Prince's Paisley Park to be Sold .... Family Ready to Fight It

Prince's famous Paisley Park mansion could soon hit the open market, but there's a legal beef brewing that might squash the whole thing ... TMZ has learned.

The bank managing Prince's estate filed docs asking the court to let it sell a bunch of Prince's properties, and Paisley Park is the clear gem on the list.

It's not up for sale yet, but as the bank says in the docs ... "The properties that the special administrator is currently anticipating will be sold, and the appraised value of same are listed in spreadsheet attached as Exhibit A."

The appraised value for the more than 60,000 square feet of Paisley Park is listed at just over $7 million -- and the bank's already hired a real estate agent.

This could get messy. Sources close to the family tell us Prince's heirs will do everything they can to block the administrators from selling the legendary home and studio. We're told they'd rather turn it into a museum.