Most people here only build when they have money. Mortgages is not very common here. So, when they have money, they continue building.
Another thing you see here and in central Asia is that you don't pay tax because your house is still not finished. Therefor in the middle East you are very often that the top floor is missing...
Now you know
I see this a lot in Caribbean nations also. Lots of cinder blocks and rebar sticking up. Sometimes living in the first floor with a partially completed second floor. With little money things progress slowly or not at all.