Finchatton has agreed the sale of a seven-storey house on Chester Square, SW1, for £3,700 per sq ft – the highest price achieved on the square.
The 8,200 sq ft home was sold for the £32.5m asking price to a British buyer.
The house features a 360 sq ft gym and spa, 350 sq ft cinema room, six bedrooms and staff accommodation.
The property was brought to the market in May.
Finchatton has more than £300m of development in progress, including 12 flats on Hans Place, SW1, and two properties on Mount Street, W1. Later this year it will launch The Lansbury, SW3.
Savills and Strutt & Parker acted for Finchatton.
annabel.dixon@estatesgazette.com