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  4. /Modified Gross Lease

Modified Gross Lease: CAM Audit Guide

Last updated: April 2026

By Angel Campa, Founder

Modified Gross Lease tenants face specific billing risks tied to how expenses are allocated and reconciled. The most common error appears in the section below. CAMAudit runs 14 forensic detection rules on your reconciliation statement to identify every recoverable dollar.

Most Common Overcharge

Landlords gradually shift exterior maintenance obligations onto the tenant through ambiguous lease language, billing for items like exterior window cleaning, parking lot maintenance, or snow removal that should remain the landlord's responsibility. Utility markups, where the landlord charges above the utility provider rate, are also common.

What Is a Modified Gross Lease?

A hybrid lease structure negotiated between a pure gross lease and a triple net lease. The base rent covers some operating expenses (typically property taxes and building insurance) while the tenant is directly responsible for other costs (typically utilities and interior maintenance). The exact allocation of expenses is negotiated and varies significantly between leases.

Modified Gross Lease Expense Pass-Throughs

Landlord typically covers: property taxes, building insurance, exterior maintenance, structural costs, and common area upkeep. Tenant typically covers: electricity, gas, water, HVAC maintenance, interior janitorial, and interior repairs. The split is entirely dictated by the lease, no universal standard applies.

Modified Gross Lease CAM Calculation & Billing

No formal CAM pool or annual reconciliation in most modified gross leases. Utilities are submetered or billed directly to the tenant by the landlord at the utility provider rate. Interior maintenance is tenant-directed. Some modified gross leases include a base year expense stop that functions similarly to a full-service gross lease escalation.

Red Flags to Watch

  • ▶Exterior maintenance (snow removal, parking lot repair) appearing on tenant invoices
  • ▶Utility bills at per-kWh or per-gallon rates above the utility provider rate
  • ▶Landlord billing for structural repairs or exterior painting
  • ▶Gradual creep of new line items not present in earlier lease years
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Audit Focus

Map every billed expense to a specific lease provision allowing it. Challenge any exterior or structural charges appearing on tenant invoices. Audit utility rates against the underlying utility provider bills to detect markups. If there is an expense stop, verify it is calculated using the same methodology as the base year. Property managers can automate gross-up calculations and tenant share allocations with CapVeri.com.

Common Industries

  • →Mid-size office (2,000–20,000 SF)
  • →Medical and dental offices
  • →Salon and spa
  • →Service retail

Explore Other Lease Types

Triple Net Lease (NNN)Double Net Lease (NN)Single Net Lease (N)Full Service Gross Lease (FSG)Absolute Net LeaseGround LeasePercentage LeaseIndustrial Gross LeaseRetail LeaseOffice LeaseMedical Office LeaseRetail Net Lease (NNN Retail)Flex Space LeaseBondable Net Lease
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Don't Overpay on Your Modified Gross Lease

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Related Guides

CAM OverchargesGuide
5 common modified gross lease overcharges (and how to catch them)
Lease LanguageOverview
Modified Gross Lease Explained: CAM Exposure, Cost Split, and Hidden Overcharges
Lease LanguageOverview
Modified Gross vs. NNN Lease: Side-by-Side Comparison [2026]
Lease LanguageOverview
Modified Gross vs. Full Service Gross Lease: Key Differences

Explore Related Resources

Concept ComparisonNNN vs Modified Gross LeaseConcept ComparisonCAM vs Operating ExpensesTenant TypeRetail StoreTenant TypeMedical OfficeLease ClauseAudit Rights ClauseLease ClauseCAM Exclusion Clause

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Related Resources

ResourcesCAM Audit by Tenant TypeToolsFree CAM Audit ToolsGlossaryCAM GlossaryToolsPro-Rata Share Calculator

Related Articles

  • Modified Gross Lease Guide
  • Modified Gross vs. NNN Lease
  • Modified Gross vs. Full Service Gross Lease
  • Expense Stops in Modified Gross Leases
  • 5 Common Modified Gross Lease Overcharges

Frequently asked questions

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This page provides general educational information. It is not legal advice and may not reflect the most current law in your state. Consult a licensed attorney for advice specific to your situation.