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Mass Association of Housing Cooperatives Protecting Coop Housing Solving Problems and Expanding Opportunities Massachusetts Association of Housing CooperativesPO Box 230297Astor StationBoston MA 02123 Email infomasshousing. coop Phone 6178070878 Welcome. The Massachusetts Association of Housing Cooperatives is an organization of Massachusetts housing cooperatives providers of resources and assistance to coops policy makers housing advocates and individuals and organizations that embrace the principles of Cooperative enterprises. We work to support a wide variety of existing housing coops and promote the establishment of new housing cooperatives.