A second publicly known Seattle NBA expansion proposal now has a more specific arena concept.
BlackSun Private Equity and the Tulalip Tribes are partnering on a proposed arena and entertainment district on tribal-owned land near Marysville if the NBA selects BlackSun’s Seattle expansion bid, BlackSun chief global strategy and communications officer Nick Rathod told The Athletic.
“BlackSun and the Tulalip Tribes are 100 percent partnering,” Rathod told the outlet. The proposed site is about 35 miles north of Seattle. The plan remains conditional: the NBA has not awarded BlackSun a franchise, approved the arena location or announced an expansion decision.
What has been confirmed
The new report gives the public a clearer view of the BlackSun proposal than its initial August announcement. The group is not simply describing tribal participation in general terms; it is publicly tying its arena and entertainment-district concept to the Tulalip Tribes.
BlackSun has said it wants to build a broader destination around the potential venue. Rathod told The Athletic that the group is studying highway capacity, regional transit, dedicated game transportation, park-and-ride options and shuttles because it recognizes that the trip would be significant for many Seattle-area fans.
That mobility question is central, not incidental. An NBA team plays 41 regular-season home games, and an arena north of Marysville would ask a different kind of travel commitment from the Seattle, Tacoma and airport-area fan bases than a downtown venue would.
How this changes the Seattle ownership picture
The Athletic identified BlackSun as the second known bidder for a possible Seattle expansion franchise. The other known group is One Roof Sports and Entertainment, led by Seattle Kraken owner Samantha Holloway, which has an existing connection to Climate Pledge Arena.
The comparison is now easier to understand. One Roof begins with an established Seattle venue. BlackSun is proposing a future arena-and-district project with the Tulalip Tribes. Neither approach has been endorsed by the NBA, and neither is a guarantee that the SuperSonics will return.
What fans should not assume
This is not an NBA decision, a final arena approval or a completed ownership structure. It is a reported partnership tied to a bid that still must clear the league’s expansion process.
The NBA is reviewing prospective ownership groups and their financial and arena plans. The league’s reported bidder-information process remains the broader context. For now, the Marysville proposal gives Seattle fans a new, concrete vision to evaluate alongside the existing Climate Pledge Arena path.