I won't be surprised if he already have billions of dollars invested in real estate business. There is no way you know where all the investment of Alhaji Dangote spread to because the man really is a business guru. Every young business man is aspiring to get to the level of Dangote.Yes what I was trying to say is that he does not really have to know how real estate investment work, whatever and however he want to invest will be delivered to him by a trusted company that deal with investment,you can still invest in real estate investment if you have money to do that without having an understanding about it.