Group 1 - Commercial real estate stocks experienced a significant decline due to concerns that the broader use of artificial intelligence tools may impact office space demand, leading to a market sell-off that began on Wednesday [1] - Major commercial real estate service companies such as CBRE saw their stock price drop by 8.8%, with a cumulative decline of 20% over two days, marking the worst performance since 2020 [1] - Other companies like JLL, Highwoods Properties, and Newmark also faced declines of 7.6%, 12%, and 4.2% respectively, while an index tracking office real estate company stocks fell by 4.2% [1] Group 2 - The sell-off in real estate stocks is described as a manifestation of "AI risk-off trading," reflecting a heightened sensitivity among investors to any signs of underperformance [3] - Concerns about AI disrupting business models intensified following the launch of new tools by startup Anthropic, leading to significant sell-offs across various sectors, including software manufacturers and real estate services [3] - Analysts noted that the market is grappling with the potential risk of AI leading to job losses in office settings, although some believe recent sell-offs may reflect an exaggerated response from traders [3]