Near where I live in Cambridge, MA a four story apartment building was recently built/assembled over a weekend. They moved in modular components that were built

Near where I live in Cambridge, MA a four story apartment building was recently built/assembled over a weekend. They moved in modular components that were built in a factory in Maine. I think it was done on the weekend because they could briefly shut down the street (Mass. Ave.) to truck in the pieces. The interiors took longer, and are probably customized for the buyers, but the structure itself appeared in a couple days.