The West Indies haven sits waterfront with a custom mural by Los Angeles–based artist Abel Macias. 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