LOUISVILLE, Ky. — Churchill Downs plans to drop over $6 million to revitalize downtown Louisville's old U.S. Bank building into its newest gambling venue, according to planning documents filed with Louisville Metro Planning and Design Services.

That cost, estimated at $6.35 million, only applies to the exterior of The Derby City Gaming Downtown project. Churchill Downs announced its plans for the facility on Sept. 30.

The sprawling venue will initially include 500 historical racing machines, a "fresh-air" gaming area and more than 200 on-site parking spaces, according to Churchill Downs. There will be three bar concepts, including a main-level sports bar with a stage for music and live entertainment, a premium bourbon library and a wine and charcuterie lounge.

Historical horse racing machines bear a certain resemblance and functionality to slot machines, though the former is the only legal gambling method in Kentucky. The state legislature voted to legalize historical horse racing machines earlier this year.

New details emerged from the recent cost estimate as well. Churchill Downs detailed an expanded outdoor patio area, a design feature highlighting the fabled Garland of Roses and a large outdoor video sign on the building's corner.

In total, planning documents show the project will use over 19,000 square feet and require 2,844 square feet of new construction.

These are all still early plans though, as Churchill Downs has not yet purchased the property. U.S. Bank is listed as the property's owner, with Churchill Downs named as the applicant on the documents.