The Spanish phrase "casa de venta por dueno en Mesquite, Texas" translates to "house for sale by owner in Mesquite, Texas" in English. The phrase could be used either to search for such a house for sale, or to advertise it.
The Spanish phrase "Casa de Venta" has the same meaning as the familiar English phrase "House for Sale." It is commonly used in real estate advertising. "Casa" means "house" or "home," and "venta," related to the English word vend, means "sale". The modifying phrase "por dueno" here means "by owner." The term can also mean landlord or, if in the feminine "duena," landlady.