The document summarizes the redevelopment of city centres. City centres, also called central business districts (CBDs), contain the principal commercial areas and public buildings and are the centre for business activities. CBDs can grow outwards through assimilation or retreat through discard. CBDs typically have the highest land values and contain high density developments like multi-story buildings and residences. CBDs also exhibit functional zoning where similar activities cluster together, like banks and retailers concentrating in the core.