I too waited until recently to build both Truce and then BG. Space is, as you say, at a premium in my City too but I doubt that will ever change. Many Players seem to overlook certain GBs without really appreciating their worth at different points in the Game. Each to their own of course as we all play a different game in one aspect or another. Levelling the "Reward" boosters is vital for efficient use of both the GBs involved and the footprint. I must admit that I hesitated to site BG but it is most pleasing to see the multiplier in action.