"Local regulations have brought multifamily development not constructed under Chapter 40B to a standstill. In the 1960s, single-family homes represented less than half of all housing permits. In the 1990s, this number shot up to 80 percent. Of the 187 sample communities analyzed in the paper, 10 prohibit multifamily development outright and nine others restrict it to occupants who are 55 years or older. Multifamily units may technically be allowed in the other 168 communities in Eastern and Central Massachusetts, yet the regulations are so restrictive that most multifamily development permitted in recent years has been through the state's contentious 40B process, which allows developers to bypass local zoning requirements if they create affordable housing."
Thanks to Hugh Pavletich