(a) Fences or hedges may not exceed three and one-half feet in height in the required front yard.
(b) Fences may not exceed four feet in height in the required side yard adjacent to the main building and projected to the required front yard.
(c) Fences may not exceed seven feet in height in any other location on a lot. (See Diagram A for illustration.)
(d) In any Professional -Research -Office District no fence, structure or planting shall be built or maintained in such a manner that visibility is obstructed from intersecting streets within eighty feet in each direction from the intersection of the street centerlines.
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