Blackstone takes £80m risk on London park West London has seen an awful lot of demand even though the market has been tough further out. Oil and gas [companies] have been a strong driver of demand. The other area is TMT [technology, media and telecoms]. We very much see those areas as continuing to be a driver of demand in the west London market. Mr Madden said that the west London market has been favoured by companies that particularly want to attract young workers. Amazon is one potential target for the latest phase of the scheme, although the online retailer is thought to be seeking up to 400,000 sq ft of office space and currently favouring the Paddington and Holborn areas of the city. When completed, Building 7 at Chiswick Park will be a 12-storey, 334,000 sq ft building and is expected to be home to more than 3,000 office workers. It will bring the total amount of commercial office at the park to 1.8m sq ft. Chiswick Park borders the west London suburbs of Chiswick and Acton, and was bought by Blackstone in 2011 for £480m from a fund managed by Schroders and Aberdeen Property Investors. Since then it has let a total of almost 400,000sq ft of space to tenants including Absolut Spirits, Pepsi, Swarovski, Aker Solutions, International Game Technology, Otis Lifts and International SOS. Vacancy at the Park is less than 1pc. Chiswick Park is believed to be valued at around £800m now, and while Blackstone was understood to be considering a sale, a refinancing is now thought more likely. Stanhope will be development manager and Lend Lease contractor on Building 7. Property agent Jones Lang LaSalle has predicted that demand for regional office space in the UK will grow from 2014 onwards as household incomes improve and regional employment picks up.