Dental office lease costs: why your CAM bill is higher than it should be
Dental practices occupy a specific position in the commercial real estate ecosystem. You need plumbing for multiple operatories, dedicated electrical capacity for dental units and X-ray equipment, specialized ventilation for amalgam separators and suction systems, and sometimes nitrous oxide plumbing. The space you build out is highly customized.
When you lease in a medical office building (MOB) or a strip mall, you're pooling shared expenses with neighbors whose infrastructure demands are very different from yours. And in many cases, the CAM pool includes costs that are disproportionate to your actual use of shared resources. Physicians in similar MOB situations face overlapping issues. See medical office CAM charges for a comparison of how the exposure differs between dental and general medical practices.
Here's the thing: the practice administrator who manages your lease payments and reconciliation review is usually managing that task alongside patient billing, staff scheduling, insurance credentialing, and supply ordering. The reconciliation gets reviewed quickly, if at all, before the true-up gets paid.
Medical office building (MOB) CAM: Common area maintenance charges in a medical office building, which may include specialized building systems not found in standard office buildings: medical-grade HVAC, biohazard waste handling infrastructure, specialized elevators, and healthcare security systems. These costs are allocated across all tenants, including dental practices, regardless of individual use.
The HVAC problem in dental office CAM
HVAC is the largest variable in dental office CAM exposure, and it creates two distinct problems.
Problem 1: Your practice has higher HVAC demand than standard office tenants.
A dental operatory requires consistent air temperature and humidity control. Your dental unit suction systems generate heat. Your sterilization area requires specific ventilation to comply with OSHA requirements for chemical vapor sterilizers and steam autoclaves. Some practices have nitrous oxide delivery systems that require dedicated ventilation.
The result is that your HVAC usage is higher per square foot than a general office tenant of the same size. In a multi-tenant building where HVAC is metered collectively and allocated by square footage, you are subsidizing tenants whose actual HVAC consumption is lower.
Problem 2: The building's shared HVAC costs get pooled and allocated equally.
In many MOBs, the central HVAC system maintenance, repair, and replacement costs are part of the CAM pool. Every tenant pays a proportional share based on square footage, not based on actual HVAC usage. If your 3,000 square foot operatory suite uses significantly more conditioned air and draws more electrical demand from shared systems than a 3,000 square foot billing and coding office next door, you're paying the same share despite different consumption.
Some leases address this through separate metering or submetering provisions. If yours doesn't, the allocation method defaults to pro-rata square footage and your practice absorbs costs that don't reflect your actual use.
Pro-rata share errors in MOBs
Pro-rata share errors are common in medical office buildings because the tenant mix changes frequently. Practices start, close, expand, and contract. When the denominator used to calculate your share doesn't accurately reflect the current rentable square footage of the building, your share shifts.
If that sounds familiar, it is the same denominator problem that affects all commercial tenants. In MOBs it is more acute because:
- MOBs often have a mix of tenants including the landlord's own staff or management offices. These are not always excluded from the rentable square footage denominator, which should reflect income-producing tenant space.
- Build-out variations change the usable floor area. If a previous tenant built out a significant portion of the space with equipment rooms, utility rooms, or specialized infrastructure, the "rentable" square footage attributed to that suite may not match the functional square footage.
- Vacancy changes the calculation. If a suite becomes vacant and the landlord does not adjust the denominator per your lease terms, your share percentage increases.
Management fees in medical office buildings
MOBs typically use professional property management. The management fee in a MOB lease is often 3%-6% of gross operating expenses. In a building with specialized systems, those operating expenses can be substantial, and the management fee percentage generates a large absolute dollar amount.
The specific risk for dental practices is management fee stacking: when the property manager charges both a management fee percentage and a separate administrative or supervisory fee. If your lease caps total fees at 5% and the landlord bills 4% management plus 1.5% administrative, you are paying 5.5% against a 5% cap. The management fee overcharge detection article explains how to calculate the exact dollar amount of this type of violation.
More on that below when we look at what CAMAudit flags in dental office reconciliations.
Biohazard and specialized waste allocation
Some MOBs include biohazard waste handling infrastructure in the CAM pool. Dental practices generate regulated medical waste: contaminated sharps, used gauze and cotton rolls, amalgam waste, and in some practices, extracted teeth. The disposal of this waste has specific regulatory requirements and associated costs.
If the MOB has centralized sharps disposal stations, biohazard waste collection, or amalgam waste handling that benefits some tenants more than others, the allocation of these costs across all tenants equally may not reflect their actual generation.
Check whether your CAM statement includes any line items related to medical waste, biohazard handling, or specialized waste management. If these items appear, confirm your lease's inclusion or exclusion of such costs.
"Dental practice administrators deal with 40 operational priorities before they open the CAM reconciliation. When they do look at it, they're comparing it to last year's bill, not to the lease. That's where overcharges survive." — Angel Campa, Founder of CAMAudit
Strip mall dental offices: different risks
Not all dental practices are in MOBs. Many occupy strip mall locations, often in healthcare-adjacent centers with pharmacies, vision centers, and urgent care clinics. The CAM dynamics differ.
In a strip center, the CAM pool covers parking lot maintenance, landscaping, exterior lighting, building insurance, property management, and sometimes shared signage and monument maintenance. The pro-rata share is calculated against the center's total leasable area.
For dental practices in strip centers, the specific risks are:
Anchor exclusion denominator shifts. If the center has a grocery or pharmacy anchor that is excluded from the CAM denominator, the remaining inline tenants share a higher percentage of costs. This is normal, but if the anchor's square footage changes (anchor closes, downsizes, or the landlord renegotiates their exclusion terms), and the denominator isn't adjusted correctly, your share shifts without your knowledge.
Capital expenses for parking and exterior. Dental practices rely heavily on convenient patient parking. When the landlord resurfaces the parking lot, replaces exterior lighting, or makes major landscaping changes, these costs can flow into the CAM pool as current-year expenses or as capital items. Your lease's treatment of capital expenses determines whether these should be amortized or excluded.
Signage and wayfinding costs. Healthcare tenants benefit from clear wayfinding signage. Monument signs, directional signage, and building directory costs sometimes appear in CAM. Confirm whether your lease includes or excludes these.
What to check in a dental office CAM reconciliation
Here is a practical checklist for reviewing your annual CAM statement:
Management fee percentage: Find your lease cap. Calculate the fee percentage from the reconciliation. Compare. If there are multiple fee line items, add them together before comparing to the cap.
Pro-rata share denominator: Request the rent roll from your landlord. Calculate your share percentage. Compare to what the reconciliation used.
Capital versus operating line items: Look for large line items. Parking, HVAC, roof, and major mechanical items may be capital expenses requiring amortization under your lease.
HVAC-specific charges: If HVAC costs appear as a separate line item, confirm whether this is a shared cost or a building operating expense included in CAM.
Specialized costs: Any line item related to medical waste, biohazard disposal, or building-wide regulated services. Confirm inclusion or exclusion under your lease.
Year-over-year variance: A significant increase in any line item without explanation is worth requesting documentation for.
CAMAudit processes your reconciliation statement and flags potential violations automatically. Upload your statement for a free scan to see which items warrant further review.
The audit window for dental practices
Most commercial leases give tenants 12 months from receipt of the annual reconciliation to contest charges. Some MOB leases extend this to 18 months. Once the window closes, the charges are final.
For a dental practice with a stable lease and a landlord who administers CAM consistently, the annual review can be brief. But if you haven't reviewed your CAM statement carefully in prior years, you may have recoverable overcharges within the lookback window that are worth examining before they expire. Use the should you audit tool to check whether your annual CAM bill size makes a formal review worthwhile.
Questions dental practice administrators ask about CAM
Frequently Asked Questions
Is the HVAC cost in my dental office CAM a shared expense or my own?
It depends on your lease. In many MOBs, central HVAC system maintenance and operation is a shared CAM expense allocated by square footage. Dedicated HVAC units serving only your suite may be a separate tenant responsibility. Read your lease's mechanical systems provisions carefully.
What is a reasonable management fee percentage in a medical office building lease?
Management fees in MOB leases commonly range from 3%-6% of gross operating expenses. The key is what your lease specifically caps the fee at, and whether that cap covers all fee types (management, administrative, supervisory) or just the base management fee.
Can my dental practice contest a CAM charge from a prior year?
Yes, if the audit window for that year is still open. Most leases provide a 12-24 month window from receipt of the reconciliation. After that window closes, the charges are final even if they were incorrect.
What should I request from my landlord to verify the pro-rata share calculation?
Request a current rent roll showing all suites, their square footage, and their occupancy status. Compare the total rentable area on the rent roll to the denominator used in your reconciliation.
Does biohazard waste disposal appear in CAM for dental practices?
It depends on the building and the lease. Some MOBs include centralized waste handling infrastructure in CAM. Others treat it as a building-wide excluded expense or a tenant responsibility. Review your lease's CAM inclusion and exclusion lists.
Sources
- American Dental Association. Practice management resources and dental office operational guidance. https://www.ada.org/
- IREM (Institute of Real Estate Management). Operating expense reconciliation resources. https://www.irem.org/
- OSHA. Dental healthcare worker safety and ventilation requirements. https://www.osha.gov/dental/
- Tango Analytics. "CAM Reconciliation: Why tenants should verify the math." https://tangoanalytics.com/blog/cam-reconciliation/
Upload your dental office CAM statement to CAMAudit for a free scan. See which charges in your reconciliation warrant a closer look before your audit window closes.