Adam Smith had a bit of a Marxist view (though, he did come up with it first) on the land value of real property, considering deriving rent from it as "unearned" without labor, which looks a little too close to comfort to appealing to what we would call today the "labor theory of value" which we now know is a largely useless device for creating or observing markets intended to provide voluntary ~free exchange of the fruits of capital and labor.
Most modern capitalist views do not subscribe to labor theory of value or "earned" value. Though views on landlordism do originate more with Smith than with Marx, it's not wrong to also attribute many of those thoughts to Marx.
