Real Estate, Commercial

How to Underwrite a Single-Tenant NNN Property

Underwrite a single-tenant NNN property primarily as a tenant credit decision backed by real estate. Analyze the tenant's and guarantor's financial strength, remaining lease term, rent escalations and the property's dark value if the tenant leaves. Key metrics are remaining lease term, tenant credit rating, rent-to-market spread and DSCR.

What makes single-tenant net lease underwriting different

A single-tenant net lease property is essentially a bond with a building attached. The tenant pays rent plus taxes, insurance and maintenance, so the owner's income is stable as long as the tenant performs. That makes the tenant's credit, the guarantor behind the lease and the remaining term the core underwriting factors. The real estate matters most at the end: what is the property worth if the tenant leaves or does not renew? A store built for one brand may have limited appeal to other users, and above-market rent can disguise weak residual value. Location, building size and site features determine re-tenanting potential.

Lenders focus on whether the lease term covers the loan term and whether the tenant is investment grade or has a strong corporate guarantee. Credit tenant lease financing can offer high leverage when a strong tenant has a long lease. Equity investors focus on cap rate spread to treasuries, rent growth, tax benefits and residual value. They distinguish between corporate and franchisee guarantees, absolute NNN and NN leases, and fee simple versus ground lease positions, because these factors change both risk and value.

Key metrics

Remaining Lease Term

Cash flow certainty depends on how long the tenant is contractually obligated to pay.

Lenders typically prefer remaining term that extends past loan maturity, often well past it.

Tenant and Guarantor Credit

The lease is only as strong as the entity obligated on it. Corporate guarantees are stronger than franchisee or subsidiary guarantees.

Rent vs Market Rent

Above-market rent inflates value and creates downside at expiration.

Rent-to-Sales Ratio

For retail and restaurant tenants, it shows whether the location is profitable enough to renew.

Dark Value

The property's value if vacant determines the lender's downside recovery.

DSCR

Confirms rent covers debt service.

Lenders commonly look for 1.20x to 1.30x, with credit tenant lease structures sized differently.

How to underwrite it, step by step

Read the full lease, including term, options, rent escalations, landlord obligations and assignment rights.
Identify the tenant entity and guarantor and analyze their financial statements or ratings.
Evaluate store-level performance where available, including sales and rent-to-sales.
Compare rent to market rent for similar buildings in the area.
Estimate dark value and re-tenanting costs if the tenant leaves.
Confirm landlord responsibilities, such as roof and structure, and inspect those components.
Size debt against lease term, credit and DSCR, with a downside on dark value.
Confirm estoppel, SNDA and any right of first refusal on sale.

Due diligence checklist

Lease and all amendments
Guaranty agreement
Tenant financial statements or credit ratings
Tenant estoppel certificate
SNDA agreement
Store sales reports if available
Rent comparables
Property condition report including roof and structure
Title commitment and ALTA survey
Right of first refusal or purchase option documentation
Phase I environmental site assessment
Appraisal with dark value

Key risks and mitigants

Tenant bankruptcy leads to lease rejection.

Underwrite tenant credit, store profitability and dark value, and limit leverage on weaker credits.

Tenant does not renew at expiration.

Require loan maturity well before lease expiration or a cash sweep before expiration.

Rent is above market.

Underwrite residual value at market rent.

Landlord retains roof and structure obligations.

Inspect components and reserve for replacement.

Guarantee is from a franchisee, not the parent.

Analyze the franchisee's financial strength and store portfolio.

Typical financing and deal structure

Single-tenant NNN properties are financed with bank loans, life company loans, CMBS and credit tenant lease (CTL) loans. CTL financing can offer high leverage when an investment-grade tenant signs a long bondable lease, with the loan amortizing over the lease term. Many NNN buyers are 1031 exchange investors who use moderate leverage or all cash. Sale-leasebacks are a common way to create NNN assets, letting operating companies monetize real estate. Covenants typically include lease maintenance, tenant notice provisions and cash sweeps tied to tenant credit or lease expiration. Ground leases, where the tenant owns improvements, require separate analysis of reversion rights.

Red flags

Guarantor is a thinly capitalized subsidiary or franchisee.
Store sales show rent-to-sales well above sustainable levels.
Lease contains early termination rights or go-dark provisions.
Rent significantly above market for similar buildings.
Building is highly customized with little alternative use.

Frequently asked questions

What is a credit tenant lease loan?

A credit tenant lease loan is financing secured by a property leased to an investment-grade tenant on a long-term, bondable net lease. Lenders underwrite primarily the tenant's credit and size the loan so that rent payments fully or largely amortize the debt over the lease term. CTL loans can provide higher leverage than conventional real estate loans.

How do you evaluate a NNN lease?

Review the tenant and guarantor's financial strength, remaining lease term, rent escalations, renewal options, landlord responsibilities and assignment rights. Compare the rent to market and estimate the property's value if the tenant leaves. For retail tenants, look at store sales to judge whether the location is profitable and likely to renew.

What is dark value?

Dark value is the estimated value of a property if the current tenant vacates and it sits empty. It reflects market rent, downtime, re-leasing costs and alternative uses. For single-tenant properties, dark value is the lender's key downside measure, since a vacancy eliminates all income.

Is a corporate guarantee better than a franchisee guarantee?

Generally yes. A corporate guarantee from a large parent company typically provides stronger credit support than a guarantee from an individual franchisee, which may operate only a few locations. Underwriters analyze the actual guarantor's financial statements and do not rely on the brand name alone.

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Educational content, not investment, credit, legal or tax advice. Benchmarks are common practitioner rules of thumb and vary by lender, market and cycle.