I'm still looking for the details, but since this is a blind bidding process, there is no way to know for sure how much the second place bid was for. I'm looking for the article, but I seem to remember reading that the 2nd place bid was not far off from the $12.85M though. It looks like MLB Trade rumors stated there were multiple $10M+ offers out there though. This article says that there were at least 12 teams involved with the bidding process, but there is no way to know which teams those were. Here's another article that goes through a list of teams that put in bids for Park.