Billionaires usually shop for grand mansions, but Elon Musk is not the usual billionaire. In 2022, the Tesla Inc. CEO made headlines by revealing that he owns a tiny home made by Boxabl, a company that specializes in making prefabricated modular housing units. Musk said he uses the tiny home as a guest house. But the unit, called the Casita, comes with plenty of features, including a full-size bathroom, kitchen, appliances, tall ceilings and big windows. Coming in at 361 square feet, the Casita