The book "AP 164: Ábalos and Herreros" offers a comprehensive analysis of the work of the architectural firm Ábalos & Herreros, founded in 1984 in Madrid. Authors Iñaki Ábalos and Juan Herreros pursued an innovative approach during a time when architecture was heavily influenced by practical aspects, combining theoretical research with practical implementation. This book presents the results of three teams that worked with archival material from the firm, provided by the Canadian Centre for Architecture (CCA). The collection includes over 250 documents, sketches, models, and drawings that illuminate the planning and design process of the firm. The contemporary interpretation of these materials opens new perspectives on the architecture of Ábalos & Herreros and questions their influence on modern architecture. The publication is aimed at professionals and enthusiasts in the field of architecture and design and is written in English.