There’s been a bunch of cabinetmaker/woodworker/stairbuilder types on Joy Street in Somerville in the gigantic building on the left (only one way in to this street) for years. At times, I’ve heard that some of them will sublet their space to trusted people on a very limited basis. Never needed to do it, but know some folks who had a shop there for years and they always had one or two sublettors in there. Worth a try, perhaps.