A NNN lease is the entire investment thesis of a net lease deal. The tenant matters, but the lease defines the relationship. A short-term NNN lease with a great tenant is a worse investment than a long-term lease with a slightly weaker tenant. Two identical-looking properties can have wildly different value based on lease terms.

This lesson covers how to read a NNN lease — the clauses that determine cap rate, the provisions that protect or expose you, and the red flags that should make you walk.

The lease is the deal

Before any pricing, before any tenant credit analysis, you read the lease. The lease tells you:

How long the income is contracted
How much it grows over time
Who pays for what
What happens if the tenant wants out
What happens if the property is damaged
What happens at lease expiration
What rights the tenant has

Without understanding the lease, you can't underwrite the deal. With the lease in hand, the underwriting is mostly mechanical.

Key clauses in a NNN lease

1. Primary term

The primary term is the initial fixed period of the lease, before any options to extend.

Common primary terms:

10 years (smaller franchise tenants)
15 years (most national retailers)
20 years (drug stores, dollar stores, banks)
25-30 years (medical, build-to-suits, ground leases)

The longer the primary term, the more valuable the lease. A 15-year remaining primary trades at a meaningfully better cap rate than a 5-year remaining primary.

Why: longer term reduces re-leasing risk. If the lease expires in 5 years, you face the risk that the tenant won't renew and the property will go vacant. If the lease expires in 15 years, that risk is far in the future.

As-of-acquisition matters: A 20-year original term lease that has 5 years remaining is treated as a 5-year lease, not a 20-year lease. Always look at remaining term, not original term.

2. Option periods

Most NNN leases include options to extend beyond the primary term. Common structures:

5 years (1 option)
4 × 5 years (4 options of 5 years each, 20 additional years)
6 × 5 years (6 options, 30 additional years)
Some leases: 10-year options or longer

Options are unilateral — only the tenant can exercise them. The landlord cannot force an option exercise.

This means:

If the tenant wants to stay, they exercise their option (good for landlord)
If the tenant wants to leave at primary term end, they don't exercise (bad for landlord)
The landlord effectively "sells" the option for free

For valuation, options are typically discounted in NNN underwriting. You can't fully count on them.

3. Rent and escalations

The rent structure tells you what cash flow to expect.

Flat rent (no escalations): Tenant pays the same rent every year of the primary term and options. Common in some older leases. Bad for investors because real income declines with inflation.

Periodic increases: Rent increases at defined intervals (every 5 years typical) by a fixed amount or percentage.

Examples:

"Rent increases by 10% in year 6"
"Rent increases by 7.5% in years 6, 11, 16, and 21"
"Rent increases by 1.5% annually"
"Rent increases by CPI annually with a 2% floor and 4% ceiling"

Annual escalations: Smoother but harder to model with CPI. CPI escalations with caps and floors are common in modern leases.

The math matters: A 1.5% annual escalation is roughly equivalent to a 7.5% increase every 5 years. They're functionally similar but feel different to tenants.

For underwriting, build the rent schedule across the entire lease term. Many "flat" leases hide step-ups in years 6, 11, etc. that meaningfully change yields.

4. Use restrictions

The lease defines what the tenant can do with the space:

"Tenant shall use the premises only as a McDonald's restaurant operating in accordance with McDonald's brand standards"
"Tenant shall use the premises only as a retail drug store"
"Tenant may use the premises for any lawful purpose"

Restrictive uses are common with corporate brand tenants. They protect the brand but limit your ability to relet the space if the tenant leaves.

Trap: Some leases include "go dark" rights — the tenant can stop operating but continue paying rent. This means a closed McDonald's might still be paying rent but providing no foot traffic to surrounding tenants. Read carefully.

5. Assignment and sublease

Can the tenant transfer the lease?

Free assignment — tenant can transfer to anyone
Assignment with consent — landlord must approve
Assignment with consent + corporate guaranty maintained — assignee is OK but original tenant remains liable
Assignment limited to similar use — protects use restrictions

For NNN with strong corporate tenants, assignment is sometimes allowed but the corporate guaranty often follows the assignee. Read the specific language.

6. Termination rights

Most NNN leases have NO termination rights — that's part of what makes them valuable. The tenant is committed for the primary term and options.

But some leases have hidden termination rights:

Termination on casualty if damage exceeds X% of property value
Termination on condemnation of significant portion
Termination on co-tenancy failure (rare in single-tenant)
Termination on operating cost cap exceeded
Termination for landlord default

Read every "termination" clause carefully. Each one is a potential exit door for the tenant.

7. Default and cure rights

What happens if the tenant defaults? How long do they have to cure?

Monetary default cure period — typically 5-10 days
Non-monetary default cure period — typically 30-60 days
Notice requirements — written notice required before declaring default
Remedies — termination, acceleration of rent, retention of security deposit

For NNN, you want strong landlord remedies. The tenant rarely defaults (these are corporate credit tenants), but if they do, you want clear and fast remedies.

8. Maintenance and repair responsibility

This is THE clause for understanding what kind of NNN you actually have.

Read carefully who is responsible for:

Roof — replacement and maintenance (the most expensive line item)
Structure — walls, foundation, framing
HVAC — equipment, repairs, replacement
Plumbing — internal and external
Electrical — internal systems and panels
Parking lot — maintenance, sealcoating, restriping, replacement
Landscaping — maintenance and replacement
Building exterior — paint, siding, repairs
Interior — finishes, partitions, equipment
Sprinkler system — fire suppression
Fire alarm system — testing and maintenance
Glass and windows — replacement
Doors — repair and replacement

A "true" NNN lease assigns ALL of these to the tenant. A "modified" NNN might leave some (typically roof and structure) with the landlord.

Common variation: Tenant pays for everything EXCEPT roof and structural integrity. Landlord still has roof and structure responsibility but is otherwise passive. This is sometimes called "NNN minus roof and structure."

Absolute NNN: All of the above are tenant's responsibility. Landlord has zero operational obligations.

9. Capital improvements and upgrades

Beyond routine maintenance, who pays for capital improvements?

ADA upgrades when required by changing law
Code compliance upgrades (energy, accessibility, fire safety)
Tenant-driven improvements (signage, branding refresh)
Major system replacements (HVAC, roof) at end of useful life

In a true NNN, the tenant pays. In a modified NNN, this might be the landlord.

The "useful life" trap: Some leases say tenant pays for replacement of items "beyond their useful life" but landlord pays "during their useful life." This sounds simple until the HVAC fails 8 years into a 10-year useful life — who pays for the replacement?

Get clear language. Vague language leads to disputes.

10. Insurance requirements

Who carries what insurance?

Property insurance (building) — usually tenant in NNN
Liability insurance — usually tenant for tenant operations
Landlord additional insured status — landlord should be named on tenant policies
Waiver of subrogation — both sides waive insurance subrogation rights against each other

Verify insurance is in place and the tenant has the right coverages. Florida-specific: hurricane and wind coverage requirements matter.

11. Tax responsibility and reset

Property taxes are the tenant's responsibility in NNN. But:

Tenant pays directly to county OR
Tenant pays landlord, landlord pays county

The first is cleaner (no landlord involvement). The second creates accounting complexity.

Also: when the property sells, taxes typically reset to the new sale price. Who bears that increase? In a true NNN, the tenant absorbs it. In some leases, there's a tax cap or pass-through limit.

Read the language. Buying an NNN where the tenant is suddenly facing 50%+ higher taxes can create tenant friction.

12. Relocation rights

Some leases allow the tenant to relocate within the building or shopping center. Common in multi-tenant retail. Less common in single-tenant NNN.

If present, understand the trigger and whether the tenant pays the cost.

13. Right to expand or contract

Some leases give the tenant rights:

To expand into adjacent space
To take additional adjacent land for parking or building
To downsize within the building

These limit landlord flexibility. Note them.

14. Cross-defaults

Some corporate tenants with multiple locations have cross-default provisions: if the tenant defaults on one location, all locations are in default. This actually helps the landlord — corporate tenants are less likely to default on any single location because of the cascading effect.

15. Estoppel obligations

The tenant agrees to provide estoppel certificates within X days of request. Important for refinancing or sale.

Standard requirement: 15-30 days. Make sure your lease has this.

A worked example: reading a Walgreens lease

Suppose you're considering a Walgreens NNN property. Here's what to look for:

Term: Original 25-year, with 8 × 5-year options (45 additional years). Standard for Walgreens.

Remaining primary: Get the exact remaining years. A Walgreens with 18 years primary remaining is worth significantly more than one with 4 years remaining.

Rent: Walgreens leases are often flat through primary term with step-ups at option periods. Build the schedule.

Use: Restricted to drug store / pharmacy use. Standard.

Assignment: Walgreens can assign with consent. Corporate guaranty typically follows.

Maintenance: Read carefully. Walgreens leases often assign all maintenance to tenant including roof and structure (true absolute NNN). But check the specific lease.

Default: Standard remedies.

Insurance: Walgreens carries; landlord additional insured.

Result: A typical Walgreens NNN with 18 years remaining primary, 6.0% cap, in a primary location, is a very passive bond-like investment.

Red flags in any NNN lease

Walk away (or significantly discount the price) if you see:

Termination rights without significant notice or penalty
Roof and structure responsibility on the landlord if marketed as "absolute NNN"
Vague or unclear maintenance responsibility (this leads to disputes)
Ability for tenant to "go dark" without rent reduction termination for shopping center properties
Renewal options at FMV (not fixed) — this means rent could drop materially at renewal
Caps on tax pass-through that could leave landlord absorbing reset costs
Personal guarantor only (no corporate guaranty) on a small franchise tenant — credit risk is high
Recent amendments that reduce tenant obligations — sign of a struggling tenant
Outstanding TI obligations from landlord — you may inherit them

Each of these can be priced into the deal but you must know about them before going hard.

What to take away

The lease IS the investment thesis in NNN — read it carefully
Primary term determines lease value; options provide upside but can't be relied on
Rent escalation structure determines long-term cash flow growth
Use restrictions limit re-leasing flexibility
"Maintenance responsibility" clause defines what kind of NNN you actually have
Watch for hidden termination rights (casualty, condemnation, operating cost caps)
Verify the assignment language — corporate guaranty should follow assignment
Always look at REMAINING primary term, not original term
"Absolute NNN" should mean truly passive — verify with the actual lease language
Walk away from leases with vague or landlord-unfriendly maintenance and termination provisions

Next lesson: tenant credit analysis — investment grade vs non-rated, how to evaluate the credit that ultimately backs your income.

Reading a NNN Lease — The Clauses That Matter