This article says it's "an unusual experiment", but how is this different from an SRO?

http://www.ccsroc.net/s-r-o-hotels-in-san-francisco/

Description from this article of the "experiment": "Shared bathrooms at the end of the hall and having no individual kitchen or living room".

Description from the SRO web site link above: "A typical S.R.O. is a single eight (8) x ten (10) foot room with shared toilets and showers down the hallway."

As the SRO web site points out, these have been around in San Francisco "throughout the city’s history".