The 40B Design Handbook is a result of a collaborative process of the four Massachusetts housing agencies that are authorized to review and approve site eligibility for Chapter 40B alfordable housing developments. Subsidizing Agencies, the primary audience for this Handbook, are responsible for determining Site Eligibility. Site Eligibility determinations are typically the first step for a c.40B Project and are completed with the issuance of a Project or Site Eligibility Letter. The Project or Site Eligibility Letter allows the Project to then be reviewed under a Comprehensive Permit process with the local zoning board of appeals. A review of the project design is included in this step and is required to complete the Findings before determining Site Eligibility.