The commercial centre of Uppsala is quite compact. The city has a distinct town and gown divide with clergy, royalty, and academia historically residing in the Fjärdingen neighbourhood on the river's western shore, somewhat separated from the rest of the city, and the ensemble of cathedral, castle and university buildings has remained mostly undisturbed until today. While some historic buildings remain on the periphery of the central core, retail commercial activity is geographically focused on a small number of blocks around the pedestrianized streets and main square on the eastern side of the river, an area that was subject to a large-scale metamorphosis during the economically booming years in the 1960s in particular. During recent decades, a significant part of retail commercial activity has shifted to shopping malls and stores situated in the outskirts of the city. Meanwhile, the built-up areas have expanded greatly, and some suburbanization has taken place.