Mietshäuser Syndikat (MHS)

The legal architecture binding the Mietshäuser Syndikat, a German federation of 191 housing collectives serving over 3,800 residents, with a two-entity structure (resident association + property LLC) that contains a built-in veto preventing any project from ever being re-privatized.

The Mietshäuser Syndikat (MHS) is a German federation of housing collectives, founded in 1992 in Freiburg im Breisgau by former squatters of the Grether Project, an occupied factory in the city. As of June 2024 there are 191 Hausprojekte (intentional housing communities) inside the MHS, with 22 more in formation. The federation covers over 150,000 square meters of living space and houses more than 3,800 residents.

The constitutional architecture has two layers and three principles.

The two-layer architecture is the core innovation:

1. Each housing collective forms a Hausverein (House Association), a German legal Verein (e.V.), which is the social and decision-making body of the residents. The Hausverein decides who lives there, how rent is set, how the building is used, how conflicts are handled, all the daily-life questions.

2. Each housing collective also forms a Haus GmbH (House LLC), a German limited-liability company that owns the property. The Haus GmbH has two shareholders: the Hausverein (the residents, with near-total voting authority on use and development) and the MHS itself (the federation, with voting rights limited to a single domain).

The MHS shareholder vote is restricted to decisions affecting sale or legal transfer of the property and changes to the Haus GmbH articles of organization. On those topics, both shareholders must consent. The MHS uses its veto, by design, to block any attempt at re-privatization. This means that once a building enters the Syndikat, it cannot return to the commercial real estate market.

The three principles the MHS has built itself on:

• Shared ownership. Property is held collectively, not individually.
• Self-organization. Each Hausverein decides its own life. The MHS does not impose internal rules.
• Solidarity. Older projects pay a solidarity contribution into a federation fund that helps newer projects acquire property.

Comparable cases in this Library:

• The Federation of Egalitarian Communities (FEC) is structurally similar in that it is a federation of communities with shared principles, but the FEC governs income-sharing communities while MHS governs housing.
• Earthaven's federated neighborhood structure is similar in that decision rights and ownership are layered, but Earthaven federates within one ecovillage while MHS federates across hundreds of separate buildings.
• Twin Oaks publishes its bylaws as a single corporate body; MHS distributes the equivalent across two legal entities per project plus a federation.

For a researcher, MHS is the case where a federated legal architecture has solved the problem that defeats most cooperative housing projects: how to prevent the next generation of residents from selling the building. The MHS does it through a co-shareholding structure with a single, narrow, perpetual veto.

Living examples and entry points for community builders

If your community is trying to hold housing out of the speculative market permanently, the Mietshäuser Syndikat is the most developed working model of how to do that at scale.

The Syndikat now includes more than 170 house projects across German-speaking Europe. Each project is legally autonomous, run by the people who live there. But each project's GmbH (the German LLC equivalent) includes two shareholders: the residents' association and the Syndikat itself. The Syndikat holds one vote, and that vote exists for one purpose only: to block resale. The housing cannot be sold on the open market. Ever. The solidarity fund, built from small contributions from each project, finances the next project's startup costs. The model is self-reinforcing.

In Freiburg, where the Syndikat originated, several of the oldest projects have been running for more than twenty years. Berlin has a significant cluster of projects across different neighborhoods, ranging from small apartment buildings to larger collective houses. Mietshäuser Syndikat Austria operates as a parallel structure adapted to Austrian law, which required rethinking some of the GmbH mechanics but preserved the core principle.

For adjacent models operating in English-speaking contexts, the UK Community Land Trust Network has developed a body of practice for permanently affordable housing that draws on different legal tools but similar values. Champlain Housing Trust in Vermont is one of the longest-running community land trusts in the US and has published extensively on its model. Cahoots in Scotland works with housing co-ops in a way that shares some of the solidarity logic, though the legal structure is different.

Where the door is:

• The Mietshäuser Syndikat website has substantial documentation in German, and some materials in English. If you read German, the annual gathering (Kennenlerntreffen) is where new groups connect with established projects and start the formal process of joining the network.
• For English-language adaptation, the UK CLT Network is the most accessible starting point. They have published guides on setting up community land trusts in the UK context.
• Before engaging with the legal structure, ask your group one foundational question: do you want this housing to remain permanently affordable and community-controlled, or do you want the option to sell at some point? The Syndikat model answers that question definitively. It is not the right structure for groups who want flexibility later.
• Talk to people who are already running a Syndikat project. The model is documented, but the social dynamics of running an autonomous house inside a solidarity network involve things that do not appear in the legal docs.

One caution worth naming directly: the GmbH veto structure is specific to German corporate law. Adapting this model to another country's legal system is not a matter of translation. It requires rethinking how the solidarity mechanism works within a completely different legal framework. Groups outside German-speaking Europe should treat the Syndikat as a source of design principles, not a template to copy.