What it means
In a conventional gross lease, the landlord collects one rent figure and pays the property's outgoings out of it. A triple net lease reverses that, splitting the payment into a low base rent plus a separate charge for taxes, insurance and common area maintenance, usually billed monthly against an estimate and reconciled once a year.
Landlords like the structure because it converts property ownership into something closer to a bond. Rising insurance premiums, a reassessed tax bill or an expensive roof repair land on the tenant rather than eroding the owner's return, which makes the income stream easier to value and to borrow against.
Tenants accept it in exchange for a lower base rent and, usually, more control over the building. The trade-off is budget uncertainty, because the net charges can move sharply, and a tenant who focuses only on the quoted base rent will badly underestimate their true occupancy cost.
Negotiation therefore centres on the details rather than the headline rent. Experienced tenants push for caps on annual increases in the maintenance charge, exclusions for structural work such as the roof and foundations, audit rights over the landlord's calculations, and a clear list of what may and may not be recharged.
Variations matter. A single net lease adds only taxes, a double net lease adds taxes and insurance, and an absolute net lease leaves the tenant responsible for everything including structural failure, which is a materially different risk from a standard NNN arrangement.
In practice
Real-world examples.
Example
A pharmacy chain leases 12,000 square feet in a retail park on a fifteen year NNN lease at $18 per square foot base. Its property team models net charges rising 4% a year and builds that escalation into the store's profitability forecast before signing.
Example
A logistics operator takes a warehouse on an absolute net lease and discovers three years in that a failing roof is entirely its responsibility. The $340,000 repair falls straight to its profit and loss account, a cost that a standard NNN lease with a structural carve-out would have left with the landlord.
Example
A property investor buys a single tenant distribution centre let on a twelve year NNN lease to an investment grade tenant. Because the income is net of outgoings and contractually fixed, the lender offers finance at a lower margin than it would on a multi-tenant office building.
Think of it
“NNN is triple net-tenant pays all the extra costs beyond base rent.
Formula
Calculation
Total annual occupancy cost = (base rent per square foot + net charges per square foot) x square feet
A specialty retailer signs a triple net lease on a 10,000 square foot unit at a base rent of $22 per square foot, with estimated net charges of $8 per square foot covering property tax, insurance and common area maintenance. Base rent is 10,000 x $22 = $220,000 a year and net charges are 10,000 x $8 = $80,000.
Total occupancy cost is $220,000 + $80,000 = $300,000, an effective rate of $300,000 / 10,000 = $30 per square foot. If the property tax assessment rises and net charges move from $8 to $9.50 per square foot, the annual bill becomes $220,000 + $95,000 = $315,000, a 5% increase in total cost even though the base rent has not changed at all.Case study
Seen in the real world.
This is a fictional, illustrative example. Tallow Lane Bakery, an invented chain of eleven cafes, compared two units in the same town: one at $34 per square foot on a gross lease and one at $23 per square foot on an NNN lease. The founder chose the NNN unit on the assumption it was clearly cheaper.
In the first year the net charges came in at $9 per square foot, giving a total of $32 per square foot, so the decision looked reasonable. In year three, a reassessment lifted property taxes and the landlord replaced the car park surface and recharged it, pushing net charges to $14.50 per square foot and total occupancy to $37.50, above the gross lease the founder had rejected.
In this illustrative scenario Tallow Lane renegotiated at the next break, securing a 5% annual cap on the maintenance element, a structural carve-out and the right to audit the landlord's calculations. The fictional finance director then rewrote the company's site appraisal template so that every future comparison used total occupancy cost per square foot rather than base rent.
Watch out
Common mistakes.
- Comparing an NNN base rent with a gross rent as if they were the same measure, which makes the triple net unit look far cheaper than it really is.
- Signing without a cap on annual increases in common area maintenance, leaving the tenant exposed to whatever the landlord chooses to spend and recharge.
- Assuming "triple net" always excludes structural repairs, when an absolute net lease can push roof, foundations and building systems onto the tenant.
Questions
People also ask.
What exactly are the three nets?
Property taxes, building insurance and maintenance, which in multi-tenant properties is usually billed as a share of common area maintenance.
Are NNN charges estimated or actual?
Both: the landlord bills monthly estimates through the year and reconciles to actual spend afterwards, so a balancing invoice or credit follows the year end.
Why do investors pay more for NNN properties?
Because the income is predictable and largely insulated from cost inflation, which lowers the perceived risk and therefore the yield an investor will accept.
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