Book excerpt: Pelli Clarke Pelli, founded in 1977 by Cesar Pelli, is an architectural office of worldwide renown. They are known in particular for their elegant and technically advanced tower designs. These are usually characterized by taut, seamless envelopes without exposed profiles – their visual structure is achieved by subtly staggered forms or variations in the color or materiality of the façade glazing. The unusual offi ce structure of Pelli Clarke Pelli informs the work: an almost craft-like perception of architectural design and a close personal relation with the client are typical for their approach. A model-making workshop within the offi ce helps to fi nd the appropriate form. Many projects also fulfi l urbanistic roles: They create urban spaces or act as iconic landmarks within the city fabric. The publication encompasses a selection of works from the past eight years. Amongst the documented projects are Bloomberg Tower in New York, Minneapolis Central Library, Transbay Transit Center in San Francisco, National Museum of Art in Osaka, Xiao Bai Lo Tower in Tianjin and Torre Cajasol in Sevilla.