THE FOURS SEASONS WILL FLOAT on a luxury residential cruise ship development slated for a 2010 delivery. BV International Ocean Holdings opened sales for private residences aboard Four Seasons Ocean Residences, a partnership with the Four Seasons Hotels and Resorts brand. The 48,600-ton residential vessel will have 112 wholly owned one-, two-, three- and four-bedroom residences, from 800 to more than 7,000 square feet, starting at $3.8 million and will feature a helipad, a putting green and more than 70,000 square feet of public space.