The three-story building that the Central Arkansas Library System and Moses Tucker Real Estate are negotiating to build at the corner of President Clinton Avenue and River Market Avenue — there’s a parking lot and a police substation there now — has at least one known interested tenant: a restaurant developed by New York Culinary School alum Payne Harding. (Harding is also one of the new owners of Restaurant 1620, which is being remodeled and will open under the name 1620 Savoy — in honor of the first integrated jazz club in New York — in “early fall,” general manager Rick Qualls said.) Harding’s father, Rush Harding, is one of the investors in the new restaurant, which will be designed by the Atlanta restaurant design firm the Johnson Studio.