PLAN 100: Cities in Transition

Sources and References

Primary textbook — Markus Moos, Tara Vinodrai, Ryan Walker (eds.), Canadian Cities in Transition: Understanding Contemporary Urbanism, 6th ed. (Oxford University Press, 2020). Supplementary texts — Peter Hall Cities of Tomorrow; Jane Jacobs The Death and Life of Great American Cities; Ebenezer Howard Garden Cities of To-morrow; Mike Davis Planet of Slums; Edward Glaeser Triumph of the City; J. David Hulchanski The Three Cities Within Toronto; Julian Agyeman Introducing Just Sustainabilities. Online resources — MIT OpenCourseWare 11.001J “Introduction to Urban Design and Development”; Harvard Graduate School of Design open course materials.

Chapter 1 — What Are Cities? Why Plan Them?

A city is more than a dense pile of buildings; it is a durable institution that concentrates people, capital, information, and power in space. Louis Wirth’s classic formulation defined the urban by size, density, and social heterogeneity, and these three features still capture why cities behave differently from hinterlands. When strangers live close together, specialization in labour becomes possible, markets thicken, and cultural innovation accelerates. Edward Glaeser calls the resulting feedback loop the “triumph of the city”: proximity lowers the cost of learning, and learning is the raw material of the modern economy.

But proximity produces costs as well as gains. Congestion, disease, pollution, fire, noise, conflict between incompatible land uses, and the unequal distribution of amenities and hazards all follow from crowding. Planning emerged as a public response to these externalities, an attempt to coordinate the private decisions of thousands of actors so that the collective outcome is livable. Canadian geographers Pierre Filion and colleagues describe the city as a socio-technical system with three intertwined layers: a built environment that changes slowly, a set of institutions and regulations that changes at middle speed, and flows of people, goods, and capital that change quickly.

Planning works on all three layers at once. Zoning bylaws govern how parcels can be used; capital budgets decide where pipes, roads, and transit lines go; official plans set long-range visions; and development approvals mediate between landowners and the public interest. Because land is fixed, durable, and politically contested, these decisions outlive the governments that make them. The critical lens of the course also insists that planning is never neutral. Who is at the table, whose knowledge counts as expertise, and whose neighbourhoods get designated as “blighted” or “up-and-coming” are all questions of power. Understanding cities in transition means watching how these layers, and these power relations, shift over time.

Chapter 2 — The Evolution of Cities from Antiquity to Industrialization

The earliest cities appeared in Mesopotamia, the Indus Valley, the Nile, and later in Mesoamerica and China, wherever agricultural surpluses and record-keeping could support non-farming populations. These settlements combined a ceremonial core (temple, palace, granary) with a ring of artisans and traders, and their walls marked a sharp boundary between the urban and the rural. Classical Greek and Roman cities added civic infrastructure: the agora, the forum, aqueducts, paved streets, and public baths. Roman engineers in particular developed the gridded castrum plan, exported across the empire and still visible under the street patterns of London, Paris, and Cologne.

Medieval European cities grew more organically on top of or beside these Roman bones. Narrow lanes followed property lines rather than surveyors’ lines, a cathedral and a market square anchored the centre, and a guild-regulated economy filled the interstitial blocks. Islamic cities of the same period, studied by historians such as Janet Abu-Lughod, developed distinctive courtyard housing and covered bazaars adapted to hot-dry climates. In Asia, imperial capitals like Chang’an and Beijing were laid out according to cosmological principles with axial symmetry and walled wards.

Renaissance humanists reintroduced the idea that a city could be deliberately composed. Alberti, Palladio, and the treatise writers imagined ideal cities as geometric diagrams of reason and virtue, and Baroque rulers applied those ideas in fragments: the grand avenue, the radial plaza, the fortified star-shape. Colonial powers carried European urban templates to the Americas. Spanish Laws of the Indies prescribed grid towns around a central plaza; French and British colonial cities in North America followed similar rationalist layouts. The pre-industrial city, whatever its cultural origin, was generally walkable, mixed-use, and limited in size by the speed of a pedestrian or a cart. That constraint was about to break.

Chapter 3 — The Industrial City and the Birth of Planning

The steam engine, the factory, and the railway tore the older city apart. Between roughly 1800 and 1900, Manchester, Glasgow, Birmingham, and Chicago multiplied their populations many times over as rural migrants and overseas immigrants poured in to work in mills, mines, and packing houses. Friedrich Engels’s reporting on Manchester and Charles Booth’s poverty maps of London documented the result: dense tenements with no sanitation, air thick with coal smoke, cholera and tuberculosis outbreaks, and life expectancies in working-class districts scarcely above thirty. In Canadian cities like Montreal and Toronto, Herbert Ames’s The City Below the Hill (1897) described comparable conditions.

Peter Hall, in Cities of Tomorrow, argues that modern planning was born as a horrified reaction to this “city of dreadful night.” Public health reformers pushed for building codes, setback rules, minimum window sizes, and sewers. The British Public Health Act of 1848 and later housing reform acts gave municipalities legal tools to intervene in private property for the sake of collective welfare. Frederick Law Olmsted, designer of New York’s Central Park and Montreal’s Mount Royal, argued that parks were the “lungs of the city,” essential respite from industrial grime.

By the late nineteenth century, the City Beautiful movement, inspired by the 1893 World’s Columbian Exposition in Chicago, proposed that grand Beaux-Arts civic ensembles could morally uplift citizens and project civic pride. Canadian examples include Ottawa’s parliamentary precinct and Edmonton’s legislative grounds. City Beautiful produced monuments but left slums largely untouched, and critics soon demanded something more systemic. Out of that demand came the three utopian visions that would dominate twentieth-century planning: Haussmann’s surgical boulevards, Howard’s garden cities, and Le Corbusier’s radiant towers. Each took a different theory of what the industrial city had done wrong, and each left deep marks on the cities we inhabit today.

Chapter 4 — Haussmann, Howard, and Le Corbusier

Between 1853 and 1870, Baron Georges-Eugène Haussmann, under Napoleon III, cut wide straight boulevards through the dense fabric of medieval Paris. Officially the project improved circulation, sanitation, and military control; practically it also created enormous real-estate value along the new frontages and displaced tens of thousands of poor residents. Haussmannization became shorthand for authoritarian, demolition-led modernization, and its echoes run through later urban renewal programs everywhere from Robert Moses’s New York to Montreal’s Dozois Plan.

Ebenezer Howard offered a gentler answer. Garden Cities of To-morrow (1898, revised 1902) proposed self-contained satellite towns of about 32,000 people, ringed by permanent agricultural greenbelts and connected to a central city by rail. Each garden city would combine the economic opportunity of the town with the fresh air and community of the country, and land would be owned in common so that rising values returned to the public. Letchworth (1903) and Welwyn (1920) were built as prototypes. Howard’s “three magnets” diagram remains one of planning’s most reproduced images, and his influence shaped British New Towns after 1945 and the suburban designs of Radburn, New Jersey, and Don Mills, Ontario.

Le Corbusier, the Swiss-French architect, rejected both the historic city and the garden-city compromise. In The Athens Charter (1933, published 1943) and earlier manifestos, he argued that modern life required the functional separation of dwelling, work, recreation, and circulation, and that these functions should be housed in widely spaced high-rise slabs set in parkland. His Ville Radieuse imagined demolishing much of central Paris to replace it with sixty-storey cruciform towers. Almost no city was rebuilt literally on Corbusian lines, but the aesthetic and ideology filtered into post-war public housing, expressway construction, and high-modernist capitals like Brasília and Chandigarh. By the 1960s this package was ripe for critique, and the critique came from a journalist in Greenwich Village.

Chapter 5 — Jane Jacobs and the Critique of Modernist Planning

Jane Jacobs’s The Death and Life of Great American Cities (1961) is often cited as the hinge on which twentieth-century planning turned. Writing from her West Village stoop, Jacobs attacked the reigning orthodoxies of urban renewal, tower-in-the-park housing, and highway-based city rebuilding. What made her critique durable was that it was not merely aesthetic. She proposed an empirical theory of how cities generate safety, economic vitality, and civic life.

Her four “generators of diversity” were short blocks, a mix of primary uses, buildings of varied ages and rents, and a sufficient concentration of people. Short blocks multiply corner opportunities and pedestrian choices; mixed uses bring different people to the sidewalk at different times of day; varied buildings let low-margin new businesses coexist with established ones; and density supplies the customers and eyes needed to make the first three matter. The resulting “sidewalk ballet” — her most quoted phrase — describes the informal surveillance and acquaintance that keep lively streets self-policing.

Jacobs also popularized the idea that planners should look at cities as “problems of organized complexity,” borrowing from Warren Weaver. Top-down master plans based on statistical averages would always misread the fine-grained interdependencies that real neighbourhoods depend on. Her successful campaign against Robert Moses’s Lower Manhattan Expressway, and her later fights against the Spadina Expressway after she moved to Toronto in 1968, were practical extensions of this argument.

Jacobs’s ideas have been criticized in turn. Her model assumed a kind of white middle-class authenticity, said little about race or regional economies, and has been enlisted by gentrifiers as much as by anti-displacement organizers. But the core instinct — that cities are emergent systems, that street-level experience is legitimate knowledge, and that residents deserve voice in decisions about their neighbourhoods — is now baked into mainstream Canadian planning practice. Every Ontario municipal official plan that talks about “complete streets” or “eyes on the street” is quoting her, whether or not it knows it.

Chapter 6 — New Urbanism and Contemporary Planning Movements

By the late 1980s a group of architects and planners including Andrés Duany, Elizabeth Plater-Zyberk, and Peter Calthorpe codified Jacobs-inspired principles into a movement called New Urbanism. The 1996 Charter of the New Urbanism called for walkable neighbourhoods, mixed use, human-scale architecture, a connected street grid, public transit, and a clear edge between town and countryside. Seaside, Florida, Kentlands, Maryland, and Cornell in Markham, Ontario are flagship built examples.

New Urbanism has been both influential and controversial. Supporters argue that it offers a template for retrofitting sprawl into something denser, greener, and more sociable, and that form-based codes (which regulate building shape rather than narrow land uses) give planners sharper tools than conventional Euclidean zoning. Critics counter that many New Urbanist projects are aesthetic suburbs for the wealthy, that they romanticize small-town America, and that their price points contradict their stated social goals.

Several related movements share much of the vocabulary. Smart Growth, championed in Maryland and later across North America, bundles compact development, transit investment, and farmland protection. Transit-Oriented Development (TOD) concentrates higher densities and mixed uses within walking distance of rapid transit stations; the Toronto “Places to Grow” plan and Vancouver’s SkyTrain corridors are Canadian examples. The Tactical Urbanism movement emphasizes cheap, quick, reversible experiments — pop-up parklets, painted bike lanes, pedestrian plazas — as a way to test ideas before committing capital. Underlying all of these is a pragmatic post-Jacobs consensus that dense, walkable, mixed neighbourhoods generally outperform their auto-dependent counterparts on sustainability, health, and fiscal metrics. Contemporary debates focus less on whether this is true and more on how to deliver it without producing displacement.

Chapter 7 — Eras of Canadian Urbanization

Canada’s urban history can be sliced into four rough eras, each shaped by a different economic engine and political settlement. The mercantile era (roughly 1600–1850) produced a network of small port and staple-trade towns — Quebec, Halifax, Montreal, York — tied to European and American markets by rivers and sea lanes. Built form was compact, low-rise, and pedestrian. Railway-era industrialization (1850–1945) then concentrated population and capital in a handful of regional centres, especially Montreal and Toronto, and produced the downtown business districts, streetcar suburbs, and working-class districts that still shape these cities.

The Fordist era after 1945 is the one that looks most familiar today. Mass production, stable union wages, cheap oil, federal mortgage insurance through CMHC, and a booming birth rate combined to fuel a suburban expansion unlike anything before. Don Mills (1953), designed by Macklin Hancock for E.P. Taylor, was the prototype: curvilinear streets, single-family homes, a shopping plaza at the centre, and strict separation of uses. The same decades saw massive investment in expressways, the dismantling of streetcar networks in most Canadian cities (Toronto being the partial exception), and the construction of public-housing towers, shopping malls, and industrial parks at the urban edge. This was planning at its most confident and most Corbusian.

The post-industrial or post-Fordist era, from about 1975 to the present, has been messier. Manufacturing employment collapsed or moved overseas, leaving rust-belt landscapes in places like Hamilton and Windsor. Service, finance, technology, and cultural industries grew in their place, concentrating highly paid knowledge workers in reviving downtowns while pushing lower-paid service workers to aging inner suburbs. Immigration became the main driver of metropolitan population growth, shifting from European to South Asian, East Asian, Caribbean, and African source regions. Housing costs soared in Vancouver, Toronto, and increasingly in Montreal, Ottawa, Halifax, and Victoria. Climate policy, reconciliation with Indigenous peoples, and digital infrastructure now sit alongside growth management as front-line planning issues.

Chapter 8 — The Inner City and the Suburbs

For most of the twentieth century, North American planners told a simple story: wealthy people live in the suburbs, poor people live downtown, and the job of renewal is to rescue the centre. That story no longer fits the Canadian metropolis. Gentrification, the process by which middle- and upper-income households move into and transform working-class urban neighbourhoods, has reshaped inner Toronto, inner Vancouver, the Plateau in Montreal, and comparable districts across the country. Neil Smith described gentrification as a “rent gap” phenomenon, in which disinvestment depresses land values until the potential return on reinvestment becomes irresistible; Ruth Glass, who coined the term in 1964, emphasized the cultural signals of the process.

Meanwhile the suburbs have diversified beyond recognition. What Roger Keil and colleagues call the “in-between city” — older, automobile-oriented inner suburbs like Scarborough, Surrey, and Laval — is now home to the majority of Canada’s recent immigrants and a growing share of its low-income households. Postwar apartment towers that were once middle-class housing have become de facto affordable housing for new Canadians, often in neighbourhoods poorly served by transit and short on public amenities. Pierre Filion’s work on suburban “constellations” stresses that contemporary suburbs are not uniform but layered: pre-war streetcar suburbs, postwar single-family tracts, high-rise nodes, big-box corridors, and exurban estates all coexist within a single region.

J. David Hulchanski’s influential 2010 report The Three Cities Within Toronto mapped these shifts starkly. Between 1970 and 2005, neighbourhoods closer to rapid transit and the central core became measurably richer, a ring of middle-income neighbourhoods shrank, and a growing outer ring became poorer. The resulting spatial pattern looks less like the classic concentric-ring Chicago-school model and more like an inverted doughnut of concentrated wealth surrounded by concentrated disadvantage. The policy implication is that inner-city revitalization programs and suburban poverty strategies cannot be designed in isolation.

Chapter 9 — Indigenous Cities and Decolonizing Planning

Canadian cities sit on Indigenous lands that were inhabited, governed, and planned long before European contact. Winnipeg, Saskatoon, Regina, Edmonton, Calgary, and Thunder Bay all have Indigenous populations well above the national average, and the majority of Indigenous people in Canada today live in urban areas. Yet planning curricula and municipal plans have historically treated Indigenous presence as if it were rural, temporary, or invisible. Ryan Walker, David Natcher, Evelyn Peters, and collaborators in the Moos, Vinodrai, and Walker textbook argue that this erasure is itself a planning choice, and that rethinking it is central to any decolonizing practice.

Decolonizing planning is not a single method. It draws on treaty relationships and nation-to-nation protocols, on urban reserves like Muskeg Lake Cree Nation’s land in Saskatoon, on Indigenous-led housing providers and friendship centres, and on creative co-management arrangements in parks, waterfronts, and watersheds. Nicholas Blomley’s Unsettling the City analyzes how property law itself, with its assumptions about exclusive ownership and survey boundaries, encodes colonial categories and forecloses other ways of relating to land. Listening to Indigenous legal orders and land-use practices means taking seriously that “land” is not only real estate.

Concrete steps in contemporary Canadian practice include requiring Indigenous consultation in official plans, embedding Indigenous place names and signage, incorporating Indigenous design principles in public spaces and buildings (the Canadian Museum for Human Rights, the Indigenous Health Centre at University of Toronto), and funding Indigenous-led housing strategies. The Truth and Reconciliation Commission’s Calls to Action and the United Nations Declaration on the Rights of Indigenous Peoples now frame these conversations legally and morally. Decolonization is a long project rather than a check-box, and it asks Canadian planners to sit with the discomfort that their profession has, in many cases, been an instrument of dispossession.

Chapter 10 — Urban Inequality: Space, Class, Race, Gender

Cities distribute opportunity through geography. Where you live shapes the schools your children attend, the jobs you can reach in a reasonable commute, the air you breathe, the grocery stores you walk to, and the likelihood that you will encounter police in either friendly or hostile ways. Urban land economics explains part of this pattern. Land prices reflect accessibility, amenity, and expected future returns, and households sort themselves across the resulting surface according to what they can pay. William Alonso’s bid-rent model from the 1960s remains a useful first cut, even though real cities are vastly more complicated.

But price is never the whole story. Historical redlining in the United States and more subtle Canadian practices — restrictive covenants in early-twentieth-century Toronto and Vancouver, exclusionary zoning that outlaws apartments in wealthy neighbourhoods, discriminatory policing of public space — have channeled racialized and low-income communities into specific districts and kept them there. Scholars of intersectionality following Kimberlé Crenshaw insist that race, class, gender, disability, and sexuality interact rather than add up, producing lived experiences of the city that no single category captures.

Feminist urbanism, from Dolores Hayden and Leslie Kern, asks whose daily routines the city is built around. The classic “journey-to-work” commute, modelled on a male breadwinner, poorly fits the chained trips (daycare, grocery, school, part-time job, elderly parent) that women disproportionately make. Safe public transit at night, stroller-friendly sidewalks, and shaded playgrounds are not peripheral concerns; they are core infrastructure questions. Queer geographies similarly remind us that “public space” has never been equally public, and that even tolerant cities can quietly regulate who is allowed to linger where. Planning as a field has begun, unevenly, to integrate these perspectives into equity frameworks and inclusive-design guidelines, but the distance between rhetoric and budgeted action remains large.

Chapter 11 — Housing: Home, Commodity, and Crisis

Housing sits at the intersection of everything the course touches: economy, demography, inequality, climate, and the built environment. It is also a genuine puzzle, because a house is simultaneously a dwelling, a financial asset, a tax base, an insurance instrument, a community anchor, and for many households the single largest item they will ever buy. These roles are not always compatible, and the tension between housing-as-home and housing-as-asset is the central faultline of current Canadian urban policy.

After 1945, the federal government through CMHC underwrote a massive expansion of owner-occupied suburban housing, primarily through mortgage insurance and subdivision approvals. Public housing was built in smaller quantities, often as high-rise towers, and was gradually downloaded to provinces and municipalities during the 1980s and 1990s. Social housing construction slowed to a trickle just as incomes at the bottom of the distribution were stagnating, producing the long affordability squeeze Canada is now in. The 2017 National Housing Strategy reopened federal investment but at levels far below what analysts like Steve Pomeroy argue is necessary.

Meanwhile, the commodification of housing accelerated. Global capital, low interest rates (until 2022), tax preferences for owner-occupied and investor properties, platform rentals like Airbnb, and the financialization of purpose-built rental stock by real-estate investment trusts have all pushed prices up faster than local incomes. Vancouver and Toronto now rank among the world’s least affordable major cities on price-to-income ratios. The human rights framework, articulated by the UN Special Rapporteur Leilani Farha and echoed in Canada’s 2019 legislation, insists that adequate housing is a fundamental right rather than a market outcome to be optimized. Translating that principle into tools — inclusionary zoning, non-market housing providers, rent regulation, vacancy taxes, community land trusts, co-operatives — is the practical work of contemporary housing planning.

Chapter 12 — Transportation and Automobility

Transportation and land use are two sides of the same coin. A city built for cars, with wide arterials, drive-through commerce, and scattered single-use pods, produces more driving, which produces more demand for road capacity, which produces more sprawl. A city built for walking, cycling, and transit produces the opposite feedback loop. Planners call this the “land use — transportation connection,” and it is one of the most empirically robust findings in the field.

The Fordist Canadian city was overwhelmingly built for the first loop. Expressways cut through established neighbourhoods (the Gardiner in Toronto, Ville-Marie in Montreal, the cancelled Spadina), parking minimums forced every new building to subsidize driving, and streetcar networks in most cities were ripped out between the 1940s and 1960s. The result was “automobility” in the sense John Urry described: a hybrid socio-technical system that shapes not just trips but bodies, schedules, land markets, identities, and climate emissions.

Beginning in the 1970s, a counter-movement pushed for integrated transit and land-use planning. Vancouver’s choice not to build freeways into downtown, Toronto’s preservation of its streetcar network, Calgary’s C-Train, and Montreal’s Métro all anchored more transit-oriented regions than their peers. Contemporary best practice, codified in documents like Ontario’s Growth Plan and Metro Vancouver’s Regional Growth Strategy, concentrates new development near rapid transit, protects farmland at the edge, and invests in active transportation. Complete-streets policies allocate road space among pedestrians, cyclists, transit, and cars rather than defaulting to cars. Electric vehicles will decarbonize the fleet but will not, by themselves, solve congestion, inactivity, road deaths, or the spatial inefficiency of single-occupant trips. The transport challenge is not only technological but political: reallocating street space and rewriting zoning is always a fight.

Chapter 13 — Public Space, Density, and Urban Life

Public space is where strangers meet. Parks, sidewalks, plazas, libraries, transit stations, beaches, markets, and community centres are the stages on which urban citizenship is rehearsed, and their design shapes who feels welcome, who is excluded, and how civic life gets practiced. William H. Whyte’s 1970s Street Life Project used time-lapse film to show that the most successful New York plazas had movable seating, sun, food, water, and a direct relationship to the sidewalk, while poorly performing plazas had windswept paving and no-nothing benches. Jan Gehl in Copenhagen extended this empirical approach into a method for measuring and improving “life between buildings.”

Density amplifies public space. When more people share a neighbourhood, parks get more use, main streets support more shops, transit runs more often, and chance encounters multiply. But density without good design produces the opposite: crowded corridors, shaded canyons, no-go zones. Ken Greenberg’s Walking Home argues that successful density depends on the quality of its ground floors, its streets, its transitions, and its public realm. The goal is not high-rise for its own sake but legible, walkable, three-dimensional neighbourhoods.

Canadian cities have had mixed success. Vancouver’s “Vancouverism,” with slim residential towers on retail podiums and a generous seawall, is internationally admired; Toronto’s downtown condo boom has produced density without always producing quality public realm. Privatization of nominally public space — privately owned public spaces, or POPS, in towers and malls — raises concerns about who controls behaviour on what looks like a sidewalk. Public space is also contested: skateboarders, unhoused residents, protesters, buskers, and children all have legitimate claims, and a democratic planning practice works hard to accommodate rather than criminalize that plurality. The question of who the public in “public space” actually includes returns us, once again, to the equity themes of earlier chapters.

Chapter 14 — Climate Change and the Urban Future

Cities are simultaneously the main source of greenhouse-gas emissions and the main site of climate vulnerability. Buildings, transportation, and industry in urban regions account for roughly three-quarters of global emissions, while coastal cities, riverside cities, and cities in already-hot climates face the sharpest physical risks: sea-level rise, storm surges, urban heat islands, flash floods, wildfires, and supply-chain disruptions. Canadian cities have seen all of these in recent years, from the 2021 Lytton fire and the Pacific Northwest heat dome to repeated flooding in Calgary, Toronto, and the Maritimes.

Mitigation and adaptation are the two halves of urban climate policy. Mitigation means reducing emissions through transit investment, building retrofits, electrification, district energy, tree canopy, and denser, more walkable land-use patterns — essentially the same bundle that good planning was already recommending on other grounds. Adaptation means designing for the climate that is already coming: green infrastructure to absorb stormwater, cool roofs and shaded streetscapes, wildfire buffers, resilient grids, updated floodplain maps, and emergency-response planning for heat and smoke events.

Julian Agyeman’s concept of “just sustainabilities” insists that environmental goals cannot be separated from equity ones. A climate strategy that retrofits wealthy neighbourhoods while poor districts swelter without trees, or that raises housing prices near new transit lines until low-income residents are displaced (“green gentrification”), is not actually sustainable because it is not actually just. Indigenous knowledge systems, which have managed landscapes like fire-adapted forests for millennia, are increasingly recognized as climate expertise, not folklore. The hardest planning question of the next generation is not whether cities should act on climate — the case is overwhelming — but how to act fairly, quickly, and democratically, given the unequal starting points of different neighbourhoods and different nations.

Chapter 15 — Smart Cities and Technology

The “smart city” is the current catch-all for applying digital technology to urban management: sensors in pavement and streetlights, real-time transit apps, predictive policing algorithms, facial-recognition cameras, dynamic traffic signals, data dashboards in city halls, and platforms that match riders to drivers or guests to hosts. Proponents promise efficiency, responsiveness, and evidence-based policy. Sceptics worry about surveillance, privacy, the enclosure of public data by private firms, algorithmic bias, and the risk that optimization replaces politics.

Sidewalk Toronto, the Alphabet-affiliated proposal for Quayside on Toronto’s waterfront, became an international case study. Announced in 2017 with a vision of sensor-rich “innovation district” urbanism, it encountered intense public pushback over data governance, consent, and the appropriate role of a private tech company in shaping a public waterfront. Sidewalk withdrew in 2020. The episode crystallized a lesson: smart-city tools are not neutral add-ons to planning but embed assumptions about privacy, ownership, and democratic process that deserve explicit debate.

Technology also reshapes more mundane planning practice. Geographic Information Systems (GIS) let planners visualize inequality and accessibility at fine resolution. Digital twins simulate how new buildings will shadow streets or strain stormwater systems. Online engagement tools can broaden participation — or narrow it to whoever has broadband and free time. The pandemic accelerated working from home and e-commerce, which in turn reshaped downtown office markets, suburban logistics landscapes, and transit ridership in ways cities are still absorbing. A mature stance on smart cities treats digital tools the way previous generations of planners learned to treat highways and towers: as powerful instruments whose benefits depend entirely on who controls them, what values they encode, and whether the communities they transform were genuinely part of the decision.

The course’s closing question — what is planning for? — comes back into focus. The evolution of cities, from Çatalhöyük to Quayside, is a story of people negotiating how to live together in shared space under constantly changing technological, economic, and ecological conditions. Planning is the formal name for that negotiation. Doing it well means learning from history without being trapped by it, taking equity and sustainability as non-negotiable, and remaining honest about the ways the profession itself has sometimes made things worse. Cities will keep transitioning. The work is to steer those transitions toward outcomes that are livable, just, and democratically chosen.