rent-seeking is the economic concept of income being captured from simply owning an asset rather than from productivity. its literally anti-capitalistic, as it's always a market distortion that creates the coercive force necessary to inefficiently funnel income this way. fair markets would compete away rent-seeking in short order.

that's different from providing rental housing, whereby owners earn rent by constantly working to provide safe and desirable housing. capitalism is premised on the idea of using markets to drive down prices to the marginal cost of production plus a small industry-/market-specific risk premium. rent-seeking is entirely counter to that.