The city of Portland is already building upon the historic work of the Residential Infill Project, approved by the city in August 2021, with a new slate of zoning changes dubbed the ‘Residential Infill Project – Part 2.”

“Portland City Council unanimously approved a bevy of alternative housing developments that they say will provide lower-cost options and increase housing density within city limits,” reports Jayati Ramakrishan in a paywalled article for The Oregonian.
The changes to the city’s historic “Residential Infill Project,” approved in August 2021, allow new forms of housing on residential parcels previously zoned for a single-family detached house. “The new rules permit new types of housing, and set new, more flexible rules for how the homes can be configured and how large they can be,” according to Ramakrishan.
More details about the Residential Infill Project – Part 2 (RIP2) is available on the city of Portland’s website. “RIP2 was unanimously approved by City Council and will expand housing opportunities in Portland’s very low density R10 and R20 zones, add allowances for attached houses and cottage clusters across all neighborhoods, and increase options for homeownership,” according to the website.
FULL STORY: Coming soon to Portland neighborhoods: more townhomes, six-plexes and other high-density housing

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City of Albany
UCLA Lewis Center for Regional Policy Studies
Mpact (formerly Rail~Volution)
Chaddick Institute at DePaul University
City of Piedmont, CA
Great Falls Development Authority, Inc.
HUDs Office of Policy Development and Research