Horizontal boundary definition

Horizontal boundary means a plane of elevation relative to a described bench mark that defines either a lower or an upper dimension of a unit such that the real estate respectively below or above the defined plane is not a part of the unit.
Horizontal boundary means a plane of elevation relative to a described bench mark that defines either a
Horizontal boundary means a plane of elevation relative to a described bench mark that defines either a lower or an upper dim ension of a un it such that the real e state respectiv ely below o r above the defined pla ne is not a part of the unit.