Quoted from djreddog:

Our game room gets a lot of play in general, not just pinball. So the basketball game, the 2 MAME arcades, and the pool table are staying. As it stands we have maxed out the basement and that leaves us with 3 options.
1. 17 year old son may be going to college, so his room which is in the basement could become available.
2. There is one unfinished room still in the basement, approximately 20x14 that we could knock down the non-supporting wall and expand into that room. This would require adding an outdoor storage shed to store all the existing stuff in this room.