(Seattle, WA)  --  Paul Allen's stakes in the Portland Trail Blazers and two other pro sports teams could sell for four-billion-dollars.  Forbes Magazine is making that estimate based on recent sales and the projected market values.  The Microsoft co-founder died Monday and owned the Seattle Seahawks of the NFL, the Portland Trail Blazers of the NBA and a minority stake in the Seattle Sounders of the MLS.  Forbes is estimating the Trail Blazers would sell for one-point-three billion.