They were replaced by Brothers-Valleys, a club formed in 2002 by the merger of Past Brothers, who played in the Queensland Cup from 1996 to 1998, and the Fortitude Valley Diehards, who originally folded in 1995.
Easts hit back 10 minutes into the second half when former Australian and Queensland representative Steve Renouf spun through a defender to score in the corner.
With just over a minute to play, Burleigh's Kris Flint attempted a field goal that would've sealed the game for the Bears but missed to the right, giving Easts one last chance.
With 30 seconds remaining, Tigers' halfback Dane Campbell put in a chip kick for winger Steve Beattie, who burst through two Burleigh defenders to score.
Both teams missed multiple field goal attempts before Burleigh prop Shane O'Flanagan barged over to score the premiership-winning try in the 17th minute of extra time.