A 10story office building planned for Ohio City could become the tallest timberframed building in the U.S. in 2021. The ninestory Intro building from Illinoisbased development firm Harbor Bay Real Estate will include 298 apartments, a retail space, and a venue for events.A new Cleveland project is setting a record, as the work will result in the construction of the nation's largest mass timber building. A Chicago company plans to build a 13story apartment building in the University District out of wood, the country's secondtallest wood The ninestory development, dubbed Intro, will include 298 apartments, retail space and an event venue. It is being built primarily with mass timber. The planned complex is a 115foot tall, 288unit residential property. Intro, what will be (for at least a short while) the tallest building.