https://billionairemailinglist.blogspot.com/2015/09/birmingham-60000-sq-ft-mega-mansion-to.html http://homesoftherich.net/2016/05/54000-square-foot-mega-mansion-in-shoal-creek-al-re-listed/
They must've been in a hurry to drop the price so quickly, properties like this sometimes go unsold for years before the owners drop the price.