OMAHA, Nebraska — Construction is underway on Omaha’s first known mass timber commercial building. It’s promoted as being more environmentally friendly than most newer commercial buildings in downtown Omaha. …Plans call for a four-story building that houses mainly offices, with street-level stores and restaurants. …Zac Gemar, the VP of Construction with Noddle Companies said the building is expected to be 50% mass timber. David Corbin, with the Nebraska Sierra Club, is hopeful. “I appreciate anybody that tries to use innovative practices to be environmentally friendly.” However, Corbin is also cautious.  “The main thing that is of concern is how they source the wood, where it comes from.” …Corbin says the Sierra Club recommends using products that are certified by the Forest Stewardship Council. The building is expected to be completed in the spring of 2024.