If you own or manage commercial property in San Diego County, the ground just shifted beneath your feet. While much of the legal buzz in California lately has focused on residential renters, a powerful new law: Senate Bill 1103 (SB 1103): is quietly changing the game for commercial landlords.
As we move through 2026, many landlords are hitting a major roadblock: Common Area Maintenance (CAM) reconciliations. If you are used to sending out a simple, one-page summary of "estimated expenses" and collecting a check, those days are officially over. Under SB 1103, failing to provide specific, itemized documentation can not only prevent you from collecting fees but can also stop an eviction case dead in its tracks.
As a commercial eviction lawyer and eviction attorney San Diego property owners can turn to, Andrew Griffin also holds a California real estate broker’s license, so you benefit from both legal and real estate insight. You need to understand how these "hidden" rules work before a tenant uses them against you.
Do Your Tenants Qualify for These Protections?
Not every commercial tenant in El Cajon or San Diego is covered by SB 1103. The law specifically protects what it calls "Qualified Commercial Tenants" (QCTs).
Generally, a QCT is a small business or a nonprofit organization that meets specific size and revenue thresholds. This includes many of the "mom-and-pop" shops, local micro-enterprises, and community nonprofits that make up the backbone of the San Diego economy. If your tenant is a massive national franchise or a global corporation, these specific CAM rules might not apply. However, for the majority of local retail strips and office parks, you are likely dealing with at least one QCT.
Before you sign a new lease or process a renewal, you must determine if the tenant has provided a "QCT Attestation." If they have, or if the lease was signed or renewed after January 1, 2025, you are now operating under a much stricter set of rules.

The Documentation Mandate: No More "Miscellaneous" Fees
The days of "rounding up" or using vague "building operating cost" categories are gone. SB 1103 mandates that landlords cannot charge or collect CAM or operating fees from a QCT unless they provide itemized, primary-source documentation.
What does "primary-source" mean for you? It means you can’t just show the tenant your own internal ledger. You must be prepared to show:
- Actual invoices from contractors (landscapers, HVAC techs, janitorial services).
- Receipts for materials.
- Signed contracts for recurring services.
- A signed attestation from the landlord (you) stating that these costs are true, accurate, and actually incurred.
If you cannot produce these documents, you cannot legally collect the money. Many landlords are finding that their accounting systems aren't quite ready for this level of transparency, which is why we recommend auditing your own books before a dispute arises.
The 30-Day Ticking Clock
One of the most dangerous parts of SB 1103 is the strict timeline for responding to tenant inquiries. If a Qualified Commercial Tenant makes a written request for documentation regarding building operating costs, the clock starts immediately.
You have exactly 30 days to provide the supporting documentation.
If you miss this window, the consequences are severe. Not only is the tenant potentially excused from paying those specific fees until you comply, but you may also be opening yourself up to a lawsuit for damages. In an era where 30 days can fly by in the blink of an eye, having your documentation organized and ready to go is no longer a luxury: it’s a legal necessity.

The Ultimate Trap: The Affirmative Defense in Eviction
As a commercial eviction lawyer, I have to warn you about the biggest "teeth" in this law. SB 1103 allows a tenant to use a landlord’s failure to comply with CAM disclosure rules as an affirmative defense in an Unlawful Detainer (eviction) case.
Imagine this scenario: Your tenant stops paying rent and CAM fees. You serve a notice to pay or quit and eventually file for eviction. In court, the tenant’s attorney points out that you never provided the itemized documentation they requested 45 days ago.
Under SB 1103, the court could rule that your eviction notice was defective because it included fees you weren't legally allowed to collect yet. Your case could be dismissed, and you might even be ordered to pay the tenant's legal fees. This is why it is critical to work with an eviction attorney San Diego landlords can trust who understands the nuances of these 2026 regulations. We help landlords ensure their commercial evictions are handled correctly from the very first notice.
Proportional Allocation and the 18-Month Rule
SB 1103 also takes aim at how fees are calculated. You are now required to use a "proportional allocation" method. In most cases, this means fees must be based on square footage. If you want to use a different method, you must be able to substantiate it with clear documentation.
Furthermore, there is a new "look-back" and "look-forward" limit:
- The 18-Month Look-Back: You can only charge for operating costs that were incurred within the previous 18 months. You can no longer wait three years to do a "deep audit" and hit a tenant with a massive bill for old expenses.
- The 12-Month Look-Forward: You can only charge for reasonably expected costs for the next 12 months based on actual estimates.
Notes for Business Owners
If you operate your rental properties as a business entity (LLC or Corporation), ensure your property management agreements are updated to reflect SB 1103 compliance. Your property manager’s failure to provide documentation within the 30-day window is your legal liability. Make sure your team is prepared to pull primary-source invoices at a moment’s notice to protect your right to collect rent and CAM.

Why a Broker-Attorney is Your Best Defense
Navigating the intersection of real estate math and California law is complicated. Most lawyers understand the statutes, and most brokers understand the market and the "books." At the Law Office of Andrew H. Griffin, III, APC, we bring both perspectives to the table.
Because Andrew Griffin is both a licensed attorney and a California real estate broker, our firm offers the kind of insight you would expect from a Broker-Attorney real estate lawyer San Diego property owners may need when lease disputes and CAM documentation overlap. We don't just tell you what the law says; we understand how the spreadsheets work and how to organize your documentation so that it stands up in a San Diego County court.
Whether you are facing a tenant who refuses to pay or you simply want to make sure your 2026 reconciliations are bulletproof, we are here to help. Don't wait until you are sitting in a deposition or an eviction hearing to realize your documentation is lacking.
If you have questions about a specific tenant or need help drafting a compliant CAM notice, reach out to an experienced commercial eviction lawyer and eviction attorney San Diego property owners can rely on today.
Contact the Law Office of Andrew H. Griffin, III, APC:
- Phone: 619 853-3009
- Online: Contact Us Here























