Imagine owning a private beach, a 136-meter pool, and a boat basin, all within your own backyard. This is the reality for the lucky buyer of a Florida Keys mansion, listed for a staggering US$40 million. The property, spanning 761 square meters across six parcels, is a coastal paradise that was once the family estate and book-producing haven of naturalist Herbert Zim. Over four years, developer Todd Maino transformed the aging property into a luxurious compound, leaving some cosmetic details open-ended for the future owner's personal touch. This approach allows the new owner to shape the space according to their own vision, rather than buying into someone else's pre-determined design. The main home boasts five bedrooms, multiple entertaining areas, and interiors featuring marble, teak flooring, and custom millwork. It also includes a sound system, a lift, a climate-controlled workshop, a mudroom, an office, and multiple waterfront terraces, perfect for outdoor living. The property's protected boat basin includes deep-water dockage capable of accommodating large vessels, a feature that would be challenging to replicate under current regulations. Maino emphasizes the ecological balance of the estate, noting the frequent appearances of wildlife such as osprey, sandpipers, and peacocks. This unique property offers a rare opportunity for those seeking a truly exclusive and natural retreat. While the price tag may be steep, the potential for customization and the unparalleled access to waterfront luxury make it an irresistible prospect for the discerning buyer. The question remains: who will be the fortunate individual to call this beachside paradise home?