Last March, PT posted Suite Vancouver – articles by Alan Durning of the Sightline Institute, detailing the history of secondary suites in Vancouver: 

Suite Vancouver: “In-law—and Out-law—Apartments”

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That was followed up by a piece on “Accessory Dwelling Units (ADUs)” in other northwest cities:

Suite Vancouver – 2: “Nothing ADU-ing”

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And then “a survey of what’s happening elsewhere in Cascadia – here comparing Vancouver with other Cascadian cities.”

Suite Vancouver – 3: “ADUs and Don’ts”

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Now the latest:

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Alan Durning takes a hard look at urban housing and sees what many others have missed. Hidden in city regulations is a set of simple but powerful barriers to affordable housing for all. These rules criminalize history’s answers to affordable dwellings: the rooming house, the roommate, the in-law apartment, and the backyard cottage.  …
In Unlocking Home: Three Keys to Affordable Communities, Durning details how to revive inexpensive housing in walkable neighborhoods—at no cost to the public—by striking a few lines from municipal law books. The three keys, Durning argues, are re-legalizing rooming houses, uncapping the number of roommates who may share a dwelling, and welcoming accessory dwellings such as granny flats and garden cottages. If adopted, these keys would reap valuable benefits for cities far and wide.

You can purchase the e-book through Amazon (and in other ebook stores soon), or you can “pay with a tweet or post.”

There’s also an excerpt in Slate: Bring Back Flophouses, Rooming Houses, and Microapartments.