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c. Applicability — Structure Additions and Renovation <br />Additions to existing structures resulting in an increase of gross floor <br />area of the structure of less than 100%; and/or installation of <br />replacement exterior surfacing any portion of an existing structure shall <br />be exempt from the standards of this subdivision where it is found that <br />the new or replacement exterior surfacing proposed is identical to that <br />of the existing structure. <br />Where additions to an existing structure result inan increase in the gross <br />floor area of the existing structure of 100% or greater, the entire structure <br />(existing structure and structure addition) shall be subject to the standard <br />of this subdivision. <br />d. Performance Standards — Primary Exterior Surfacing <br />The Primary Exterior Surfacing of structures shall be limited to natural <br />brick, stone, or glass. Artificial or veneer brick or stone shall not qualify <br />as complying with this performance standard. <br />Primary Exterior Surface shall be defined as not less than 70% of the sum <br />of the area of all exterior walls of a structure nominally perpendicular to <br />the ground. All parapet or mansard surfaces extending above the ceiling <br />height of the structure shall be considered exterior surface for the purposes <br />of this subdivision. Windows and glass doors shall be considered a <br />primary surface, but the sum area of such glass shall be deducted from the <br />wall area for purposes of the 70% Primary/30% Accent formulas of this <br />section. Doors of any type or material, except glass, shall not be <br />considered a primary exterior surface. <br />Each wall of the structure shall be calculated separately; and, individually <br />comply with the 70/30 formula. <br />e. Performance Standard — Exterior Surfacing Accents <br />Not more than 30% of the exterior wall surfacing, as defined by paragraph <br />D above may be of the following listed Accent Materials, but no single. <br />Accent Material, except natural wood, may comprise more than 20% of <br />the total of all Accent Materials; and no combustible materials shall be <br />used: <br />i. Wood Siding <br />ii. Cement Fiber Board <br />iii. Standing Seam Metal <br />iv. Architectural Metal <br />V. Stucco <br />vi. Poured in Place Concrete (Excluding "tilt -up" panels) <br />vii. Architect Metal Panels or Sheets <br />viii. Porcelain or Ceramic Tile <br />