Housing for non-profit workers does not seem to be represented in this paper, but union housing, or permanently affordable housing is. And hence, I suggest worth reading.
The paper from 1996 usefully describes experiences with Community Land Trusts in urban areas and Mutual Homes Association (which I have loved since discovering Richmond’s successful Atchison Village).
This paper brings context to those working on a “third sector” (not public housing, or for-profit housing).
I liked this paper because it gave real examples of success and failures and tried to draw conclusions and trends. Unfortunately, most of the groups they studied were under 10 years old. I hope they update this study, or if anyone knows of an update, I would like to see it. Unvarnished experience is valuable.