Not sure if this is important to you, but having dealt with noisy neighbors in the past, I always ask to see how the units are actually attached to each other. I was considering SB3 and the agents were kind enough to take me out to some of the units that were being built before the dry wall went up. You can actually see how much spacing you have, as well as exactly how much overlap you will have. For plan 3, the wall that runs behind the laundry room and one of the bedrooms is the wall of the kitchen and part of the living room of a plan 1.