Miami-Dade County unveiled a new proposal late Tuesday for a $525 million ballpark for the Marlins at the Orange Bowl.

Still in draft form – and I’m told still in need of significant work – the proposal relies on more money from the public sector than previous proposals and, in turn, less from the Marlins, although the team would put its money up front, rather than in the form of rent payments.

According to a county memo, the plan calls for Miami-Dade County to contribute a total $249 million to the project: $199 million in hotel bed and sports facilities taxes and $50 million from the general obligation bond county voters approved in 2004 for renovation of the Orange Bowl stadium.

The last plan made public called for the county to contribute $145 million in tourist taxes and issue the bonds for the stadium the team would repay in rent.

The plan anticipates that the city of Miami would put up $121 million in tourist taxes. That’s up from $108 million in earlier versions of the deal. The city would also need to build a 6,000-space parking garage.

The team’s contribution would be $155 million up front, rather than $207 million, which would have come as $45 million up front and $162 million in future rent payments.

Miami-Dade County Commissioners are scheduled to consider the plan at their meeting next Tuesday and if they are in agreement, they would direct county staff to work out the full details of the plan. The Miami City Commission, meanwhile meets this Thursday, and is expected at least to discuss the Marlins stadium issue.

The county’s plan envisions a 37,000-seat retractable roof stadium at the site of the Orange Bowl to open by April 1, 2011.

The $525 million projected cost – up from $490 million earlier this year – has increased because it includes $10 million in Orange Bowl demolition and other infrastructure costs and requires a speedy 29-month schedule for construction, which would begin in November.

The plan requires the team to sign a non-relocation agreement prohibiting a move until the expiration of the management agreement or the bonds are retired, whichever is later. It also requires the team to change its name to Miami Marlins by the 2011 season.

The Marlins have been seeking a new home for years, since they pay rent at Dolphin Stadium and only receive percentages of parking, concessions and advertising signage. The team has lease options at the stadium through the 2010 season. The team and Major League Baseball have said the Marlins cannot survive in South Florida without a new ballpark where they could control their own revenue.

The team traded third baseman Miguel Cabrera and pitcher Dontrelle Willis, the last two remaining players from the 2003 World Series championship team, last week to the Detroit Tigers for six players in a move that shaved some $20 million from the payroll.