I found the city of Portland's idea of putting these little houses in backyards of willing homeowners quite intriguing. The idea is that after 5 years of housing homeless people, the property owners could use them for rental income.
https://www.washingtonpost.com/national/portland-pilot-program-puts-homeless-in-residents-backyards/2017/03/17/c22ae848-0b52-11e7-bd19-fd3afa0f7e2a_story.html?utm_term=.82ee55bb0b0a
