'apartment-house syndicate', abbreviated to MHS) is a cooperative, non-commercial joint venture in Germany that helps communities acquire long-term affordable living space via a legal, collective property arrangement.

As of June 2024, there are 191 Hausprojekte (intentional communities of a roughly housing cooperative form) within the MHS, with 22 further initiatives looking for suitable property.

[6] A group of people wishing to create a Hausprojekt within the MHS first form a legal association for their future living collective called a Hausverein (lit.

'House association') using the Verein form (abbreviated e. V.)[7]: 349  This provides a legal basis for their collective organization and financing and is a requirement for joining the MHS.

Further requirements include accepting a legal obligation to contribute to the MHS solidarity fund and a commitment to provide mutual aid to other Hausprojekte in future.

[8]: 1  The MHS holds general assemblies 3 or 4 times a year at which point Hausprojekte and their respective Hausvereine are considered for membership.

The Haus GmbH owns the future property the living collective will inhabit and effectively ensures it will not be reprivatized.

[13] An academic article claimed it is a means to reduce poverty and social inequality,[14] supported by a report from BTU Cottbus which states that MHS projects pay significantly less rent than average.

[17] Judith Very finds the MHS to be a functioning combination of anarchist, direct democratic and Marxist approaches that has situated itself alongside the dominant perception of a "uniform capitalism".

[22] There are risks for possibles investors: to finance the projects, a significant deposit is necessary which the Hausvereine and Haus-GmbH typically don't have.

The MHS informs about one case of insolvency in 2010 on its homepage, and advises distributing larger loans across multiple projects to reduce risk.

Due to previously noticed Nazi-related graffiti, state security and the criminal court of Berlin took up the investigation.