NNN leases shift variable operating costs to tenants but not capital expenditures. Landlords absorb roof replacement, structural repairs, and major capital items. Investors who model only base rent without capital reserves face material NOI surprises. Understanding landlord obligations—and building adequate reserves—separates profitable operators from those facing cash crises.
Tenant vs. Landlord Expense Allocation
Tenant Pays (Recoverable):
- Property taxes (pro-rata share)
- Insurance premiums (pro-rata share)
- CAM: common area maintenance, parking lot, landscaping, trash removal, utilities
- HVAC repairs (depending on lease language)
- Roof replacement and major structural repairs
- Foundation work and water intrusion
- Parking lot seal coating and re-striping (though some leases split)
- Major HVAC replacements (if lease limits tenant to repairs only)
- Exterior structural damage and code compliance upgrades
CAM Reconciliation Mechanics and Risk
Annual CAM requires reconciliation between estimated and actual costs. Estimate year-one CAM at $8,000 across all tenants, collect monthly/quarterly pro-rata payments, then true-up at year-end. Tenants dispute reconciliations (a $2,000/month CAM estimate hitting with a $400 true-up feels expensive), and CAM creep is common. Unexpected snow removal ($3,000), delayed seal coating ($5,000), and other items accumulate.
Critical calculation: Pro-rata percentages depend on occupancy basis. Most sophisticated leases pro-rata recoverable CAM based on occupied sqft only—the landlord absorbs CAM for vacant space. Conservative underwriting assumes 85-90% occupancy for CAM recovery, even if purchased at 95% leased.
Roof Reserve and Capital Replacement
Roof replacement is the number-one surprise for retail center owners. A typical 50,000 sqft strip mall roof costs $6-12/sqft to replace in 2024-2026, totaling $300,000-$600,000. Most investors fail to model roof reserves.
Professional approach: Set aside $200-300/month per occupied sqft in roof reserve. On a 50,000 sqft property at 85% occupancy, that's $8,500-$12,750/month. Over 20 years, reserves build to $2-3M, covering roof replacement plus parking and structural issues.
Action item: Get professional roof inspection at acquisition. Original 1995 roof? You're 5-8 years from replacement—price accordingly.
Property Management Costs
Third-party property management runs 4-8% of gross collected rent. A $1M annual rent property costs $40,000-$80,000/year. Management includes tenant screening, lease administration, CAM reconciliation, maintenance coordination, tenant relations, and compliance tracking.
Self-management works for 1-2 properties but becomes untenable by property 5-10. Most professional investors use third-party management by their third acquisition.
Insurance Cost Environment (2024-2026)
Commercial property insurance has escalated dramatically. Policies costing $3,500/year in 2020 now run $6,000-$8,000 for retail strip malls. Wildfire exposure, construction cost inflation, and property loss history drive increases.
Budget $1.50-$2.50/sqft annually for landlord coverage on strip malls. A 50,000 sqft property needs $75,000-$125,000/year. In NNN leases, tenants typically reimburse pro-rata share through recoverable expenses.
Insurance structure:
- Landlord-procured (more common): Landlord buys master policy, tenants reimburse share
- Tenant-responsible (rare): Each tenant buys own liability, landlord maintains property damage
Capital Expenditure Planning
Properties typically arrive with deferred maintenance. A 2010-built strip mall commonly requires:
- Parking lot seal coating: $8,000-$15,000
- HVAC unit replacement (original units): $4,000-$8,000 per unit
- Exterior paint and signage: $3,000-$10,000
- LED lighting retrofit: $5,000-$15,000
5-year CapEx schedule:
- Years 2-3: Parking lot seal
- Years 4-5: HVAC replacements (staggered)
- Years 5-6: Roof inspection and patching
- Years 6-8: Major roof work or replacement
Structural Risks and Environmental Issues
Flood-prone properties: Properties in 100-year flood plains require flood insurance, adding $3,000-$8,000/year to landlord costs. Lenders mandate this coverage.
Environmental contamination: Past dry cleaner, gas station, or auto repair tenants trigger mandatory Phase I environmental site assessment. Remediation costs range $20,000-$500,000+ depending on severity.
Foundation problems: Settling, cracking, and water intrusion are catastrophic and landlord expense, running $50,000-$200,000+.
Professional engineering inspection before closing is non-negotiable.
Vacancy Risk and Turnover
Models assuming 100% occupancy ignore market reality. Strip malls average 5-10% vacancy over a full market cycle. A 5,000 sqft tenant vacancy at $14/sqft costs $70,000/year in rent plus $5,000-$15,000 in tenant improvements to release. That's a 20-40% NOI swing.
Conservative occupancy assumptions:
- 85-90% on acquisition
- 2-3% annual turnover
- 3-6 months downtime between leases
- 5-10% of rent spent on TI allowances
Bottom Line
NNN doesn't mean landlord-free operation. Capital reserves are non-negotiable. Budget roof reserves, CapEx reserves, property management (4-8% of rent), and insurance ($1.50-$2.50/sqft). Model conservatively and assume vacancy risk. Build these costs into underwriting from day one. Investors who treat NNN as passive income face material surprises; those who understand actual costs succeed.