NR Investments broke ground on the Uni Tower apartment building in Miami’s Arts & Entertainment District after obtaining a $61.05 million construction loan. Walker & Dunlop provided the mortgage to Uni 17th Street LLC, managed by Ron Gottesmann of Miami-based NR Investments. It covers the 22,455-square-foot site at 90 N.E. 17th St. and 1642 N.E. First Ave.