A trio of well-known business leaders have submitted a proposal to purchase and redevelop 95.5 acres of downtown St. Petersburg, including the Historic Gas Plant District.

Casey Ellison, CEO of Ellison Companies;Cathie Wood, the founder of global investment firm ARK Invest; and Jonathan Graham, President of Horus Construction are behind the effort. Baker Barrios would serve as the master planner architect.

The group submitted a 98-page unsolicited proposal to the City of St. Petersburg this morning outlining a $6.8 billion vision for a new mixed-use district anchored by innovation, housing, cultural institutions, and world-class event venues.

The project would be built in four phases over the next 17 years and will include flexibility to accommodate the Tampa Bay Rays should the team remain beyond 2028.

ARK Invest, a leading global investment firm known for its focus on disruptive innovation, will relocate its downtown St. Pete headquarters to the EDGE District.

Tampa-based Ellison Development announced Wednesday that ARK Invest, which is currently headquartered at 200 Central Avenue, will occupy 13,000 square feet on the 11th floor of Halcyon, a new office building expected to break ground later this year at 1301 Central Avenue.

Halcyon represents the first Class A office building constructed in downtown St. Pete since the 1980s.

The 11-story, 130,000-square-foot office building is one of the main components of The Central, a 2.1-acre mixed-use development that will also contain a 168-room Marriott Autograph Collection hotel, 14,000 square feet of retail space, a 42-unit affordable housing community, and a newly opened 540-space parking garage.