A Regents Park Palace?

The Royal Al Thani family already own more of London than the Crown Estate. Now the Qatari royals are planning their own British palace in the capital as well.Plans have been submitted to convert three adjoining prime properties in London’s Regent’s Park into a single property, set to become the UK’s first £200 million home.

Sheikha Mozah bint Nasser Al Missned - one of Qatar’s former emir Sheikh Hamad bin Khalifa Al Thani's wives - bought 1, 2, and 3 Cornwall Terrace (pictured) last year and is converting the three into a palace

Sheikha Mozah bint Nasser Al Missned one of the three wives of Qatar’s former emir Sheikh Hamad bin Khalifa Al Thani, bought the homes for an estimated £120million last year.

The Arab royal, who met the Queen in 2010, has hired architects and lawyers to oversee the transformation of the properties into a single 33,000 sq ft mansion, boasting a spa, heated swimming pool, beauty salon, butler and nanny quarters, a children’s floor, games rooms, powder rooms, massage areas, two lifts and a gymnasium.

The garden sits at lower ground level, at the back of number 1 Cornwall Terrace, and is accessible by two sets of stairs. In the summer it can be dramatically lit to look like a ballroom

The Al Thani’s also own the Shard, the tallest skyscraper in Europe, Harrods and the Olympic Village.

The 13 bedroom palace will be the London home of Sheikh Hamad’s son and Qatar’s current emir Sheikh Tamim bin Hamad Al Thani, 34, who was educated at Harrow and Sandhurst.

When completed, the mansion is expected to be the most valuable residential property in London.

It is likely to be worth more than the most high profile investments of recent times in the capital – including Dudley House on Park Lane, a grade II-listed mansion which was also bought and renovated by Sheikh Hamad, 62, and is valued at £200 million.

It is expected to be worth about double the highest selling residential property in the UK – a penthouse at One Hyde Park in Knightsbridge, which sold in May this year for about £140 million.

The Qatari royal family bought the three properties – 1, 2 and 3 Cornwall Terrace – last year.

The Grade 1 listed buildings were designed and built in the 1820s by Decimus Burton, the protégé of John Nash, the architect who designed Buckingham Palace. It was named after King George IV, whose titles included the Duke of Cornwall.

The 33,000sq ft mansion will boast a spa, heated swimming pool, beauty salon, butler and nanny quarters, a children’s floor, games rooms, powder rooms, massage areas, two lifts and a gymnasium

n its current form, one Cornwall Terrace alone has seven bedrooms, 11 reception rooms, nine bathrooms, a private gym and a garage with number-plate recognition that can accommodate two limousines. The adjoining property – formed by already combining 2 and 3 Cornwall Terrace – has six bedrooms.

Its dining room, restored to its former Regency glory, seats 16.

Extensive works to be done include, structural realignment, part excavation of the lower ground floor, corridors to connect the properties and a ‘secret’ passage linking the new dining room and study.