They also shot a scene for Spiderman there as well. The part when Harry goes to his father to tell him that he was hurt because of Peter and Mary Jane being in love with each other. It's also when Norman's green goblin sickness was getting worse and Harry heard the cackling echoing through the hall. Another thing I remembered was, Sam raimi said that their production designer suggested for them not to shoot there, because he learned that Tim Burton had shot a couple of scenes for Batman there. So they shot it in a different section of the mansion so that it wouldn't look the same as it was in Batman.
They also shot a scene for Spiderman there as well. The part when Harry goes to his father to tell him that he was hurt because of Peter and Mary Jane being in love with each other. It's also when Norman's green goblin sickness was getting worse and Harry heard the cackling echoing through the hall. Another thing I remembered was, Sam raimi said that their production designer suggested for them not to shoot there, because he learned that Tim Burton had shot a couple of scenes for Batman there. So they shot it in a different section of the mansion so that it wouldn't look the same as it was in Batman.
Did you see the first set photo for flash? It’s Wayne Manor from 1989
It would be funny if there's a secret room for the batcave
So they used the rooms from this mansion, to the knebworth mansion in batman 89.