Fraser Bond are the leading lettings and property management agents for 33 Cavendish Square - London W1G. 33 Cavendish Square is an office building on Cavendish Square in Marylebone, London W1. The building is overlooking the communal gardens of Cavendish Square. Architect: TP Bennett & Son. 2018 October - Services office provider Landmark trebles its size in the building. 2017 - Klarna UK Limited takes 6,600 sq ft at 33 Cavendish Square.