Aukett Europe has completed a new headquarters centre for Railtrack Midland Zone within the Mailbox development in Birmingham. The building's third floor is now home to 565 employees, all housed within a 6,000m 2openplan space. The 5.5m ceiling height allowed the architect to install a 1,800m 2mezzanine level in the space. The practice has dispensed with a suspended ceiling, opting to put the service ducts and cabling on show. Assistant director Ros Jones said: 'The Mailbox development is so unique that whilst we had a fairly blank canvas and the luxury of an unusually large amount of space to deal with, there were many different cultural, environmental and physical constraints to overcome and opportunities to be considered.'