A hedge fund boss has broken the record for the UK’s highest office rent after agreeing to pay £250 a square foot for a new London base. Ravi Mehta, the 37-year-old founder of Steadview Capital Management, signed a deal to move his company into 30 Berkeley Square in Mayfair, one of the capital's most prestigious addresses. The move will see it take up the 2,700 square feet office space in a building that is also home to the famed Phillips auction house.