In commercial real estate, attornment is the tenant’s formal acknowledgment of a new owner as the landlord after the property changes hands. The lease continues on its existing terms — same rent, same duration, same obligations — and the tenant simply starts paying and dealing with the new owner instead of the old one. The concept matters most when a building is sold or goes through foreclosure, because both buyers and lenders need to know rental income will keep flowing without renegotiation.
What Attornment Actually Does
When a commercial property transfers, the lease doesn’t disappear with the old landlord. The new owner steps into the previous landlord’s position, and attornment is the mechanism that makes the handoff official. It creates a direct contractual relationship between the tenant and the successor landlord in place of the old one.
Everything in the original lease carries over. Rent, maintenance duties, permitted uses, insurance requirements, and the remaining term all stay the same. A change in ownership isn’t an opening to renegotiate, and it isn’t grounds for the tenant to walk away or for the new landlord to impose different terms. In modern practice, attornment is handled through clauses negotiated into the lease or a related agreement up front, not through case-by-case consent after a sale.
When Attornment Comes Up
Property Sales
The most common trigger is a straightforward sale. When one owner sells a commercial building to another, the buyer needs confidence that existing tenants will continue paying rent and performing under their leases. The deed transfer carries the landlord’s interest in every active lease, and the tenant recognizes the buyer as the party now entitled to collect rent and run the building.
Foreclosure
Foreclosure is trickier. If a landlord defaults on a commercial mortgage, the lender or a third-party buyer takes ownership through the foreclosure sale. Whether the tenant’s lease survives depends on timing: a lease signed before the mortgage was recorded is generally senior and survives, while a lease signed after the mortgage is subordinate and can be wiped out unless the tenant has separate protections in place.
When the lease does survive, attornment is what keeps the relationship intact. The tenant recognizes the lender or auction buyer as the new landlord and continues under the existing lease.
SNDA Agreements: Where Attornment Lives in Practice
Rather than leaving any of this to chance, commercial transactions typically use a three-part contract called a Subordination, Non-Disturbance, and Attornment agreement, or SNDA. It’s negotiated among tenant, landlord, and lender, and it addresses what happens to the lease if the mortgage goes bad. Lenders routinely require SNDAs as a condition of financing.
Subordination
The subordination clause makes the tenant’s lease junior in priority to the lender’s mortgage, even if the lease was signed first. Without it, a pre-existing lease would sit ahead of the mortgage, complicating any future foreclosure. In agreeing to subordination, the tenant gives up that priority — but gets something important in return.
Non-Disturbance
The non-disturbance clause is the tenant’s core protection. The lender promises that if the landlord defaults and the lender forecloses, the tenant won’t be evicted and the lease won’t be terminated, as long as the tenant is current on rent and not otherwise in default.
Without this clause, a tenant whose lease is subordinate to the mortgage could lose occupancy entirely after foreclosure. The new owner could terminate the lease and require the tenant to vacate. For any business that has invested in build-outs, signage, or a specific location, that outcome can be devastating.
Attornment
The attornment clause is the tenant’s advance commitment to recognize whoever ends up owning the building — a lender after foreclosure, a buyer at auction, or a later purchaser — as the new landlord. Signing it up front eliminates uncertainty for the lender and for any future buyer.
Standard SNDA language requires the tenant to keep performing under the lease on unchanged terms. Many agreements also require the tenant to sign a formal acknowledgment within a short window — often ten to fifteen business days — after written notice of the ownership change. Missing that window can be treated as a technical lease default.
What Happens Without an SNDA
If there’s no SNDA and the mortgage was recorded before the lease, the tenant’s position after foreclosure is weak. The lease is subordinate by default, and the foreclosing lender has no obligation to honor it. The lender can terminate the lease, demand new terms, or require the tenant to leave.
The absence of an attornment clause also cuts the other way. Without one, a tenant may have no obligation to stay and could potentially walk away rather than recognize the new owner. Lenders lose guaranteed rent; tenants lose guaranteed space. That mutual risk is why lenders insist on SNDAs, and why tenants should push for them as well — the non-disturbance protection alone usually justifies the negotiation.
Estoppel Certificates at Closing
Alongside an SNDA, a tenant caught up in a property transfer is often asked to sign an estoppel certificate. If the SNDA governs future rights, the estoppel certificate captures the lease’s current status at the moment of the transaction. A buyer or lender uses it to verify key facts without digging through the full lease file.
A typical estoppel certificate asks the tenant to confirm:
- The current rent, including any common area maintenance charges
- The lease start date, expiration date, and any renewal options
- The security deposit amount and whether any has been applied
- Whether either party is in default
- Any amendments to the original lease
- Any prepaid rent, free rent, or other concessions not obvious from the lease itself
Once signed, the certificate is binding. A buyer or lender will rely on it, and accuracy matters. A tenant who signs a certificate saying there are no outstanding landlord defaults generally cannot later claim the old landlord owed money for unfinished improvements or other obligations. The certificate is the moment to raise those issues, not after closing.
What the New Landlord Owes You
After attornment, the successor landlord takes on the original landlord’s role going forward. That means delivering whatever services the lease requires — maintaining common areas, providing utilities, handling repairs — on the same terms as before. The tenant’s obligations stay identical.
Problems that existed before the transfer are a different matter. Successor landlords are generally not liable for the previous owner’s breaches. If the former landlord failed to complete a promised build-out, skipped required maintenance, or owed the tenant money, the new owner is typically shielded from those claims, and the tenant’s recourse runs against the former landlord. The division of liability is governed by state law and the sale agreement itself, which is another reason to flag any unresolved issues in the estoppel certificate before closing.
Bankruptcy is the main exception. When a bankruptcy trustee assumes and assigns an unexpired lease, the trustee must first cure any existing defaults or give adequate assurance that they’ll be cured promptly, and must compensate the other party for any actual financial loss from past defaults. Once the lease is assigned, the new party takes over future obligations and the bankrupt estate is released from liability for anything that happens afterward.1Office of the Law Revision Counsel. 11 U.S. Code 365 – Executory Contracts and Unexpired Leases
Security Deposits During a Transfer
When commercial property changes hands, the outgoing landlord is generally expected to transfer tenant security deposits to the new owner, who then becomes responsible for holding them and returning them under the lease. The specific rules vary by state, but the underlying principle — that the deposit follows the property — is widely recognized.
Trouble starts when the prior landlord doesn’t actually hand over the deposit and the new owner claims never to have received it. Some states hold the new owner responsible either way; others leave the tenant to pursue the former landlord. The best protection is confirming the deposit amount and the fact of transfer in both the estoppel certificate and any attornment acknowledgment signed during the transition.
What to Negotiate Before Signing
Commercial tenants often have more leverage over SNDA terms than they realize, especially when the landlord needs the tenant’s signature to close a financing deal. Protections worth asking for include:
- Recognition of all lease rights by the successor landlord, including renewal options, expansion rights, and exclusive-use provisions, not just rent terms
- Explicit treatment of outstanding tenant improvement allowances or reimbursements, so the successor is on the hook for them
- Notice of any landlord mortgage default and a reasonable period for the tenant to cure it before foreclosure strips away tenant protections
- Clear language on how security deposits transfer and confirmation of the successor’s responsibility for returning them
A subordination clause is not a formality. It downgrades the tenant’s priority position, and it should only be signed when paired with non-disturbance language strong enough to guarantee the lease survives foreclosure. Read the SNDA carefully, and treat the negotiation as part of the lease itself.