Property buyers may expect to have to pay through the nose for a terraced house in Westminster, but even here, few would expect to shell out �100million to get their hands on the deeds.

That is the asking price of One Cornwall Terrace in Regent’s Park, making it the most expensive terraced property in the world.

The Grade I listed, 21,500sq ft mansion is on the market with estate agent Savills.

Overlooking Regent’s Park’s Outer Circle, the luxury property has 11 reception rooms, seven bedrooms and nine bathrooms.

It also boasts a leisure complex complete with gymnasium and swimming pool, along with a sunken, landscaped 40m garden.

Despite its marble-lined walls the 19th century property has been thoroughly modernised, with beauty treatment areas and a catering kitchen added to the property.

Described by Savills as one of the most important properties in London, the mansion was originally designed by renowned architect Decimus Burton and built in 1823.

Despite the lofty price tag, which will see the buyer asked to cough up �7million in stamp duty alone, the eventual buyer will pay only �1,369 per year in Council Tax, the top band for any property.