CAM Charges After a Building Sale: What the New Owner Can and Cannot Change
Buildings change hands. When yours does, you may notice your CAM charges increase substantially in the year following the sale. Some of that increase is legitimate. Some is not. Knowing the difference protects your budget and your leverage in any dispute.
Three things commonly drive CAM spikes after ownership transfers:
- Property tax reassessment
- CAM cap resets
- New management fees and overhead
Each requires different analysis.
Property Tax Reassessment
In most US states, real property is assessed at the sale price when it changes hands. If a building sells for significantly more than its prior assessed value, the property tax bill can jump dramatically, and most commercial leases pass property taxes through to tenants as CAM or as a separate line item.
California's Proposition 13 system is the most widely known example. Properties are assessed at purchase price, then capped at 2% annual increases until the next sale. A building that sold for $10 million in 2005 but is now worth $30 million will be reassessed to $30 million upon sale, tripling the property tax basis.
At a 1.1% effective tax rate, the annual tax on that building goes from roughly $110,000 to $330,000, a $220,000 increase in the CAM pool.
On a 10% pro-rata share, your CAM increases by $22,000 per year from property taxes alone. That is before any management or operational changes.
Is This Legal?
In most cases, yes. Property tax pass-throughs are standard in NNN leases. If your lease passes taxes through to tenants, a reassessment after sale is a legitimate increase. The new owner did not manufacture the tax increase. The tax authority set the new assessed value based on the transaction.
What is worth checking:
- Does your lease have an exclusion for reassessment charges triggered by a voluntary ownership transfer? Some tenant-favorable leases include this.
- Are taxes correctly allocated to your period of occupancy vs. the prior owner's period?
- Is the tax increase being allocated correctly across tenants per your pro-rata share calculation?
CAM Cap Resets After Sale
Many commercial leases structure CAM caps based on a base year. If the cap is expressed as a percentage increase over the prior year, it does not reset at sale. But if the cap is based on an absolute dollar amount or a base year tied to the original lease commencement, a sale can trigger a reset, or the new owner may attempt one.
Common scenario: a cumulative CAM cap is based on Year 1 of the tenancy. After 5 years, the cap has accumulated meaningful protection. The building sells. The new owner argues that the cap should reset to the current year's actual costs as the new "base year."
This argument is generally incorrect unless the lease explicitly provides for a reset upon assignment or sale. The lease does not change when the building sells. Your tenant rights and the cap structure you negotiated transfer with the property.
If a new owner sends you an amendment proposing a cap reset, you do not have to sign it. Your existing lease terms control.
Due Diligence Clause Exposure
Some leases include a clause that gives the buyer or the tenant a recalculation right based on actual conditions at time of sale. These clauses are rare but can affect cap base calculations. Review your lease for language tied to "ownership transfer," "assignment," or "sale of the property" in the CAM or cap sections.
New Management Fees After Ownership Transfer
New owners typically replace property management. The incoming management company may charge different rates, use different billing structures, or add fees not charged by the prior manager.
What the new owner cannot do: charge management fees that violate your existing lease terms. If your lease caps management fees at 4% of controllable expenses, the new owner's 6% standard rate does not override your lease.
What to watch for:
- New "administrative fees" or "portfolio management fees" not in the prior reconciliation
- Management fee base changes (new manager applying the fee to gross CAM including taxes and insurance)
- Transition fees for the ownership handover billed as CAM
Prior-Year Corrections Under New Ownership
New owners sometimes discover billing errors from the prior owner and attempt to correct them in the first post-sale reconciliation. "We found that you were undercharged in 2022 and 2023 and are correcting this now."
Your lease's audit rights window protects you here. If the window for disputing 2022 and 2023 charges has closed, the new owner generally cannot reopen those periods. The statute of limitations on prior reconciliations does not restart with a change in ownership.
Due Diligence Checklist: If Your Building Is Being Sold
- Review your lease for any ownership-transfer clauses affecting CAM, caps, or management fees.
- Confirm your current CAM cap structure and document the base year or base amount.
- Request the current property tax assessment and calculate potential reassessment exposure.
- Identify any "extraordinary items" in recent reconciliations that the new owner might dispute or reassert.
- Review your audit rights and any open dispute windows for prior years.
- Get the current year's reconciliation resolved before the sale closes if possible.
What Documentation to Request Post-Sale
- Notice of the ownership transfer and the effective date
- Contact information for the new property management company
- First reconciliation from the new owner with line-by-line comparison to the prior year
- New property tax assessment and calculation of the year-over-year change
- Any management agreement between the new owner and their property manager
What tenants ask about CAM charges after a building sale
My CAM increased 40% the year after the building sold. Is that typical?
A 40% spike usually indicates a significant property tax reassessment, particularly in states like California, Texas, or New York where assessments at sale are common. Review the property tax line item specifically. If taxes drove most of the increase, it may be legitimate. If the increase is spread across controllable expenses, that warrants a closer look.
The new owner says they found errors in the prior owner's reconciliations and wants to bill me retroactively. Do I have to pay?
Only if you are within your lease's audit window for those prior years. If the window has closed, the new owner cannot reopen prior periods. The change in ownership does not extend or reset your lease terms. Respond in writing, citing the audit rights provision and the window for each year.
Can the new owner require a different audit firm or different documentation procedures?
New owners can establish their own administrative procedures going forward, but they cannot retroactively change terms that applied under the prior owner. If your lease gives you specific audit rights (right to inspect original invoices, right to use your own CPA), those rights do not change.
My lease has a base year CAM structure. Does the building sale reset the base year?
No, unless your lease contains specific language tying the base year to ownership. The base year was established at lease execution and does not reset upon sale. If the new owner argues otherwise, request the specific lease language they rely on.
What about cap improvements the new owner makes immediately after purchase? Can those go into CAM?
Post-sale capital improvements are subject to the same rules as any other CapEx: your lease governs whether they can be amortized through CAM, and if so, under what conditions (life-safety, cost-saving, etc.). A new owner's renovation program does not automatically become a CAM recoverable item.
CAMAudit's detection engine flags year-over-year CAM spikes correlated with ownership transfer events and identifies property tax reassessment components in the reconciliation.
See also: Property Tax CAM Pass-Through, for detailed analysis of how taxes flow through CAM.
Related: CAM Increase Audit Guide | CAM Reconciliation Review Checklist
Frequently Asked Questions
Why did my CAM charges increase after my building sold?
Three things commonly drive CAM spikes after ownership transfers: property tax reassessment at the sale price (which can triple the tax basis in states like California), new management fees under a different management company, and transition costs or overhead the new owner attempts to pass through. Review each category separately to determine what is legitimate.
Can a new building owner reset my CAM cap after buying the property?
No, unless your lease contains specific language tying the cap to ownership. The lease does not change when the building sells. Your existing tenant rights and cap structure transfer with the property. If a new owner sends you an amendment proposing a cap reset, you do not have to sign it.
Does a building sale reset my base year for CAM purposes?
No. The base year was established at lease execution and does not reset upon sale unless your lease contains specific language linking the base year to ownership transfers. If the new owner argues otherwise, ask them to cite the specific lease provision they are relying on.
Can the new owner bill me for overcharges they claim the prior owner made?
Only if you are within the lease's audit window for those prior years. If those windows have closed, the new owner cannot reopen prior periods. The change in ownership does not extend or reset your lease terms. Respond in writing citing the audit rights provision and the specific window for each year at issue.
What should I do to protect myself when my building is about to be sold?
Review your lease for ownership-transfer clauses affecting CAM, caps, or management fees. Document your current CAM cap structure and base year. Request the current property tax assessment to assess reassessment exposure. Resolve any open dispute windows for prior years before the sale closes if possible, and get contact information for the new property manager immediately after the transfer.