November 3, 2026 · The Vespy Team
Renewal Options in Commercial Leases: Notice Windows and Fair Market Rent
How renewal option notice windows work, what happens when a tenant misses one, and how fair market rent is set when an option is exercised.
Part of Commercial Lease Administration: What It Covers and How to Run It .
A renewal option gives a tenant the right to extend its lease, but only if it gives notice within the window the lease sets. Miss the window and the option usually lapses, which is why option dates are among the most important critical dates in a portfolio.
Reading the option clause
Every renewal option answers the same questions. Abstract each one explicitly:
| Term | Example |
|---|---|
| Number of options | Two |
| Length of each | Five years |
| Notice window | No earlier than 12 months and no later than 9 months before expiration |
| Form of notice | Written, delivered to the notice address, by certified mail or courier |
| Rent | 95% of fair market rent, not less than the rent in the final lease year |
| Conditions | No default at the time of notice or at commencement of the renewal |
| Personal or transferable | Personal to the original tenant |
Each line can decide whether an exercise is valid. A notice emailed when the lease requires certified mail, or sent while the tenant is in default, can be challenged.
Calculating the window
For a lease expiring December 31, 2027, with notice due “not earlier than 12 months nor later than 9 months before expiration”:
Earliest notice January 1, 2027
Latest notice March 31, 2027Some windows are a single deadline (“at least 180 days before expiration”); others have both ends, as here. Notice sent too early can be as defective as notice sent too late.
Set reminders well ahead of the window, not on it. A reminder 30 days before the last day leaves no time for the tenant’s internal approvals, or for the landlord to plan for a vacancy.
Why landlords track tenant options
It is the tenant’s option, but the landlord has as much at stake:
- Leasing plans. An expiring anchor tenant changes the marketing plan for the whole center.
- Financing and sale. Buyers and lenders want to know which options are open and when.
- Rollover exposure. Option dates are what turn a list of expirations into a real rollover forecast. See modeling escalations across a rollover schedule.
- Fair market rent negotiations. Preparing comparables takes time. Starting when notice arrives is late.
Fair market rent mechanics
Most options price the renewal at fair market rent, or a percentage of it, with a process for disagreement:
- Landlord proposes a rent within a set number of days after notice
- The parties negotiate for a fixed period
- If they cannot agree, each appoints a broker or appraiser, and a third decides or averages
Watch the definition of fair market rent. Whether it considers concessions such as free rent and TI allowances, and whether it compares to renewals or to new leases, can move the result materially. Some leases let the tenant rescind its exercise if the determined rent is too high.
Other options to track the same way
- Expansion options and rights of first offer on adjacent space
- Rights of first refusal on space or on a sale of the building
- Termination options, often with a fee and their own notice window
- Contraction options, letting a tenant give back part of its space
Each has a window, a form of notice, and conditions. Each belongs on the same critical date list. Tracking critical dates covers how to keep that list reliable through staff turnover.
The commercial lease administration guide puts options in the context of the rest of the work, and lease administration software tracks each option with reminders before its window opens.