It boasts the tallest building in the world, the 830-meter-tall Burj Khalifa, alongside Burj Azizi (665m), Princess Tower (413m), and a host of other architectural feats. But one construction ...

A sprawling duplex penthouse spanning the 107th and 108th floors of the Burj Khalifa — the world’s tallest building — is now for sale, listed for roughly $49 million. Perched nearly 2,300 ...