Twitter, now known as X, is closing its San Francisco headquarters and relocating its employees to the South Bay. The company will shut down its offices over the next few weeks and move its engineering workers to Palo Alto, while other employees will be relocated to San Jose. This decision marks the end of an era for Mid-Market, a downtown neighborhood that was once a hub for tech companies. The move is seen as a significant shift for the company, which had been a major presence in San Francisco for over a decade.