For buyers looking beyond the region’s more familiar country-house markets, this Essonne property makes a clear case for the quieter side of Île-de-France. Less than an hour south of Paris, it pairs a renovated five-bedroom house with an indoor swimming pool, and just over eight acres of leafy grounds.

Designed by luxury architect Ferris Rafauli, the waterfront estate sits on Indian Creek Island with a private dock on Biscayne Bay. The gated enclave—known as the “Billionaire Bunker”—contains just 41 homes and has counted residents including Jeff Bezos, Tom Brady and Ivanka Trump.