The Burgess Model: Also known as the Concentric zone model, was a Model that was created in 1925 by Ernest Burgess. It was based on Chicago & was based on the idea that land values are at their highest in the centre of a town or city.
CBD: Also known as the central business district, it is the center of the city.
The CBD is the oldest area of a city - but has many new buildings as due to areas being redeveloped. e.g the Bull-Ring shopping centre in Birmingham.
The buildings found in the CBD include: Department stores, offices, theatres and hotels.
The function of the CBD is to be the centre of Government and commercial activity in the city.
The land in the CBD is often too expensive to expand outwards, so many building are built upwards to maximise use of the amount of space available.