daf bit: Bava Metzia 108
If a stranger wishes to purchase the land to build houses, and the abutting neighbor wants the land for sowing, habitation is more important and there is no preemption. If a rocky ridge or a plantation of young palm trees lies between the fields, we consider: if the abutting neighbor can enter the field even with a single furrow, i.e. there is some place along the boundary where they connect and he could plow through, then the neighbor can preempt the sale, but if not, not. And if a field has four neighbors and one forestalls the others, it is valid, but if they all come together to buy, the field is divided along the diagonals (so everybody gets a wedge). (108b)
There is a diagram on the page of the division into four.
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