Since Washington's statehood in 1889, commercial and residential property laws have maintained distinct legal frameworks. Commercial tenancies are governed by RCW 59.04 (Tenancies) and RCW 59.12 (Forcible Entry and Unlawful Detainer). Because Washington's powerful Residential Landlord-Tenant Act (RCW 59.18) protections (prohibited clauses, mandatory disclosures, non-waivable habitability duties) do not apply to commercial tenancies, the written commercial lease becomes the sole governing law for the relationship. If a provision is not explicitly stated in the lease, a Washington judge will generally not insert one on behalf of either party.

The Triple Net (NNN) Framework

The dominant lease structure in Washington's commercial real estate market is the Triple Net (NNN) Lease, where the tenant bears all "Three Nets":

1. Property Taxes (N1): The tenant's pro-rata share of the building's property tax bill.
2. Insurance (N2): The tenant's share of the building insurance premium, plus their own commercial liability policies.
3. Common Area Maintenance / CAM (N3): The tenant's share of all operational costs for shared areas.

The lease must mathematically define the formula for calculating pro-rata shares (typically based on the tenant's occupied square footage relative to the total leasable square footage).

See our Commercial Maintenance ObligationsPreview unavailable guide.

Essential Commercial Lease Elements

1. The "Permitted Use" Clause

A landlord must tightly control the activity within their building to prevent zoning disputes and conflicts between co-tenants. The lease must detail exactly what the tenant is permitted to do (e.g., "General technology office use exclusively," or "Retail sale of coffee and baked goods only, specifically excluding the preparation of hot foods requiring a Type I commercial ventilation hood").

2. Assignment and Subletting

Many commercial businesses fail or need to relocate. The lease must define whether and how a tenant can transfer the lease to a new business entity.

• Standard Washington commercial leases require the landlord's "Prior Written Consent" for any assignment or sublet.
• In Washington, if a lease requires landlord consent for assignment but is silent on the standard, the landlord may withhold consent for any reason or no reason. The implied covenant of good faith and fair dealing does not create a "reasonableness" requirement in this context (Johnson v. Yousoofian, 84 Wn. App. 755).

3. Alterations and Build-Outs (Trade Fixtures)

The lease must address:

• Whether the tenant can make structural alterations (knocking down walls, installing heavy kitchen equipment).
• Whether the landlord must approve architectural plans in writing before work begins.
• Who owns the improvements ("Trade Fixtures") when the lease expires—and whether the tenant must restore the space to its original "vanilla shell" condition.

4. Personal Guarantees and Security

For smaller businesses leasing under an LLC structure, Washington commercial landlords routinely require the individual business owner to sign a "Personal Guarantee" on the lease.

• For new commercial/retail leases in Seattle (excluding office, medical, and R&D), personal guarantees are capped at the sum of the first two years of base rent plus the total landlord cost of tenant improvements (SMC 6.104.030.B).
• Additionally, for these Seattle leases, security deposits and letters of credit are capped at the combined value of the first and last month's base rent (SMC 6.104.030.A).

5. Notarization and Acknowledgment

Effective June 6, 2024, per SSB 5840, commercial leases of any duration no longer require notarization, witnesses, or seals to be valid and enforceable (RCW 59.04.010). Acknowledgment is only required if the lease or a memorandum of lease is to be recorded with the county (RCW 64.04.010).

How Landager Helps

Managing Washington commercial properties requires precision, especially when tracking complex NNN lease obligations and CAM reconciliations. Landager automates the tracking of lease expiration dates, calculates pro-rata expense shares, and ensures notices are delivered according to the strict timelines defined in your lease agreement. From managing vendor payments to staying compliant with Washington's commercial Unlawful Detainer (RCW 59.12) requirements, Landager helps you navigate the commercial real estate landscape.

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