Strategically located on a corner of the world-famous Harley Street, and part of the expansive Howard de Walden Estate in the Marylebone area of London, No. 65, a Grade II listed building, was originally designed by Claude Ferrier in the early 20th century. BWA has been asked by the Estate to refurbish and extend the building to create a number of refurbished flats for the rental market. After careful analysis of the original building plans and Ferrier’s other work in the area, BWA has produced a residential scheme which seamlessly knits discreet new volumes into the existing streetscape, adding to the GIA of the building with a mansard roof extension and new lift core. Incorporating thermal, acoustic and fire protection enhancements, the building will also be upgraded to use air source heat pumps for heating and cooling. Several past alterations to the building, unsympathetic to the architect’s original design intent, are to be reversed, allowing once again the original plan form to be fully expressed.