This is a critical area where the residential and commercial worlds diverge completely in Washington state.

• Residential: The RLTA mandates a 5-day grace period before late fees can accrue, and cities like Seattle cap fees at a mere $10. Landlords cannot evict solely for unpaid late fees, and late fees cannot be included on a 14-Day Pay or Vacate notice.
• Commercial: None of these protections apply. The commercial lease is the sole authority.

1. No Statutory Grace Period

There is no Washington statute granting commercial tenants a grace period for rent payments.

If a commercial lease states rent is due "on the 1st of the month" and contains no written grace period, the tenant is legally in default if the funds have not cleared by midnight on the 1st.

While most well-drafted commercial leases include a negotiated grace period (e.g., "rent is due on the 1st, but no default interest will apply if paid by the 5th"), this is entirely a contractual courtesy, not a statutory right.

2. No Statutory Late Fee Cap

Unlike the rapidly tightening residential caps (1.5% statewide, or $10 in Seattle), Washington law imposes no cap on commercial late fees. The fee structure negotiated in the lease is entirely enforceable, provided it does not constitute an unconscionable "penalty" under general contract law.

Standard commercial late fee structures include:

The Flat Administration Charge

A fixed dollar amount or percentage triggered when the grace period expires.

• A flat fee of $100 to $500, or a straight 5% of the outstanding monthly balance, is standard and defensible.

Default Interest (Per Diem Penalty)

The heavier mechanism. A standard clause dictates that once rent is delinquent, "Default Interest" begins accruing daily on the outstanding balance.

• Commercial leases typically set this at a firm 12% to 18% annual rate, or a formula like "4% above the Prime Rate."
• While not capped, a patently usurious rate (e.g., 40% annualized) may be struck down by a Washington court as an unconscionable penalty.

3. Late Fees CAN Be Included in Eviction Demands

Another critical difference: unlike residential evictions where late fees must be excluded from the 14-Day Pay or Vacate notice, a commercial landlord can include all outstanding balances—base rent, late fees, default interest, and NNN arrears—in their eviction demand letter. This makes commercial eviction notices significantly more aggressive.

See our Commercial Eviction ProcessPreview unavailable guide.

How Landager Helps

Managing Washington properties requires precision, especially with Seattle's strict security deposit caps and the statewide 30-day return deadline. Landager automates the mandatory move-in checklist process, tracks the 14-day "pay or vacate" notices, and ensures rent increases are delivered with the required 90-day notice. From managing installment payment requests to staying compliant with Just Cause eviction requirements, Landager helps you navigate the complex RCW 59.18 landscape.

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