Quick answer
You negotiate an operating expense cap by limiting how much your controllable expenses can rise each year, defining controllable narrowly, and locking it in at the letter of intent stage while you still have leverage. In practice that means asking for an annual cap of 3 to 5 percent on controllable expenses, insisting the cap be non-cumulative rather than cumulative, and excluding capital items, landlord overhead, leasing costs, and legal fees from the expense pool entirely. In a Denver market where tenants hold real leverage at roughly 27 percent office vacancy on the major brokerages' Q2 2026 read (18.5 percent on the broader all-stock basis), a cap is a reasonable ask that landlords will often grant to close a deal.
The stakes are higher than most tenants realize. Office operating expenses commonly run $8 to $15 per SF, and common area maintenance charges rose an estimated 12 to 18 percent nationally between 2023 and 2026 on higher labor, energy, and insurance costs. Without a cap, those increases pass straight through to you, uncapped, for the life of the lease. On a 20,000 SF lease, the difference between capped and uncapped expense growth can total six figures over a five year term.
The critical distinction is controllable versus uncontrollable. Property taxes, insurance, utilities, and snow removal are typically uncontrollable and sit outside the cap, because the landlord cannot manage the weather or the assessor. Everything else, management fees, janitorial, landscaping, and routine repairs, is controllable and should be capped. Get the definition right, cap the controllable pool at a low single digit rate, and you convert an open ended liability into a predictable line item.
Key takeaways
- Ask for a 3 to 5 percent annual cap on controllable operating expenses, and negotiate it at the letter of intent stage, not after the lease is drafted.
- Insist on a non-cumulative cap; a cumulative cap lets the landlord bank unused increases and blow past your intended ceiling in a high cost year.
- Exclude capital expenditures, landlord overhead, leasing commissions, marketing, and legal fees from the expense pool before you even discuss the cap percentage.
- Denver office operating expenses run roughly $8 to $15 per SF, and CAM rose an estimated 12 to 18 percent nationally from 2023 to 2026, so uncapped exposure is real money.
- Always secure audit rights and a request for three years of expense history so you can verify what you are actually being charged.
Why operating expense caps matter more in 2026
In a full service gross lease, the most common structure for Denver office, your base rent includes a stated amount of operating expenses, and you pay your pro rata share of any increases above that base year. In a triple net lease, you pay operating expenses directly on top of base rent. Either way, the operating expense line is where a lease that looked competitive at signing quietly becomes expensive over its term. The base rate is fixed and visible. The expense escalations are variable and easy to overlook, which is exactly why they deserve attention.
The current cost environment makes this urgent. Insurance premiums, utility costs, and labor for building services have all climbed sharply, driving common area maintenance charges up an estimated 12 to 18 percent nationally between 2023 and 2026. A landlord facing those increases will pass every dollar through to tenants unless the lease says otherwise. A tenant who negotiated a 5 percent cap on controllable expenses is insulated from the worst of it. A tenant who did not is absorbing the full increase, year after year, with no recourse.
The objective a cap protects is cost predictability. A CFO can budget around a base rent and a known escalation. A CFO cannot budget around an operating expense line that might jump 15 percent because the building's insurance renewed badly. The cap turns an unknowable future liability into a bounded one, which is worth real money and real peace of mind.
Controllable versus uncontrollable expenses
The entire negotiation starts with which expenses fall under the cap. This is where the money is won or lost, and it is worth more attention than the cap percentage itself.
| Category | Typically uncontrollable (outside cap) | Typically controllable (inside cap) |
|---|---|---|
| Taxes | Property taxes | |
| Insurance | Building insurance | |
| Utilities | Electricity, gas, water | |
| Weather | Snow removal | |
| Management | Management fees | |
| Cleaning | Janitorial and cleaning | |
| Grounds | Landscaping and common area upkeep | |
| Repairs | Routine repairs and maintenance |
Source: standard commercial lease practice; see American Bar Association and Hollander Real Estate Law guidance on operating expense clauses. Categorization varies by lease, so confirm your specific definitions.
The landlord's opening position is usually to make the uncontrollable bucket as large as possible, since those expenses escape the cap. Your position is the reverse. Push to keep the controllable pool broad, and scrutinize any attempt to classify a normally controllable cost, like management fees or service contracts, as uncontrollable. A generous uncontrollable definition can render the cap nearly meaningless.
Cumulative versus non-cumulative: the cap mechanic that matters most
Two caps with the same 5 percent number can produce very different bills depending on one word in the lease.
| Cap type | How it works | Who it favors |
|---|---|---|
| Non-cumulative | Each year's controllable expenses cannot exceed 105 percent of the prior year's permitted amount. Unused headroom is lost. | Tenant |
| Cumulative | The 5 percent ceiling compounds off the base regardless of actual spend, and the landlord can recover unused increases from prior years in a later year. | Landlord |
Source: Lowndes and Law Insider guidance on cumulative versus non-cumulative CAM caps.
The difference shows up in a spike year. Suppose your controllable expenses hold flat for two years, then insurance and labor drive a 15 percent jump in year three. Under a non-cumulative cap, the landlord can still only pass through 5 percent that year, and absorbs the rest. Under a cumulative cap, the landlord can reach back to the unused 5 percent from years one and two and stack it, passing through far more than 5 percent in the spike year. That is precisely the year you most needed protection. Always negotiate for non-cumulative, and read the definition carefully, because landlords often draft cumulative as the default.
What the cap is worth in dollars
Consider a 20,000 SF office tenant with controllable operating expenses starting at $10 per SF, on a five year term, in a market where costs are rising about 8 percent a year.
- Uncapped, at 8 percent annual growth, controllable expenses climb from $200,000 in year one to roughly $272,000 by year five.
- With a 5 percent non-cumulative cap, year five controllable expenses are held to about $243,000.
- The year five difference alone is roughly $29,000, and the cumulative savings across the full term approach $75,000 on the controllable pool.
That is the value of a single clause, negotiated in a few sentences of the lease, on a mid size deal. Scale it to a larger footprint or a longer term and the cap becomes one of the most valuable concessions in the entire lease.
What this means for your negotiation
Raise the cap early. A cap requested at the letter of intent stage is routine and frequently granted, especially in a soft market. The same request made after the lease is drafted reads as a renegotiation and draws resistance. In Denver's current tenant favorable conditions, a cap belongs on your term sheet alongside free rent and tenant improvement dollars, not as an afterthought.
Then negotiate the surrounding terms, because the cap percentage is only as good as the pool it applies to and your ability to verify the charges. Insist on excluding capital expenditures, the landlord's corporate overhead, leasing commissions, marketing, and legal fees from operating expenses entirely. Require a gross up provision that is fair in both directions so you are not overcharged when the building is partly vacant. And secure audit rights plus the last three years of expense history, so you can check the landlord's math. The cap prevents overcharges going forward; audit rights and history let you catch the ones already happening, which is the natural complement to a lease audit of your operating expenses. If you are still deciding between lease structures, understand how expenses flow in each by reviewing full service gross versus NNN.
Brian's perspective
The operating expense cap is the most undernegotiated term in Denver office leases, and it is not close. Tenants and their teams pour energy into the base rate, the free rent, and the improvement allowance, all of which are visible and easy to compare across proposals, and then accept the landlord's standard expense language with barely a redline. Two years later they are surprised by a reconciliation bill that erodes the deal they thought they signed.
On the leases we run, the expense pool gets as much scrutiny as the base rent, because over a full term it can move the total occupancy cost just as much. The pattern that works is to fight the definition fight first, narrowing what counts as controllable and stripping out capital and overhead items, and only then argue the percentage. A 5 percent cap on a bloated expense pool that includes the landlord's capital projects is worse than a 6 percent cap on a clean pool that excludes them. In this market, with vacancy near cycle highs and landlords motivated to close, we are getting both the clean pool and the low cap on mid size deals more often than not.
The counterargument a landlord will make, and it is not entirely wrong, is that a hard cap can leave them underwater in a genuine cost spike, which is why they prefer cumulative structures or larger uncontrollable buckets. The fair resolution is not to abandon the cap, it is to keep the truly uncontrollable items, taxes, insurance, utilities, outside it while capping everything the landlord actually manages. That protects the landlord from what they cannot control and protects you from what they can, which is the entire point.
Risks to consider
- A cumulative cap disguised as protection. A 5 percent cumulative cap can pass through far more than 5 percent in a spike year. Insist on non-cumulative and confirm the definition in writing.
- An inflated uncontrollable bucket. If the landlord classifies management fees or service contracts as uncontrollable, the cap protects almost nothing. Fight the definition before the percentage.
- Capital expenditures hidden in operating expenses. Without an explicit exclusion, you can be charged your share of the landlord's roof, HVAC, or parking capital projects. Exclude them expressly.
- No audit rights. A cap you cannot verify is a cap you cannot enforce. Require audit rights and three years of expense history.
- Raising it too late. A cap requested after the lease is drafted invites resistance. Put it on the letter of intent while your leverage is highest.
Bottom line
An operating expense cap converts an open ended liability into a predictable cost, and in Denver's tenant favorable 2026 market it is a reasonable and winnable ask. Target a 3 to 5 percent non-cumulative cap on a controllable expense pool that excludes capital items and landlord overhead, keep the truly uncontrollable costs outside it, and back it with audit rights and expense history. Raise it at the letter of intent, negotiate the definition before the percentage, and you protect six figures of occupancy cost over a typical term with a few well drafted sentences.
Frequently asked questions
What is a reasonable operating expense cap on a Denver office lease?
A 3 to 5 percent annual cap on controllable operating expenses is a reasonable target, and it should be non-cumulative. Landlords in Denver's current tenant favorable market, with office vacancy near cycle highs at roughly 27 percent (major brokerage reports, Q2 2026), will often grant a cap to close a deal. The cap should apply only to controllable expenses, with taxes, insurance, and utilities typically remaining outside it.
What is the difference between controllable and uncontrollable operating expenses?
Uncontrollable expenses are those the landlord cannot manage, typically property taxes, building insurance, utilities, and snow removal, and they usually sit outside the cap. Controllable expenses include management fees, janitorial, landscaping, and routine repairs, and these should fall under the cap. Watch for landlords trying to classify normally controllable costs as uncontrollable to weaken the cap.
Should my operating expense cap be cumulative or non-cumulative?
Non-cumulative, which favors the tenant. A non-cumulative cap limits each year's controllable expenses to a set percentage over the prior year and does not let the landlord carry forward unused increases. A cumulative cap allows the landlord to bank unused headroom and pass through more than the cap percentage in a high cost year, exactly when you most need protection.
When should I negotiate the operating expense cap?
At the letter of intent or term sheet stage, while you have the most leverage. A cap requested early is routine and frequently granted, especially in a soft market. Requesting it after the lease is drafted reads as a renegotiation and draws resistance, so put it on the term sheet alongside your other economic asks.
If you're working through a lease decision in Denver, whether that's a renewal, a relocation, or a footprint question your CFO is pushing on, I'm happy to run the numbers with you. Schedule a conversation at brianmccririe.com/meet-with-brian-mccririe.
About Brian McCririe
Brian McCririe is Executive Managing Director of SVN | Denver Commercial and National Council Chair for Occupier Services across the SVN network. After 25 years representing tenants and investors across global markets, he now focuses on the Denver Metro area helping companies navigate leases, acquisitions, and the gap between what landlords offer and what occupiers deserve. He leads one of the metro's top tenant rep practices and writes about the deals, decisions, and market shifts that matter to corporate real estate leaders.
