@OP The RS II owner's manual suggests a starting point of two to three feet from the front wall for the speakers. There's no reason that the speakers can't work in a room the size of your office. It's not a small room by international standards. The later II B came with an equaliser so you could always use something like a Schiit to shelve down the bass if necessary. As has been said by a few posters, correct room treatment is the key to getting big speakers to work in, shall I say, less big rooms.
Speakers "Too Big" for room
I have an office with KEF LS50 speakers. I’m gonna try to move in some large Infinity full-range speakers. Typically, conventional wisdom would say that these speakers are too big for the room. I’ll know for sure how they will sound but, why would anyone say that. Why can’t you put large speakers in a small room???