JUPITER ISLAND — A $24.3 million beachfront home here was the most expensive sold on the Treasure Coast in March.

It gives this recently-covered rustic Maine beach house a major run for its money. And be sure to check our entire treasure trove of home and real estate listings if you love mansions and castles.

Opponents argue the mansion's swimming pool sits too close to the beach and could disrupt the nesting of loggerhead, leatherback and green sea turtles. The house will span about nine times larger ...