“We’re going to try and do a mix to meet the market demand,” he said.

Harris was in St. Louis Thursday with Andrew “Avi” Greenbaum, a founder and principal of Hudson Holdings of Delray Beach, Fla.

“Hudson is very excited to add such a monumental asset to our portfolio,” Greenbaum said in a statement. “We are looking forward to working closely with the city of St. Louis on this historic adaptive re-use project.”

Beyond apartments, figuring out what to do with the other half of the space is still a work in progress. There might be 100,000 square feet or so of office space, although Harris said that at this point the amount was still a guess. A health club, pool and maybe even a day care center might also be part of the amenity mix.

“That’s one of the options, but there’s a ton of options out there,” Harris said.

New York-based MLK Real Estate Capital arranged the $20 million in financing for Hudson Holdings to purchase the building. It was a “challenging transaction” to finance the purchase of such a large building that isn’t producing any income, MLK managing principal Solomon Kinraich said.

“There were a lot of obstacles to overcome,” Kinraich said.