I’ve been wanting to check out Buildings , a.k.a. BLDGS, for a while, so was pleased to have the chance to check them out at Haydee’s Restaurant in Mt. Pleasant — close enough to home that I could make it on a banged-up knee that has been keeping me away from shows. Plus at Haydee’s you can sit and drink mediocre margaritas. You don’t get margaritas at the Black Cat. I first heard about Buildings sometime several months ago, maybe in the spring, and when I listened to them online I was quite imp…