A subordination, non-disturbance, and attornment agreement (SNDA) for use in Massachusetts. An SNDA establishes the rights and priorities between a lender's mortgage lien and a tenant's leasehold interest in mortgaged commercial property. This Standard Document discusses SNDAs from a lender's perspective, including matters such as lien subordination, attornment, landlord defaults, lease amendments, mortgagee protection provisions, and the effect of Massachusetts law on the enforceability and construction of SNDAs. This Standard Document has integrated notes and important explanations and drafting and negotiating tips for lenders and tenants.