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  4. /Full Service Gross Lease (FSG)

Full Service Gross Lease (FSG): CAM Audit Guide

Last updated: April 2026

By Angel Campa, Founder

Full Service Gross Lease (FSG) 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

Improper gross-up of fixed expenses. Gross-up provisions are designed to adjust variable expenses (utilities, janitorial) to reflect 95% occupancy. Fixed expenses like property taxes and insurance do not vary with occupancy, grossing them up inflates the base year stop downward and the tenant's escalation exposure upward. This is one of the most technically complex and financially significant overcharge categories.

What Is a Full Service Gross Lease (FSG)?

A lease structure where the tenant pays a single flat monthly rent that includes all operating expenses, property taxes, insurance, utilities, maintenance, janitorial, and management, for the base year. The landlord absorbs all operating costs up to the base year expense stop. In subsequent years, tenants typically pay their pro-rata share of expense increases above the base year stop.

Full Service Gross Lease (FSG) Expense Pass-Throughs

Base year: landlord covers all operating expenses. Years 2+: tenant pays pro-rata share of expense increases above the base year stop (also called expense escalations or operating expense contributions). Common inclusions in escalations: management fees, janitorial, utilities, maintenance, and insurance.

Full Service Gross Lease (FSG) CAM Calculation & Billing

No monthly CAM estimate. At year-end, landlord calculates actual total operating expenses for the year, compares to the base year stop (typically grossed up to 95% occupancy), and bills each tenant their pro-rata share of the excess. Tenants in multi-story office buildings often see escalation bills ranging from $1–$8/SF depending on market conditions and building age.

Red Flags to Watch

  • ▶Gross-up applied to property taxes or base insurance premium (both are fixed costs)
  • ▶Base year that is artificially low due to construction, major vacancy, or concession period
  • ▶After-hours HVAC billed at a flat rate significantly above the actual utility cost
  • ▶Management fee calculated on grossed-up expenses rather than actual collected rents
  • ▶Expense year and base year using different accounting methodologies
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Audit Focus

Verify that only variable expenses are grossed up (utilities, janitorial, trash removal). Confirm fixed expenses (taxes, insurance, management fee base) are NOT included in the gross-up calculation. Audit the base year expense total against actual invoices. Check that after-hours HVAC is billed at cost, not at an inflated rate.

Common Industries

  • →Class A and B office (high-rise, suburban)
  • →Professional services firms
  • →Financial services
  • →Technology companies
  • →Law and accounting firms

Explore Other Lease Types

Triple Net Lease (NNN)Double Net Lease (NN)Single Net Lease (N)Modified Gross LeaseAbsolute Net LeaseGround LeasePercentage LeaseIndustrial Gross LeaseRetail LeaseOffice LeaseMedical Office LeaseRetail Net Lease (NNN Retail)Flex Space LeaseBondable Net Lease
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Related Guides

CAM OverchargesGuide
Gross Lease CAM Charges: When the Bill Conflicts [Guide]
Lease LanguageOverview
Modified Gross vs. Full Service Gross Lease: Key Differences
NNN LeasesOverview
NNN vs. Gross Lease: What Tenants Actually Pay [2026]
CAM OverchargesGuide
5 common modified gross lease overcharges (and how to catch them)

Explore Related Resources

Tenant TypeMedical OfficeTenant TypeLaw FirmLease ClauseBase Year Stop ClauseLease ClauseReconciliation Statement Deadline ClauseLease TypeModified Gross LeaseScenarioMy CAM reconciliation just went up 30% or more year over year

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Related Resources

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

Related Articles

  • CAM Exclusions in Gross Leases
  • Modified Gross vs. Full Service Gross Lease
  • NNN vs. Gross Lease Comparison

Frequently asked questions

Need to extract lease terms before your audit?

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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.