The apartment includes two wood-burning fireplaces, a study, family room, a large kitchen and a master bathroom with a steam shower, custom-built sauna and original fixtures from the Plaza Hotel. So what will it cost you? A cool $9.965 million. Why not just say $10 million? Oh, and you have to put at least half the cost down in cash. And one more thing -- monthly maintenance costs and taxes on the apartment currently are $6,500. (Halstead Property)