The Record on 40B: The Effectiveness of the Massachusetts Affordable Housing Zoning Law Note: The following documents are in PDF format and require Adobe Acrobat Reader. Click the "Get Acrobat Reader" icon to download the free software. Full Report Appendix A: 40B Resources Appendix B: Subsidized Housing Developments Identified as Having Used 40B Appendix C: Performance of Individual Cities and Towns in Developing Subsidized Housing Appendix D: Regulatory Changes Made to Chapter 40B by DHCD since August 2001