The 3-Bedroom Arbitrage: An Under-Supplied Rental Unit
The short answer: on the same floor plate, a 3-bedroom unit rents for $300–400+ more per month than a 2-bedroom — matched closed-lease comps support it across Toronto — yet almost every new multiplex is designed with 2-bedroom floors. The unit type nobody builds is the one the market pays the biggest premium for.
Updated August 2026 · MBL Developments
The data
Track closed leases (not asking prices) across the sixplex wards and one pattern repeats in every pocket: family-sized units are scarce and command disproportionate rents. Across the sixplex wards, 2026 closed 3-bedroom leases run $4,000–4,600 while 2-bedrooms close $3,950–4,195 — and the 3-bedroom supply is a fraction of the demand, because the units barely exist. Purpose-built family-sized rentals are nearly extinct: condos optimize for units-per-floor, and older stock chops houses into small suites.
Meanwhile the tenants exist in force: families priced out of buying, staying renters longer, wanting walkable neighbourhoods and school catchments — with almost nothing built for them.
Why builders get this wrong
A full-floor 3-bedroom versus a 2-bedroom on the same ~1,050 sq ft plate costs roughly a wall and a door more to build — and earns $300–400+ more per month, forever. Capitalize what reaches NOI: after a typical 25% operating ratio that’s ~$225–300/month, so one swapped unit is worth $54–72k of building value at a 5% cap rate. Three floors of it approaches a quarter-million dollars — for the same square footage.
Builders default to 2-bedrooms out of habit, condo logic, and leasing folklore ("small units lease faster"). Faster, sometimes. For less money, always — and in a building you hold for decades, the rent roll is the asset.
The design implications
- Full-floor units win. Zero corridor waste; every buildable foot earns rent. Family tenants pay for the privacy of a floor to themselves.
- The mix is the underwriting. Design the unit mix from local closed-lease data — not from what the last guy built.
- Family tenants are hold-friendly: longer tenancies, lower turnover — exactly what a long-term rental operator wants.
Frequently asked questions
Do 3-bedrooms take longer to lease? Sometimes marginally — the tenant pool is smaller but far less served. Closed data shows them leasing at strong premiums in family neighbourhoods, which is exactly where the sixplex wards sit.
Does this apply across the city? The premium holds broadly; the absolute rents differ. Run the specific area's closed unit medians — the method matters more than any single number.
Why share this? Because the market's been building the wrong units for a decade and the data's been invisible. We underwrite with it either way.
Closed-rent data monthly, real build costs, the financing nobody explains.