Multiple Nuclei Model
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Nearly all large cities grow around many nuclei (city centers), rather than a single CBD (central business district)Harris and Ullman developed the theory in 1945 as a result of more people owning cars allowing for greater mobility and rapid growth of specialized regional centersThere are an infinite number of possible city layouts, however, they generally follow two main principles of either urbanization (change of rural to urban) or amalgamation of pre-existing settlements

In Toronto for example, nuclei such as Scarborough Town Center and Square One Mississauga are an amalgamation of pre-existing centers (into the GTA), whereas the developments of Richmond Hill and Markham have developed as a result of urbanization
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