Been a few months since we've had a good flip at One Beacon Court, and this one's doubly good, because it involves a profit and a boldface name. Tina Knowles, mom of Beyonce and owner of a 42nd-floor unit at One Beacon, is about to sell her place, the Post reports. Will she be leaving the rest of the family behind in the building? The final price is expected to be around $5.1 million. A bit of a chop: it asked $5,999,999, $5.8 million, and $5.6 million over the last couple of months. But it last sold for $2,927,468 in 2005, so One Beacon can still count this one in the "success" column.