Commercial real estate stocks tumbled for a second straight day in their sharpest sell-off since the 2008 financial crisis, wiping out tens of billions of dollars in market value as investors rapidly reassessed the industry’s future in the age of artificial intelligence. Shares of CBRE, the world’s largest commercial real estate brokerage, fell as much as 15% on Thursday, extending a two-day, 26% rout that erased roughly $12B in market value over back-to-back trading sessions.