פירוש על קידושין 53:5

The Talmud notes that the mishnah which taught that movables could be acquired with land was itself used as a source to connect to the acquisition of the deed with the land. This implies that this deed is considered like other movables. It is acquired through acquisition of the land.
And that folks ends our discussion of this issue. Movables may be acquired together with land even if the movables are not on that piece of land.
I should note that in the middle ages a technique developed whereby a person could transfer movables based on the idea that every Jew owns “four cubits of land in Israel.” I would give you (temporarily) my four cubits of land and with that I could also give you my movables, even if the movables were far way. This facilitated the transfer of movables without one actually having to own land, let alone put the movables on the land.