OpEx Exclusions in NN Deals: What Lands in the Landlord's Column

TL;DR

Triple-net (NNN) leases pass all property operating expenses to the tenant. Double-net (NN) leases pass most — but exclude specific categories that stay with the landlord.

The exclusions vary by lease, but the most common categories that stay with the landlord in NN structures are:

• Roof and structural repairs
• HVAC major capital (sometimes)
• Management fees above a cap
• Capital improvements (clearly capital, not expense)
• Environmental remediation
• Landlord's own financing costs

For brokers underwriting NN deals, these exclusions can turn an apparently "net" cash flow into something that behaves more like a gross lease during major capital events. Understanding the specifics before closing prevents underwriting surprises.

The NNN vs NN vs N Spectrum

Before getting into exclusions, a quick framing:

Absolute NNN (Bondable Net)

Tenant pays all costs, including structural and capital. Landlord is effectively a passive bondholder. No exclusions — the lease language is broad enough that every imaginable expense flows to the tenant.

Typical NNN

Tenant pays operating expenses + capital. Landlord retains responsibility for: roof and structure in some cases (varies by market and asset class), environmental remediation for pre-lease contamination, and sometimes fire/casualty rebuilding obligations.

NN (Double-Net)

Tenant pays taxes and insurance plus most operating expenses. Landlord retains responsibility for: roof, structure, major HVAC capital, and various common-area maintenance items.

N (Single-Net)

Tenant pays only property taxes beyond base rent. Rare in modern net lease.

Gross

Tenant pays base rent only. Landlord pays all operating expenses. Often has "expense stops" where tenant pays increases above a baseline year.

Common Exclusions from Tenant Reimbursement

Roof and Structure

The most common NN exclusion. Tenant pays for interior HVAC, floors, plumbing fixtures, lighting. Landlord pays for:

• Roof: replacement, major repair (above a threshold, e.g., $5,000 or $10,000)
• Structural: foundation, load-bearing walls, structural beams
• Exterior walls: brick, stucco, siding (sometimes including painting)
• Major glass: storefront glass replacement (varies)

Why it matters: roof replacement on a 10,000 sq ft building is typically $80,000 - $150,000. Structural repairs can be $50,000 - $500,000+. If the lease excludes these from tenant reimbursement, the landlord is carrying that capital risk.

How to spot it: search the lease for "exclusions from operating expenses" or "landlord's obligations." The language is typically a bullet list within the OpEx reimbursement clause.

HVAC Major Capital

Many NN leases exclude HVAC replacement while including HVAC maintenance as tenant-paid. The line between "replacement" and "major repair" is typically defined by cost threshold or by whether the item has a useful life over some period (e.g., items with useful life over 5 years are capital; items with shorter useful life are expense).

Why it matters: a rooftop HVAC unit replacement on a 15,000 sq ft retail box can be $15,000 - $40,000+ per unit. Buildings often have multiple units.

How to spot it: look for language like "HVAC maintenance and repair excluding replacement of the unit itself" or "HVAC repair not to exceed [X]% of annual base rent."

Capital Improvements Generally

Most NN leases distinguish between:

• Operating expenses: items with useful life under some threshold (typically 5 years), pass-through to tenant
• Capital expenses: items with longer useful life, landlord's responsibility (sometimes amortized into tenant charges over the item's useful life)

Why it matters: parking lot resurfacing, roof replacement, HVAC replacement, lighting upgrades — all typical capital items — cost real money. If they're landlord-paid, they reduce NOI.

How to spot it: look for a definition of "capital improvements" in the lease. Note the threshold used to distinguish capital from operating.

Management Fee Overages

Most NN leases allow the landlord to charge a management fee — typically 3-5% of gross rent or CAM — for managing the property. This is generally pass-through to the tenant.

But some leases cap the management fee or exclude increases above a benchmark. If the landlord's actual management cost exceeds the cap, the overage stays with the landlord.

Why it matters: for larger multi-tenant properties, management costs are real. Caps can meaningfully affect landlord economics.

How to spot it: search for "management fee" in the lease. Note any caps or indexed-growth limits.

Environmental Remediation

Pre-existing environmental conditions (contamination, underground tanks, etc.) are almost always landlord-paid, not tenant-paid. This protects the tenant from liability for conditions that existed before they took occupancy.

Why it matters: environmental remediation can be $100,000 - $10M+ depending on the property history. Phase I ESA at purchase should flag any pre-existing issues; unidentified post-purchase issues can surface years later.

How to spot it: look for "environmental" sections of the lease. There's typically a landlord representation that the property is free of contamination, with remediation responsibility tied to pre-existing conditions.

Landlord's Own Costs

Certain costs associated with the landlord's ownership are excluded:

• Financing costs: mortgage payments, lender fees, refinancing costs
• Landlord's own administrative costs: office rent, salaries unrelated to the property
• Capital raises: costs of selling the property, capital gains taxes, 1031 exchange fees
• Landlord's insurance: liability coverage beyond property insurance

Why it matters: these are structural exclusions that are rarely controversial. But occasionally a landlord tries to charge something like "administrative fee for loan servicing" that's really a financing cost — watch for these.

Leasing Commissions and TI

For multi-tenant NN properties, leasing commissions and tenant improvement allowances for new tenants are typically landlord-paid (though some leases allow amortization into CAM). For the existing tenant's own renewal costs, it varies.

Why it matters: for multi-tenant centers with meaningful turnover, leasing costs can be 2-4% of gross rent annually. If they're all landlord-paid, NOI is reduced.

How to spot it: look for a definition of CAM. Note whether leasing commissions and TI are included in pass-through or excluded.

Practical Impact on Underwriting

For NN deals with meaningful exclusions, underwriting should reflect the landlord's retained obligations. Approaches:

Approach 1: Reserve-Based Adjustment

Apply a reserve against NOI for:

• Roof replacement: typical budget $0.15-$0.50 per sq ft per year depending on roof type and age
• HVAC replacement: typical budget $0.10-$0.25 per sq ft per year
• Parking lot resurfacing: typical budget $0.05-$0.15 per sq ft per year
• Other capital: structural, exterior, etc., typically $0.10-$0.20 per sq ft per year

Total reserve typically $0.40-$1.00 per sq ft annually for older NN properties. For newer properties with capex deferred, the reserve is lower.

Apply this reserve as a reduction to NOI when calculating cap rate.

Approach 2: Cap Rate Adjustment

Widen the cap rate by 25-75 bps to reflect the capital expense risk. This is rougher than reserve-based adjustment but simpler.

Approach 3: Landlord-Paid Escrow

Some NN deals set up a landlord-paid capital reserve that's funded from cash flow each year. This pre-funds major capital events and smooths the landlord's cash flow. Economically equivalent to the reserve-based adjustment but transparent in the financial statements.

When to Worry vs Not Worry

Worry Scenarios

1. Older building, near end of useful life: roof replacement, HVAC replacement, structural work all becoming imminent. Landlord's capital obligations are real and near-term.

1. Multi-tenant center with high turnover: leasing commissions, TI, and vacancy costs add up. Landlord's obligations are substantial each year.

1. Long-remaining lease but aging building: the tenant stays, but the building components age. The landlord replaces the roof, the HVAC, etc., during the lease term.

1. Environmental history: properties with underground tanks, dry cleaners, gas stations, industrial uses — pre-existing contamination risk is real.

Don't-Worry Scenarios

1. New BTS on a specific tenant: building is fresh, tenant-specific, NN exclusions are effectively theoretical because nothing will need replacement during the lease term.

1. Short remaining lease term: capital events are the next buyer's problem, not yours. Landlord obligations during a short remaining term are limited.

1. Absolute bondable NNN (not actually NN): tenant absorbs all costs including capital. Exclusions are minimal or don't exist.

How to Read the Lease for Exclusions

For any NN deal under offer:

1. Find the OpEx reimbursement clause — typically titled "Operating Expenses" or "Additional Rent" or "CAM"
2. Find the definition of Operating Expenses — what's included
3. Find the exclusions list — often a bullet list within the same section titled "Exclusions" or "Items Not Included in Operating Expenses"
4. Find the capital expenses definition — threshold for capital vs expense
5. Find the landlord's obligations clause — what the landlord commits to maintain/repair

Each of these sections contributes to the picture of what costs flow to the tenant vs stay with the landlord.

What Sponsors Negotiate For

When building new leases, sponsors try to push as much as possible to tenant-paid:

• Broad OpEx definition that captures roof repairs (short of full replacement)
• Capital threshold set high (so few items qualify as capital)
• Amortization of capital into tenant charges over useful life (still tenant-paid, just smoothed)
• Management fee with no cap
• Environmental protection for post-lease conditions only (pre-existing still landlord's)

These negotiations can add 50-200 bps to the effective cap rate of a new NN lease vs a standard-form NN lease.

Closing

NN leases look like NNN leases on the surface — same "net" label, similar cap rates. But the exclusions matter, and they vary meaningfully from lease to lease.

Brokers who read the exclusions carefully — rather than taking the "NN" label at face value — produce more accurate underwriting and set cleaner buyer expectations. The specific categories (roof, HVAC, capital, management, environmental) are the standard framework; the dollar impact depends on the specific building and lease terms.