A renewal option is not a right that survives on its own. Ontario’s Commercial Tenancies Act creates no statutory renewal entitlement — the option lives entirely in the lease clause, and missing the notice window is the single most common way a tenant loses it.
Key takeaways
A renewal option reads like a right the tenant already has. In an Ontario commercial lease it usually isn’t one yet — it is a right to acquire a right, conditional on the tenant doing something specific by a specific date. The Commercial Tenancies Act does not create a statutory renewal entitlement the way some residential regimes protect a sitting tenant; whatever notice mechanic the lease spells out is the entire deal. For a landlord or property manager holding a portfolio of leases, that makes tracking every option window a collections-grade discipline, not a calendar nicety — a missed window is not a minor administrative slip on either side of the deal.
The clause typically requires written notice within a defined window before the then-current term expires — commonly “not less than nine months and not more than twelve months” before expiry, though the exact figures vary lease to lease and have to be read off the document, not assumed. If notice is not delivered inside that window, the option simply lapses. There is generally no statutory relief from a missed commercial notice deadline the way a residential tenant might have recourse through the Landlord and Tenant Board — commercial leasing sits outside LTB jurisdiction entirely, so the lease clause is close to the whole of the law here. A landlord who wants certainty at expiry, rather than an argument about whether late notice should still be honoured, tracks the window and the day it closes as two separate calendar events, not one.
Worked example — opening and closing the window
A five-year term expires June 30, 2027. The option clause requires notice “not less than nine months and not more than twelve months prior to expiry.”
Twelve months before June 30, 2027 is June 30, 2026 — the window opens. Nine months before is September 30, 2026 — the window closes. Notice delivered on September 29, 2026 is valid; notice delivered on October 1, 2026 is not, and the option has lapsed regardless of how close it was.
Delivering notice inside the window is necessary but not always sufficient. Most renewal clauses condition the option on the tenant not being in default — at the moment notice is given, at the start of the renewal term, or both, depending on the drafting. That is the reason a landlord tracking renewal deadlines gets more value from also tracking outstanding arrears against the same tenant where the lease has a comparable operating-cost structure, or simply cross-checking the rent ledger before treating a notice as effective: a tenant who exercised on time but was two months behind on rent at the renewal date may not have actually secured the option at all, and that is a determination worth making before the space is taken off the market. Where a landlord does treat the option as void for default, the remedies available from there — distress, termination, or pursuing arrears while the tenancy continues — are governed by the Commercial Tenancies Act, not the residential regime, which is one more reason a commercial default is handled differently than a residential one even where the fact pattern looks similar.
A renewal option rarely just repeats the expiring rent. The clause typically sets renewal rent one of three ways: at prevailing market rent for comparable space at the time of renewal, at market rent with a floor that guarantees it will not fall below the expiring rate, or by a fixed formula agreed at signing, such as a CPI-indexed step. Market-rent renewals are where most disputes actually surface, because “market” is an opinion until an appraisal or arbitration process (often written into the same clause) resolves it — which is one more reason the notice-window question and the rent-setting question need to be tracked as connected parts of the same clause, not read in isolation.
A landlord or property manager holding a handful of leases can track option windows against a calendar reminder for each one. That approach breaks down past a certain portfolio size, because every lease carries its own window length, its own reference date, and often its own definition of what counts as timely delivery of notice — some clauses require notice to be received by the landlord inside the window, others only require it to be sent. A tracking system built around the lease abstract — the same document that carries the rent structure and TMI basis — rather than a standalone calendar entry, keeps the option window connected to the rest of the lease terms that determine whether the option can actually be exercised, including default status and any assignment history that might affect whether the current tenant still holds the right at all. It is the same reason a full clause-by-clause lease review is worth doing at signing rather than only when a dispute forces a re-read: the renewal clause's exact wording is what decides how strictly the window is enforced later.
The operational risk runs in both directions. A landlord that miscalculates a window and treats a validly exercised option as lapsed risks a dispute over holding the tenant to a new lease it never agreed to. A landlord that fails to flag an approaching window at all loses the planning runway to remarket the space if the tenant doesn’t renew — the same runway a leasing package needs to be assembled and marketed properly if the unit is coming back onto the market. Either failure mode argues for tracking the window well before it opens, not scrambling once it does.
This is a genuinely disputed area rather than a settled rule — continuing to accept rent can be argued as conduct implying a new tenancy on the old terms, but it does not automatically revive a lapsed option. A landlord who wants certainty documents its position in writing rather than relying on silence or on the fact of accepted payment to speak for itself.
It can — a lease with a second or third renewal term sometimes shortens or shifts the window for later options, so each option in a multi-option lease needs to be read and tracked on its own terms rather than assumed to repeat the first one.
A landlord can choose to honour late notice, but doing so as an unwritten courtesy creates ambiguity about whether it is a one-time accommodation or a new pattern. Where a landlord intends to accept late notice, confirming that in writing protects the position for any future renewal under the same lease.
Generally yes, unless the clause states the option is personal to the original named tenant — a detail worth checking at the assignment stage, since the same silence-versus-consent question comes up when a unit is assigned, not just when it is first leased.
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