Spanning 12,900 square feet, the house benefits from two reception rooms, a dining room, a gourmet kitchen, seven bedrooms and five bathrooms. There's also a private drive-in courtyard, underground parking, separate staff accommodation, an office, a library and a wine cellar. Of course, no luxury Mayfair mansion would be complete without a few lavish extras. Head to the plush basement and you'll discover a state-of-the-art gym, a spa with a massage room and sauna, a swimming pool, a games room and a bar.