> "Neighborhood groups in Seattle have criticized new micro apartment SRO units, arguing that they "harmed community character and provided ... inhumane living conditions; due to these concerns, the city passed regulations that outlawed micro apartment/SRO construction."

Annoying. I lived in a SRO (I just called it a studio apartment with a shared bathroom) for 3.5 years that was run by a co-op apartment building. This was in Seattle. Having a shared bathroom was an annoyance (shared between 4 men - never more than a sentence said to two of them) but I was more than happy to put up with it versus having to deal with roommates. It was also cheaper than having roommates in a variety of houses that I looked at. I had more space than all those rooms for rent I looked at. I often wish I could've kept that kind of housing when I moved to the bay area because everything here is so outlandishly expensive just to get your own bit of space and that housing was so cheap for me.

I lived in two of these in Madison, WI. I'm not sure if was legal, but my landlord rented each bedroom in half a house individually. Four men, one bathroom, beer cans in the shower (Why?), but the bedrooms all locked individually and we weren't mutually responsible for each others' rent.

Second one was a former HoJo parked while awaiting condo conversion. Imagine a hotel room stripped of all furniture, with a single kitchen per floor. Had to wash my dishes in the bathtub, but otherwise it worked for me.

Dorms are essentially that. Not sure why that is illegal and dorms are fine.

EDIT: just looked it up, xenophobia of course. New Yorkers didn't like immigrants living in Manhattan in 1955.

They still exist in many parts of the US, and many of them don't have the kinds of restrictions you mention.

These still exist in San Francisco. In fact one of my junior co-workers lives in one.