So the house he bought didn't increase in value; it's a completely new building. How much profit he's accrued depends entirely on how much he spent having the new building built.

Ah, this house. Yes he bought the property and then basically rebuilt the entire building. In the process he messed up the street. causing much inconvenience to his neighbors. When the neighbors complained, he tried to say he owned the street. Song fixed the street when commanded to do do by the city. It still took many more months to do so. But it finally got done. Hope he enjoys his profit. Looks like it was a good business venture.