Drawing from the unique design experience at Adrian Smith + Gordon Gill Architecture (AS+GG) as architects of the next world's tallest tower and several others under construction, "Supertall Megatall: How High Can We Go?" highlights the design, sustainability, innovative technology, programming, and contextualism that defines supertall and megatall towers. The book is a mixture of under construction and design-only projects divided into several chapters that are organized according to their special characteristics: Innovative Systems, Harnessing Energies, Designing an Icon, Extending Ecologies, and Achieving Megatall. Each project, completed between 2007-2020 at AS+GG, is discovered through context, program, form, research and development, and performance, highlighting the stories, challenges, and lessons learned.