When a business owner signs their first commercial lease, the rent number is rarely the number they actually pay. We see it every month: a tenant excited about a $12 per square foot rate, only to discover there’s a second figure stacked on top of it. That second figure usually means they’re looking at a triple net lease.

If you’re leasing retail, office, or industrial space in Pennsylvania, understanding the triple net lease is one of the most useful things you can do before you sign. This guide breaks down what an NNN lease is, what you’ll actually pay, the common variations, and the traps worth knowing about.

What Is a Triple Net Lease?

A triple net lease is the most common structure in commercial real estate, especially in retail and single-tenant deals. The “net” refers to costs that pass through to the tenant on top of base rent.

A triple net lease (NNN) is a commercial lease where the tenant pays base rent plus the three “nets”: property taxes, insurance, and common area maintenance (CAM).

In a gross lease, the landlord covers those operating costs and bakes them into one rent figure. In an NNN lease, the landlord essentially passes the building’s running costs to the tenant. That’s why the base rent on an NNN deal often looks lower than a gross deal for comparable space, the operating costs simply live in a separate line item.

How a Triple Net Lease Works in Practice

Here’s the typical flow of an NNN lease from quote to monthly payment:

1. Base rent is quoted per square foot, per year. A 3,000 SF space at $15 PSF base rent is $45,000 annually, or $3,750 a month before the nets.
2. The three nets are estimated and added. Property taxes, building insurance, and CAM are projected for the year, divided by the building’s square footage, and charged as an additional PSF figure (often $3 to $7 PSF in our markets, depending on the property).
3. You pay monthly, then reconcile annually. The nets are usually estimated and billed monthly. At year-end, the landlord reconciles actual costs against what you paid, and you either get a credit or a bill for the difference.

So that “$15 PSF” space might really cost you $20 PSF all-in. The gap between quoted base rent and true occupancy cost is exactly why we tell tenants to ask for the NNN estimate in writing before they fall in love with a number.

NNN Lease vs. Gross Lease: Who Pays What

The takeaway: a low base rent on an NNN deal isn’t automatically a better value than a higher gross rent. You have to compare the all-in number.

Common Variations of the Net Lease

“Net lease” is a family of structures, not a single thing. The three you’ll run into most:

• Single net (N): Tenant pays base rent plus property taxes. The landlord keeps insurance and maintenance.
• Double net (NN): Tenant pays base rent plus taxes and insurance. The landlord typically retains responsibility for structural maintenance like the roof and foundation.
• Triple net (NNN): Tenant pays base rent plus taxes, insurance, and maintenance. In an absolute NNN (or “bondable”) lease, the tenant takes on essentially everything, including roof and structure, common in single-tenant net-lease investments.

What to Watch Out for Before You Sign

This is where our experience tends to save tenants money. A few things we always look at:

• Uncapped CAM. If common area maintenance has no annual cap, a single big repair or a management fee bump can spike your costs. We push for a cap on controllable CAM increases (often 3 to 5% per year).
• Vague “maintenance” language. Are you responsible for the HVAC unit? The roof? Get specifics in writing. An ambiguous clause can turn into a five-figure surprise.
• Audit rights. You should have the right to review the landlord’s books on the nets. Reconciliations aren’t always correct.
• The first-year estimate. Landlords sometimes quote a low NNN estimate to win the deal, then true it up later. Ask what last year’s actual nets were.

None of this is legal advice, lease terms vary, and you should always have a CRE attorney review the document. But knowing what to ask changes the conversation, and the rent.

Frequently Asked Questions About Triple Net Leases

What does NNN mean on a commercial lease?

NNN stands for “triple net,” meaning the tenant pays base rent plus the three nets: property taxes, building insurance, and common area maintenance. It’s the most common commercial lease structure in retail and single-tenant deals.

How much are NNN charges per square foot?

NNN charges vary widely by property, but in the PA/NJ/DE region they commonly run from about $3 to $7 per square foot per year on top of base rent. Always ask for the property’s actual prior-year figures rather than relying on a quoted estimate.

Is a triple net lease good for tenants?

It can be. NNN leases often carry lower base rent and more transparency about where costs go. The risk is that operating costs pass directly to you, so the protections you negotiate, like CAM caps and clear maintenance language, matter a great deal.

What’s the difference between NNN and gross lease?

In a gross lease, the landlord pays operating costs and charges one all-in rent. In an NNN lease, those costs pass through to the tenant as a separate charge on top of base rent. A low NNN base rent isn’t always cheaper than a higher gross rent once you total everything.

Can you negotiate NNN charges?

Yes. While taxes and insurance are largely fixed, you can negotiate a cap on annual CAM increases, clarify maintenance responsibilities, and secure audit rights. These terms are where a tenant rep broker typically earns their keep.

Need the Right Commercial Space?

If you’re searching for office, industrial, retail, or flex space in PA, NJ, or DE, we can help you find the right fit, and negotiate the lease terms that protect your business. SCG works with tenants every week across the region.

Call 215.995.0191 or request a tenant consultation.