California Commercial Lease Requirements: SB 1103, NNN Terms
Discover California commercial lease requirements including SB 1103 QCT provisions, NNN structures, security deposit rules, and mandatory disclosures.
Legal Disclaimer
This content is for general informational and educational purposes only. It does not constitute legal advice and should not be relied upon as such. Laws change frequently — always verify current regulations and consult a licensed attorney in your jurisdiction for advice specific to your situation. Landager is a property management platform, not a law firm.Information last verified: May 2026.
California commercial leases are primarily governed by the California Civil Code (originally enacted March 21, 1872, effective January 1, 1873). While the law treats commercial tenants as sophisticated parties with broad freedom of contract, the Commercial Tenant Protection Act (SB 1103), effective January 1, 2025, has introduced specific protections for "Qualified Commercial Tenants." General lease requirements remain governed by the California Civil Code and contract law principles.
Commercial Lease Fundamentals (Civil Code)
Official Law Citation: General commercial lease structures, including the Statute of Frauds and basic contractual obligations, are governed by the California Civil Code Division 3, Part 4, Title 5, Chapter 2.
Written vs. Oral Leases
California requires any lease for a term longer than one year to be in writing to be enforceable (Civil Code § 1624). While periodic or month-to-month tenancies can technically be oral, written agreements are standard to ensure all disclosures and terms are legally binding.
Essential Lease Components
Commercial leases must clearly define the following elements to be enforceable and practical:
- Parties and Premises: Full legal names and entity types, with a precise description of the space and common area rights.
- Rent and Escalations: Base rent, lease type (Gross, NNN, etc.), and clear mechanisms for annual increases or index-based escalations.
- Security Deposits: Governed by Civil Code § 1950.7. If the landlord's claim is only for defaults in the payment of rent and the security deposit exceeds one month’s rent, the portion in excess of one month’s rent must be returned within 14 days, with the remainder returned within 30 days. If the claim includes amounts for repairs or cleaning, the remaining portion must be returned no later than 30 days from the date the landlord receives possession.
- Maintenance Allocation: Unlike residential law, there is no implied warranty of habitability; the lease must explicitly state who is responsible for structural vs. non-structural repairs.
- Assignment and Subletting: Consent requirements and "recapture" rights that allow a landlord to terminate if a tenant seeks to transfer the lease.
SB 1103: The Commercial Tenant Protection Act
Effective January 1, 2025, SB 1103 provides enhanced transparency and notice requirements for Qualified Commercial Tenants (QCT). Under Civil Code § 1950.9(a), a QCT is defined as:
- A microenterprise with 5 or fewer employees (per Gov. Code § 13997.2).
- A restaurant with fewer than 10 employees.
- A nonprofit organization with fewer than 20 employees.
The tenant must provide a written self-attestation of this status to the landlord to receive these protections.
Rent Increase Notice Periods
For Qualified Commercial Tenants, landlords must provide extended notice for rent adjustments (Civil Code § 827):
- 30 Days' Notice: For rent increases of 10% or less.
- 90 Days' Notice: For rent increases of more than 10%.
Enhanced Termination Notice
Landlords must provide at least 60 days' notice to terminate the lease of a Qualified Commercial Tenant, regardless of conflicting terms in the lease agreement (Civil Code § 1946.1).
Operating Cost Transparency
Effective January 1, 2025, a landlord shall not charge a QCT for building operating costs unless the costs are proportionately allocated per tenant and documented. Landlords must provide an itemized list of costs and supporting documentation upon the tenant's request, and must notify the tenant of their right to inspect such documentation before lease execution (Civil Code § 1950.9).
California-Specific Considerations
Prop 65 and ADA Compliance
Leases must clearly allocate responsibility for Proposition 65 warnings regarding chemical exposures (Health & Safety Code § 25249.6) and ADA compliance. Under California law (Civil Code § 1938), landlords must disclose whether the premises have been inspected by a Certified Access Specialist (CASp) and provide the report if one exists.
Earthquake and Seismic Retrofit
Given the regional risk, leases often address:
- Responsibility for seismic retrofit costs (especially in older unreinforced masonry buildings).
- Reconstruction obligations following a casualty event.
- Business interruption insurance requirements.
Sources & Official References
Frequently Asked Questions
▶What are the California landlord-tenant laws every property owner should know?
California landlord-tenant law is governed primarily by Civil Code §1940–1954.06 and the Tenant Protection Act (AB 1482). Key requirements include a one-month security deposit limit (effective July 2024), statewide rent caps of 5% + CPI or 10% (whichever is lower), just-cause eviction protections for tenancies over 12 months, mandatory habitability standards, and extensive disclosure requirements. Non-compliance can result in statutory penalties and punitive damages.
Read the complete guide▶What is the California eviction process and how long does it take?
California distinguishes between at-fault and no-fault evictions. For unpaid rent, landlords serve a 3-Day Notice to Pay or Quit. For lease violations, a 3-Day Notice to Cure or Quit is required. No-fault evictions require 30 days notice for tenancies under one year, or 60 days for longer tenancies, plus relocation assistance equal to one month's rent under AB 1482. After notice expires, an Unlawful Detainer lawsuit is filed, and the full court process typically takes 5-8 weeks.
Read the complete guide▶What is the California security deposit limit in 2026?
As of July 1, 2024, California limits security deposits to one month's rent for all residential properties, regardless of whether the unit is furnished or unfurnished — eliminating the previous two-month limit. Landlords must return the deposit within 21 days of move-out with an itemized statement of deductions. Allowable deductions include unpaid rent, cleaning beyond normal wear and tear, and repair of tenant-caused damage.
Read the complete guide▶What are the California rent increase laws and caps for landlords?
Under AB 1482 (the Tenant Protection Act), most California residential properties are subject to annual rent caps of 5% plus the local Consumer Price Index (CPI), or 10%, whichever is lower. Landlords must provide 30 days written notice for increases of 10% or less, and 90 days for increases above 10%. Exemptions include properties built within the last 15 years, certain single-family homes, and owner-occupied duplexes.
Read the complete guide▶What is the grace period for late rent in California?
California does not mandate a statutory grace period for late rent — technically, rent is late the day after it is due. However, most leases include a 3-5 day contractual grace period. Late fees must be reasonable and reflect the landlord's actual costs from the delay. A 3-Day Notice to Pay or Quit cannot be served until rent is actually past due, and courts may reject excessive late fee provisions as unenforceable penalties.
Read the complete guide▶What disclosures must California landlords provide to tenants?
California requires extensive pre-lease disclosures including: lead-based paint warnings (pre-1978 buildings), Megan's Law sex offender database notice, bed bug history, mold hazards, proximity to former military ordnance locations, flood zone status, and any known environmental hazards. Landlords must also disclose the property's demolition or renovation history and provide contact information for the property owner or authorized agent.
Read the complete guide▶What are the California lease requirements for rental properties?
While oral leases are technically valid for terms under one year, California strongly favors written agreements. Required lease elements include rent amount and due date, security deposit terms, maintenance responsibilities, and rules regarding pets, smoking, and subletting. Lease terms must comply with AB 1482 just-cause eviction protections, and any waiver of tenant rights in the lease is void and unenforceable.
Read the complete guide▶What are California landlord maintenance obligations and habitability standards?
Under California's implied warranty of habitability, landlords must maintain properties in fit and livable condition. This includes working plumbing, heating, electrical systems, weatherproofing, clean common areas, functioning locks and windows, and pest control. If a landlord fails to make necessary repairs within 30 days of written notice, tenants may use the 'repair and deduct' remedy (up to one month's rent) or withhold rent entirely until conditions are corrected.
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