Where to Put Capital
How NNN Leases Work
A plain explanation of how a NNN lease actually allocates costs between landlord and tenant, and why Illinois exchangers gravitate toward this structure.
An NNN lease sounds like a single, uniform product, but the term covers a range of arrangements that all share one core feature: the tenant, not the landlord, pays the operating costs of the building. Understanding exactly which costs shift, and which stay put, is the difference between an investor who buys a genuinely low-management asset and one who discovers a year in that the lease was not as net as advertised.
01
The Three Nets Explained
The three "nets" refer to property tax, building insurance, and common area or structural maintenance. In a single net lease, the tenant covers property tax only. Double net adds insurance to the tenant's side. Triple net pushes all three onto the tenant, including most maintenance. Illinois property tax bills, particularly in Cook County, can run high relative to other states, which makes the tax pass-through provision worth reading closely rather than assuming it works the same way it would in a lower-tax jurisdiction.
02
What Usually Stays With the Landlord
Even in a well-drafted triple net lease, some obligations commonly stay with the owner. Roof and structural repairs are the most frequent carve-out, since tenants generally resist taking on capital-intensive building components they do not control the construction quality of. Parking lot resurfacing and major HVAC replacement can go either way depending on how the lease is written. An Illinois buyer should treat the actual lease language, not the listing description, as the source of truth on who owes what.
Landlords also typically retain responsibility for property-level financing, insurance claims coordination, and any capital improvement the tenant is not contractually required to fund, even when day-to-day operating costs sit with the tenant.
03
Rent Escalations Inside a Net Lease
Because operating costs are largely off the landlord's plate, the return in a net lease comes almost entirely from the base rent and its scheduled increases. Most net leases build in fixed annual or periodic bumps, commonly in the one to three percent range, or step increases at renewal option periods. These are set at signing and do not track inflation or local market rent growth, so an Illinois investor buying into a lease with modest fixed bumps is accepting a return profile that will not adjust if Chicagoland rents move up faster than the lease anticipated.
04
Why This Structure Suits a 1031 Timeline
A net lease with an audited rent roll and a straightforward reimbursement structure is easier to underwrite quickly than a multi-tenant property with varying lease terms, which matters when an exchanger is working inside a fixed 45-day identification window after selling Illinois property. The tradeoff for that underwriting speed is less control over future upside, since the lease terms are already fixed. We walk Illinois clients through the actual reimbursement language on prospective replacement properties before the identification deadline forces a decision.
05
Reading a Common Area Maintenance Clause Correctly
The common area maintenance, or CAM, section of a net lease is where a lot of the real cost detail hides. Some leases cap the tenant's annual CAM increase at a fixed percentage, which protects the tenant from a sudden spike but can leave the landlord absorbing the difference if actual costs rise faster than the cap allows. Other leases pass through actual costs with no ceiling, shifting more risk to the tenant but potentially inviting disputes over what counts as a legitimate common area expense.
Multi-tenant net lease properties, such as a small strip center with several net leases in place, add another layer of complexity, since CAM costs typically get allocated across tenants based on their proportional share of leased square footage. An Illinois buyer should confirm that the reconciliation process, meaning how often actual costs are compared against estimated payments and trued up, is clearly defined in each lease, since ambiguity here is a common source of tenant disputes after closing.
Questions
Common questions
Does a NNN lease mean the landlord has zero ongoing costs
No. Roof, structure, and sometimes major capital items commonly stay with the landlord even in a triple net lease, so it reduces but does not eliminate ownership responsibility.
How are rent increases typically structured in a net lease
Most use fixed annual or periodic percentage bumps, or step-ups tied to renewal option periods, set in advance rather than tied to inflation or comparable market rents.
Is Illinois property tax passed through the same way in every lease
The pass-through mechanism varies by lease, and Cook County's relatively high tax burden makes it worth confirming exactly how increases are billed and capped, since some leases include reimbursement ceilings.
Can a net lease structure work for a 1031 exchange with a tight deadline
Often yes, because a single-tenant net lease with clean financial records is generally faster to underwrite than a complex multi-tenant property, which helps inside the 45-day identification window.
What is the difference between double net and triple net
Double net typically shifts property tax and insurance to the tenant while the landlord keeps maintenance and structural responsibility, whereas triple net adds most maintenance obligations to the tenant's side as well.
Ready to see how how nnn leases work fits your Illinois 1031 exchange? Talk through the timeline, replacement options, and documentation before the identification clock starts.
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