Estoppel Certificate

An estoppel certificate is a signed statement by a tenant confirming the basic facts of its lease — the dates, the rent, whether the lease is in default, whether the landlord owes any money, and similar. Once signed, the tenant is generally "estopped" (legally prevented) from later asserting facts inconsistent with what was certified. Lenders and prospective buyers of the building rely on these statements to underwrite financing or acquisitions.

Why estoppels exist

A buyer or lender of a commercial building cannot read the tenant's mind. Even reading every lease in a stack does not tell them whether there is an unrecorded side letter, a verbal modification, or an unpaid TI reimbursement claim. The estoppel forces each tenant to put on paper, under threat of legal preclusion, what the lease actually says today and what disputes (if any) are pending. The buyer then knows what they are buying, the lender knows what they are lending against, and the seller's representations are corroborated by a third party.

What a tenant typically certifies

A standard estoppel asks the tenant to confirm:

• The lease document and all amendments, dated and listed.
• The lease commencement and expiration dates and any unexercised options.
• Current monthly rent, escalation history, and the next escalation date.
• Whether any rent is prepaid beyond the current month.
• The amount of any security deposit and whether it has been applied.
• That there are no defaults by either party, or describing any defaults.
• That the tenant has accepted the premises and is in occupancy.
• That no claims, offsets, or rebate rights are outstanding.

A well-negotiated lease will include the form of estoppel as an exhibit, so the tenant is not asked to sign a buyer's bespoke version under time pressure during a sale.

What to watch for as a tenant

Read each statement before signing. If the lease has been amended verbally or by side letter, the estoppel must reflect that, otherwise the tenant gives up the right to enforce those side terms against the buyer. If the landlord owes you a TI reimbursement, an unpaid allowance, or a free-rent period that has not been credited, the estoppel must say so. "There are no claims or offsets" sounds neutral, but signed without qualification it can extinguish a real claim.

Be careful about certifying that a future event has been satisfied — for example, that the landlord has completed a delivery condition or a milestone. Certify what is true now, qualify what is not, and add "to tenant's actual knowledge" language where appropriate.

A good lease also caps how often estoppels can be requested (commonly twice per year) and limits the response time to ten business days or so. Without a cap, a churn of refinancings can turn into an administrative drain.

SNDA versus estoppel

Estoppels often arrive bundled with a Subordination, Non-Disturbance, and Attornment agreement (SNDA). The two are different: an estoppel reports facts about the lease, while an SNDA modifies the lease's relationship to a future lender. Sign each on its own merits, even when both are presented together by the lender's counsel.

APAC practice

In Hong Kong and Singapore, estoppel-style confirmations are common in large institutional sales but are not always called "estoppel certificates" — the document may be titled a tenant confirmation letter or a lease status confirmation. The substance is the same.

Japanese practice differs. The lender or buyer's diligence in Tokyo office sales relies more heavily on the seller's representations and direct lease review than on a tenant-signed instrument. Foreign-funded transactions involving J-REITs increasingly request an English-language estoppel as a side condition, and Japanese tenants have, broadly speaking, become accustomed to signing them in international-grade towers.

If your portfolio carries a few hundred leases and you are due for a refinancing, having every lease abstracted with current rent, options, defaults, and amendments cited back to the source PDF makes the estoppel cycle a one-week task instead of a one-month one. LeaseTrace is built for exactly that.