5. Created in 2016, the International WELL Building Institute (IWBI) is in many ways a “people-first” spinoff of USGBC. Its aim is “to advance a global culture of health through better buildings,” so the group awards its own credentials, such as the WELL Building Standard and the WELL Health-Safety Rating. In its first six years, IWBI has already certified projects in nearly 110 countries, covering roughly how many square feet?