This Madison Avenue duplex penthouse, owned by John McColgan and Moya Doherty, the director and producer of Riverdance, was originally listed in the summer of '08 for $10.5 million. It got one 10 percent PriceChop that September. Then the real bloodbath began: an 18 percent chop in March and a 23 percent cut in September. The property was last asking $5.95 million, and it closed in late November for $5.85 million. McColgan and Doherty, who live in Dublin but have gone on a few Manhattan buying sprees, paid $5.5 million for the property in 2003, so they're still step dancing all the way to the bank.