was it in Harvard Square? There's an EA one, supported by an Aug 2022 grant from Open Phil. FTX Future Fund, before its collapse, offered a surprising number of grants for co-working spaces

Centre for Effective Altruism — Harvard Square Coworking Space - Open Philanthropy

Open Philanthropy recommended a grant of $8,875,000 over five years to the Centre for Effective Altruism (CEA) to support a five-year lease and refurbishment for an office located in Harvard Square. T...

yes, but it's actually not that one. It's the student AI safety club: https://haist.ai/ same building as a few local startups I think