SNDA stands for Subordination, Non-Disturbance, and Attornment. It is a three-part agreement that defines the relationship between a commercial tenant, the landlord, and the lender (or future owner) of the property. SNDAs are among the most consequential documents in commercial leasing -- and among the least understood by the tenants who sign them.
Each of the three components has distinct legal implications. A tenant who signs an SNDA without understanding all three parts may inadvertently waive important protections.
Why SNDAs Exist
When a landlord finances a property acquisition or refinancing, the lender takes a security interest in the property -- typically a mortgage or deed of trust. That security interest is superior to interests in the property created after the mortgage was recorded. Leases signed after the mortgage was recorded are junior to the mortgage in the priority chain.
If the landlord defaults on the mortgage and the lender forecloses, what happens to the tenants? Without an SNDA, a lender foreclosing on a property could potentially terminate junior leases as part of the foreclosure. Tenants who are not in default and who have invested substantially in their spaces could find themselves with no legal right to remain.
The SNDA resolves this by establishing a contractual agreement among the three parties: the lender agrees not to disturb non-defaulting tenants; the tenant agrees to recognize the lender or a new owner as the new landlord; and the tenant agrees that its lease is subordinate to the mortgage.
The Three Components
Subordination
The subordination component formalizes the priority relationship between the lease and the mortgage. By signing the subordination, the tenant acknowledges that its leasehold interest is junior and inferior to the lender's mortgage.
The practical effect: if the landlord defaults on the mortgage and the lender forecloses, the lender's rights take priority over the tenant's rights. Without the non-disturbance component, this priority could mean the tenant's lease is extinguished by the foreclosure.
Many commercial leases already contain an automatic subordination provision in the lease document itself, making the lease automatically subordinate to any mortgage placed on the property. Whether automatic or contractual, subordination does not protect the tenant -- it is the price the tenant pays for the protections in the other two components.
Non-Disturbance
Non-disturbance is the most valuable component of the SNDA for the tenant. In the non-disturbance agreement, the lender (or successor owner) agrees that if the lender forecloses on the property, the tenant's lease will not be terminated and the tenant will not be disturbed in its possession -- provided the tenant is not in default under the lease.
This is the condition that matters: the protection applies only to tenants who are not in default. A tenant who is in rent arrears, holding over without authorization, or breaching other material lease obligations does not receive non-disturbance protection. The lender can terminate a defaulting tenant's lease through foreclosure regardless of the SNDA.
For non-defaulting tenants, the non-disturbance agreement provides real security: the lease survives the foreclosure, the new owner takes the property subject to the existing lease, and the tenant continues in possession under the same lease terms.
Attornment
Attornment is the tenant's agreement to recognize the new owner -- the lender or whoever purchases the property at foreclosure -- as the new landlord. After a foreclosure, the original landlord no longer owns the property. Attornment ensures the tenant is legally bound to the new owner under the existing lease terms, and the new owner is bound to the tenant.
Without attornment, there could be uncertainty about whether the lease relationship survives the ownership change. With attornment, both the tenant and the new owner are clear: the lease continues, the rent is now payable to the new owner, and the lease terms remain in effect.
When SNDAs Are Required
SNDAs are required in three primary circumstances:
At lease commencement. If the property is already mortgaged when the tenant signs the lease, the lender will typically require all tenants to sign an SNDA as a condition of closing the loan. This protects the lender's collateral value by ensuring that the existing tenant base will continue paying rent regardless of what happens in a foreclosure scenario.
At refinancing. When the landlord refinances existing debt, the new lender requires SNDAs from all tenants at or above a defined size threshold. The refinancing closes after SNDAs are executed.
At acquisition. When a property is sold, the buyer (and the buyer's lender) may require SNDAs from major tenants as a condition of closing. This confirms that the lease portfolio -- which is the basis for the property's value -- is intact and will survive the ownership transfer.
The lease itself typically contains an obligation requiring the tenant to execute an SNDA within a defined period (often 10 to 20 days) of a landlord request. Refusal to execute can constitute a tenant default.
Negotiating Non-Disturbance Protections
The non-disturbance component is negotiable beyond its basic form. Tenants with significant leverage should negotiate enhanced protections:
Successor landlord obligations. A standard SNDA non-disturbance clause protects the tenant from lease termination but may not require the new owner to fulfill all of the prior landlord's outstanding obligations -- pending TI reimbursements, warranty obligations, ongoing construction commitments. Negotiate specific language requiring the new owner to perform all outstanding landlord obligations, not just those arising after the foreclosure date.
Credit for rent paid in advance. If the tenant has prepaid rent or provided a security deposit, the successor owner should be obligated to credit those amounts. A lender or buyer who takes the property in foreclosure and also collects full rent from a tenant who has prepaid is collecting twice. SNDA language protecting pre-paid amounts should be standard.
No modification without consent. The SNDA may permit the lender to require lease modifications as a condition of non-disturbance. Negotiate limitations on what modifications the lender can require -- ideally, no modifications that materially and adversely affect the tenant's economic position.
Bilateral non-disturbance language. Standard SNDAs run from the lender to the tenant. Negotiate language that also protects the tenant against disturbance from any other party claiming an interest in the property, not just the named lender.
What Happens Without an SNDA
A tenant without an executed SNDA is in a precarious position in a foreclosure scenario. Depending on the jurisdiction and the priority of the lease versus the mortgage, the tenant's lease may be extinguished by the foreclosure, leaving the tenant with a claim against the former landlord but no right to remain in possession.
For tenants who have invested heavily in tenant improvements, built a customer base at a specific location, or signed long-term leases in reliance on the stability of the space, the loss of the lease in a foreclosure without an SNDA represents a material risk. Every commercial tenant should confirm that an executed SNDA is in place before the landlord places or refinances debt on the property.
Finding SNDA Provisions in a Lease Abstract
A complete lease abstract should identify whether an SNDA has been executed and, if so, with which lender. The abstract should capture the SNDA date, the lender's identity, the non-disturbance conditions, and any specific successor landlord obligations negotiated into the agreement.
For properties without an executed SNDA on file, the abstract should flag the absence so the tenant can evaluate whether to request one from the current lender. SNDAs are sometimes granted after lease commencement, particularly in the context of a refinancing where the tenant's cooperation is requested.
The SNDA is one of the documents that, alongside the lease and estoppel certificate, defines the complete legal relationship governing a tenant's right to occupy commercial space. Treating it as routine paperwork is a mistake -- the consequences of inadequate non-disturbance protection become apparent only in a foreclosure, at which point the time for negotiation has passed.