Ongoing maintenance, calibration, and software updates for the building management system (BMS) that controls HVAC, lighting, and access systems in common areas.
Key Takeaways
| Lease Type | Recoverable? | Controllable? |
|---|---|---|
| NNN | Yes | Yes |
| Modified Gross | Yes | Yes |
| Full-Service Gross | No | Yes |
CapEx Risk: This line item is commonly used to disguise capital expenditures as operating expenses. Verify all invoices against GAAP standards.
Approximate budget share: 1-3% of total CAM pool.
Building automation system (BMS) maintenance covers the routine upkeep of the centralized control platform that manages HVAC scheduling, lighting automation, access control, and energy monitoring across common areas. Recoverable costs include sensor calibration, controller firmware patches, preventive maintenance visits, and replacement of individual sensors or actuators that have reached end of life. The dispute risk arises when landlords perform a full BMS platform migration, replacing legacy controllers with new-generation hardware and software, and expense the entire project cost in a single CAM year. Under GAAP, a system-wide BMS upgrade extends the building's useful life and qualifies as a capital expenditure that must be amortized, typically over 10-15 years. Tenants should compare year-over-year BMS costs and request documentation for any invoice that references installation, migration, or replacement. Many leases classify BMS maintenance as a controllable expense, meaning year-over-year increases are capped at a defined percentage.
Overcharge Risk
$2,000-$15,000/year
typical annual overcharge when this line item is disputed
Landlords pass through the cost of a full BMS system replacement or upgrade as "maintenance," when the new system materially extends the building's useful life and should be capitalized.
This line item is commonly used to disguise capital expenditures as operating expenses. Capital expenditures must be excluded from CAM or amortized over their useful life per GAAP. If you see unusually high or one-time charges in this category, request all invoices and scope-of-work documentation before paying.
| Legitimate Charge | Suspicious Charge |
|---|---|
| Quarterly sensor calibration and preventive maintenance visits at consistent rates | A single invoice for "BMS platform migration" or "controller replacement" billed as maintenance |
| Annual software licensing fees for the existing BMS platform | New BMS software licensing fees appearing for the first time after a system upgrade |
| Replacement of individual failed sensors or actuators | Building-wide controller upgrade billed as "routine equipment replacement" |
Request vendor invoices and scope of work distinguishing routine calibration and sensor replacement from full system upgrades. A BMS platform migration or controller replacement extends the building's useful life and must be capitalized and amortized, not expensed in a single CAM year.
Check Your Building Automation / BMS Maintenance Charges
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