What Is a Triple Net (NNN) Lease? A Complete Guide for Charleston Business Owner

By: |Published on: Jul 20, 2026|Categories: Articles|

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If you’re searching for commercial space in Charleston, SC, chances are you’ve come across the term “Triple Net (NNN) Lease.” But what does it actually mean—and how can it impact your business?

Whether you’re opening your first location, expanding your company, or relocating, understanding a Triple Net lease is essential before signing any commercial lease agreement.

What Is a Triple Net (NNN) Lease?

A Triple Net (NNN) lease is one of the most common types of commercial leases. In addition to paying base rent, the tenant is responsible for three additional operating expenses:

  • Property Taxes
  • Property Insurance
  • Common Area Maintenance (CAM)

These expenses are referred to as the “three nets,” which is where the term Triple Net (NNN) comes from.

What Does a Tenant Pay in an NNN Lease?

With a Triple Net lease, your monthly payment is typically made up of:

  • Base Rent – The agreed-upon rental rate for the space.
  • Property Taxes – Your share of the annual real estate taxes.
  • Property Insurance – Your portion of the building’s insurance costs.
  • Common Area Maintenance (CAM) – Costs associated with maintaining shared areas of the property.

CAM expenses may include:

  • Landscaping
  • Parking lot maintenance
  • Sidewalks
  • Exterior lighting
  • Roof and building maintenance
  • HVAC servicing (depending on the lease)
  • Trash removal
  • Property management fees
  • Snow or storm cleanup (where applicable)

Because these costs can fluctuate from year to year, it’s important to understand how they’re calculated before signing a lease.

What Is CAM?

One of the most frequently asked questions in commercial real estate is, “What is CAM?”

CAM (Common Area Maintenance) refers to the costs of maintaining the shared areas of a commercial property.

Examples include:

  • Parking lots
  • Sidewalks
  • Landscaping
  • Building exteriors
  • Common hallways
  • Shared lighting
  • Security systems

Many Charleston shopping centers, office parks, and industrial developments charge CAM fees in addition to base rent.

Triple Net (NNN) Lease vs. Gross Lease

Understanding the difference between these lease structures can help you compare properties more accurately.

Triple Net (NNN) Lease Gross Lease
Lower base rent Higher base rent
Tenant pays taxes, insurance & CAM Landlord generally covers operating expenses
Monthly costs may fluctuate More predictable monthly payments
Most common for retail, industrial & office properties Often used in smaller office buildings

A lower rental rate doesn’t always mean a property is less expensive. Always compare the total occupancy cost, including NNN expenses.

Are Triple Net Leases Common in Charleston, SC?

Yes.

Many commercial properties throughout the Charleston region—including retail centers, industrial buildings, flex spaces, and office parks—are leased under a Triple Net structure.

Areas where NNN leases are especially common include:

  • North Charleston
  • Mount Pleasant
  • Summerville
  • Johns Island
  • West Ashley
  • Goose Creek
  • Berkeley County

Because every property is different, NNN expenses can vary depending on location, property age, and maintenance requirements.

Questions to Ask Before Signing an NNN Lease

Before committing to a commercial lease, ask your broker or landlord:

  • What are the current NNN (CAM) charges per square foot?
  • Have CAM expenses increased in recent years?
  • What services are included in the CAM fees?
  • Are there any upcoming capital improvements that could affect costs?
  • How often are operating expenses reconciled?
  • Are there any expense caps or exclusions?

Understanding these details upfront can help you avoid unexpected costs later.

Should You Be Concerned About a Triple Net Lease?

Not at all.

Triple Net leases are an industry standard and can provide transparency by clearly outlining operating expenses. The key is understanding your total monthly occupancy costs—not just the advertised rental rate.

Working with an experienced commercial real estate advisor can help you evaluate lease proposals, compare properties, and negotiate favorable lease terms.

How CBC Atlantic Can Help

Navigating commercial lease agreements can be complex, especially if it’s your first time leasing space.

At Coldwell Banker Commercial Atlantic, our brokers help business owners, investors, and tenants throughout the Charleston region understand lease structures, evaluate occupancy costs, negotiate lease terms, and find the right property for their long-term goals.

Whether you’re searching for retail, office, industrial, medical, or flex space, we’re here to help you make informed real estate decisions.

Have questions about a Triple Net (NNN) lease or need help finding commercial space in Charleston? Contact Coldwell Banker Commercial Atlantic today to speak with one of our local commercial real estate professionals.