The former prime minister, Margaret Thatcher, lived at the white stucco-fronted house from 1991 until her death of a stroke aged 87 in 2013. The original part of the house was built between 1820 and 1840 and is on sale through luxury estate agent, Savills.
"Such an eminent and rare property, in terms of location, renovation and history, no. 73 will have a truly widespread appeal to any buyer at this level of the market looking for an exceptional London home. If only the walls could talk, one could almost imagine Ronald Reagan and other heads of state sitting with Baroness Thatcher in her dining room," Richard Gutteridge, head of Savills Sloane Street office, said in a news release.
Thatcher was the first woman to lead a major western democracy and remains the only British female prime minister. She won three successive national elections and led the country for more than 11 years from 1979 to 1990, a record unmatched in the 20th century.
Several features installed by Thatcher remain, including a steel-lined, bombproof front door and original security glass in all the windows facing the main square.
Leconfield, a Belgravia construction company, purchased the property in 2013. It spent 18 months refurbishing the house, which now boasts a lift, a newly constructed mews house and a garage.
"We have strived to achieve the perfect balance between traditional and contemporary living by respecting the house's history and restoring many of the original features, while tastefully incorporating the latest in modern technology," George Brooksbank, managing director of Leconfield, said in the news release.