Washington State Commercial Security Deposit Laws

Disclaimer: This guide provides general legal information for educational purposes only and does not constitute legal advice. Always consult a licensed commercial real estate attorney in Washington state for advice specific to your situation. Information last verified: March 2026.

Washington's residential deposit rules under the RLTA (RCW 59.18) are highly prescriptive—mandatory trust accounts, a 21-day return window, and the forfeiture of deduction rights without a move-in checklist. None of these protections apply to commercial tenancies.

Commercial security deposits in Washington are governed entirely by the terms negotiated in the commercial lease agreement and basic contract law. The state places no statutory guardrails on the landlord.

1. No Statutory Deposit Caps

A Washington commercial landlord can demand a security deposit of any amount they deem appropriate.

• Requesting one to three months' base rent is the industry standard.
• For high-risk tenants (e.g., unproven startups or restaurants with historically high failure rates), demanding six to twelve months' rent is common and perfectly legal.

2. No Trust Account Requirement

• The RLTA's mandatory trust account rule does not extend to commercial leases.
• A commercial landlord can legally commingle the tenant's deposit with their general operating funds unless the lease specifically requires segregated escrow.
• There is no statutory requirement to pay the tenant interest on the deposit.

3. Return Deadlines and Deductions

• The RLTA's rigid 21-day return window does not apply.
• The deposit return timeline is dictated by the commercial lease. Standard contracts often grant the landlord 30 to 60 days after the tenant vacates to inspect, reconcile outstanding CAM charges, assess dilapidations, and return the remaining balance.
• Deductions can be far broader than residential, potentially including: unpaid base rent, unpaid NNN charges, default interest, CAM reconciliation shortfalls, and the cost of restoring the premises to a "vanilla shell" condition.

4. The Move-In Checklist (Not Required, But Critical)

While a commercial landlord is not statutorily required to provide a move-in checklist (unlike residentials), it is an extremely important best practice. Without documented baseline evidence of the property's condition, the landlord will struggle to successfully deduct funds for tenant-caused damages if a dispute arises.

How Landager Helps Commercial Landlords in Washington

Managing a large commercial deposit collected from a new Washington tenant—especially when commingling is legally permitted—demands rigorous internal accounting to prevent audit failures. Landager securely logs commercial deposits as protected liabilities on your balance sheet, entirely separate from operating revenue. When the 10-year lease concludes, the system enforces your custom 60-day return window, automatically compiling unpaid NNN reconciliation shortfalls, accumulated default interest, and itemized dilapidation costs into a single, auditable final disbursement statement.

Back to Washington Commercial Landlord-Tenant Laws Overview.