Fraser Bond are the leading lettings and property management agents for The W1 London - London W1U. The W1 London is a residential development in Marylebone, London W1, which completed in 2017. The development comprises 3 penthouses, 15 apartments and 5 townhouses in the rear mews. Apartments For Sale Eighteen 2-4 bedroom apartments for sale. Townhouses For Sale Five 4-bedroom townhouses with retractable glass roofs. The entrances are on Beaumont Mews. Interiors by Darling Associates. Decorations by design studio Sophie Paterson. Prices Prices started from £4.1m in September 2017. Amenities.