Baba Basra 4:3-4

Baba Basra 4:3

If a person sells a house, the sale includes the door (which is a permanent fixture) but not the key (which is not part of the house). The sale includes a permanently-affixed mortar but not a portable one; it includes the lower, fixed millstone but not the hopper (a utensil into which grain is poured); it does not include a stove or an oven (which were movable appliances). If the seller specifies that the sale includes everything in the house, than all of these things are included.

Baba Basra 4:4

If a person sells a courtyard, it includes houses, wells, ditches and caves on the property but not any movable goods. If the seller specifies that the sale includes everything in the courtyard, then everything is included. In either event, the sale does not include a bathhouse or olive press that are on the property (because these things are not considered part of a courtyard). Rabbi Eliezer says that one who sells a a courtyard only sells the airspace.