Short answer: An SNDA (subordination, non-disturbance and attornment agreement) is typically an agreement among a tenant, the landlord and the landlord's lender. The tenant agrees its lease ranks behind the loan (subordination). The lender agrees not to disturb the tenant if it forecloses, as long as the tenant isn't in default (non-disturbance). The tenant agrees to recognize the lender or foreclosure buyer as its new landlord (attornment). Many SNDAs also limit what a future owner is bound by, which affects what property managers need to track.

Most SNDA guides explain the three parts and stop. For landlords and property managers, the more important question is what the SNDA changes. SNDAs often say a lender or foreclosure buyer won't be bound by prepaid rent, unapproved lease amendments or security deposits it never received. Those provisions only matter if foreclosure happens, but they shape how lease changes, prepayments and deposits should be handled today.

This guide covers what an SNDA is, why lenders ask for one, the provisions that affect day-to-day management, and how to run SNDAs alongside estoppel certificates in a refinance.

Must Read: Collecting Tenant Estoppels Before Closing: Timeline, Deadlines and What Happens When Tenants Don't Respond

Table of Contents

1. The SNDA at a Glance

2. Why Lenders Ask for SNDAs

3. Start With the Lease Clause

4. SNDA Provisions That Affect Day-to-Day Management

5. Running SNDAs in a Refinance

6. After Signing: The Lease File

7. If Foreclosure Happens

8. SNDA vs Estoppel Certificate

9. SNDA Checklist

10. Common Mistakes

11. FAQs

The SNDA at a Glance

The parties are usually the tenant, the lender and the landlord. SNDAs are mainly a commercial leasing document.

Why Lenders Ask for SNDAs

The priority between a lease and a mortgage depends on the applicable law, the timing and recording of the interests, and the documents governing them. In some circumstances, foreclosure can terminate or otherwise affect lease interests that rank behind the mortgage. That creates two risks:

• For the lender: a lease that ranks ahead of the mortgage may bind a foreclosure buyer to terms the lender never approved.

• For the tenant: a lease that ranks behind the mortgage could be affected by foreclosure, even if the tenant has done nothing wrong.

The SNDA settles both in advance. The lender gets the priority it negotiated, while the tenant gets contractual protection against disturbance if the conditions in the SNDA are satisfied.

Start With the Lease Clause

Before asking a tenant to sign an SNDA, check what the lease already says. Leases commonly include one or more of these:

• Automatic subordination: the lease is subordinate to present and future mortgages without a separate document.

• A duty to sign on request: the tenant must sign a document confirming subordination when the landlord asks, often within a set number of days.

• Subordination conditioned on non-disturbance: the tenant's subordination only takes effect if the lender signs a non-disturbance agreement.

• A form or "commercially reasonable" standard: limits on what the tenant can be asked to sign.

The lease clause helps determine what the tenant is required to sign, applicable timing requirements, and any limits on the form or terms.

SNDA Provisions That Affect Day-to-Day Management

Beyond the three core parts, SNDAs often limit what a lender or foreclosure buyer takes on. These limits only apply if the lender ends up as landlord, but they affect how leases should be managed now.

The first five rows come from a 2025 SNDA filed with the SEC. The options and notice-and-cure examples come from a 2006 SNDA, also filed with the SEC. The rent-to-lender provision appears in Pennsylvania's state SNDA form, which also has the tenant agree not to prepay rent more than one month in advance. Wording varies by agreement, so read the signed SNDA for each lease.

Lease amendments in practice. If an SNDA requires lender consent for amendments, a rent reduction or term change signed without that consent may not bind a future owner. Check the SNDA before documenting a lease amendment.

Security deposits in practice. Deposit records that clearly show what's held, and where, matter if the property ever changes hands through foreclosure. See How to Manage Security Deposit Accounting.

Running SNDAs in a Refinance

In a refinance, the lender usually asks for SNDAs from some or all tenants, often alongside tenant estoppel certificates. The process is similar:

1. Get the lender's requirements: which tenants, the lender's SNDA form, and the deadline.

2. Check each lease's subordination clause: automatic subordination, duty to sign, conditions, and any form requirements.

3. Prepare and send the SNDA with the lease reference and a response deadline. Larger tenants may negotiate the lender's form.

4. Track every tenant with dates sent, due and returned, and any negotiation points.

5. Collect signatures from the tenant, the lender and the landlord, plus notarization if required.

6. Deliver the set to the lender before the loan closes.

Estoppels confirm the facts of each lease, while SNDAs set what happens if the lender forecloses. For what an estoppel contains, see Tenant Estoppel Certificates: What the Tenant Certifies. The timeline and tracker in the Must Read above work for SNDAs too.

After Signing: The Lease File

Once signed:

• Record it if required. Some SNDAs are recorded in the property records, so the non-disturbance promise binds the lender's successors.

• Store the executed SNDA with the lease, amendments and estoppels.

• Flag its key terms in the lease abstract: the lender's name and notice address, the cure period, any consent needed for amendments, and limits on prepaid rent.

Keeping lease records in the same system as deposits, prepaid rent and lease changes makes it easier to check an SNDA's terms before acting on a lease.

If Foreclosure Happens

If the lender forecloses, attornment means the tenant recognizes the lender or foreclosure buyer as its landlord, and the lease continues under the SNDA's terms. In practice, the new owner sends notice and payment instructions, and tenants pay rent to the new owner. The limits in the SNDA, such as on prepaid rent, amendments and deposits, then decide what the new owner is bound by. Foreclosure procedures and tenant rights vary by state, so specific situations need legal advice.

SNDA vs Estoppel Certificate

SNDA Checklist

• Lender's requirements confirmed: tenants, form, deadline

• Each lease's subordination and SNDA clause reviewed

• SNDAs sent with lease references and deadlines

• Every tenant tracked, including negotiation points

• Signatures collected from tenant, lender and landlord; notarized if required

• Set delivered to the lender before closing

• Recorded where required

• Executed SNDA stored in the lease file

• Key terms flagged in the lease abstract: lender notice details, cure period, amendment consent, prepaid rent limits

Common Mistakes

• Asking for more than the lease requires. The lease clause helps determine what the tenant must sign.

• Signing amendments without checking the SNDA. An amendment made without required lender consent may not bind a future owner.

• Accepting large rent prepayments. Rent paid well ahead may not be credited by a future owner under the SNDA.

• Losing the executed copy. An SNDA that can't be found can't be checked when it matters.

• Not recording lender notice details. Some SNDAs require the tenant to notify the lender of landlord defaults.

Frequently Asked Questions

1. What is an SNDA?
A subordination, non-disturbance and attornment agreement, typically among a tenant, the landlord and the landlord's lender, setting what happens to the lease if the lender forecloses.

2. Why do lenders require SNDAs?
To make the lease rank behind the loan, while confirming the tenant will recognize the lender or foreclosure buyer as landlord and keep paying rent.

3. What does non-disturbance mean?
The lender agrees that, if it forecloses, it won't disturb the tenant's possession as long as the tenant isn't in default and the SNDA's conditions are met.

4. What does attornment mean?
The tenant agrees to recognize the lender or foreclosure buyer as its landlord under the lease.

5. Does a tenant have to sign an SNDA?
It depends on the lease. Many commercial leases require tenants to sign subordination documents on request, sometimes on condition that the lender agrees to non-disturbance.

6. What's the difference between an SNDA and an estoppel certificate?
An estoppel confirms the current facts of a lease. An SNDA sets what happens to the lease if the lender forecloses.

7. Can an SNDA affect lease amendments?
Yes. Some SNDAs say a future owner isn't bound by amendments the lender hasn't consented to in writing, so check the SNDA before signing amendments.

8. Is an SNDA recorded?
Sometimes. Some SNDAs are recorded so the non-disturbance promise binds the lender's successors. Check the agreement and local practice.

Conclusion

An SNDA does more than rank a lease behind a loan. It also limits what a future owner is bound by, and those limits affect how prepaid rent, lease amendments, landlord work and deposits should be handled today. Start with the lease clause, run SNDAs alongside estoppels in a refinance, store the executed copy, and flag its key terms in the lease file.

Note: This article is general information, not legal advice. SNDA terms, lease provisions and foreclosure law vary by agreement and jurisdiction. Consult counsel before negotiating or relying on an SNDA.