Estoppel Certificate and SNDA in Commercial Leasing (2026)

Two documents that travel together, doing different jobs In commercial leasing, an estoppel certificate and an SNDA (subordination, non-disturbance and attornment agreement) show up together, usually when a landlord is selling the building or refinancing it, but they do opposite things. The estoppel certificate looks backward: it is the tenant's signed snapshot of where the lease stands today. The SNDA looks forward: it sets what happens to the tenant's lease if the landlord's lender forecloses in the future. A buyer or a lender almost always wants both, and a tenant asked to sign them should understand what each one gives away and what it can ask for in return. This article is general guidance, not legal advice. The law here varies by jurisdiction, so have a qualified professional review your specific deal before you rely on it. ## The estoppel certificate An estoppel certificate is a statement, signed by the tenant (sometimes the landlord), confirming the key facts of the lease so a third party can rely on them. It typically confirms: - the lease is in effect and has not been amended except as stated;

• the current rent, any prepaid rent, and the security deposit held;
• the lease start and end dates and any renewal or extension options;
• that the landlord is not in default and owes no outstanding work or allowances;
• that the tenant has no claims, offsets or defences against the rent;
• any side letters or special arrangements. Once signed and relied upon, the tenant is generally prevented (estopped) from later contradicting those facts against the party that relied on them. That is the whole power of the document, and the reason to fill it in carefully. If the landlord in fact owes you an unfinished fit-out or a rent credit, say so on the certificate; do not certify "no default" to be helpful, because you may lose that claim against the new owner. Watch for a "deemed estoppel" clause in the lease that treats your silence past a deadline as confirmation of whatever the landlord asked you to confirm. ## The SNDA, part by part An SNDA is a three-party agreement among the tenant, the landlord and the landlord's lender. Its name is its three moving parts: - Subordination ranks the lease behind the lender's mortgage. Lenders want this so that a lease cannot sit ahead of their security. Without subordination, a pre-existing lease could outrank the loan.
• Non-disturbance protects the tenant. The lender promises that, as long as the tenant is not in default, it will not disturb the tenant's possession if it forecloses. This is the tenant's prize in the deal.
• Attornment requires the tenant to accept whoever takes title on foreclosure as its new landlord, so the lease and the rent continue on the same terms with a different owner. The core bargain is a trade: the tenant agrees its lease is junior to the loan (subordination), and in exchange the lender agrees not to kick the tenant out if it forecloses (non-disturbance). A tenant should be wary of subordinating without getting non-disturbance in return, because bare subordination could let a foreclosing lender wipe out the lease. ## What each party should negotiate Tenant. Insist that non-disturbance is genuine and not loaded with waivers. Seek carve-outs so the foreclosing lender remains responsible for the security deposit, honours prepaid rent, completes or credits any landlord work, and is bound by renewal options. Resist clauses that let the new owner ignore offsets you were entitled to. Landlord. Expect to deliver estoppels and SNDAs as a condition of a sale or a loan, and build a reasonable tenant-response deadline into the lease so one slow tenant cannot hold up a closing. Lender or buyer. Use the estoppel to confirm the rent roll and catch side deals, and use the SNDA to lock in the income stream after foreclosure while keeping good tenants in place. ## How the two fit together | | Estoppel certificate | SNDA | |---|---|---| | Direction | Backward (today's facts) | Forward (on foreclosure) | | Parties | Tenant (to buyer/lender) | Tenant, landlord, lender | | Protects | Buyer/lender relying on facts | Tenant's possession, lender's priority | | Main risk | Certifying away a real claim | Subordinating without non-disturbance | A deal can use both at once: the estoppel confirms where the lease stands now, and the SNDA governs what happens if the property changes hands through foreclosure. ## A note on jurisdiction Estoppel certificates and SNDAs are most developed in United States commercial real estate practice, where lender-driven financing makes them routine. The same concepts appear in other common-law markets (UK, Ireland, Singapore, Australia) under local names and with different mechanics, and the priority between a lease and a mortgage, and the protection a tenant gets on enforcement, varies by jurisdiction. In India, lease and mortgage priority is governed by the Transfer of Property Act, 1882 and registration law, and SNDAs are less standardised. Because the effect of signing is binding, have local counsel review the document before you sign. Last verified October 2026. ## Where one contract workspace helps Estoppels and SNDAs turn up at the worst moments, mid-sale or mid-refinance, with a tight deadline and a request to certify facts you have to get exactly right from the lease, its amendments and its side letters. Pulling those facts together accurately, under time pressure, is the real task. One AI workspace tuned to your company can hold that work in a single place: it reads an estoppel certificate or SNDA against the lease, its amendments and its side letters, marks each position as favourable, neutral or unfavourable to you, and keeps every version and open action on one timeline so a tight deadline does not force a rushed certification. Adira is one AI workspace built for reviewing leasing documents like these. The checklist above is enough to work through one of these documents on your own; a workspace just makes reviewing, editing and tracking one connected job.