How to use the lease renewal option deadline calculator
Enter your lease expiration date and the notice periods written into the option clause, then add the renewal term length and how many options remain. The tool returns the date the notice window opens, the last day to exercise, days remaining, the renewal term dates and the outside date if every option is used.
Legal basis (September 2026) — There is no statutory renewal right for commercial tenants in the United States. Unlike the Korean Commercial Building Lease Protection Act, which gives a renewal demand right within a window of six to one month before expiration and caps the total term at ten years, US commercial tenancies are governed by contract. The option clause supplies the notice window, the form of notice and the renewal rent formula, and the common law rule is that an option is strictly construed against the party exercising it. A handful of jurisdictions add local commercial tenant ordinances, so check your state and city rules.
Because holdover rent is often set at 150 to 200 percent of base rent, missing the notice date can be expensive even when the landlord is willing to keep you.
This calculator is for reference only and is not legal advice. Consult a licensed attorney about your specific situation.
Frequently asked questions
No. Korea gives commercial tenants a statutory renewal right capped at ten years, but no equivalent exists under US federal law and commercial leases are generally not covered by tenant protection statutes. Any renewal right comes from the option clause in the lease.
The option usually lapses and the lease ends on its stated expiration date. Some courts grant equitable relief where the tenant made substantial improvements and the landlord suffered no prejudice, but that outcome is uncertain and fact specific.
Follow the notice clause exactly, including the address, the delivery method and any copy-to requirement. Sending by a method that produces proof of delivery, and keeping that proof, avoids most later disputes about timing.