Baugruppen Housing Model
= "basically collectives formed with the intent of building housing — but eliminating the developer in order to keep costs down significantly".
"Baugruppen fall somewhere between a communal home and a condo association. As Eliason noted, an intentional community drives the model and is the common denominator. Beyond that, though, baugruppen become whatever each group needs and wants from their housing project. One group may develop stand-alone units situated around a common space; another group might prefer a single building divvied up to fit their needs. Baugruppen are scaleable and malleable — two qualities key to the model's appeal.
Apparently, Germany is all over the baugruppen idea, even going so far in some districts as to ensure that public policy is not a hindrance. " (http://www.shareable.net/blog/baugruppen-germanys-sustainable-community-housing-model?)