Thanks Rick for the info. The leaves of this plant do look somewhat like those of a ficus johannis/afghanististica.
Just got a bit more info from the original owner. He actually started the plants from germinating seeds from some dried figs brought back from China. After having read briefly online, it seems that might be the reason why this plant has not bore any fruits. And it might never, it seems.
I am keeping it because it's a beautiful tree.