The ganging of precision-fitted, fiber glass-reinforced plastic formwork has produced seamless architectural columns and has effected savings in construction time and costs. These combined benefits went into the construction of a 13 story tower at Columbia University's School of International Affairs in New York City. The architects, Harrison and Abramovitz, New York City, designed the tower with more than 1,000 seamless columns. Fiberglass reinforced plastic (FRP) formwork was selected to obtain joints tight enough to be seamless. The forms were precision-fitted to prevent leakage so that the desired smooth exterior surface would result. Three column forms were ganged to make one casting unit, and each form was reused 12 times. The lightweight forms made the job possible; heavier forms, such as those made of steel, would have made the handling difficult and , therefore, not economically feasible. The ganged forms were lifted form floor to floor with a tower crane and placed over rebar cages already in place. They were then anchored with braces which were passed through the window opening, supporting the outer form section from inside. This method was developed to comply with the architect's specification prohibiting ties in the wall form. After concrete was placed for each column and sufficient time had elapsed for setting, a track jack was used to break the bond. The tower crane then picked up the ganged unit and moved it to another