Qatar-backed Qatari Diar bought a former British Army site for $1.3 billion; its new 10,000-square-foot London penthouse is now listed for $64 million

• Image Credit: Qatari DiarOne of London's most exclusive new homes has arrived on the market with a price tag to match.
• The property crowns a luxury residential project developed by Qatari Diar, the real estate arm of Qatar's sovereign wealth fund, on land that once housed a historic British Army barracks.