Why CAM Charges Can Change Year to Year

When you sign a commercial lease, your base rent is set in advance, typically with scheduled increases laid out clearly in the lease. CAM works differently. Those charges are estimated at the start of each year and reconciled against actual costs at the end. They can go up or down, and the factors driving them aren't always within anyone's control.

View of one of the commercial properties managed by BICP on Hawaii Island. The sealed parking lot is a good example of routine maintenance that qualifies as a CAM expense, passed through proportionally to tenants as part of keeping the property well maintained.

CAM (Common Area Maintenance) is the tenant's proportional share of the costs of operating and maintaining the property's common areas. Parking lots, landscaping, common hallways, shared restrooms, exterior lighting, and building insurance and taxes. Each tenant pays their share based on the square footage they occupy relative to the building as a whole. For a full breakdown of what qualifies as CAM and what doesn't, see -CAM vs Capital Expenses in Commercial Property Management.

This post covers what drives CAM changes, how capital expenses differ, and what tenants should know before signing the lease.

What Drives CAM Changes

CAM is a collection of real operating costs, and each one has its own factors pushing it up or down from year to year. Some are manageable. Others, like insurance markets or tax assessments, are largely outside anyone's control. That's what makes CAM variable.

Property Taxes

Property tax assessments are set by the county and can change annually. If a property's assessed value increases due to market conditions, improvements, or a reassessment cycle, the tax bill rises, and that increase is passed through to tenants as part of their CAM. Tenants in a well-managed building will see this reflected in their annual reconciliation.

Insurance

Insurance is one of the most significant and least predictable components of CAM on the Big Island. Premiums here are affected by lava zone designations, hurricane exposure, limited carrier availability, and broader market conditions that have been pushing commercial property insurance costs higher across Hawaii. A meaningful premium increase in a given year can have a real impact on CAM charges, and it's largely outside a property manager's control.

Utilities

Common area utilities, electricity for shared lighting, and water for landscaping and common restrooms fluctuate with usage and rate changes. Rate increases drive up both water and electricity prices. These are smaller line items in most properties, but they do move.

Vendor Costs

Landscaping, pest control, janitorial services, and other contracted vendors don't hold their prices flat year over year. Labor costs rise, supply costs rise, and vendor contracts come up for renewal. A property manager who actively manages vendor relationships and shops contracts periodically can help control this, but some increases are unavoidable.

Repairs

Some years, a property has minimal repair needs. Other years, a parking lot needs patching, the roof needs attention, or a plumbing issue in the common area requires immediate work. Routine repairs qualify as CAM and get passed through to tenants. The timing of those repairs affects what any given year looks like on the reconciliation.

How a Good Property Manager Handles Big Swings

The goal is never to surprise a tenant with a large reconciliation bill. That's bad for the tenant and bad for the landlord-tenant relationship. A few things a good property manager does to manage volatility:

Budget based on history and known changes, not round numbers. A CAM estimate built on actual prior-year costs and real projections is far more accurate than one that's padded or guessed. Accuracy upfront means fewer surprises at year-end.

Monitor costs throughout the year. Reconciliation happens once a year, but cost monitoring should occur year-round. If insurance comes in significantly higher than the mid-year estimate, a proactive property manager flags it rather than waiting for the annual reconciliation.

Communicate early when a significant change is coming. Tenants who are told in advance that CAM is tracking higher than estimated can plan for it. Tenants who find out by receiving a bill out of nowhere tend to feel blindsided, even when the charge is completely legitimate.

Look for offsets where possible. If one cost category runs higher than expected, a good property manager looks for areas where costs came in under budget to help offset the impact. The goal is to come as close to break-even as possible.

None of this eliminates volatility entirely. But it keeps swings as small as possible and makes the ones that do happen easier to absorb.

What Tenants Should Understand Before Signing

CAM charges are estimates. They are reconciled at the end of every year. Some years the reconciliation results in a credit back to the tenant. Some years it results in an additional charge.

Base rent is set in advance. Everything in CAM, taxes, insurance, maintenance, and utilities is subject to change based on actual costs.

The reconciliation is based on actual numbers. Tenants have the right to understand what they're being charged for. A well-managed property maintains documentation: invoices, contracts, and maintenance logs that back up every line item.

Big swings are possible. A well-run property tries to keep CAM changes gradual and predictable. But external factors, a significant insurance increase, an unexpected repair, a tax reassessment, can move the number more than anyone anticipated. Understanding that possibility upfront is part of making an informed leasing decision.

If you have questions about CAM or you're a property owner wondering how to handle reconciliation and tenant communication, we're happy to talk through it.

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