Henderson Global Investors has extended its £560 mln (EUR 685 mln) Central London Office Fund I until December 2015. Nearly all of the fund's 84 investors voted in favour of extending the fund from 2011 in order to take advantage of the strong London office market. Clive Castle, fund manager of the Central London Office Fund I said: 'Pushing the expiry date of the fund fits in with our view of the market. We expect strong rental growth and the extension enables us to manage properties and create value.'