Could a new stock market shake-up property investment for good? Simon English When the International Property Stock Exchange launches in May, that might well become possible. IPSX is the brain child of David Delaney, 56, a former banker who was at Barclays for six years and Credit Suisse for 20 years as a fixed-income specialist. He plans to list individual buildings in which investors can buy shares, starting with The Mailbox in Birmingham, an office building that includes the BBC among its 46 tenants. The owners will raise £25 million from the float, valuing the building at £180 million. You have to invest at least £1000, which you can do through most recognised stockbrokers, including The Share Centre, WH Ireland and Peel Hunt.