For 35 years following WWII rental income as a percent of GDP was trending down. Then came Reagan and the beginning of the "financialization" of our economy.
From the mid-1980s rental income started to trend higher and in the 1990s, it literally exploded to the upside as a percentage of GDP.
Then we had the financial crisis and it dropped, briefly.
But now it's higher than ever. This means that more and more of our national income comes from people doing nothing more than extracting rents from assets (property). Sadly, incomes from actual production of goods and services is a declining percentage of GDP.
I am tempted to invoke Keynes here and say, "Euthanize the rentiers!!" (I guess I just did.)