Reimbursement Basis

Detailed Description of Reimbursement Basis

The reimbursement basis is a critical factor in commercial mortgage underwriting because it determines the predictability of a property's cash flow. Lenders analyze the reimbursement structure to assess how much risk the landlord carries regarding rising inflation or unexpected increases in property taxes and utility costs.

There are several key components and structures involved in a reimbursement basis:

• Triple Net (NNN) Leases: This is the most landlord-friendly reimbursement basis. Under a NNN lease, the tenant is responsible for their pro-rata share of all "big three" operating expenses: real estate taxes, property insurance, and common area maintenance (CAM).
• Gross Leases and Base Years: In a Gross or Modified Gross lease, the landlord pays the initial operating expenses. However, the reimbursement basis often includes a Base Year provision. The tenant is responsible for paying any increases in operating expenses that occur above the costs incurred during that specific base year.
• Expense Stops: This is a tool used by lenders and landlords to limit the landlord's exposure. An expense stop is a set dollar amount per square foot. The landlord pays for expenses up to that stop, and the tenant reimburses the landlord for any costs that exceed that amount.
• Common Area Maintenance (CAM): This reimbursement category covers shared costs such as landscaping, snow removal, security, and janitorial services for lobby areas. Under a reimbursement basis, these costs are usually divided among tenants based on the percentage of the total building area they occupy.

Importance in Commercial Mortgage Underwriting

Lenders view a strong reimbursement basis as a form of risk mitigation. When a property operates on a "full reimbursement" or "NNN" basis, the borrower is protected from spikes in expenses. If property taxes double, the tenants pay the difference, not the landlord. This guarantees that the income available to service the mortgage debt remains consistent.

Conversely, if a property has a "slippage" in its reimbursement basis—meaning the landlord is unable to recover a significant portion of the operating expenses—the lender may perceive the loan as higher risk. Underwriters will carefully review reimbursement audits and reconciliation statements to ensure that the borrower is effectively collecting these funds as permitted by the lease agreements.

Ultimately, the Reimbursement Basis defines the efficiency of a commercial asset. A well-structured reimbursement schedule converts a volatile gross income stream into a reliable net income stream, which is the primary metric used to determine the maximum loan amount and interest rate for a commercial mortgage.