Unknown building, Gas-powered MD mounted on corner
That was the "Noland" building in Atlanta. I recall seeing that siren a number of times.
Atlanta had a number of the MDs in various locations. The one atop Hurt Bldg. downtown was nicknamed "Big Myrtle." It was painted red. Back in the early 70s I took summer classes at GA State Univ; saw "Big Myrtle" as I walked from the bus stop to the school.
There was also a MD atop a building on Peachtree farther out from downtown. The Coach & 6 restaurant was located in this building.
I do recall seeing the Tbolt at Little 5 Points. There was another one farther out Roswell Rd; N of its intersection with Abernathy.
Atlanta also had Model 5s in various locations throughout the city. There were also SD-10s at fire stations on Monroe Dr.(near I-85 exit) and one at a fire station off Mt. Paran Rd.