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(b) Fifty percent or more of the area of the exterior walls of a building, <br />including windows and doors, as measured contiguously around the building (see <br />diagram). The shaded area illustrates the maximum amount that may be removed <br />without constituting demolition as defined by this provision. <br />(c) Any exterior wall, including windows and doors, facing a public street, <br />but not an act or process which removes an exterior wall facing an alley (see <br />diagram). The shaded area illustrates the maximum amount that may be removed <br />without constituting demolition as defined by this provision. <br />A wall shall meet the following minimum standards to be considered a retained <br />exterior wall: <br />(1) The wall shall retain studs or other structural elements, the exterior wall <br />finish, windows (which includes glazing, framing, sill, sash, and muntins), <br />2 <br />