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Maryland Association for Supportive Housing (MASH) historically known as Baltimore Area Association for Supportive Housing (BAASH) is a 501 (c) 3 not-for-profit organization, Headquartered in Baltimore, Maryland. MASH has been in existence since 2005. The organization is an association of professionals who manage, own, operate or provide goods and services to the Supportive Housing Community in the state of Maryland.