In Preston Hollow the drama begins at the entrance. Amid an acre oasis of American elms, red oaks, and a spring-fed pond, a gabion wall opens to reveal an interior courtyard with a pool and fountain. To the south, facing the water directly, are the formal living room, dining room, kitchen, and family room. The master suite nestles adjacent to the pool and spa. Joining the spaces, a shimmering glass bridge serenely reflects the lake beyond. On the upper level, three guest rooms and a playroom overlook the treetops.