The Ritz-Carlton and Four Seasons are opening up luxury condos where the ultra-wealthy can live year-round, and it basically looks like a very extended hotel stay -- minus the tourists

Finchatton/Four Seasons Hotels and Resorts Some of the world's most luxurious hotel chains are opening up private residences — apartments with all the perks and amenities of a 5-star hotel stay. Four Seasons, The Ritz-Carlton, and Mandarin Oriental are all opening standalone branded residences, separate from the hotels they share a name with. Twenty Grosvenor Square, Four Seasons' first standalone residential building, has units starting at $21.5 million and amenities including a steam room an...