This clause defines the property costs you reimburse on top of base rent, typically property taxes, insurance, common area maintenance and any business park association dues. It sets your percentage share, how monthly estimates are billed, how the owner reconciles actual costs each year, and whether you can audit the numbers.
What this clause does
In most industrial leases, base rent is one part of the monthly bill. Operating expenses, often called OpEx, NNN charges or CAM, cover the cost of owning and running the property: property taxes, the owner's insurance, and maintenance of shared areas such as drive aisles, truck courts, landscaping, lighting and storm drains. In a business park governed by covenants, conditions and restrictions, the park association's dues are usually passed through as well.
Justin's tenant book makes the point that the lease type label (gross, modified gross, triple net) sets expectations. The specific language decides who pays for what. The owner estimates the year's costs, bills you a monthly share based on your percentage of the building or park, then reconciles against actual costs after year end and sends a refund or, more often, a bill.
What belongs in and what should stay out
Reasonable pass-throughs include taxes, insurance, landscaping, parking lot sweeping, exterior lighting, fire sprinkler monitoring and a property management fee. The definitions to read carefully are the ones covering capital items. Replacing a roof, resurfacing a truck court or upgrading a fire system benefits the building for decades. If those costs are passed through, ask that they be spread over their useful life rather than billed in a single year.
Ask for exclusions as well: costs to fix original construction defects, the owner's financing and leasing costs, legal fees for disputes with other tenants, penalties caused by the owner's late payments, and renovations a new owner undertakes for its own purposes. Justin has seen new owners inadvertently pass renovation costs through as operating expenses, and a line-by-line review is what caught it.
Reconciliations and audit rights
Executives are often surprised when a reconciliation arrives asking for a check to cover last year's increases. These bills are normal, but they deserve review. Chart the last several years by category and look for jumps. Ask your broker what comparable buildings pay. Before you sign a new lease, ask for three years of operating expense history so you can see the trend.
Most leases grant some right to review the owner's records, sometimes limited in who may do the review and how long after the statement you have to object. Know that deadline. Justin also notes the flip side: an audit can uncover under-billing as well as over-billing, so weigh whether a discrepancy is worth pursuing before you start.
Keep the reconciliation file organized year to year. When you later negotiate a renewal or an expansion, the history of what you actually paid is useful evidence, and it helps your broker compare your gross occupancy cost with alternatives in the market.
What to negotiate
Ask for a cap on annual increases in controllable expenses, the costs the owner can manage, leaving taxes, insurance and utilities outside the cap. Ask for a clear exclusions list, useful-life treatment of capital items, a cap on the management fee and a defined audit right with a reasonable window. If you are the sole tenant in the building, consider whether you would rather self-perform landscaping or sweeping to control cost. If your lease includes free rent, settle whether operating expenses are also abated during those months. Have a real estate attorney review the definitions, since that is where the money is.
Business parks versus single-tenant buildings
In a multi-tenant business park, the owner usually maintains the exterior and common areas and divides the cost among tenants by their share of the park. Ask how that share is calculated, whether costs are allocated among several buildings, and whether expenses that vary with occupancy are adjusted as if the park were fully leased. Owners pool park costs to keep the property looking consistent, which is reasonable, but the allocation should be clear.
In a single-tenant building there is more room to shape the arrangement. Some owners handle the roof, parking lot and landscaping and bill you. Others hand you the whole property. Many institutional owners service the HVAC units themselves and bill a quarterly charge. Whatever the split, expect to handle interior maintenance, utilities and janitorial on your own. Clarify which items the owner will manage and pass through, and which you will contract directly, before you sign.
If you are the tenant
- Request three years of operating expense history and the current budget before you sign.
- Ask for a cap on controllable expense increases and a written exclusions list.
- Require capital replacements to be spread over their useful life rather than billed in one year.
- Confirm your share percentage and the square footage it is based on.
- Calendar the deadline to dispute each annual reconciliation.
If you are the owner
- Reconcile every year; skipping the true-up leaves recoverable costs on the table.
- Keep clean records by property so pooled portfolio costs are allocated accurately.
- Separate capital projects from operating costs in your billing to avoid disputes and refunds.
- Share the expense breakdown and trend with your leasing broker so asking rents reflect the real gross cost.
Go deeper in Justin's books
Both books walk through leases chapter by chapter, from the tenant side and the owner side.
Sophisticated tenants and brokers ask for a breakdown of the operating expenses on an annual basis to ensure they are reasonable.
Common questions
What is CAM in an industrial lease?
Common area maintenance: the cost of maintaining shared parts of the property such as drive aisles, landscaping, lighting and parking. It is usually billed with property taxes and insurance as part of your operating expenses.
What are association fees on a warehouse lease?
In business parks with an owners' association, the association charges dues for shared park costs like entry landscaping, private roads and park signage. Most leases pass those dues through to tenants as an operating expense.
Can I audit my landlord's operating expense charges?
Many leases include audit rights, often with limits on who can review the records and a deadline to object. If your lease is silent, raise it with the owner, and remember that an audit can also find under-billing.
General information about how industrial leases commonly work, not legal advice. Every lease is different: have a California real estate attorney review yours before you sign.