The Missing Middle: What Cities Outlawed

Walk through the older neighbourhoods of Toronto or Vancouver and you will find them: pre-war triplexes, low-rise walk-up apartments, corner buildings with shops below and flats above. They are often the most beloved blocks in the city — and, for most of the past seventy years, it has been illegal to build more of them. Across vast tracts of urban Canada, zoning has reserved residential land for detached houses, a pattern critics call the 'yellowbelt.' The result is a housing market that offers a condominium tower, a million-dollar house, and remarkably little in between. Planners call the absent category the missing middle: duplexes, triplexes, rowhouses, and small apartment buildings that once appeared wherever demand justified them. Their disappearance was not a verdict of the market but a decision of regulation. Early twentieth-century zoning was often explicitly exclusionary, designed to keep apartments — and the tenants they implied — out of homeowner districts, and the machinery long outlived the rhetoric. Minimum lot sizes, parking requirements, and discretionary review each added cost and delay until the modest infill building became uneconomic almost everywhere. Whether more market housing helps affordability is the field's noisiest debate. Supply skeptics observe that new construction is expensive and conclude that building 'luxury' units cannot help those struggling; some argue new development attracts wealthier residents and accelerates displacement. Researchers who track 'migration chains' find otherwise: each new market-rate building triggers a sequence of moves that, within a few years, opens up cheaper units elsewhere in the region — a process economists call filtering. Both camps hold a piece of the truth, because filtering is real but slow, regional rather than local, and cold comfort to a tenant facing eviction this year. The time horizon, more than the evidence, is what divides them. Every policy instrument carries its own trade-off. Rent control protects sitting tenants from displacement, but where it is strictest it can discourage new rental construction and reward staying put over moving. Inclusionary zoning obliges developers to include below-market units, yet if the requirement is set too high it operates as a tax that quietly stops projects from being built at all. Even upzoning, the reform of the moment, can inflate land prices as owners capitalize the new development rights — which is why economists increasingly pair it with land-value capture, so that some of the windfall funds the infrastructure and affordable housing that newcomers will need. Canadian cities have begun dismantling the old rules: Toronto and Vancouver have legalized multiplexes citywide, and federal financing now nudges municipalities toward higher permitted densities. The early results are instructive rather than triumphant — applications number in the hundreds, not the thousands. Legalization, it turns out, is necessary but not sufficient; financing costs, a shortage of skilled trades, and slow approval timelines still decide what actually gets built. The broader lesson is that housing is a system, and systems disappoint anyone seeking a single villain or a single fix. Zoning reform without construction capacity yields permissions without buildings; subsidies without supply bid up the price of what already exists; supply without tenant protection abandons today's renters for tomorrow's. Policy maturity in this field means holding several partial truths at once.