In Los Angeles, California, there is a street called Sepulveda Blvd[1]. With extensions outside the city proper that have the same name, it once went 68.9 km end to end. Unfortunately for my hypothetical, it is not a straight line. But to me, it increases the odds that there is a street somewhere in the world's large metropolises that extends that far, and that it goes in a straight line, and you could see one end from the other, or at least the tops of buildings at either end could see each other. And then run-down is in the eye of the beholder.

[1] Part of the street was renamed. https://en.wikipedia.org/wiki/Sepulveda_Boulevard

Los Angeles is wider than that, and I'm sure you could get a high-rise to high-rise line of sight.

I would not be surprised at all if half or more of the dishes you see on commercial buildings are just vestigial, waiting for a signal that will never come again.