Despite San Francisco's economic decline and high office vacancy rate, AI startups are flocking to the city and signing deals for more than 1 million square feet of office space this year. The city's office vacancy rate hit a record 34% in the third quarter, yet AI companies are expanding their presence, increasing their total footprint to 3.4 million square feet. San Francisco's attractiveness to AI startups contradicts predictions of the city's irreversible decline. What's the status of San Francisco?