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Great news for anyone who’s into housing affordability and housing creativity.

SB-9 passed in California. The law allows more housing units to be built on existing lots.

Here’s the formula for turning a single family home into 4 homes (courtesy of the wonderful Alfred Twu).

Alfred Twu @alfred_twu

CA Senate Bill 9 allows up to 4 homes in most single-family zones, regardless of local zoning. You can use #SB9 to split your lot, add a 2nd home to a lot, or both (split lot & have 2 homes on each lot for total of 4). Here's a how-to guide & thread: sites.google.com/view/alfredtwu… 1/

September 17th 2021

178 Retweets791 Likes

The full guide is here.

Anyone who has tried to build cohousing or coliving in California knows that zoning is a huge impediment. It can be very hard to house multiple unrelated people on a single piece of land.

Phil Levin @levin_phil

The blue areas are the only places in the Bay Area where it is legally permissable to build multifamily (aka affordable) housing. Your high rent is a direct result of this exclusionary zoning. belonging.berkeley.edu/single-family-…

December 10th 2020

348 Retweets1,947 Likes

Alfred’s 4-unit formula is now one of the simplest way to make your coliving dreams happen in California cities. If I was starting Radish today, that’s exactly how I would do it.

Here are the steps:

1. Person A buys a single family home

2. Person A splits the lot

3. Person B buys the new lot and builds a home

4. Person C builds an ADU on Person A’s lot (perhaps shared via an LLC or TIC?)

5. Person D builds an ADU on Person B’s lot

And also it makes getting a loan easier. Now banks are just lending to a person (or people) buying a single family home. That’s something that do all day long at low interest rates. No need to deal with exotic commercial loans.

Of course, the details are more complicated. But it allows coliving to happen in a series of small, predictable steps. And makes the "tiny homes on a plot of land" vision much more doable.

Go forth and split those lots.

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