2–4 Unit Multi-Family Financing in SeaTac, WA

2–4 Unit Multi-Family investing in SeaTac

A 2–4 unit property in SeaTac is still residential financing — it is underwritten on the 1025 Small Residential Income Property appraisal rather than a commercial rent roll, so you keep 30-year fixed terms while spreading vacancy risk across multiple doors. Losing one tenant in a duplex costs you roughly half your income instead of all of it.

At the SeaTac median of $550,000, a 2–4 unit multi-family prices near $869,000 for a typical duplex — small multifamily trades at a premium per building but a discount per door. Minimum down is 25% ($217,250), leaving a loan of $651,750. Estimated all-in PITIA runs about $5,583 per month.

Returns and structure

Return metrics at the SeaTac median for this product: an estimated cap rate of 4.22%, and monthly cash flow of $654 negative at 25% down. Negative cash flow at the minimum down payment is common in appreciation-led markets; investors close the gap with a larger down payment, a purchase below median, an added unit, or a rate buydown.