that blg. in the 14th photo is the old Madison Central Office of Michigan Bell. thats where the Time Service calls were handled (back when that service still existed).
i heard a funny story about that from a friend who now works for AT&T…i guess people eventually figured out that if you called Time Service and waited for the recording to go quiet, you could talk to other parties who were also listening, and they could talk to you as well. he said “it was a great way to pick up chicks.”