Hubbell WarehouseThe Hubbell Warehouse is an historic building located in downtown Des Moines, Iowa, United States. It was listed on the National Register of Historic Places in 2010.ArchitectureThe building is a rigid frame structure built of concrete and faced with brick. The seven-story building rises above the ground, and was designed by the Des Moines architectural firm of Proudfoot, Bird & Rawson. The building at one time housed Firestone Rubber Company and L & L Insulation. It has been renovated into apartments.