The NHL team says a group called Absolute Hockey Enterprises has signed a purchase agreement with current owner Palace Sports and Entertainment.
The deal includes the leasing rights to the St. Pete Times Forum and adjacent properties.
The sale is subject to approval by the NHL's board of governors.
Absolute Hockey also includes Jeff Sherrin and Oren Koules. Team spokesman Jay Preble said Sherrin is a Coral Springs real estate developer and Koules a TV and movie producer.
MacLean coached Florida to the Stanley Cup final in 1996. He was fired in April as the Columbus Blue Jackets president and GM.
The Lightning won the Stanley Cup in 2004.