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Real estate? What is the connection between real estate and property?

(1) real estate?

Is there a narrow and broad interpretation of real estate? Real estate in a narrow sense mainly refers to houses? Housing foundation and attached land? Attached land refers to the courtyard area of the house? Open space between buildings? Land that is closely integrated with houses and residential bases in space such as occupying roads? Real estate in a broad sense refers to all land and houses.