When Nathan Turner set out to reimagine and expand a longtime client’s Turks and Caicos residence, he kept one insight front and center. “These are people who entertain a lot,” he says. The empty nesters planned to host their children, along with a steady rotation of friends and relatives. “The house would be full.” Often. After a gut renovation—overseen by local firm Coast Architects—of the existing tropical modern structure and the addition of a similarly styled wing that more than tripled the original square footage, the property now counts nine bedrooms. “Times that by two, and there could easily be 18-plus people in the house,” Turner says. With that in mind, the Los Angeles–based designer approached the project as though he were creating a boutique hotel. That mindset shaped everything. Turner put as much focus on private refuge as on communal gathering. It may sound counterintuitive in a house designed for entertaining, but as..