I don't have a source on this, but it looks like Folsom Hall is the new Coaching Office/Player's Lounge area we heard being discussed as a possible addendum to the Broad a couple years back.
While it's literally on the opposite side of campus, it's not a bad move to do a big time proper renovation for offices and players to have year-round resources (locker room, weight room, and some meeting rooms will still be allocated in the Broad I'd guess). And, it makes sense with the stadium renovation moving forward now. I would love to see some of the renderings, but hopefully this is something that drops jaws when recruits walk in!