Not clear although it's minor. The town hall was directly across the street, hence the g-men all over the place. No doubt Gram kept them well supplied with coffee and snacks.
There are remnants of the communications network still in place. A ring of fences and very small concrete block looking things for phones and who knows what. It covers a mile or two of Hudson riverfront and includes FDR and the Vanderbilt properties, both of which we regularly walk through. The Vanderbilt mansion right next door has a really cool Swiss Chalet structure that is basically the garage. Full of antique cars and sleighs that are literally sitting in the exact same spot they were when I was a kid. No longer open to the public but visible if you know where to look, and where to climb. During the war the place was host to tanks. With all sorts of dignitaries visiting there was concern of some sort of u-boat commando attack. No idea how practical that would be but U-47 did get into Scapa Flow so it probably wasn't out of the question.