The Twitter Headquarters is located in San Francisco, California and is known as the 'NEST'. The NEST is a modern office building that houses the headquarters of the popular social media platform. It is a seven-story building with a rooftop terrace and a large open courtyard. The building was designed by the architecture firm Gensler and opened in 2012. It is a LEED-certified building, meaning it meets the highest standards of sustainability.