Bargain $8 million condo just the latest favor from Sergey Brin's banker

The $8.5 million pied-à-terre that Google cofounder Sergey Brin and 23andMe cofounder Anne Wojcicki recently purchased in Manhattan's Greenwich Village? The previous owner, Bill Brady, paid $7 million for the condo around a year ago and was trying to move the unit for as much as $12 million after buying into a…