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Week 8 Lecture

Course Code
John Hannigan

of 1
Harris + Ullman Multiple Nuclei Model (1945) – in contrast to concentric zone model and
sector model
1. CBD
2. Wholesale light manufacturing
3. Low class residential
4. Medium class residential
5. High class residential
6. Heavy manufacturing
7. Outlying business district
8. Residential suburb
9. Industrial suburb
- centre of growth not just one central core but multiple other nuclei spread around nuclear region
and each one has its own growth
- is very decentralized model; does not follow particular shape
- recognizes that you can have certain activities that are decentralized in city
- can have multiple points of land uses
- this is the model that city planners try to adopt because too much concentration in downtown,
so use zoning to develop model around greater Toronto where there area multiple downtowns
- so have one nucleus (e.g. Scarborough Town Centre), where there are civic and shopping centre
- condos are still constructing in that centre
- more successful model is in Mississauga near Square One (major shopping centre and
Mississauga city hall located there, also mini entertainment district and condos)
- North York is also another nucleus – North York city hall, education building, entertainment,
shopping centre
1. Certain land uses demand specialized facilities (e.g. book publishers, hotels, restaurants,
sports facilities)
2. Some land uses benefit from being close to one another (same kind of businesses clustered
around the same area – e.g. auto dealership – is advantageous because can do comparison
shopping in one location)
3. Some dissimilar land uses are separated (e.g. highly polluted area separated away from
conservation area; high class residential are separated from industrial areas)
4. Some land uses cluster where land is cheaper (determined by ability to pay – eg. low cost
subsidized housing in junction area where it had all kinds of stuff happening)