Where does the strongman get the money from?

The new headquarters for the Ministry of National Assembly and Senate Relations and Inspection is going to be built by an obscure and unknown company without offices. Very strange. Even a phantom can build in Cambodia. And who pays for the building? Our strongman donates $1 Million for it. Even with his salary, it's impossible to save such a big sum during his life time. Where did he get that money? This is the corruption at its best.