What should you check on an office operating expense reconciliation?

Check five things in the first 30 minutes: year-over-year jumps in individual line items, the gross-up math (especially in a high-vacancy building), cap compliance on controllable expenses, capital projects recharacterized as operating expenses, and the management fee percentage against the base it's calculated on. Then read your lease's audit clause. Most Denver office leases give you 60 to 180 days from delivery of the statement to dispute it in writing. Miss that window and the overcharges lock in... permanently.

Every spring, the annual operating expense reconciliation lands in your inbox. If your lease has a base year or an expense stop, this is the landlord's true-up: what you paid in monthly estimates last year versus what the building actually spent, with an invoice (or occasionally a credit) for the difference.

Most tenants treat it like a utility bill. It gets forwarded to accounts payable, coded, and paid. Nobody reads the line items. Nobody checks the math.

Here's the problem. The reconciliation isn't just an invoice. It's a legal document with a fuse attached. Buried in the operating expense section of your lease is an audit clause, and in the typical Denver office lease it says something like this: the tenant has a fixed number of days after receiving the statement to object in writing or request a review, and after that, the statement is deemed final and binding.

Sixty days in aggressive leases. Ninety to 120 in most. One hundred eighty if your attorney was paying attention at signing.

That deadline is running while the statement sits unread in an AP queue. This post is about that deadline: what the statement actually is, what to check before the window closes, and what to do if it's closing on you right now.

The reconciliation is a true-up, and its errors compound

Quick mechanics, because the structure is what creates the risk.

Under a full service gross or base year lease, you pay base rent plus your share of operating expense increases over a base amount. The landlord can't know the year's actual expenses in advance, so you pay monthly estimates. Then, a few months after year-end, the landlord reconciles: actual expenses, minus the base, times your pro rata share, minus what you already paid in estimates. The difference is your true-up bill. If the structure of your own lease is fuzzy, start with what Denver office tenants actually pay under full service gross versus NNN, because the reconciliation only bites leases with expense pass-throughs.

Two features make this statement more dangerous than a normal invoice.

First, the deadline. Your right to challenge the numbers expires on a date set by your lease, whether or not anyone at your company ever read the statement. Silence counts as acceptance.

Second, the compounding. This year's actuals become the baseline for next year's monthly estimates. An overcharge you pay without objection doesn't cost you once. It gets built into next year's billing, and often into the trajectory of every year after that. On a 20,000 SF lease, a $0.50/SF error that locks in isn't a $10,000 mistake. It's $10,000 a year for the rest of the term.

Five things to check in the first 30 minutes

You don't need a forensic accountant on day one. You need 30 minutes, last year's statement, and the operating expense definition from your lease. Here's the pass I run:

1. Year-over-year line-item jumps. Put this year's statement next to last year's, line by line. Flag anything that jumped double digits without an obvious explanation. Insurance, security, and repairs and maintenance are the usual suspects. A single line item moving 20% while the building didn't change is a question, not a payment.

2. The gross-up math. A gross-up provision adjusts occupancy-driven expenses (janitorial, utilities, management) to what they would be at 95% or 100% occupancy, so your base year and comparison years stay apples to apples. Done correctly, gross-ups protect you. Done aggressively, they inflate your share. This check matters more in Denver right now than almost anywhere: metro office vacancy is sitting at a cycle-high 18.1% (SVN | Denver Commercial / CoStar, Q1 2026). Plenty of buildings are running two-thirds full, and how a landlord grosses up a two-thirds-full building changes your share materially. The methodology almost never appears on the statement itself. Ask for the calculation.

3. Cap compliance on controllable expenses. If you negotiated a cap, say 5% annually on controllables, check that the statement actually applies it, applies it to the right expense pool, and calculates it on the right base. Cumulative versus non-cumulative changes the answer by real money over a five-year term. If you don't have a cap and a negotiation is coming, here's how to negotiate operating expense caps on a Denver office lease.

4. Capital items dressed as operating expenses. A roof replacement, a new chiller, a lobby renovation... these are capital projects, and most leases either exclude them or require amortization over useful life. Look for "repairs" or "building improvements" lines that are suspiciously large, and one-time entries that didn't exist last year.

5. The management fee. Check the percentage against your lease, and check the base it's applied to. A 3% fee calculated on gross receipts including the fee itself, or on a revenue base when your lease specifies an expense base, quietly moves thousands of dollars. Also confirm the percentage didn't creep between years.

Any one of these flags justifies the next step. Not a fight. A letter.

The calendar is the whole game

Everything above is triage, not the audit itself. I've already written about what a full lease audit of your Denver office operating expenses looks like: what auditors find, what recovery looks like, and when it's worth the effort. This post exists because none of that matters if your window is closed.

The typical Denver office lease audit clause has three moving parts:

• A trigger date. The clock usually starts when the statement is delivered, and some leases deem it delivered when sent, not when your CFO actually reads it.
• A notice requirement. You generally have to object or request a review in writing, sometimes in a specific form, sometimes to a specific notice address. An email to the property manager saying "this looks high" may not preserve anything.
• A finality provision. After the window, the statement becomes final and binding, or you're deemed to have waived all objections.

To be clear, this is typical lease language, not a statute. Colorado law doesn't hand office tenants an audit right. Your lease does, and only on the lease's terms. Some leases have no audit clause at all, which is a different problem and a renewal negotiation point.

One seasonal note, since statements typically land in Q1 or Q2, roughly 90 to 120 days after year-end. If you're reading this in late spring or early summer, your statement probably arrived within the last 90 days, which means your window is likely still open... barely. Pull it, find the date it arrived, and read your audit clause today. If it arrived back in the first quarter, count the days before you do anything else. And either way, calendar next year's: a recurring March reminder with your lease's window length written into it, so the next statement gets read the week it lands instead of the month the window dies.

If the window is closing, send the letter first

Say you run the 30-minute pass, something looks off, and you count the days and find three weeks left. The instinct is to call the property manager and ask questions. Wrong order.

Send the notice first. Ask questions second.

A short written notice, delivered per your lease's requirements, stating that you're exercising your right to review the statement and reserving all rights pending that review. That's it. It accuses nobody of anything. It doesn't commit you to a full audit. Preserving the right costs you nothing, and it preserves everything.

Then start the conversation. Request the general ledger detail, the gross-up methodology, and the invoices behind the flagged line items. Most disputes at this stage resolve as corrections, not fights. Property accountants make mistakes, allocations get miscoded, and a landlord who wants to renew you has no interest in going to war over a management fee. I've seen more money recovered through one preserved deadline and two polite letters than through any amount of complaining after a window closed.

What I'd tell a friend running a Denver company: treat the reconciliation like a contract deadline, because that's what it is. The math can be checked later. The window can't be reopened.

Frequently asked questions

How long do I have to dispute an office operating expense reconciliation?

Whatever your lease says, and only that. Typical audit clauses in Denver office leases run 60 to 180 days from delivery of the annual statement, with 90 to 120 days most common. No Colorado statute extends it; after the contractual window, the statement is generally final and binding.

What is a gross-up provision and why does it matter in a half-empty building?

A gross-up adjusts variable expenses like janitorial, utilities, and management to a stated occupancy, usually 95% or 100%, so tenants pay a fair share regardless of how full the building is. With Denver metro office vacancy at 18.1% (SVN | Denver Commercial / CoStar, Q1 2026), many buildings operate well below full, so the gross-up methodology can swing your reconciliation by real dollars. Ask for the calculation; it's rarely shown on the statement.

Do I have to pay the reconciliation invoice while I'm disputing it?

Most leases require payment pending resolution, and withholding can put you in default. The standard play is to pay under protest: pay the invoice, send the written objection within the window, and recover through a credit or refund if the review finds errors. Confirm with your lease and your counsel before withholding anything.

What if my lease has no audit clause?

Then you're relying on the landlord's goodwill and general contract remedies, which is a weak position. You can still request backup documentation, and many landlords will provide it. The durable fix is negotiating an audit right at your next renewal or amendment: 120 to 180 days, records access, and a threshold above which the landlord pays the audit cost.

When do reconciliation statements usually arrive?

Most Denver office leases require the annual statement within 90 to 150 days after calendar year-end, so statements typically land between March and June. If yours is later than that, ask. Some leases also cut off the landlord's right to bill prior-year expenses after a deadline, and that one runs in your favor.

The reconciliation statement is the one document each year where operating expense overcharges either get caught or get locked in. The math is checkable. The audit is winnable. The deadline is the only part that's unforgiving, and it's the part almost nobody tracks.

If a reconciliation statement is sitting in your inbox, or you can't remember when your last one arrived, send it over. I'll give you a no-strings read of the statement and a short lease abstract that flags your audit window, notice requirements, and deadline dates. No pitch, no engagement required. Schedule a conversation.

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.