At the very top of the Coral Gables real estate market, a small collection of ultra-luxury estates quietly defines what "prime" really means. These are the trophy properties in Gables Estates, Cocoplum, Tahiti Beach, Old Cutler Bay, and Snapper Creek Lakes—waterfront enclaves where price is driven less by square footage and more by privacy, dockage, and once‑in‑a‑generation locations along Biscayne...