The landlord-rent system is intrinsically unjust. Generally, the 'owner' makes money off of something he possesses, instead of earning money from something he does. This was one of the triggers of the Russian Revolution....
Unearned income is condemned in the worlds great religious systems- the Koran forbids usury, Mennonites and Quakers are not allowed to invest in the stock market...Money chasing after money has made monkeys of us all....When Jesus said render unto Caesar that which is Caesars, he was being sarcastic. Nothing belongs to Caesar.