Get some land off from the existing land-owners who have it in excess over some threshold (by legislating some "ceiling on land-holding" act). Of course, that should not be done entirely in the "communist style" though, i.e. it can be done by giving them reasonable compensation.
I guess, some "ceiling on land-holding" act is a must if we want reasonable check on inequality. Currently the US economy stinks of the problems of feudalism - some kings and barons with a lot of land and then some more people down their rank with some land while the rest of the people with almost no land and perpetual poverty.
I am not saying "Land Value Tax", which basically is a levy on the "unimproved" value of land.[1]
What I am saying is nobody (including corporations) should be allowed to own land for the sake of renting purposes. If you own more than a threshold, you should just hand it over to the government, for some compensation and then if you think you have any excess land left over that you can rent, you should just sell it.
In short, no renting of land at all.
I know, there are some issues to it, but I guess, those can be resolved, without much harming the economy of the 99.99% of the people.
Please correct me if I am wrong w.r.t. "Land Value Tax" vs "ceiling on land holding".
