Talk:Building Your Town/@comment-1851971-20120730170410

I just got the concrete wall/sniper tower upgrade & my building count was at 52... Had just reached the Port-o-Pottie after the Exit 10 Supply Run... Since I only have 42 businesses & houses, knock-down & rebuilds must count towards that total - which is good to know, since we're spending Z-bucks for that.

So yeah, I'm thinking the upgrade is based on the Port-o-Pottie location (after Exit 10) NOT your building count - as that can vary greatly depending on how many re-builds you've done.