Distinct, which operates three pubs in London - the Prince Albert in Camden, The Adam & Eve in Mill Hill and The Three Compasses in Hornsey - plans to make a 'substantial investment' to turn the 15th Century property, the former farmhouse home of Oliver Cromwell's secretary John Thurloe, into a boutique hotel with gastropub.
Leakey told BigHospitality the acquisition was too good an opportunity to miss.
"We have been based in London where real estate is scarce - it took us 18 months to find our last site - so we were looking outside the capital and this came up," he said. "It was just a natural progression for the company to move into the hotel sector too."
The hotel, formerly part of the Clarion Collection, will continue to trade over the festive season with refurbishment work expected to start early next year.
Leakey said all 76 bedrooms would be refurbished with the hotel's ballroom and meeting rooms to be reconfigured to create a new food and beverage space.
"It's a beautiful building and we'll make sure it is sympathetically restored to create a unique hotel," he said.