One of the first concrete core structures ever built was Bellevue III. This new technology required new innovations in placing boom technology. On this job Northwest introduced the Putzmeister detach system. Taking a boom out of the spline and remounting it on an electric pedestal. Soon to follow is what is now series two or the Putzmeister detach system. Also on Bellevue III Northwest was the first company using the Putzmeister wall bracket. The bracket was designed by Northwest then engineered and manufactured by Putzmeister. This bracket has become the staple for concrete core construction. Since Bellevue III, Northwest has leased the core wall brackets on projects where the contractor has chosen Putzmeister or Schwing tube style.