Accessible to what? The alleys they used to sleep in before they got housed? So long as anybody can afford the T - which is easier to get than not once you're housed, given that subsidized housing takes a percentage of your income instead of as much as they can get at market rate - then it doesn't matter where they are inside the Greater Boston Area.

For what it's worth, we're already at where you are suggesting. They already build public housing out in Dorchester, a hugely disproportionate amount. That's where the least resistance is, because nobody out there has the money to fight it. Boston's solution to homelessness and addiction is to put all of them in one place, away from all the tourists who take photos, and that's how and why we end up with situations like Mass & Cass.

If we're gonna talk about why the housing crisis is so fucking terrible here, it's because the most politically expedient solution has always been "Well we'll put another bandaid in Dorchester and that'll keep my poll numbers up". It's been that way for longer than I've been alive and it'll be that way until we're both dead unless something changes. We gotta build everywhere else and it can't just be yet more lab space.