古い建物には屋上のスペースがなかったり射界が確保できなかったりしたので、周りの建物より高い病院が高射砲陣地に選ばれたのかなと思ったり。

I wonder if the hospital was chosen as an anti-aircraft battery positions because the older buildings either lacked roof space or couldn't provide a clear field of fire, whereas the hospital was taller than the surrounding structures