Phoenix vacancy rates have hovered below 6% for several consecutive quarters, and Tucson's renter population has grown faster than its housing supply for the past three years. For investors targeting Arizona multi-family properties, the financing question is often less about finding a deal and more about structuring the right loan. Commercial Debt Service Coverage Ratio (DSCR) loans have become the dominant tool for this, because qualification turns on what the property earns rather than what the borrower reports on a tax return.
How DSCR Loans Work
A DSCR loan qualifies a property based on its Debt Service Coverage Ratio: Net Operating Income (NOI) divided by total annual debt service (principal plus interest). NOI equals gross rental income minus operating expenses such as property taxes, insurance, maintenance, and management fees.
A DSCR of 1.0 means income exactly covers debt payments. Most commercial DSCR lenders require a minimum of 1.20 to 1.25, meaning the property generates 20 to 25 percent more income than needed to service the loan. Some lenders will approve at 1.15 for strong-credit borrowers in high-demand markets, while others require 1.30 or higher for properties with shorter operating histories.
Example: A 12-unit Phoenix apartment complex generates $144,000 in annual gross rents. After $36,000 in operating expenses, NOI is $108,000. At a 1.25 DSCR requirement, the maximum supportable annual debt service is $86,400, which corresponds to roughly $1.4 to $1.5 million in loan principal at current rate levels.
Property Types Eligible for Commercial DSCR Financing
Commercial DSCR programs cover a broader range of property types than residential DSCR loans, which are typically capped at one-to-four units. Eligible Arizona properties generally include:
- Small multi-family (2 to 4 units): Often handled under residential DSCR programs with simpler documentation
- Mid-size apartment buildings (5 to 49 units): Core commercial DSCR territory; most lenders are active here
- Large apartment complexes (50+ units): Require agency or bank balance-sheet financing in many cases; some commercial DSCR lenders go to 100+ units
- Mixed-use properties: Ground-floor commercial with residential above; lenders typically underwrite residential and commercial income separately
- Short-term rental portfolios: Some lenders accept market-rate STR income using AirDNA or comparable data; others require a 12-month operating history
