What is a great lens with Olympus for taking shots of abandoned buildings and locations? I do not own the 12-40. Recommendations?

Well, the 12-40 would be great. if you don't want to go with a zoom, then one of the great primes would work. 17, 25 would be my choices. Also the 75 would work, but the focal length takes a bit to get used to. Also, the price tag is a bit hefty compared to the other two primes, but worth it, as the IQ is absolutely stunning.

Obviously, depends on the shot, how far is the subject, can you get closer or further away? and so on.. I would choose the 7-14 F2.8 pro and the 12-40 F2.8 pro. or the cheaper zooms 9-18 and the pancake kit lens