The 2,564-square-foot house was built in 1980 in the Lake Forest East neighborhood.
Mr. Thornburgh has been a managing director at Fiduciary Management Associates Inc., an investment management firm.
He previously was the senior portfolio manager of Scudder, Stevens & Clark Inc.
He received his bachelor's and master's degrees from Northwestern University.
According to BlockShopper.com, there have been 165 home sales in Lake Forest during the past 12 months, with a median sales price of $757,351.
Address: 264 Overlook Drive
Buyer(s): Andress H Carolyn and M 08/17/1992 Trust
Seller(s): Robert W Thornburgh and Colleen Thornburgh
Sale date: Oct. 2, 2009