Adam Clarke on Ezekiel 48:15

And the five thousand that are left - The territory of the Levites was twenty-five thousand square cubits, Eze 48:20, But their city was only four thousand five hundred square cubits, see Eze 48:13 and Eze 48:16; there remained, therefore, ten thousand cubits square to be divided, of which five thousand cubits in breadth, by twenty-five thousand in length, on the east and west sides, were reserved for a sort of second city; or for suburbs where laymen might dwell who were employed by those priests and Levites who lodged in the temple and in the city, Eze 48:18. And another space of one thousand cubits in breadth, by twenty-five thousand in length, which extended only from north to south, was for fields and gardens appointed for the support of those lay servants. On which we may remark, there was no cultivated land between the portion of the Levites and that of the prince, but only on the east and west sides. See Eze 45:6, and the map FF.