Triple Net (NNN) Lease Financing Explained: How Credit-Tenant Deals Get Underwritten

What "Triple Net" Actually Means

In a triple net (NNN) lease, the tenant — not the landlord — pays the property's three major operating costs directly: property taxes, building insurance, and maintenance, on top of base rent. The owner receives a largely passive income stream, which is exactly why NNN assets attract investors who want real estate exposure without hands-on property management.

Why NNN Financing Works Differently

A standard commercial mortgage underwrites the property — its condition, its market, its comparable rents. NNN financing underwrites the lease just as heavily, because a NNN property's cash flow is only as reliable as the tenant paying it.

This is where credit-tenant lease (CTL) financing comes in: a distinct underwriting approach for NNN properties leased to investment-grade tenants (national pharmacy chains, major retailers, credit-rated corporate tenants). CTL lenders price primarily off the tenant's credit rating and the lease's remaining term — not a market-rent analysis of the building — because the tenant's corporate guarantee is effectively what's securing the loan.

Why the Tenant's Credit Rating Moves Your Rate

Investment-grade corporate tenants on long-term leases: cap rates typically run 5.50%–6.75%, and financing terms reflect that lower perceived risk.

Sub-investment-grade or private/local operators: expect cap rates 100–350 basis points wider, and correspondingly higher financing costs, even on an identical building and lease structure.

The building is the same in both cases. The tenant's ability to keep paying rent for the next 10–15 years is what actually changes the pricing.

What Lenders Actually Look At

Remaining lease term. A 15-year lease with 12 years remaining underwrites very differently than the same lease with 2 years left before renewal risk.

Tenant credit and corporate guarantee. Is this a corporate-guaranteed lease from a rated public company, or a franchisee-level guarantee with weaker backing?

Renewal options and rent escalations. Built-in rent bumps and multiple renewal options reduce re-leasing risk at maturity.

Property fungibility. A single-tenant building purpose-built for one use (a bank branch, a specialty medical use) carries more re-leasing risk than a standard retail box multiple tenant types could occupy.

Current Terms

NNN and credit-tenant financing is running roughly 5.75%–6.30% on strong investment-grade credit deals as of mid-2026, with 60–75% LTV typical depending on tenant quality and remaining lease term.

Who This Fits

Investors rolling proceeds from a sale into a passive, credit-backed asset — including many [1031 exchange buyers](/insights/commercial-maturity-wall-real-numbers) seeking a hands-off replacement property — along with portfolio investors adding stabilized, low-management-intensity assets alongside their more active bridge and value-add holdings.

If you are underwriting a NNN acquisition, [send us the lease, the tenant, and the rent roll](/apply) — we will tell you what the credit quality of that specific tenant actually does to your financing terms before you're under a hard deposit.