Michigan commercial tenants in Detroit, Grand Rapids, and Ann Arbor can audit CAM charges going back years. Here is what state law allows and how to start.
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See How It WorksSee a sample report firstMichigan's commercial real estate market runs from Detroit's revitalized Midtown and New Center corridors to Grand Rapids' growing office and retail base to Ann Arbor's university-adjacent commercial strip. Across those markets, commercial tenants operate under NNN and modified gross leases that pass through operating costs — and across all of them, the same systematic billing errors show up.
40% of CAM reconciliations contain material errors (Tango Analytics / PredictAP, 2023)
I built CAMAudit after running reconciliation samples from published audit cases through a systematic rules framework. The pattern that emerged was consistent: management fees calculated on overcounted bases, pro-rata shares that do not match the actual GLA calculation, and capital expenditures slipped into operating expense line items without explicit lease authorization. Michigan tenants are not immune to any of these, and the state's six-year statute of limitations means that errors going back several years remain recoverable.
Michigan commercial tenants have six years to bring a written contract claim under Mich. Comp. Laws § 600.5807(8). Your commercial lease is a written contract. A CAM overcharge is a breach of that contract. You generally have six years from when each annual overpayment was made to bring a recovery action.
Six years gives Michigan tenants a meaningful recovery window. A tenant in a ten-year lease who has never reviewed a reconciliation can potentially recover overcharges from the most recent six annual cycles, subject to any shorter windows written into the lease's audit clause.
Accrual runs from the date of breach — typically the date each annual overpayment was made or the reconciliation containing the overcharge was delivered. Michigan courts apply this accrual standard consistently to written contract claims.
Michigan has no statute specifically protecting commercial tenants in CAM disputes. The Michigan residential landlord-tenant statutes (Mich. Comp. Laws § 554.601 et seq.) apply to residential tenants only. Commercial CAM disputes are governed by general Michigan contract law and the lease terms.
This means your audit rights in Michigan come from the lease. Most institutional leases — those used by major Detroit-area developers, Grand Rapids commercial operators, and Ann Arbor retail and office landlords — include audit clauses with a 90-to-180-day window after annual reconciliation delivery. Smaller landlords using non-standard lease forms may not include audit rights at all. In either case, the six-year statutory window remains available for breach of contract claims regardless of the lease audit clause.
Michigan's prejudgment interest rate is 5 percent per annum under Mich. Comp. Laws § 600.6013. This is one of the lower legal interest rates among the states covered in this guide. If your lease specifies a different interest rate for disputes or overcharges, the contract rate controls.
The relatively low statutory interest rate means that the primary recovery value in Michigan CAM disputes is the overcharge principal itself — the dollar amount of the overbilling — rather than accumulated interest.
Michigan commercial leases follow Midwest market norms that create specific CAM risk profiles:
Older industrial and retail stock. Detroit-area commercial properties include significant building inventory from the 1970s through 1990s. These buildings have aging infrastructure — mechanical systems, roofing, parking surfaces — that generates both higher maintenance costs and more opportunities for capital expense misclassification. When aging equipment reaches end-of-life and is replaced rather than maintained, the replacement cost may be a capital expenditure that the lease excludes from CAM.
Recovery-era lease terms in Detroit. Detroit's commercial real estate recovery — accelerating from roughly 2012 onward — brought a wave of leases signed at favorable tenant terms, then renegotiated at renewal with terms that shifted more cost exposure to tenants. Some of those renewed leases reduced or eliminated CAM caps, broadened the management fee base, or narrowed the exclusions list. Tenants who signed renewals without tracking these changes may be paying more than their original lease would have required.
University market dynamics in Ann Arbor. Ann Arbor commercial tenants — particularly those in the Liberty Street and Main Street corridors, or in medical and research office adjacent to the University of Michigan campus — operate in a market with sustained high demand and correspondingly strong landlord negotiating positions. Leases in this submarket sometimes lack robust tenant protections, and audit clauses are not always present.
Detroit-area commercial tenants — in Midtown, New Center, Corktown, Royal Oak, and the suburban retail corridors of Oakland and Macomb counties — encounter the most common NNN overcharge patterns:
Management fee overcharges. Rule 3 checks whether the management fee was calculated on the correct base. Michigan retail leases commonly permit a management fee of 3–5 percent of operating expenses. The error occurs when the landlord calculates that fee on a base that includes real estate taxes, insurance, and capital expenditures — items typically excluded from the CAM pool before the fee is applied. On a 2,500 SF inline retail space paying $35,000 in annual CAM, a management fee applied to a $15,000 overcounted base adds $450–$750 annually. Over six years, that is $2,700–$4,500.
Capital expense misclassification. Rule 12 and Rule 2 flag capital improvements billed as operating costs. Detroit-area commercial properties have significant infrastructure replacement needs — HVAC systems, elevators, parking structures, roofing. When a landlord replaces a flat roof on a 1985-era strip center or installs a new HVAC plant, those costs may be capital expenditures under the lease, not CAM-able maintenance expenses. The distinction matters: capital expenditures are typically excluded from the operating expense pool or must be amortized over their useful life if the lease permits any passthrough at all.
Pro-rata share errors. Rule 4 checks your stated percentage share against your actual leased SF divided by the GLA used as the denominator. In Detroit-area centers that have lost anchor tenants, added pad users, or converted former anchor spaces to multi-tenant suites, the GLA calculation often has not kept pace with the physical changes. A 4 percent denominator error on a $40,000 annual CAM bill costs $1,600 per year — $9,600 over six years.
CAM cap violations. Retail leases signed during and after Detroit's recovery period often include CAM caps at 5 percent per year compounded. Rule 6 checks that the year-over-year increase in billed CAM does not exceed that cap. Cap base resets during lease renewals are a common error: a landlord who resets the cap base to the inflated cost year immediately before the renewal strips years of compounded protection.
Grand Rapids is one of Michigan's fastest-growing commercial markets, with a dense office and retail base in downtown and the surrounding medical mile, East Beltline, and Knapp's Corner submarkets.
Base year errors in office leases. Grand Rapids office leases frequently use a base year stop structure. Rule 7 checks that the base year operating expenses were correctly established and that the landlord has not been billing above-stop amounts before the stop was exceeded. An incorrectly low base year inflates every subsequent year's above-stop obligation.
Gross-up violations. Grand Rapids experienced significant office vacancy during 2020–2022, and gross-up provisions were applied during that period to adjust variable costs to hypothetical full-occupancy levels. Rule 5 checks that only variable costs — utilities, janitorial, maintenance labor — were included in the gross-up calculation, not fixed costs like property taxes or insurance. Including fixed costs in a gross-up inflates the adjusted total and passes phantom occupancy costs to tenants.
Controllable expenses cap overcharges. Some Grand Rapids office leases cap controllable expenses — landscaping, janitorial, property management — separately from non-controllable items like insurance and real estate taxes. Rule 8 checks that items are correctly classified and that the controllable cap has not been exceeded.
True-up verification. Ann Arbor tenants — particularly in medical office buildings where monthly estimated CAM payments are common — sometimes receive annual reconciliation statements where the true-up calculation contains errors. Rule 18 checks that the difference between estimated payments and actual annual costs was correctly calculated and that the resulting credit or additional charge was properly applied.
Insurance overcharges. Rule 9 checks whether the type of insurance in the CAM line falls within the scope of what your lease authorizes. Umbrella policies, directors and officers insurance, and environmental coverage occasionally appear in insurance line items when the lease only authorizes standard commercial property and liability coverage.
Landlord overhead. Rule 13 flags administrative costs — leasing commissions, internal accounting, regional management overhead — billed to individual building CAM pools. In Ann Arbor's tightly held commercial property market, some landlords own multiple buildings and allocate administrative overhead across their portfolio in ways that may not be authorized by individual lease agreements.
Locate the audit rights provision in your lease. Note the deadline for requesting records after the annual reconciliation — typically 90 to 180 days. If you are approaching that window for a recent year, prioritize sending the audit request before it closes. For older years within the six-year statutory period but outside the lease audit window, Michigan contract law may still support a breach of contract claim — consult a commercial lease attorney.
Michigan has no statutory delivery method requirement for commercial CAM demand letters. Use certified mail as the standard; if your lease permits email notice, send it electronically as well and retain confirmation. The request should:
Upload your lease and CAM reconciliation statements to CAMAudit. The platform runs all 14 detection rules in under 15 minutes and produces a flagged report showing each potential issue, the specific lease provision it may violate, and the calculated dollar impact.
Organize findings year by year across the six-year lookback. Apply Michigan's 5 percent prejudgment interest rate under Mich. Comp. Laws § 600.6013 if applicable, or whatever rate your lease specifies. Present the claim as a specific dollar amount with supporting detail by overcharge category.
CAMAudit generates a dispute letter draft grounded in the audit findings and Michigan's statutory framework. The demand letter should identify the overcharge by category, reference the specific lease provision that was violated, state the recovery amount, and request a response within 30 days.
Michigan commercial landlords generally respond to well-documented demand letters. The most common outcomes:
Negotiated credit. The landlord applies a credit to future CAM obligations. This is the most common resolution for clear calculation errors — management fee overstatements, pro-rata share discrepancies, and cap violations are often acknowledged and credited without extended negotiation.
Partial settlement. For larger claims or cases involving disputed characterizations — whether an expense is capital or operating, whether a cost is within the permitted scope — landlords sometimes offer a partial settlement that avoids the cost of producing all records and defending a litigation.
Mediation or litigation. If the landlord contests the findings or fails to respond, Michigan District Courts handle smaller commercial lease claims; Circuit Courts handle larger claims. Michigan courts apply general contract law; the strength of the case depends on the lease language and the quality of the supporting evidence.
The six-year statutory window gives Michigan tenants meaningful time to build a documented record and pursue a claim methodically.
| Item | Detail |
|---|---|
| Written contract SOL | 6 years (Mich. Comp. Laws § 600.5807(8)) |
| Commercial CAM statute | None |
| Accrual rule | Date of breach (each overpayment) |
| Prejudgment interest rate | 5% per annum (Mich. Comp. Laws § 600.6013) |
| Audit rights | Lease-defined only |
| Demand delivery | No statutory requirement; certified mail is conventional |
How far back can Michigan commercial tenants go to recover CAM overcharges?
Michigan's statute of limitations for written contracts is 6 years under Mich. Comp. Laws § 600.5807(8). Each annual reconciliation that contained an overcharge triggers its own 6-year window from when the overpayment was made. A tenant in an 8-year lease can potentially recover overcharges from the last 6 reconciliation cycles, subject to any shorter windows written into the lease's audit clause.
Does Michigan have any law specifically protecting commercial tenants in CAM disputes?
No. Michigan's residential landlord-tenant statutes apply to residential tenants only. Commercial CAM disputes are governed by general contract law and the lease. Audit rights, dispute windows, and documentation obligations all come from the lease itself. The 6-year statute of limitations under Mich. Comp. Laws § 600.5807(8) applies to written contract claims generally, which includes commercial lease overcharge claims.
What CAM overcharges are most common in Detroit-area commercial leases?
Management fee overcharges and capital expense misclassification are the most frequent patterns in Detroit-area commercial leases. Management fees calculated on bases that include real estate taxes, insurance, and capital expenditures — when those items are excluded from the CAM pool under the lease — generate systematic annual overcharges. Capital expense misclassification is particularly common in older Detroit-area properties where aging infrastructure generates large replacement costs that landlords sometimes pass through as maintenance expenses. CAMAudit's Rule 3 checks management fee calculations and Rules 2 and 12 flag capital expense misclassification.
If my Grand Rapids office lease has a base year stop, how do I know if the stop is being applied correctly?
A base year stop means you pay only the amount by which annual operating expenses exceed the base year level. CAMAudit's Rule 7 checks that the base year was correctly established and that the landlord is not billing above-stop amounts before the stop was actually exceeded. Common errors include setting the base year in an abnormally low-cost period — deflating it — which inflates every subsequent year's above-stop obligation, or using a base year denominator (such as a low-occupancy GLA) that understates the per-SF base expense. Upload your lease and reconciliation statements to see whether Rule 7 flags any issues.
Legal Disclaimer: This article provides general educational information about Michigan commercial lease law and CAM dispute rights. CAM audit rights, statute of limitations, and dispute procedures vary by lease and jurisdiction. Consult a licensed Michigan attorney for advice specific to your situation.
