By Matt Audilet With an announcement on Tuesday, the Pat Bowlen Trust officially began the sale process for the Broncos franchise. And according to recent reports, whoever purchases the team will have to shell out a significant amount of dough. The Denver franchise is expected to sell for more than $4 billion. “The #Broncos are for sale. Look for the price to start with a 4,” NFL Network insider Ian Rapoport wrote in response to the announcement. Back in January, a Denver judge ruled that the heirs of former Broncos owner Edgar Kaiser Jr. could not buy back any portion of the team as part of a…