Heartwood-Edit Published Monday, May 8, 2023 - 3:46 pm at 1050 × 529 in With one of the first mass-timber highrise apartment buildings in the United States about to open, researchers test how wood will stand up to a major Capitol Hill earthquake The Heartwood under construction. It opens for residents soon at 14th and Union. (Image: Timberlab) Share this:TweetPrintEmail