Surviving commercial buildings from early Ottawa can be seen in some parts of downtown, most notably the heritage area along Sussex Drive and the Sparks Street pedestrian mall. These tend to be low stone structures densely clustered together. The vast majority of Ottawa's commercial buildings are similar to those that would be found anywhere in North America. Downtown Ottawa has several commercial streets, the most important being Bank Street the lower levels of many office towers also contain shopping areas. One distinctive area is the Byward Market, home to dozens of small shops and restaurants. The city has several shopping centres, the most central and prominent being the Rideau Centre. The older suburbs each have central shopping malls, such as Billings Bridge Plaza, Bayshore Shopping Centre, Carlingwood Mall. In recent years the newest suburbs have been home to large collections of big-box stores rather than traditional malls, with sprawling such complexes in Kanata, Barrhaven, and South Keys.