Buildings are classified into several wealth levels, zone types, and building size stages, which are affected by the region's population and the city's condition. The game simulates urban decay and gentrification with buildings deteriorating and refurbished accordingly. Buildings originally constructed for occupation by higher wealth tenants can now support lower wealth tenants in the event surrounding factors forces the current tenants to vacate the building; this allows certain buildings to remain in use despite lacking its initial occupants. Buildings and lots can be constructed on slopes.