The Las Vegas company Boxabl is creating the $49,500 Casita, a 375-square-foot prefab tiny home. Elon Musk said he owns one of the units, which he uses as a guest house near his home in Texas. Take a tour inside the tiny home, which has a bedroom, bathroom, living room, and kitchen. Tiny homes have become an undeniably popular alternative to the classic family home or apartment.