South Park Marina, located at 8500 and 8604 Dallas Avenue S in the South Park neighborhood of Seattle, WA (King County), presents a rare opportunity to acquire a waterfront marina property for sale on the Duwamish River. The ±3.74-acre site features approximately 1,800 linear feet of dockage with 6-foot-wide pressure-treated wood docks and moorage for up to 150 boats ranging from 22 to 50 feet, along with a boatyard capable of storing up to 65 upland vessels. The marina provides 30-amp power service at all slips and yard locations and has maintained near 100% historical occupancy with an active waitlist. With Industrial zoning, no DNR lease, and multiple revenue streams including slip rentals, upland storage, repair yard, and tenant leases, the property also offers potential for future redevelopment under Seattle’s industrial zoning. South Park Marina represents a unique opportunity to acquire a marina investment and waterfront commercial property for sale in Seattle, Washington.