https://www.portland.gov/ppd/zoning-land-use/narrow-lots
Narrow Lots in the R20 through R2.5 zones | Portland.gov
Lots that are less than 32 feet wide are called Narrow Lots.
narrow lotsin ther20
https://sfist.com/2015/12/16/two_narrow_lots_could_soon_be_home/
Two Narrow Hayes Valley Lots Could Soon Be Home To Two Five-Story Developments: SFist
Dec 30, 2018 - The proposed buildings would even come with a sliver of a green roof, for all the (restricted) lounging needs of future tenants.