SNDA & Subordination When Assuming a Lease
If the landlord’s lender forecloses, an SNDA is what keeps your inherited lease alive — confirm one exists before you take over.
Last reviewed: May 26, 2026 by the BizLeaseCheck Editorial Team
General information, not legal advice.
Overview
Commercial leases are usually subordinate to the landlord’s mortgage, which means a lender that forecloses could, in principle, wipe out the lease. A subordination, non-disturbance, and attornment agreement (SNDA) is what protects the tenant from that outcome.
When you assume a lease, you should confirm whether an SNDA exists and whether it runs to you.
Topics to check
Subordination ranks the lease behind the lender’s mortgage. A subordination agreement guarantees that a senior interest is paid before junior ones — applied to leases, it means the mortgage takes priority, so a foreclosure could extinguish a subordinate lease and the tenant’s right to stay.
That is the risk an SNDA is designed to fix.
Subordination agreement (Cornell LII Wex)The "non-disturbance" piece is the protection: the lender agrees that, as long as the tenant is not in default, it will not disturb the tenant’s possession even if it forecloses. "Attornment" is the tenant’s reciprocal agreement to recognize the lender (or foreclosure buyer) as the new landlord. Together, an SNDA keeps the lease alive through a foreclosure.
Without non-disturbance, a subordinate lease can be terminated in a foreclosure, leaving the tenant without the space it just paid to take over.
Check whether an SNDA already exists and whether it benefits assignees (you), or whether the lease entitles you to request one. If the property carries debt and there is no non-disturbance protection, factor that risk in and consider requesting an SNDA as part of the landlord-consent process.
Confirm the estoppel and SNDA are consistent with the lease before closing.
Key takeaways
- Leases are usually subordinate to the landlord’s mortgage, so a foreclosure can threaten the lease.
- An SNDA combines subordination, non-disturbance, and attornment to keep the lease alive.
- Non-disturbance is the key protection: the lender won’t evict a non-defaulting tenant after foreclosure.
- Attornment is the tenant recognizing the foreclosure buyer/lender as the new landlord.
- When assuming a lease, confirm an SNDA exists or that you can request one.
Official resources
Legal-review notes
Guide confidence marker: Medium confidence.
- SNDA availability and effect depend on the lease, the loan documents, and state law; confirm with counsel.
- Whether an existing SNDA benefits an assignee is a wording question; have an attorney review it.
Frequently asked questions
What is an SNDA?
A subordination, non-disturbance, and attornment agreement. It subordinates the lease to the landlord’s mortgage, but the lender agrees not to disturb a non-defaulting tenant’s possession if it forecloses, and the tenant agrees to recognize the lender or buyer as the new landlord. It keeps the lease alive through a foreclosure.
Why does subordination matter when I take over a lease?
Because a lease subordinate to a mortgage can be extinguished if the lender forecloses, costing you the space you just assumed. Non-disturbance protection (via an SNDA) prevents that, so confirm an SNDA exists or that the lease lets you request one — especially if the property carries debt.
What is attornment?
Attornment is the tenant’s agreement to recognize a new owner — typically the lender or a buyer at foreclosure — as its landlord and to continue the lease with them. It is the reciprocal of the lender’s non-disturbance promise in an SNDA.