In some inland cities in China more than 40% of grade-A offices are empty. Yet technology companies are now fuelling demand https://www.economist.com/finance-and-economics/2026/05/07/deepseek-and-alibaba-rescue-chinas-office-landlords?taid=69fff962999f620001573e26&utm_campaign=trueanthem&utm_medium=social&utm_source=voante