By Meg Muckenhoupt With 12 townhouses proposed for a half-acre site at 91 Beatrice Circle, Belmont is buzzing with questions about how a developer can suggest such a dense development. The answers—because this question does not have a single, simple answer—have to do with a law known as Chapter 40B, aka the “Massachusetts Comprehensive Permit Law,” the legal definition of “affordable housing,” and how Belmont has developed up to now. What is Chapter 40B? Chapter 40B is a state law that was passed in 1969 to increase the supply of affordable housing in Massachusetts. As the Department of Housing and [READ MORE]