This rare and remarkable duplex penthouse was designed by the architect Piers Gough of CZWG and is set over two expansive levels overlooking the wonderful green of Charterhouse Square in Clerkenwell. It extends to approximately 3,700 sq ft and has been home and studio to an artist and an art director for several decades, with a dramatic upper level bathed in light from a glazed cathedral ceiling. The square is highly coveted, brilliantly positioned as it is by Smithfield Market, between Farringdon and Barbican.