A famous mansion.
Here is a link to a thread about a mansion seen in a scene from an episode of FBI: Most wanted.
And today, January 17, 2023 I watched a rerun of the FBI episode Hero's Journey" (20 September 2022). And it had much more scenes set at that mansion, which is the largest mansion in the New York City area.
It is Oheka, on Long Island, the second largest mansion in the USA.
https://en.wikipedia.org/wiki/Oheka_Castle
https://www.oheka.com/