Christoph Mackler's latest completed building project is the striking 170-metre-high OpernTurm in Frankfurt/Main. With it he has altered the appearance of one of the city's most important urban squares. With the Alte Oper and the other surrounding buildings, the office building rises seven stories to form a remarkable metropolitan ensemble. This publication documents each stage of the design and construction - from the first idea to completion. Texts by Wolfgang Sonne, Walter A. Noebel, Dankwart Guratzsch, Jerry I. Speyer and Christoph Mackler, accompanied by many illustrations (photographs, drawings, plans), trace the story of the Opera Tower in detail.