According to jeremiah 31:38-40:
38 Behold, the days come, saith the Lord, that the city shall be built to the Lord from the tower of Hananeel unto the gate of the corner.
39 And the measuring line shall yet go forth over against it upon the hill Gareb, and shall compass about to Goath.
40 And the whole valley of the dead bodies, and of the ashes, and all the fields unto the brook of Kidron, unto the corner of the horse gate toward the east, shall be holy unto the Lord; it shall not be plucked up, nor thrown down any more for ever
Is this the dimensions to the rebuilt city after babylonial captivity? Or is it some thing in the future? Seems too specific to be purely symbolic. In context it seems to be connected to the new covenant of 31:31.