75	No Density Bonus			with Density Bonus[2]			[2] extra heights permitted by Density Bonus, from SF Planning SB827 analysis, Feb 5:
9			45	55	85	65	75	105	http://commissions.sfplanning.org/cpcpackets/SB%20827.pdf
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11		avg ft/floor[3]	10						[3] average vertical feet per floor.
12		commercial floors[4]	0						[4] how many non-residential floors, e.g. ground-floor retail
13		residential floors:	4	5	8	6	7	10
14		bldg efficiency[5]	0.7						[5] building efficiency: % of building floor area that is dwelling unit private area.
15									i.e. this excludes common areas like structure, utilities, stairs, corridors.
16	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 %.
17	2500	1875	5250	6562.5	10500	7875	9187.5	13125
18		avg unit size	maximum number of units						Note: this analysis assumes no stepbacks, i.e. the building is same area on every floor.
19		800	6	8	13	9	11	16	To incorporate effect of setback, you can reduce the Lot Coverage %.
20		500	10	13	21	15	18	26
21		150	35	43	70	52	61	87	150sf - this is the minimum "efficiency unit" allowed in CA state law, for cities that
22									have approved it - which includes SF, Oakland, and San Jose.
23	6000	4500	12600	15750	25200	18900	22050	31500
24		avg unit size	maximum number of units						Lot sizes: 2500 square feet is a typical San Francisco residential lot.
25		800	15	19	31	23	27	39	6000 square feet is a typical Bay Area suburban residential lot.
26		500	25	31	50	37	44	63	13000 square feet might be a typical commercial property, and was the example used
27		150	84	105	168	126	147	210	in a discussion thread on this subject in SF YIMBY forum (Slack).
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29	13000	9750	27300	34125	54600	40950	47775	68250
30		avg unit size	maximum number of units
31		800	34	42	68	51	59	85
32		500	54	68	109	81	95	136
33		150	182	227	364	273	318	455
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