If you have an address for Broom Hollow most of the real estate tax stuff is available online
I read this a long time ago but never made any progress on finding out who owned it at the time she lived there. “Napolitano’s ties to Alexander, Mushinski, and Kantor were forged as the four spent two of their Law School years as housemates at a 300-acre Albemarle County estate called Broom Hollow. Serendipity played a part in fostering the friendship between Napolitano and Alexander, when then U.S. Attorney General Janet Reno chose both for her advisory committee made up of 15 of the total 93 U.S. Attorneys.”
LInk here, https://www.law.virginia.edu/static/uvalawyer/html/alumni/uvalawyer/s03/napolitano.htm