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I appreciate the reply, I hadn't seen these before and I'll do some more research on them.

My initial reaction is how does this address the issue of developing more units in dense urban environments? For example, if we convert all multi family dwellings in LA to CLTs. Housing is more affordable and no residents are being displaced. Now more people want to move to LA. Who builds housing for them?

They would be required for compete over an extremely limited number of SFHs. Unless the CLTs had a provision that every Nth year, they would be torn down and redeveloped for greater density, this sounds like it would cause a city to completely stagnate. That Nth year clause would really go against the non-displacement goal. It could be sustainable if a city had zero growth, but for desirable metro areas that are mostly developed, that is not the case.

Market rents cause healthy turn over. There are other ways to address affordability, such as addressing wage growth, removing density restrictions, or expanding Section 8. Non-profit landlords would just further distort the system by not addressing systemic needs that require capital.