The purpose of this study is to examine I. M. Pei and his partner Harry Cobb's downtown Dallas architecture within the context of their overall stylistic development. This paper explores the structure of five buildings within the framework of the city, and addresses their possible influence on the city's future architectural direction. The thesis is divided into six chapters. Chapter I introduces and states the problem as it discusses the fabric of Dallas architecture. Chapter II outlines a brief biography of I. M. Pei, looking to those who have influenced him, while discussing the key public buildings of his stylistic development. Chapter III is devoted to Pei's first structure in the city, the Dallas Municipal Administration Center. Chapter IV explores the concepts of his planned Morton H. Meyerson Symphony Center. Chapter V outlines a brief biography and focuses on the work of Harry N. Cobb: One Dallas Centre, ARCO Tower, and the Allied Bank Tower. Chapter VI summarizes the contributions of Pei and Cobb by placing them within the context of twentieth century architecture, and pointing out their specific achievements with their additions to the fabric of Dallas architecture.