Trip to Sear's Tower with alphabet in mind

I just got back from a trip to the Sears Tower. Btw, I still call it Sears because I believe it's the spirit of the building and I don't really care how much money you have if you want to change the name to a historic site (someone explained to me that chicagoians still call it Sears and yell in discouragement when called Willis Towers *cough wheeze*). But overall it's a pretty cool exhibit: the Skydeck Ledge. Sure there are the other exhibits – the history of the building, the founders of the site, events during the construction of the tallest building, and so forth. Overall it's a great place to blend in history and art to a specific installation, especially on one of the beloved towers in Chicago.

During my trip there and back I was busy hunting for structures that shape letters of the alphabet. I found the easy ones pretty fast – O, W, M, H, V, I, P – but the tricky ones I still need are A, R, K, D, G, Q, and Z. I think I should get a majority of them tomorrow if I don't see any today. Piece of cake? I don't think so.