What Does NNN (Triple Net) Actually Mean?

Let’s start with the basics. The “triple net” in NNN lease refers to three categories of expenses:

1. Property taxes (first “net”)
2. Insurance (second “net”)
3. Maintenance and repairs (third “net”)

In a traditional NNN lease, the tenant pays all three on top of their base rent. So if the lease says $15 per square foot NNN, that $15 is just the base rent. The tenant also pays their pro-rata share of taxes, insurance, and CAM (common area maintenance).
Compare that to a residential lease where you, the landlord, pay the property tax bill, the insurance premium, and fix the roof when it leaks. In commercial, the tenant handles it.

The Three “Nets” Broken Down

Net 1: Property Taxes

The tenant reimburses you for property taxes. In most NNN leases, you (the landlord) still receive the tax bill and pay it, but the tenant reimburses you monthly based on their proportionate share of the building. If they occupy 5,000 square feet in a 20,000-square-foot building, they pay 25% of the annual tax bill, usually broken into monthly installments.

Net 2: Insurance

Same deal. You carry the building insurance policy, but the tenant reimburses you for their share. This typically includes property insurance and liability coverage. The tenant also carries their own separate business liability insurance – that’s on them, not you.

Net 3: Maintenance (CAM)

CAM stands for Common Area Maintenance. This covers things like parking lot repairs, landscaping, roof repairs, HVAC maintenance, exterior painting, and snow removal. The tenant pays their pro-rata share based on square footage.
In a true NNN lease, the tenant is responsible for almost everything except major structural repairs (and even that can be negotiated). Some landlords include a reserve for capital expenditures that tenants fund over time.

Who Pays What: Tenant Responsibilities vs. Landlord Responsibilities

Here’s where it gets practical. Let’s walk through a real office building I own to show you how this breaks down.

Real Example: 10,000 SF Office Building

Base rent: $12/SF NNN
Annual property taxes: $18,000
Annual insurance: $4,500
Annual CAM: $15,000
Tenant pays:

• Base rent: $120,000/year ($10,000/month)
• Property taxes: $18,000/year ($1,500/month)
• Insurance: $4,500/year ($375/month)
• CAM: $15,000/year ($1,250/month)

Total tenant obligation: $157,500/year ($13,125/month)
Landlord receives:

• $10,000/month base rent (this is your actual cash flow before debt service)
• $3,125/month in NNN reimbursements (which you use to pay taxes, insurance, and CAM expenses)

Notice the landlord isn’t pocketing that extra $3,125. It’s pass-through income that covers your operating expenses. The base rent is what you actually keep.

What the Landlord Still Covers

Even in a true NNN lease, the landlord usually retains responsibility for:

• Structural repairs: Foundation, load-bearing walls, major structural issues
• Roof replacement: Major roof replacement (though some leases pass this to tenants)
• Property management: If you hire a property manager, that’s typically on you
• Debt service: Your mortgage payment is always your responsibility
• Vacancy costs: When the building is vacant, you pay everything

The goal with NNN is to minimize operating expense surprises. You’re not getting calls about a leaky faucet or a broken HVAC unit. The tenant handles it or pays for it directly.

How NNN Leases Impact Your Returns (Real Numbers)

Let’s talk about why NNN leases are attractive from an investment standpoint. The short answer: predictability and cash flow stability.

Example Deal Comparison: NNN vs. Gross Lease

I’ll use two hypothetical office buildings, both 10,000 SF, both purchased at a 7% cap rate.
Building A: NNN Lease

• Purchase price: $1,500,000
• Base rent: $12/SF = $120,000/year
• NNN expenses: $3.75/SF = $37,500/year (taxes, insurance, CAM)
• Landlord receives: $120,000 base rent + $37,500 reimbursements
• Landlord pays out: $37,500 in actual expenses
• Net Operating Income (NOI): $120,000
• Cap rate: $120,000 / $1,500,000 = 8%

Building B: Gross Lease (Full Service)

• Purchase price: $1,500,000
• Gross rent: $15.75/SF = $157,500/year
• Landlord receives: $157,500
• Landlord pays: $37,500 in taxes, insurance, CAM
• Net Operating Income (NOI): $120,000
• Cap rate: $120,000 / $1,500,000 = 8%

At first glance, these look identical. Same NOI, same cap rate. But here’s where NNN wins:
Operating Expense Risk
In Building A (NNN), if property taxes increase 10% next year, your NOI doesn’t change. The tenant pays the increase. In Building B (gross lease), you absorb the entire increase, and your NOI drops by $1,800.
Inflation Protection
Over a 10-year hold, taxes and insurance tend to increase 3-4% annually. In an NNN lease, those increases flow to the tenant. In a gross lease, your NOI erodes unless you have built-in rent escalations that keep pace (most don’t).
Predictable Cash Flow
With NNN, your monthly income is almost entirely base rent. You know exactly what you’re netting after expenses because the expenses are reimbursed. With gross leases, you’re constantly managing fluctuating costs.

Real Example: My First Office Building

In 2021, I bought my first office building for $825,000 (listed at $1.6M). It was a 12,000 SF building with three tenants, all on NNN leases.
Year 1 financials:

• Base rent: $108,000/year
• NNN reimbursements: $42,000/year
• Total rent collected: $150,000
• Actual operating expenses: $42,000
• NOI: $108,000
• Debt service: $60,000 (20-year amortization, 4.5% interest)
• Cash flow before taxes: $48,000/year

Year 3 update:
Property taxes increased 8% due to a county reassessment. Insurance went up 15% thanks to Florida’s insurance market. Total operating expense increase: about $4,500/year.
My cash flow? Unchanged. The tenants absorbed the entire increase because of the NNN structure. If those had been gross leases, I would have eaten that $4,500, reducing my annual cash flow to $43,500.
That’s the magic of NNN. Your returns stay stable even when expenses don’t.

Common Gotchas and What to Watch For

NNN leases aren’t foolproof. Here are the things that can bite you if you’re not careful.

1. Not All NNN Leases Are Created Equal

Some leases are labeled “NNN” but have carve-outs. I’ve seen leases where the tenant pays taxes and insurance, but the landlord is responsible for the roof and HVAC. That’s not a true NNN – it’s a modified net lease.
Always read the lease. Look for phrases like “landlord responsible for structural repairs” or “landlord to maintain roof and exterior.” Those shift costs back to you.

2. CAM Reconciliation Nightmares

CAM is usually estimated at the beginning of the year and paid monthly. At year-end, you reconcile actual expenses and either bill the tenant for a shortfall or refund an overage.
Here’s the problem: tenants hate surprise bills. If you underestimated CAM by $5,000 and send them a reconciliation bill in January, they’re going to push back. I learned this the hard way in year two. Now I overestimate CAM slightly and refund the difference. Tenants are much happier getting a check than writing one.

3. Capital Expenditures vs. Repairs

Most NNN leases say tenants pay for “repairs and maintenance,” but capital expenditures (CapEx) are a gray area. Is a roof replacement a repair or CapEx? What about replacing an HVAC system?
Legally, major capital improvements are usually the landlord’s responsibility unless the lease explicitly passes them through. This is why I always budget 5-10% of rent for CapEx reserves, even in NNN properties. You will eventually replace a roof or HVAC, and if the lease doesn’t pass it to tenants, that’s on you.

4. Single-Tenant NNN Risk

Single-tenant NNN properties (think Walgreens, Dollar General) are incredibly passive. One tenant, one lease, zero management. But if that tenant leaves, you’re 100% vacant. And re-tenanting a single-use building (like a former bank or pharmacy) can take 12-18 months.
Multi-tenant NNN spreads that risk. If one tenant out of five leaves, you’re still collecting 80% of your income while you backfill.

5. Expense Audits

Some tenants have the right to audit your CAM expenses. This is more common with sophisticated tenants (medical groups, law firms, corporate tenants). If you’re sloppy with bookkeeping or you’ve been passing through personal expenses (don’t do this), an audit can get ugly fast.
Keep clean books. Only pass through legitimate building expenses. Use a separate account for CAM funds so there’s no commingling.

NNN vs. Gross vs. Modified Gross: How They Compare

Let’s put the three main lease structures side by side so you can see the differences.

Lease Structure Comparison

Triple Net (NNN)

• Tenant pays: Base rent + taxes + insurance + CAM
• Landlord pays: Debt service, major structural repairs, property management
• Who takes expense risk: Tenant
• Cash flow predictability: High
• Management intensity: Low
• Common in: Office, industrial, retail (multi-tenant or single-tenant)

Gross Lease (Full Service)

• Tenant pays: All-inclusive rent
• Landlord pays: Taxes, insurance, CAM, utilities, janitorial
• Who takes expense risk: Landlord
• Cash flow predictability: Medium (depends on escalations)
• Management intensity: High
• Common in: Class A office buildings, some retail

Modified Gross

• Tenant pays: Base rent + some expenses (varies by lease)
• Landlord pays: Remaining expenses
• Who takes expense risk: Split between landlord and tenant
• Cash flow predictability: Medium
• Management intensity: Medium
• Common in: Office, flex space, some industrial

When Each Lease Type Makes Sense

Choose NNN if:

• You want passive, predictable income
• You’re investing in multi-tenant office, industrial, or retail
• You want tenants to absorb operating expense increases
• You prefer minimal landlord responsibilities

Choose Gross if:

• You’re competing for Class A tenants who expect full-service leases
• You can negotiate strong annual rent escalations (3-4%)
• You want to control building operations and vendor relationships
• You’re in a market where gross leases are standard

Choose Modified Gross if:

• You want to split risk with tenants
• You’re in a competitive market and need flexibility
• You want some expense pass-throughs but not full NNN
• You’re dealing with smaller tenants who prefer simplicity

In my portfolio, I stick with NNN for almost everything. It aligns incentives – tenants care about keeping costs down because they’re paying them. And I sleep better knowing a surprise tax increase or insurance spike won’t blow up my cash flow.

Real-World Example: Two Properties, Two Structures

Let me show you how this plays out with two buildings I’ve owned.

Property 1: 8,000 SF Industrial Warehouse (NNN Lease)

Tenant: Manufacturing company, 7-year lease
Base rent: $6.50/SF = $52,000/year
NNN expenses: $2.25/SF = $18,000/year
Operating expenses (actual):

• Property taxes: $12,000
• Insurance: $3,200
• CAM (minimal – just parking lot seal coating and landscaping): $2,800
• Total: $18,000

Landlord cash flow:

• NOI: $52,000
• Debt service: $32,000
• Annual cash flow: $20,000

When the property tax bill jumped from $12,000 to $13,500 after reassessment, my cash flow stayed at $20,000. The tenant absorbed the $1,500 increase via their monthly NNN payment.

Property 2: 6,000 SF Office Building (Modified Gross Lease)

This was an older building with professional tenants (therapists, consultants, small law firm). The market standard was modified gross – tenants paid base rent, and I covered everything except their pro-rata share of increases over a base year.
Base rent: $16/SF = $96,000/year
Operating expenses (Year 1 baseline):

• Property taxes: $11,000
• Insurance: $4,500
• CAM: $14,000
• Utilities: $8,000
• Janitorial: $6,000
• Total: $43,500

Year 1 NOI: $96,000 – $43,500 = $52,500
Year 3 expenses:

• Property taxes: $12,500 (up $1,500)
• Insurance: $6,200 (up $1,700)
• CAM: $15,500 (up $1,500)
• Utilities: $9,200 (up $1,200)
• Janitorial: $6,000 (flat)
• Total: $49,400

The lease said tenants paid their share of increases above the base year. Total increase: $5,900. With three tenants, each paid about $2,000 extra. But I still ate a portion because the base year was locked.
Year 3 NOI: $96,000 + $5,900 (expense pass-through) – $49,400 = $52,500
Notice my NOI stayed flat, but only because I successfully passed through most of the expense increases. If I hadn’t negotiated that expense stop, my NOI would have dropped to $46,600. That’s a 11% decline in cash flow just from operating expense inflation.
I sold that building in 2024 and rolled the proceeds into a fully NNN industrial property. Lesson learned: life’s too short to manage gross leases.

FAQ: NNN Leases Explained

What does NNN mean in commercial real estate?

NNN stands for “triple net lease,” a lease structure where the tenant pays three categories of expenses on top of base rent: property taxes (first net), insurance (second net), and maintenance/CAM (third net). The landlord receives predictable base rent while the tenant covers most operating expenses.

Who pays property taxes in a triple net lease?

The tenant pays property taxes in a triple net lease, typically as a monthly reimbursement to the landlord based on their proportionate share of the building. The landlord usually receives the tax bill, pays it, and then collects reimbursement from the tenant.

Is a NNN lease better for landlords or tenants?

NNN leases generally favor landlords because they shift operating expense risk to the tenant and provide predictable cash flow. However, tenants benefit from transparency (they see exactly what they’re paying for) and control over maintenance decisions. Both parties win when the lease is structured fairly.

What is the difference between NNN and gross lease?

In a triple net (NNN) lease, the tenant pays base rent plus taxes, insurance, and CAM separately. In a gross lease, the tenant pays one all-inclusive rent amount, and the landlord covers all operating expenses. NNN provides landlords with more predictable income; gross leases provide tenants with simpler, fixed costs.

What expenses are NOT covered in a NNN lease?

Even in a triple net lease, landlords typically remain responsible for major structural repairs, roof replacement (in some leases), property management fees, debt service (mortgage payments), and vacancy costs. Capital expenditures like HVAC replacement are often a gray area and depend on lease language.

Are NNN leases more valuable than gross leases?

NNN properties often trade at lower cap rates (higher valuations) than comparable gross lease properties because they offer more predictable cash flow and lower landlord risk. Investors are willing to pay a premium for the stability and passive income that NNN leases provide.

Conclusion: Why NNN Leases Are Ideal for Most Commercial Investors

If you’re coming from residential real estate or just getting started in commercial, NNN leases are your friend. They reduce management headaches, protect your cash flow from expense inflation, and create a truly passive income stream.
Yes, you’ll still have responsibilities. Yes, you need to budget for capital expenditures. And yes, you need to read the lease carefully because not all NNN leases are created equal.
But once you understand the structure, NNN properties become some of the most attractive investments in commercial real estate. Predictable income, minimal surprises, and tenants who are incentivized to keep costs low because they’re the ones paying them.
In my portfolio, I’ve shifted almost entirely to NNN industrial and office properties for exactly these reasons. The cash flow is stable, the management is light, and I can scale without drowning in operational complexity.
If you’re ready to buy your first commercial building, look for NNN deals. You’ll thank yourself later.

Ready to Buy Your First Commercial Property?

For aspiring investors: If you want hands-on help buying your first commercial building, check out our One Deal Blueprint. We’ll walk you through deal sourcing, underwriting, financing, and closing your first NNN property.
For passive investors: If you prefer to invest passively in commercial real estate without the operational work, download our free guide to passive CRE investing to learn how equity partnerships work and what returns to expect.

About the Author

John Heisler spent 10+ years as a critical care physician assistant before building a $30M+ commercial real estate portfolio. He runs CRE Playbook, helping investors buy their first commercial building, and Township Properties, a commercial real estate acquisition and investment firm.