How did Obama clear campaign finance rules with the purchase of land from Rezko for only 17% of its value?

Obama couldn't afford the house he bought in 2004, indicted money launderer and Obama supporter Rezko bought the lot next to Obama to lower the cost. Rezko paid $646k but sold the lot to Obama 3 years later for $100k. Given the timeframe - values rose during that period so the lot should have been worth almost a million.|||becuse he is, like most politicians a crook|||He is a human being and he has made mistakes. He got the land on a sweetheart deal. Now he is embarrassed about it..