The apartment, a 4,200-square-foot luxury co-op formerly inhabited by Marjorie Merriweather Post and E.F. Hutton, was purchased by Wall Street mogul Steven B. Klinsky and his wife Maureen Sherry for $8.5 million.
[1] The apartment's hidden dimension began to reveal itself with the arrival of a letter stamped "Lost Post."
It contained a poem full of riddles leading to puzzles covertly embedded throughout the apartment in the form of hidden keys, secret compartments, and glowing boxes.
[2] In total, eighteen clues were hidden, including a novel and a soundtrack with original music written by Canadian singers Kate Fenner and Chris Brown.
[3] The clues embedded in the mystery apartment were a vast collaboration by many people at the firm, and outside artists enlisted by Clough.