I just remembered a housing model that is a bit famous in Germany and that could be adapted for the Reef 2.0. Advantage: the Reef 2.0 organization would outright own the building from the start, not having to leave an “upcycled” house after 10 years or something. And the organizational form protects the building from ever being sold again to a profit-maximizing investor.
This model is called Housing Syndicate (“Mietshäuser Syndikat” in German). See their website, an outline of the organizational model and esp. their section about international projects.