Negotiating a base year lease can be one of the most important and often overlooked parts of a commercial lease. Whether you are signing a new lease or renewing, understanding how to structure base year operating expenses can save your business significant money over time.
If you are unfamiliar with what a “base year” is, start here.
Here are several tips to help tenants negotiate smarter and avoid unnecessary costs.
1. Understand the Base Year Operating Expenses
Start by reviewing which expenses are included in the base year. Expenses vary by building, so read the lease carefully and request an operating expense budget from the landlord before signing.
Expenses typically include:
- Property maintenance
- Taxes and insurance
- Management fees
- Janitorial and security
Understanding the base year building expenses is crucial because it sets the foundation for future expense calculations. Knowing what is in and what is out helps avoid surprises.
2. Negotiate Which Year to use as the Base Year
The base year typically refers to the calendar year the lease begins. However, if your lease starts in the second half of the year, negotiate for the following year as your base year.
Doing this offers two key advantages:
- Delays expense payments. If your lease starts in November 2025 and the base year is 2026, you will not pay OpEx until January 2027.
- Increases the baseline. Since operating costs usually rise, starting with a future base year lowers your pass-through expenses long term.
This approach can delay payments by 12+ months and reduce what you owe for the remainder of the lease.
3. Add a Cap on Increases
You can and should negotiate a cap on annual increases in operating expenses beyond the base year.
Most landlords are open to caps on controllable expenses, such as:
- Maintenance
- Landscaping
- Management fees
Fewer are open to caps on uncontrollable expenses such as taxes or utilities.
We suggest asking for a 4% non-cumulative cap. If that’s not possible, many landlords will accept a 4–8% cumulative cap on controllable items.
If the landlord refuses to discuss caps at all, it could indicate they aren’t actively managing costs — a red flag.
4. Handling Expenses added Post-Base Year
Buildings change. New owners, management companies, or services can all increase expenses. To protect yourself, negotiate a clause requiring new expense categories to be added retroactively to the base year.
Here is an example:
If earthquake insurance did not exist in your base year but is later added at $1.20/SF, the lease should adjust the base year upward by the same $1.20/SF. Otherwise, you will absorb 100% of the cost increase.
This clause also helps cover:
- New janitorial & maintenance contracts
- Enhanced security
- Utility cost restructuring
5. Limit Capital Repairs and Improvements
Capital improvements like a new lobby, roof, or HVAC aren’t part of everyday maintenance. Capital improvements should not be passed through unless:
- They are legally required after the lease is signed
- They result in measurable cost savings, such as improved energy efficiency
Avoid paying for aesthetic upgrades or building amenities you did not request or benefit from.
6. Get Expert Help
Leases are complex. Operating expense sections are even more so.
Bring in a commercial real estate broker or real estate attorney before you sign. They know how to spot vague language, uncover risk, and negotiate favorable terms.
This step alone can save you from years of overpayments or disputes.
7. Audit Your Lease Annually
After signing, stay proactive. Review your OpEx budgets and reconciliations each year to make sure they align with your lease.
At National Lease Advisors, we’ve helped tenants recover over $1,000,000 annually through detailed lease audits. Mistakes happen but without review, they go unnoticed.
Final Takeaway
Negotiating a base year lease is not just about the rent, it is about managing long-term risk and cost. By understanding the mechanics of base year calculations, setting caps, addressing exclusions, and getting the right help, tenants can protect their business from unnecessary operating expense exposure.
Want a second set of eyes on your lease? Talk to National Lease Advisors — we help companies across industries save money, stay compliant, and take control of their lease terms.