NNN vs. Gross Lease: A Warehouse Tenant's Guide for Palm Beach County

When you're shopping for warehouse space in Palm Beach County, the quoted base rent is only part of the story. Two spaces with identical asking rents can carry total monthly costs that differ by 30% or more, depending on the lease structure. Understanding whether you're looking at a triple net (NNN), gross, or modified gross lease changes how you evaluate every offer you receive.

This guide explains each lease type in plain terms, shows you what the numbers look like in a real Palm Beach County context, and tells you what to watch for when you're comparing spaces in Riviera Beach, Lake Worth, Boynton Beach, or anywhere else in the county.

What a Triple Net (NNN) Lease Actually Means

"NNN" stands for three nets: property taxes, property insurance, and common area maintenance (CAM). In a triple net lease, the tenant pays the landlord a base rent plus their proportionate share of all three of those expense categories.

This is the dominant lease structure for industrial and warehouse space in South Florida, and Palm Beach County is no exception. According to NAIOP, the Commercial Real Estate Development Association, NNN leases are standard practice for single-tenant and multi-tenant industrial buildings nationwide because they give landlords predictable net income while passing operating cost variability to tenants.

Here is what each "net" covers in practice:

Property taxes. Palm Beach County property taxes are calculated using the county property appraiser's assessed value multiplied by the applicable millage rate. As of 2026, the total millage rate for unincorporated Palm Beach County is approximately 18–22 mills depending on the taxing district, according to the Palm Beach County Property Appraiser's office. On a 10,000 SF industrial building assessed at $1.2 million, that can translate to $21,600–$26,400 per year in taxes—or roughly $2.16–$2.64 per SF per year that flows through to the tenant in a NNN lease.

Property insurance. Florida property insurance has increased substantially since Hurricane Ian (2022) reshaped carrier appetite across the state. According to the Florida Office of Insurance Regulation, commercial property premiums statewide rose an average of 33% between 2022 and 2024. Industrial buildings in Palm Beach County currently carry insurance costs that landlords typically pass through at $0.50–$1.50 per SF per year, depending on age, construction type, and location relative to flood zones.

Common area maintenance (CAM). CAM covers landscaping, parking lot maintenance, roof repairs on common areas, exterior lighting, and property management fees for multi-tenant buildings. According to the Institute of Real Estate Management (IREM), CAM expense control is one of the highest-impact cost centers for property owners, with well-managed multi-tenant industrial properties typically holding CAM costs in the $1.00–$2.50 per SF per year range. In a single-tenant standalone warehouse, CAM is often minimal—primarily exterior upkeep and management fees.

The Total NNN Cost Formula

Your true annual cost in a NNN lease is:

Total annual cost = (Base rent/SF × SF) + (Taxes/SF × SF) + (Insurance/SF × SF) + (CAM/SF × SF)

On a 5,000 SF warehouse in Palm Beach County, with a base rent of $16.00/SF NNN and combined expenses of $3.50/SF, your all-in cost runs $19.50/SF per year—or $97,500 annually ($8,125/month). If you only budgeted against the $16 base, you're off by nearly 22%.

What a Gross Lease Means (and Why It's Rare in Industrial)

In a gross lease (sometimes called a full-service lease), the landlord quotes one number that includes all operating expenses. You pay that number each month; the landlord covers taxes, insurance, and maintenance out of their pocket.

Gross leases are common in office buildings. They are rare in the Palm Beach County industrial market. When you do see them—typically in older, owner-occupied buildings being converted to rental—the base rate already has expenses baked in. A space that would lease at $16 NNN might be offered at $20–$21 gross to cover the same expenses.

The advantage of a gross lease is simplicity and cost certainty. The disadvantage is that you lose visibility into actual expense performance. If the landlord manages expenses well and property taxes decrease, you don't benefit. If they're inefficient, you're still paying a fixed rate.

Modified Gross Leases: The Middle Ground

A modified gross (or "modified net") lease splits the expense responsibility in a negotiated way. Common structures include:

• Tenant pays base rent + utilities; landlord covers taxes, insurance, and CAM
• Tenant pays base rent + CAM; landlord covers taxes and insurance
• Tenant pays base rent + taxes and insurance; landlord covers CAM (typical in some older industrial parks)

Modified gross leases are more common in flex spaces and smaller industrial suites in Palm Beach County. They allow for negotiation around which expenses a tenant is willing to absorb in exchange for a lower base rent. Understanding what's included in "modified gross" on a specific deal requires reading the lease language carefully—the label doesn't tell you much on its own.

Side-by-Side Cost Comparison: Three Lease Structures on the Same Space

The table below illustrates how three lease structures compare on a hypothetical 8,000 SF warehouse in Boynton Beach, where current market base rents for NNN industrial run approximately $15–$17/SF/year (see current market data at https://palmbeachwarehouses.com/blog/warehouse-space-cost-palm-beach-county/).

In this example, the modified gross offer—despite a higher base rent than the NNN—is the lowest true cost. This is exactly why you cannot evaluate warehouse offers by base rent alone.

Note: These figures are illustrative ranges based on current Palm Beach County market conditions. Actual expenses vary by property, location, and landlord. Always request a full expense reconciliation from the landlord before signing.

What Palm Beach County Tenants Get Wrong About NNN Leases

After working with tenants across the county—from Riviera Beach industrial corridors to the business parks off Lantana Road—a few misunderstandings come up repeatedly.

1. Assuming the expense estimate is the actual expense

Landlords provide an estimated expense figure when quoting NNN space. At year-end, they reconcile actual expenses against what you've paid. If actual costs exceeded estimates, you'll receive a reconciliation bill. If they came in under, you get a credit.

Request the last two to three years of actual expense reconciliation statements before you sign. This shows you whether the landlord's estimates have historically been accurate or consistently low.

2. Not reading what's included in CAM

CAM definitions vary by lease. Some landlords include capital expenditures (like roof replacement) in CAM recoveries; others don't. Ask specifically: are capital improvements excluded from CAM? What's the cap on CAM increases year-over-year? A 5% annual CAM cap is a reasonable negotiating ask in the current market. Learn more about structuring these protections in https://palmbeachwarehouses.com/blog/warehouse-lease-negotiation-palm-beach-county/.

3. Ignoring Florida's flood insurance exposure

Palm Beach County has significant FEMA flood zone exposure, particularly in coastal and low-elevation industrial areas. If the property sits in a Special Flood Hazard Area (SFHA), the landlord's property insurance may require a separate flood policy. That cost typically passes through to tenants in a NNN lease. Check the FEMA Flood Map Service Center at msc.fema.gov before you sign—a property in Zone AE will carry higher insurance passthroughs than one in Zone X.

4. Not accounting for utilities separately

NNN, gross, and modified gross leases almost never include electricity, gas, or water. Those are always paid directly by the tenant in industrial leases. For warehouses with heavy electrical demand (cold storage, manufacturing, EV charging), utility costs can rival base rent in total monthly expense.

How to Compare Offers Accurately

When you receive proposals on multiple warehouse spaces, use this process to put them on equal footing:

1. Ask for the expense breakdown in writing. Get the current-year estimated taxes, insurance, and CAM per SF from each landlord.

2. Add all-in cost. Base rent + all expense passthroughs + estimated utilities for your operation.

3. Request the last two years of expense reconciliations. This tells you whether the landlord runs a tight operation or consistently underestimates.

4. Identify cap structures. Does the lease cap annual CAM increases? Does it exclude certain capital costs from recovery?

5. Check the expense base year. In NNN leases with a base year structure, you pay a fixed share of expenses up to the base year amount, and increases above that threshold. The base year matters as much as the rate.

6. Factor lease term. A lower total cost in year one on a 3-year lease may cost more over the term than a slightly higher rate with a 5-year structure and fixed annual bumps, depending on how inflation and operating costs move.

What's Happening with NNN Expenses in Palm Beach County in 2026

Two trends are directly affecting the expense side of NNN leases in 2026.

Property insurance costs are elevated but stabilizing. After the post-Ian spike, several carriers have returned to the Florida market, according to the Florida Department of Financial Services. While premiums haven't returned to 2021 levels, the rate of increase has slowed. Tenants signing new NNN leases in 2026 should push for a cap on insurance reconciliation increases.

Property values—and therefore property taxes—have increased. Palm Beach County property values rose through 2023–2025 driven by migration inflows and industrial demand. Higher assessed values mean higher property tax passthroughs to NNN tenants. The Palm Beach County Property Appraiser reassesses values annually; properties that traded in the last 24 months are likely assessed close to purchase price, which means higher tax bills than older long-term holds.

These two factors are the main reason total NNN occupancy costs are running higher in 2026 than in 2019 or 2020—even where base rents have plateaued.

Frequently Asked Questions

Is NNN always more expensive than a gross lease for the same space? Not necessarily. Landlords price gross leases to cover their expected expenses plus a margin. If their actual expense performance is better than what's baked into the gross rate, the NNN option can come out cheaper over the lease term. The key is getting actual historical expense data, not just trusting the quoted rates.

Can I negotiate NNN expense caps in Palm Beach County industrial leases? Yes, and you should. Annual CAM increase caps of 3–5% are achievable in negotiations, as are exclusions for certain capital items (roof, HVAC replacement). The landlord's willingness to cap expenses often depends on how competitive the space is and how long it's been vacant.

What does "plus utilities" mean in a warehouse lease? It means electricity, gas, water, and trash are not included in any part of the quoted rent. You contract directly with the utility provider and pay separately. This applies in NNN, gross, and modified gross structures almost universally in the industrial market.

How do I verify a landlord's expense estimate is accurate? Request two to three years of actual expense reconciliation statements—the annual accounting showing what tenants were charged versus what they paid in estimated form. A pattern of reconciliation bills means the landlord consistently underestimates. A pattern of credits means they estimate conservatively, which favors the tenant.

What's the difference between a NNN lease and an absolute net lease? An absolute net lease (sometimes called a "bondable" lease) goes further than NNN by also requiring the tenant to cover structural repairs and roof replacements. These are more common in single-tenant net-lease retail than in warehouse, but they do appear in sale-leaseback transactions. Read any "absolute" or "bondable" language carefully before signing.

Bottom Line

In Palm Beach County's industrial market, the vast majority of warehouse leases are structured as NNN. That's not inherently bad for tenants—but it means the quoted base rent is only the starting point. Before you compare spaces or sign anything, build out your all-in cost model: base rent plus every expense passthrough plus utilities. Then verify those numbers against actual historical data.

See current availabilities at https://palmbeachwarehouses.com or request a space search.

Zach Thomas is a licensed Florida real estate sales associate at Cornerstone Realty. The information in this post is educational and based on publicly available data and general market knowledge. It does not constitute legal or financial advice. Rates and market conditions change; verify current figures with a licensed attorney and real estate professional before signing any lease.