Van Horne's Mansion
From what I read, the fictional Lenox mansion in Eastwick, Rhode Island was "portrayed" by three different buildings.
Castle Hill in Ipswich, Massachusetts, was used for the exterior of the Lenox Mansion, while the lobby of the Wang Theatre in Boston stood in for the main hall. Other interiors were filmed at the Greystone Mansion in Beverly Hills, though the swimming pool and Daryl's library were sets built on the Warner Bros. backlot.[14]
https://en.wikipedia.org/wiki/Castle_Hill_(Ipswich,_Massachusetts)
Wang Theater lobby:
https://en.wikipedia.org/wiki/Wang_Theatre#/media/File:Wang_Theater.jpg
Greystone Mansion:
https://en.wikipedia.org/wiki/Greystone_Mansion
https://www.google.com/maps/place/905+Loma+Vista+Dr,+Beverly+Hills,+CA+90210/@34.0897001,-118.4020792,301a,35y,39.37t/data=!3m1!1e3!4m6!3m5!1s0x80c2bc22570f6e51:0xf8a10376b6b1d583!8m2!3d34.0919167!4d-118.4014301!16s%2Fg%2F11b8z029wq?entry=ttu
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