"Shark Tank" investor Barbara Corcoran once delivered a package to a Manhattan penthouse. She bought it for $10 million more than two decades later.

Generally, guests cannot stay for longer than 30 days at a time, and landlords are often on the lookout for violations.

Tim Dettmers is one of the scientists at the cutting edge of artificial intelligence who contributed to the DeepSeek breakthrough that grabbed the world’s attention this past week. He’s never had any ...