Developers of an 18-story, 329-unit apartment building in downtown Denver say they’re a year away from completion.

General contractor The Weitz Company and developer LMC are building The Radiant apartment building at 21st and Welton streets next to the L Route of the RTD Light Rail System.

They say the 486,000-square-foot apartment building will open in June 2019. Developers said they used 30,000 yards of concrete, 140 miles of post-tensioned cable and 1,400 tons of rebar to pour the building’s…