The anchor left. Maybe it was a department store anchor in a regional mall. Maybe it was the large office tenant who occupied three floors in your mixed-use building. Maybe it was the grocery store that anchored your strip center and drove most of the foot traffic.
Whatever the context, you're now a smaller tenant in a building that lost its biggest occupant. And within the next annual CAM reconciliation cycle, you may notice something: your CAM charges went up, not down.
That feels backwards. The anchor was using more of the parking lot, more of the HVAC, more of everything. How can the building cost more to operate with fewer occupants? The answer lies in how your lease defines the denominator used to calculate your pro-rata share — and whether your landlord is using the right one.
What an Anchor Tenant Is and Why Their Departure Matters
An anchor tenant is typically the largest occupant in a commercial property — by square footage, by traffic generation, or by both. In retail, anchors (grocery stores, big-box retailers, department stores) generate the foot traffic that benefits all the smaller tenants around them. In office buildings, the anchor might be a single tenant occupying 40–60% of the leasable space. In mixed-use, it could be the ground-floor retail anchor whose lease was structured to subsidize the rest of the building.
When an anchor leaves, several things happen simultaneously:
- The total occupied square footage drops significantly
- The landlord continues operating the property (lights, HVAC common areas, landscaping, parking lot maintenance, security)
- The property may actively market to replace the anchor, sometimes for months or years
- The remaining tenants are still paying — and potentially paying more
The question is whether that increase is legitimate under your lease, or whether it's cost-shifting that your lease language doesn't authorize.
The Denominator Problem
Your CAM share is calculated as a fraction: your square footage divided by some measure of the total property. That denominator is everything. Change it, and your share changes.
There are two main versions of the denominator:
Total leasable area (TLA): Your share is your square footage divided by the total leasable square footage of the property, regardless of how much is actually occupied. If the property has 200,000 square feet and you lease 5,000, your share is 2.5% — whether the building is 95% occupied or 40% occupied.
Occupied leasable area: Your share is your square footage divided by the square footage of all currently-occupied units. Same 5,000-square-foot tenant, but now the denominator shrinks as vacancy increases. If occupancy drops to 100,000 square feet, your share jumps from 2.5% to 5%.
The second version — dividing by occupied area — is what causes CAM bills to spike when an anchor leaves. The costs stay roughly constant. The denominator gets smaller. Each remaining tenant's percentage share goes up, sometimes dramatically.
Whether your landlord can use the occupied-area denominator depends entirely on your lease language. Many leases specify total leasable area, which protects tenants from this kind of cost-shifting. Others use language that permits or even requires the landlord to recalculate based on occupancy. Still others are ambiguous — and ambiguity in a landlord-drafted lease tends to get resolved in the landlord's favor unless challenged.
Lease Language That Protects You
Tenant-favorable lease language on this point typically looks like:
- "Tenant's pro-rata share shall be calculated by dividing the rentable square footage of the Premises by the total rentable square footage of the Building, whether or not any portion thereof is occupied."
- "In no event shall Tenant's pro-rata share exceed X%"
- "The denominator used to calculate pro-rata share shall not be less than [percentage] of the total leasable area of the Property"
Any of these provisions protects you from the denominator problem. If vacancy increases, your nominal percentage may stay fixed (or have a floor), limiting the landlord's ability to shift costs onto remaining tenants.
Lease Language That Leaves You Exposed
Language that works against tenants in anchor-departure scenarios includes:
- "Tenant's pro-rata share shall be calculated based on occupied leasable area from time to time"
- "Landlord may adjust Tenant's pro-rata share based on changes in occupancy"
- Any provision that allows the landlord to gross up CAM charges to reflect 95% occupancy — which is meant to be a tenant protection but can be misapplied to create overcharges after anchor departure (more on this below)
If your lease uses occupied-area denominator language, that doesn't necessarily mean the landlord can charge you unlimited amounts. Many leases with that language still cap the tenant's share or require the landlord to use reasonable efforts to re-lease the anchor space. Whether those conditions are being met is a factual question.
Gross-Up Violations After Anchor Departure
The gross-up provision is supposed to protect tenants in exactly this situation. The theory: if variable costs like HVAC would naturally be lower in a less-occupied building, the landlord shouldn't be able to underprovide services during vacancy and then bill tenants as if the building were full.
Gross-up allows the landlord to adjust variable costs upward to what they would have been at a defined occupancy level (typically 95%), so the per-square-foot cost remains stable even as occupancy fluctuates.
But after an anchor departure, gross-up can create a new overcharge problem:
Grossing up fixed costs. Property taxes, insurance, and certain structural expenses don't change with occupancy. Applying a gross-up adjustment to these costs inflates the total beyond what the provision authorizes.
Wrong occupancy base. If the building drops to 60% occupancy after the anchor leaves, the gross-up provision should adjust variable costs to reflect 95% occupancy. But if the landlord uses actual 60% occupancy figures rather than the lease-specified threshold, or uses the anchor's space in the denominator while grossing up as if it's occupied, the math produces inconsistent results that favor the landlord.
Gross-up applied when occupancy already exceeded the threshold. Some leases only permit gross-up adjustments when occupancy falls below a threshold. If the building was at 92% before the anchor left and dropped to 75% after — but the threshold is 90% — the gross-up may not be authorized at that point.
Running these calculations correctly requires knowing your lease's specific gross-up language, the actual occupancy at the time of each reconciliation, and which cost categories the provision covers. These are exactly the kinds of errors that don't show up on the face of a reconciliation statement.
A Pattern That Repeats
Here's how this plays out in practice. A retail tenant occupies 3,800 square feet in a neighborhood strip center anchored by a grocery store. The grocery store's lease was structured with below-market rent in exchange for traffic generation — a common anchor deal. When the grocery store vacates, the landlord continues operating the center, marketing heavily to fill the 28,000-square-foot anchor space.
During the first full year of vacancy, the remaining tenant's CAM charges increase by about 40%. The landlord's explanation is that the anchor's departure changed the occupancy-based denominator. But there's also a gross-up component in the reconciliation — and it's been applied to property taxes, which don't vary with occupancy. That piece alone accounts for several thousand dollars in unjustified additional charges.
This isn't unusual. It's the kind of multi-layer error that's hard to detect without doing the math against your specific lease language.
What to Look for in Your Lease
If an anchor tenant in your property has recently departed, pull your lease and check these provisions before your next reconciliation statement arrives:
- Pro-rata share definition: Does it use total leasable area or occupied area as the denominator?
- Gross-up clause: What costs are subject to gross-up? What occupancy threshold triggers it? Is it applying to costs that shouldn't be affected by vacancy?
- Exclusions from CAM: Is the landlord's cost to market and re-lease the anchor space being charged to tenants? It typically shouldn't be.
- Cap provisions: If your lease includes a CAM cap, has it been breached after the anchor departure?
- Anchor co-tenancy provisions: Some leases actually give tenants remedies (rent reduction, early termination rights) if a specified anchor vacates. Check whether you have one.
How CAMAudit Flags These Issues
When I built CAMAudit, anchor-departure scenarios were part of what I was thinking about — specifically the fact that errors in these situations are structural rather than obvious. They hide in the relationship between the reconciliation statement and the lease language.
CAMAudit checks the pro-rata share calculation against the denominator your lease specifies, flags gross-up violations including the application of gross-up to excluded cost categories, identifies management fee overcharges that often compound when a larger cost pool is being used post-anchor departure, and compares year-over-year changes in CAM components against the lease's cap provisions.
The tool doesn't replace an attorney for lease interpretation. But it identifies where the numbers don't add up so you know which specific provisions to scrutinize.
40% of CAM reconciliations contain material errors (Tango Analytics, cited by PredictAP, 2023)
What You Can Actually Do
If you suspect your CAM charges increased improperly after an anchor departure:
Invoke your audit rights. Request all supporting documentation for the reconciliation year in question — the occupancy schedule the landlord used, the cost pool breakdown, gross-up calculations, management fee basis.
Run the math against your lease. Check whether the denominator used matches your lease definition. Check whether gross-up was applied only to qualifying variable costs. Check whether any costs in the pool are excluded by your lease.
Send a formal dispute letter. Document the specific discrepancies, the lease provisions they violate, and the amount at issue. Pay under protest while the dispute is pending — don't withhold rent.
Negotiate a corrected reconciliation. Most landlords, when presented with a specific, documented calculation error and the relevant lease language, would rather issue a credit than litigate.
"The anchor leaving is when everything gets recalculated — and recalculation is when errors get introduced. Tenants in buildings with recent vacancies should be auditing, not just renewing." — Angel Campa, Founder of CAMAudit