So this is what he says.
— Stefan Smith (@TheStefanSmith) September 23, 2017
Boston has been on a bender building luxury condos. This involves taking assorted lots including rental housing and razing them and building luxury condos plus 18% affordability requirement. That policy plus 14 years of wage loss for people earning less than median income, plus housing cost inflation, plus half a decade of foreclosures after the financial crisis and great recession makes Boston unaffordable for people working multiple jobs to make ends meet.
Affordable is defined in the US as 30% of median income in a neighborhood for housing cost. So a person earning $36,000 a year would have affordable housing if they paid about $1000 a month or 12,000 a year in rent.