The Company is based in London and the great majority of its assets are in London. It mainly owns office buildings, with a smaller amount of retail property. The largest group of properties is in the Marylebone district of central London just to the north of Oxford Street, in and around Great Portland Street. The Company also owns properties in the West End and in the City of London. At 31 March 2014 Great Portland Estate's property portfolio was valued at circa £2.0 billion.