Designing 21st century learning environments for both new schools and renovations/additions to existing schools is an important focus of STR’s practice. In fact, the majority of our work involves the conversion of 20th century, K-12 schools into 21st century learning environments. In 21st century schools, learning happens everywhere. Flexible classrooms equipped with smart technology and moveable furniture allow teachers to reconfigure spaces according to lesson plans, and hallways and stairwells are informal collaboration zones. Dedicated classrooms, learning commons, and even cafeterias promote project-based learning, offering space for small and large groups to meet. STR’s designs emphasize thermal comfort, natural lighting, and indoor air quality to encourage student awareness, creativity, and interaction.