Located just 15 minutes outside of downtown Toronto, the mansion at 26 Park Lane Circle has entertained plenty of famous figures like Richard Nixon, Margaret Thatcher, The Duke of Edinburgh and Sir Elton John. Currently owned by Lord Conrad Black (a former newspaper publisher and author), the 6.6-acre property has been in the Black family for 65 years and is estimated to be worth $21.8 million. On March 8 it will be offered for sale through Concierge Auctions, marking the first time the house has hit the real estate market.