Having decided on an urban quarter, teams should consider the building types within them that serve its patterns of use, and help to define its physical character now. They should then either show how these building types will continue to support changing patterns of use in the future, or devise new building types more suited to that role. Building types can, of course, change their function over their life: they may start as homes and mutate into offices or vice versa: they may be conceived as warehouses and become arts venues. Proposals may show how existing building types can facilitate change, or they may propose new ones.