An estoppel certificate is a document your landlord asks you to sign that confirms the current status of your lease — the rent you're paying, whether you're current on payments, whether any disputes exist, and whether the landlord has fulfilled their obligations under the lease.

You'll most likely see one when your landlord is selling the building or refinancing their mortgage. The buyer or lender wants confirmation directly from tenants that the leases are what the landlord says they are.

Why Landlords Ask for It

When a building sells, the buyer is acquiring the landlord's position in every lease in the building. They need to know those leases are accurate. A landlord might represent to a buyer that all tenants are current on rent, that no disputes exist, and that all landlord obligations have been fulfilled. The estoppel certificate asks tenants to confirm — or contradict — that representation directly.

Lenders want the same thing when refinancing. Before they extend a loan secured by the property, they want signed confirmation from tenants that the rental income stream is what the landlord claims.

The document typically asks you to confirm:

the lease commencement and expiration dates
the current monthly rent
that you're current on all payments
that no defaults exist on either side
that the landlord has completed any required buildout or tenant improvements
that you have no claims or defenses against the landlord

Do You Have to Sign It?

Check your lease. Many commercial leases include an estoppel clause requiring you to return a completed estoppel certificate within 10–30 days of the landlord's request. If your lease includes that clause, refusal to sign within the stated timeframe is a lease violation — and some leases specify that your failure to respond is deemed confirmation of the landlord's version of the facts, which is worse than signing.

If your lease doesn't include an estoppel obligation, you're not legally required to sign. But refusing outright without explanation can complicate your relationship with a new landlord, so a better approach is to respond in writing with any corrections rather than going silent.

What to Check Before You Sign

Don't sign an estoppel certificate without reading it carefully against your actual lease. The document is a legal representation, and errors or omissions can be used against you later.

Check the rent amount listed. If there's a free rent period, a rent abatement, or a side letter modifying the stated rent, confirm it's reflected accurately or noted as an exception.

Check the lease expiration date and any renewal options. If you have renewal options that aren't listed, add them. An estoppel that omits your renewal rights could be read as a waiver of those rights by a new landlord or lender who relied on the document.

Check the landlord obligations section. If your landlord owes you a tenant improvement allowance that hasn't been paid, a buildout that hasn't been completed, or any other unfulfilled obligation, do not confirm that all landlord obligations have been satisfied. List the outstanding items explicitly. This is your formal opportunity to put those claims on record — in a document that the buyer or lender will see before the transaction closes.

Check for any active disputes. If you've been disputing a CAM overcharge, a repair obligation, or any other lease issue, note it. Signing an estoppel that states no disputes exist can waive claims you didn't intend to give up.

The Right Way to Handle It

Respond within the required timeframe. If you need corrections, return the certificate with your changes marked — don't just refuse to sign without explanation. Most buyers and lenders will accept a signed certificate with noted exceptions. What they can't work with is silence or an outright refusal.

If the estoppel contains material inaccuracies that the landlord won't correct, consult an attorney before signing. A signed estoppel is a binding representation, and signing a document that misrepresents your lease terms can limit your ability to assert those terms later.

Scan your lease through LiabilityScore™ to find your estoppel obligation — what the timeframe is, what happens if you don't respond, and whether the deemed-confirmed language applies to you.