A two-bedroom 2,759 sq ft triplex penthouse located in the heart of Westminster, London, has gone on sale for £3,950,000. 

The unique flat is located at Whitehall Court, a historic building dating back to the 1880s. 

Part of the grade one-listed site was used as the headquarters for MI6 until the end of the First World War. 

Over the years, Whitehall Court has been home to the likes of MI6 spymaster Sir Mansfield Cumming, the 1930s Countess of Shrewsbury and, more recently, screenwriter Brian Clemens of The Avengers. 

The flat is being sold leasehold with a 'peppercorn' ground rent and no service charge, according to Propertalis, the estate agency selling the property. 

It has panoramic views of the London skyline and looks out onto the historic House Guards Building and the River Thames. 

The penthouse flat comes equipped with three reception rooms, two bedrooms, three bathrooms, an office, a wine cellar and a large outdoor terrace. 

Internally, the property blends characterful period features with elegant modern design. A specially-designed spiral staircase even runs through the home.  

Edmond Ibrahimi, a director at Propertalis, told This is Money: 'If the walls of Whitehall Court could talk, they'd weave tales worthy of countless movie scripts.

'The London skyline stretches before you, offering an intimate connection to the city's beating heart and all its splendour; it truly feels like it's in the palm of your hand.

'Without exaggeration, it's the kind of home that would make even James Bond and Christian Grey envious.'

He added: 'This flat is destined for an old-school multi-millionaire—someone who values the unique blend of London's rich history and unparalleled elegance, nestled in the heart of English heritage and tradition.' 

Whitehall Court is, according to Propertalis, 'A residence for someone who seeks not just a property, but a masterpiece – a sanctuary where heritage and modern luxury converge seamlessly.'

Downing Street and the Cenotaph are moments away and the property benefits from easy access to Embankment and Westminster tube stations. 

As well as being right by the River Thames, the penthouse flat is a short walk from the lush grounds of St James's Park and Buckingham Palace. A slew of plush hotels and restaurants are also nearby.