What are you trying to achieve Terry ? Depends on what you want to be the main subject of your photo.To me the buildings in the distance are the main point of interest and the post office window detracts from that.Only my opinion but i would have less of the window in the photo and the main focus on the building.
We follow the lead of professional photographers of ruins here in the Southwest, and this is exactly what they do. It provides a sense that there are several buildings there, not just the one ruin, and it also provides a natural frame to your main subject. You've actually nailed it, despite your expressed uncertainty.
