An NNN lease, short for triple net lease, shifts three categories of ongoing property cost onto the tenant: property taxes, building insurance, and maintenance. The landlord collects rent and, in the cleanest versions, writes very few checks after that. The term gets used loosely in marketing, though, and a Colorado buyer evaluating a listing needs to know which obligations are actually in the lease rather than assumed from the label.
The Three Nets, One at a Time
Property taxes are the first net, and in a true triple net lease the tenant reimburses or pays them directly. The second net is insurance, typically the building and liability coverage the tenant carries or reimburses. The third is maintenance, which is where lease language varies the most. Some triple net leases push roof and structure onto the tenant as well; many keep those two items with the landlord even while calling the lease triple net, which matters enormously for a buyer estimating long-term capital costs.
The order matters less than the totality. A lease that pushes taxes and insurance to the tenant but keeps roof and structure with the landlord is still commonly marketed as triple net, even though the landlord retains meaningful capital exposure. Reading the maintenance clause specifically, rather than trusting the summary label, is the step buyers skip most often and regret later.
NNN Versus Gross and Modified Gross
A gross lease bundles taxes, insurance, and maintenance into a single rent figure the landlord manages and pays from. A modified gross lease splits some of those costs between landlord and tenant, often with the landlord still handling structural items. An NNN lease pushes the largest share onto the tenant, which is why net lease rent quotes tend to look lower per square foot than gross lease quotes for a comparable building; the number is measuring a smaller bundle of landlord responsibility.
Why NNN Structures Show Up So Often in Net Lease Listings
Retail and single-tenant buildings, from a Front Range pharmacy to a highway-adjacent quick-service pad, lease themselves out this way because the tenant already runs the operation and is positioned to manage its own taxes and insurance obligations more efficiently than a distant landlord. That structure also produces the low-maintenance income profile that appeals to a Colorado owner who wants real estate exposure without landlord duties, which is a large part of why net lease inventory dominates so much 1031 replacement conversation.
National tenants with dozens or hundreds of locations also prefer standardized triple net terms because it lets their real estate department manage lease obligations consistently across every market they operate in, rather than negotiating a custom structure for every Colorado location individually. That standardization is part of why net lease paperwork tends to look so similar from one listing to the next.
The Lease Abstract Answers the Real Question
The label on a listing sheet is a starting point, not a substitute for the actual lease. A lease abstract lays out exactly which costs the tenant covers, what happens at renewal, whether rent escalates on a fixed schedule or stays flat, and who is responsible for roof and structure if those weren't already clear. Two properties both marketed as NNN can carry materially different landlord obligations once the abstract is read line by line.
Where NNN Leases Fit an Exchange Timeline
Because the tenant handles most operating costs, NNN properties are easier to underwrite quickly, which matters against a fixed 45-day identification window and 180-day closing deadline. Speed still depends on getting a lender and title company engaged early enough to keep pace with a shorter due-diligence period than a more management-intensive property type would require.
Common Questions
Does an NNN lease always mean the tenant covers roof and structure?
No. That depends on the specific lease. Some triple net leases push roof and structure to the tenant, but many keep those two items with the landlord, so the actual lease document needs to be checked rather than assumed from the label.
How is an NNN lease different from a modified gross lease?
A modified gross lease splits taxes, insurance, and maintenance between landlord and tenant, while an NNN lease shifts the largest share of those costs to the tenant, which is why quoted rent per square foot tends to look lower on net lease listings.
Why does NNN rent look lower than gross lease rent for similar buildings?
The quoted figure is measuring a smaller bundle of landlord responsibility, since the tenant is separately paying taxes, insurance, and maintenance rather than having those costs folded into the rent number.
Are NNN properties a common 1031 replacement choice in Colorado?
Yes, largely because the passive structure and relatively fast underwriting timeline fit well against the fixed deadlines of an exchange, though tenant credit and lease term still need full review.
What should a buyer read before trusting the NNN label on a listing?
The lease abstract. It shows exactly which costs the tenant covers and what happens at the next renewal, which the marketing sheet alone often does not make clear.
