Join CHAPA: Membership Benefits of Membership in CHAPA CHAPA is a non-profit agency which serves as the umbrella organization for affordable housing and community planning efforts in Massachusetts. Our diverse membership includes non-profit and for-profit developers, advocates, bankers, property managers, architects, consultants, homeowners, tenants, local planners, foundation and government officials, and others. Ten reasons to join CHAPA: Click here (will open new window) Request Membership Information Or download our membership form (PDF file). Please email us with any questions.