This monograph presents a decade of O&O Baukunst's architectural achievements, showcasing all buildings realized since 2012. The firm has significantly shaped Germany's landscape, completing major administrative buildings, delivering sustainable infrastructure projects, and making a notable impact in the cultural and residential sectors. These projects underscore the intricate nature of contemporary construction, highlighting the challenge of integrating sustainability, CO2 certification, technical demands, and design excellence. The book also traces the evolution of O&O Baukunst, founded by artist-architect brothers Manfred and Laurids Ortner, and now led by architects Roland Duda, Florian Matzker, and Markus Penell from their offices in Berlin and Vienna.