The Milwaukee, Wisconsin city planning commission recently approved rezoning for a project many believe will be the tallest mass timber structure in the U.S., though the project must still be approved by a neighborhood zoning committee. Called the Ascent residential tower, the mixed-use structure would use cast-in concrete for the first five stories and concrete shafts from top to bottom, and would be topped by a 15-story exposed mass timber system that uses steel connectors. The building will include 205 residential units, plus floors dedicated to commercial space, enclosed parking and amenities.