Commercial leases sit on a spectrum based on how operating costs — property taxes, insurance, maintenance, and building repairs — are split between landlord and tenant. On one end sits the gross lease, where the landlord covers nearly everything. On the other sits triple net (NNN), where the tenant covers nearly everything. Understanding where a specific lease falls on that spectrum is essential to comparing properties, since two buildings with identical rent can produce very different net income depending on the lease structure.
Gross Lease
In a gross lease, the tenant pays a flat rent, and the landlord is responsible for property taxes, insurance, and most or all maintenance and operating costs out of that rent. This structure is common in office buildings and some multi-tenant retail, where landlords want predictable, simplified billing for tenants.
For an investor, a gross lease means your net income is more exposed to rising operating costs over time — if property taxes or insurance premiums increase, that cost comes out of your return unless the lease includes some form of expense pass-through or escalation.
Modified Gross Lease
A modified gross lease splits the difference: the tenant typically pays a flat base rent plus some portion of operating expenses — often property taxes and insurance, sometimes a share of common area maintenance — while the landlord retains responsibility for the rest, particularly structural and major system repairs. Modified gross is common in multi-tenant office and some retail settings where a pure gross or pure NNN structure doesn’t fit the property type well.
Triple Net (NNN) Lease
Under a true NNN lease, the tenant pays property taxes, insurance, and maintenance, in addition to base rent — with the landlord typically retaining only roof and structure responsibility. This is the dominant structure for single-tenant net-lease investment properties: QSR ground leases, dollar store leases, and pharmacy leases most commonly use this format.
For an investor, NNN significantly reduces exposure to rising operating costs since the tenant absorbs them directly, which is a major reason net-lease real estate has become a popular passive-income vehicle for 1031 exchangers and retirement-stage investors.
Side-by-Side: Who Pays What
| Cost Category | Gross Lease | Modified Gross | NNN (Triple Net) |
|---|---|---|---|
| Property taxes | Landlord | Landlord or split | Tenant |
| Building insurance | Landlord | Landlord or split | Tenant |
| Common area maintenance | Landlord | Sometimes split | Tenant |
| Routine maintenance | Landlord | Landlord or split | Tenant |
| Structural repairs | Landlord | Landlord | Landlord (typically) |
For the full spectrum including absolute net lease structures — where even structural and roof responsibility shifts to the tenant — see our Absolute Net Lease vs. Triple Net comparison.
Why This Matters for Pricing and Underwriting
Lease structure directly affects how you should compare properties. A building advertised at a higher cap rate than a comparable NNN property might actually be a gross or modified gross lease — meaning your effective return is lower once you account for the operating costs you’ll be responsible for covering. Always confirm lease structure before comparing cap rates across listings; comparing a gross-lease cap rate directly against an NNN cap rate without adjusting for the cost difference is one of the more common underwriting mistakes we see from less experienced buyers.
Which Structure Is Right for You
- Passive, minimal-management investors (1031 exchangers, retirement-stage portfolios) generally prefer NNN or absolute net for the predictability and reduced exposure to rising costs.
- Investors comfortable with more active management, or those buying multi-tenant properties where a single NNN structure doesn’t fit every tenant, may find gross or modified gross leases more practical.
- Owner-users occupying their own building don’t face this choice in the same way, since they’re not leasing to a third party — but the same cost-allocation logic applies if they later lease out excess space.
This page is provided for general informational purposes and is not a substitute for professional legal review of any specific lease. Every property and lease is different — talk with Doug directly about your specific situation.
Frequently Asked Questions
Is NNN always better than a gross lease for investors? Not universally — NNN reduces your exposure to rising operating costs and requires less active management, which suits passive investors. Gross and modified gross leases can still make sense in multi-tenant settings or for investors who prefer more direct control over building operations.
How do I compare cap rates between an NNN property and a gross lease property? You need to adjust for the operating costs each lease structure leaves with the landlord. A higher cap rate on a gross lease property may not actually represent a better return once you account for the taxes, insurance, and maintenance you’d be responsible for covering.
What’s the difference between modified gross and NNN? Modified gross typically has the tenant paying base rent plus some expenses (often taxes and insurance), while the landlord retains structural and some maintenance responsibility. NNN shifts nearly all operating costs to the tenant, with the landlord typically retaining only roof and structure.
Which lease structure is most common for single-tenant retail properties? True NNN is the dominant structure for single-tenant retail, QSR, and pharmacy net-lease properties in the current market, largely because it’s the structure most investors specifically seek out for passive income.
Can a lease change structure over its term? It’s uncommon but not impossible — some leases include structural changes tied to renewal periods or specific triggers. Always read the full lease term-by-term rather than assuming the structure is static for the life of the agreement.