CRE glossary
Estoppel certificate
An estoppel certificate is a signed statement from the tenant confirming key facts about the lease: that the lease is in effect, what the rent is, what's been paid, whether there are any defaults, and whether any side agreements modify the document. The landlord uses estoppels during a building sale or refinance, buyers and lenders need confirmation that the leases are exactly as represented.
Estoppels are routine. Every commercial lease includes an estoppel clause requiring the tenant to sign one within a defined window (typically 10–15 business days) when the landlord requests it. The certificate certifies the lease terms 'as of the date below' and prevents the tenant from later claiming different terms in court, that's the legal meaning of 'estoppel,' to be prevented from asserting something inconsistent with a prior representation.
A bad estoppel clause requires the tenant to certify whatever the landlord drafts. A good estoppel clause requires the tenant to certify only specific factual statements, lets the tenant note exceptions in the certificate, and gives the tenant reasonable time to review (10+ business days). Sign blindly and you can lose claims for landlord defaults, undocumented side agreements, or operating-expense disputes.
When a building is being sold, brokers often see a flurry of estoppel requests. Read every line. Confirm the rent, escalation, term dates, options, TI status, and any unresolved disputes. If there's a pending OpEx audit, note it as an exception. If the landlord owes you free-rent credit, note it. The estoppel becomes the new owner's truth, anything not written there is functionally lost.
Example
- Lease commencement
- March 1, 2024
- Current base rent
- $58.00/SF
- Last paid through
- April 30, 2026
- Outstanding TI balance
- $45,000 (exception)
- Disputes / defaults
- None
Broker perspective
When your tenant gets an estoppel request, treat it like a deal moment, not a paperwork chore. Insist on 10 business days minimum. Mark exceptions for any disputed item. Cross-reference against the original LOI, sometimes the landlord's draft 'forgets' free rent or TI credits. The 30 minutes you spend reviewing this protects 10 years of lease terms.
Frequently asked
People also ask
Do I have to sign an estoppel?
Yes, your lease almost certainly requires it within a defined window (10–15 business days). Refusing to sign is itself a default.
Can I add exceptions?
Yes, and you should. The certificate is meant to be accurate, not flattering to the landlord. Note any unresolved issues, undocumented side agreements, or pending audits.
What if the landlord sends an inaccurate estoppel?
Mark up the document and return with corrections. The landlord may push back, but the estoppel can only be what's true, that's the whole point.
Why does the buyer / lender need this?
They need legal proof of the rent stream they're acquiring or lending against. Without estoppels, they can't underwrite the deal.
Related terms
Subordination, non-disturbance, and attornment (SNDA)
A three-part agreement that protects the tenant's lease if the landlord defaults on its mortgage and the lender forecloses.
Letter of intent (LOI)
A non-binding outline of the major business terms, rent, term, TI, options, that becomes the basis for the binding lease.
Holdover
When the tenant stays past lease expiration without a new agreement, usually triggers a steep rent premium (150–200% of base rent).
Operating expenses (OpEx)
All costs to run the building, taxes, insurance, utilities, janitorial, management, that get passed through to tenants in NNN and modified gross structures.
See estoppel certificate extracted from a real lease.
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