What is the main difference between a NNN lease and a gross lease?

Under a gross lease, the tenant pays one fixed rent amount and the landlord covers all operating expenses—property taxes, building insurance, and all common area maintenance. Under a NNN (triple net) lease, the tenant pays base rent plus their pro-rata share of property taxes, building insurance, and CAM expenses, billed through monthly estimates with annual reconciliation. The financial difference: in year one, a NNN lease at $18/SF base with $8/SF in operating expenses has the same $26/SF all-in cost as a $26/SF gross lease. But in year five, if operating expenses grew at 4%/year, the NNN tenant's all-in cost is $27.79/SF while the gross tenant's cost depends on scheduled escalations—the key is who takes the risk of that increase.

Is a NNN lease more expensive than a gross lease?

Not necessarily in year one—landlords price gross leases to include operating cost estimates plus a risk premium. NNN base rents are lower because the tenant bears the expense risk. The difference is who absorbs cost escalation. Over a 5–10 year lease term, if operating expenses rise faster than scheduled gross lease escalations, NNN becomes more expensive for the tenant. If operating expenses rise slower than escalations built into the gross lease, NNN is cheaper. In current market conditions (2025–2026), with insurance and property tax increases running 15–40% in some markets, NNN tenants have faced significant cost increases compared to what gross lease tenants locked in at.

Do NNN leases have expense caps?

Most modern NNN leases cap controllable expense increases at 3–5% per year. Controllable expenses include CAM items the landlord can influence through management decisions: landscaping, janitorial, parking lot maintenance, security. Non-controllable expenses—property taxes, insurance, utilities—are typically uncapped and pass through at actual cost. A lease with a 4% controllable cap still exposes tenants to full tax and insurance increases, which have been running well above 4% in most markets since 2022. The distinction between controllable and non-controllable is negotiated in the lease and can be a significant point of contention.

What CAM expenses does a NNN tenant pay?

Under a NNN lease, tenants typically pay their pro-rata share of: property taxes, building insurance, janitorial (common areas), landscaping, parking lot maintenance and resurfacing, exterior lighting, common area utilities, trash removal, snow removal, security, and property management fees (usually 4–6% of gross revenues). What's typically excluded (if negotiated): capital expenditures or items amortized over useful life, costs benefiting other tenants, leasing commissions, debt service, and depreciation. The exact inclusions and exclusions vary by lease. See our full guide to what is included in CAM expenses for the complete breakdown.

Which is better for a NNN property investor: NNN or gross leases?

NNN leases are almost universally preferred by institutional NNN property investors because they provide predictable base rent income with full operating expense recovery. The investor doesn't absorb property tax increases, insurance premium spikes, or maintenance cost inflation. NNN properties with creditworthy single tenants (investment-grade retailers, pharmacies, banks) trade at premium valuations precisely because the income stream is clean and predictable. Gross lease properties require active management of operating cost risk and are appropriate for investors comfortable managing that exposure or in markets where gross leases are the norm and can be priced accordingly.

NNN Lease vs Gross Lease: 5-Year Financial Comparison

By Angel Campa·Founder, CapVeriUpdated April 24, 2026

Quick Answer

NNN lease: tenant pays base rent + taxes + insurance + CAM. Gross lease: tenant pays one inclusive rent, landlord covers everything. Same all-in cost in year one; the difference is who absorbs expense increases over the lease term. NNN shifts that risk to tenants; gross keeps it with the landlord.

The comparison isn't about which is "cheaper"—it's about who takes the risk of rising operating costs. Here's the 5-year math on both structures.

Year-One Economics: Why They're Often Equivalent

Landlords price gross leases to recover the same operating costs they'd bill under NNN—plus a risk premium for taking on the expense variability. In year one, the all-in cost to the tenant is usually similar under either structure.

Building: 6,500 SF retail space

Current operating expenses:

Property taxes: $3.10/SF
Building insurance: $1.60/SF
CAM (maintenance, landscaping, janitorial, mgmt): $4.30/SF
Total: $9.00/SF

NNN structure: Base rent $17.50/SF + $9.00/SF NNN expenses = $26.50/SF all-in Gross structure: Rent $27.00/SF (landlord's $17.50/SF net + $9.00/SF cost recovery + $0.50/SF risk premium)

Year one all-in: NNN is $26.50/SF, gross is $27.00/SF. The $0.50/SF premium reflects the landlord's cost of absorbing expense risk.

The 5-Year Financial Model

Assumptions:

Controllable CAM expenses grow 4%/year
Property taxes grow 6%/year (reflecting Sun Belt reassessment pressure)
Insurance grows 10%/year (reflecting current market conditions)
Gross lease has 3% annual fixed escalations

Year	NNN Base Rent	NNN Expenses	NNN All-In	Gross Rent	Difference
1	$17.50	$9.00	$26.50	$27.00	Gross +$0.50
2	$17.50	$9.46	$26.96	$27.81	Gross +$0.85
3	$17.50	$9.97	$27.47	$28.65	Gross +$1.18
4	$17.50	$10.51	$28.01	$29.51	Gross +$1.50
5	$17.50	$11.09	$28.59	$30.40	Gross +$1.81

5-year cumulative all-in cost:

NNN: $137.53/SF ($893,945 for 6,500 SF)
Gross: $143.37/SF ($931,905 for 6,500 SF)

In this model, the gross lease tenant pays about $38,000 more over 5 years. The breakeven point where NNN becomes more expensive than gross is roughly when operating expense increases outpace the rent escalation built into the gross lease.

What changes the result: If insurance spikes 40% in year two (which happened to many Sun Belt properties in 2024), the NNN tenant immediately absorbs $0.64/SF more. At 10%/year insurance growth the model above captures that trajectory. At 20%/year insurance growth, NNN crosses above the gross structure in year three.

Use the NOI impact calculator to model these scenarios with your actual property data.

NNN Lease: What the Tenant Actually Pays

Under NNN, the tenant pays:

Monthly: Base rent + monthly CAM estimate

Annually: Year-end CAM true-up if actual expenses exceeded estimates, or a credit if estimates were high

The reconciliation cycle: landlord estimates annual operating expenses, bills monthly estimates to each tenant based on pro-rata share, then reconciles actual costs at year end. Tenants with audit rights can request documentation of the actual costs.

What's included in the NNN expense pool varies by lease—see what is included in CAM expenses for the full breakdown.

Gross Lease: What the Landlord Actually Manages

Under a gross lease, the landlord:

Sets rent at a level that covers expected operating costs plus return on investment
Pays all operating expenses directly—no billing or reconciliation to tenants
Absorbs all cost increases without a pass-through mechanism
Adjusts rent at renewal to reflect updated operating cost assumptions

The risk exposure is real. A landlord with a 10-year gross lease signed in 2018 at $26/SF in a coastal market has been absorbing operating cost increases for 7+ years—including the insurance spike of 2022–2024 that hit Florida and Texas commercial properties hardest. At renewal in 2028, the landlord will need to price in both current operating costs and a forward-looking risk premium.

NNN vs Gross: The Audit Rights Difference

NNN tenants typically have lease-granted audit rights—the right to review the landlord's operating expense records and challenge incorrect billings. Gross lease tenants have no such right because they're not being billed for operating expenses separately.

This audit right matters because CAM overbilling errors are common even in well-managed portfolios. Common errors include: applying gross-up incorrectly, including non-recoverable capital costs in the CAM pool, charging management fees on excluded expense categories, and misallocating multi-property shared services.

Which Structure Wins: Landlord vs Tenant Perspective

Landlord prefers NNN when:

Operating cost trajectory is uncertain or rising
The portfolio is institutional-grade and investors expect full expense recovery
The tenant is creditworthy and can absorb cost pass-throughs
Lease terms are long (7–15 years) where inflation risk is significant

Landlord prefers gross when:

Market norms favor it (office, small suites)
Operating costs are stable and predictable
The landlord wants to avoid the administrative overhead of reconciliation
The premium built into gross rent exceeds expected cost increases

Tenant prefers NNN when:

Operating expense inflation is expected to be low
The tenant has strong audit rights and wants to verify charges
Base rent is significantly lower than equivalent gross options

Tenant prefers gross when:

Cost certainty is a priority (budget planning, lease accounting under ASC 842)
Insurance and tax markets are volatile (current conditions favor gross for tenants)
The occupancy is short-term and reconciliation complexity isn't worth it

The Single-Tenant NNN Investment Property Model

NNN leases on single-tenant freestanding properties (pharmacies, fast food, banks, auto parts) represent the purest form of NNN investing. The tenant operates as an "absolute NNN" or "bondable NNN" tenant—paying everything including structural maintenance. See NNN investment properties CAM analysis for how CAM recovery rates affect valuation in this asset class.

For a complete picture of all lease structures, see commercial lease types guide and gross lease vs net lease. The commercial lease rent structures guide shows worked examples for every structure type.