A never-to-be repeated Philip Johnson masterpiece presides over nearly seven parklike acres on Dallas’s exclusive Strait Lane. Johnson, among whose iconic designs are the Crystal Cathedral and Manhattan’s Lipstick Building, created an 11,387-square-foot home with elegant, light-filled living spaces, a stunning double staircase, unique dining room with arched canopy, six lavish bedrooms, and eight baths. An exquisite and sensitive update was completed in 2008. A media house, modernist cabana, pool, and tennis court complete the award-winning estate, which has been featured in numerous books, magazines, and The New York Times. Photography by Charles Davis Smith.