Massachusetts Commercial Security Deposits: Rules and Best Practices

One of the most important distinctions in Massachusetts property law is that the famously strict security deposit rules of MGL Ch. 186, §15B do NOT apply to commercial leases. The triple damages, interest payments, separate accounts, and Statements of Condition that govern residential deposits are entirely absent from the commercial context.

Disclaimer: This guide provides general legal information for educational purposes only and does not constitute legal advice. Always consult a qualified Massachusetts commercial attorney. Information last verified: March 2026.

No Statutory Rules

Because §15B does not apply, commercial security deposits in Massachusetts are governed entirely by the lease agreement:

• No Cap: There is no statutory limit on the deposit amount. Landlords commonly request 2 to 6 months' rent.
• No Interest: The landlord is not required to pay interest on the deposit.
• No Separate Account: The deposit does not need to be held in a separate, interest-bearing bank account.
• No Statement of Condition: No statutory document is required at move-in.
• No 30-Day Return Deadline: The lease dictates the return timeline.

Common Security Instruments

Cash Deposits

The simplest form, where the tenant hands over cash or a check. The lease should specify whether the deposit earns interest and when it will be returned.

Letters of Credit (LOC)

For larger commercial leases, landlords frequently require an irrevocable standby Letter of Credit from the tenant's bank.

• This is a bank's guarantee to pay the landlord a specified amount if the tenant defaults.
• The landlord can draw on the LOC without needing to prove the tenant's default to the bank (the bank pays immediately and sorts out legality later).
• LOCs are preferred because they survive tenant bankruptcy.

Personal or Corporate Guarantees

A third party (such as a business owner or parent company) personally guarantees the lease obligations, providing additional security beyond the deposit.

Best Practices for Lease Drafting

Because there is no statutory framework, the lease must clearly define:

1. The exact deposit amount and form (cash or LOC).
2. Conditions for drawing on the deposit (e.g., unpaid rent, unpaid CAM charges, damage beyond normal wear and tear).
3. Burndown provisions (allowing the deposit to decrease over time if the tenant maintains a clean payment history).
4. The timeline for return after lease expiration (e.g., 30 or 60 days).
5. Any requirement for the tenant to "top up" the deposit if the landlord makes a permitted deduction during the term.

How Landager Helps

Even without the statutory requirements of §15B, managing commercial security deposits across a portfolio requires precision. Landager tracks LOC expiration dates, monitors burndown schedules, and ensures security instruments are renewed before they lapse, protecting your financial position on every Massachusetts commercial lease.

Back to Massachusetts Commercial Lease Laws Overview.