RO54 is a split-level modern home perched on a Bel-Air hilltop. But this is not what your mind probably conjures when you think of a split-level home. RO54 by Arshia Architects is a dreamy façade of floating glass with view of the Pacific Ocean, designed in layers to allow a gradual ascent to the top of the roof with little effort. Located in Los Angeles, California, this sustainable home features a central “void” using bridging stairs.