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(b)….. 2. The generally applicable regulations for height set forth within Ch apter 34 (Zoning), Article IX (General Regulations), Division 6 (Buildings and Structures —generally ), Section 34 -1100(a), are amended to read as follows : Sec. 34 -1100. – Height —application of district regulations. (a) No building or structure, or any porti on thereof, shall have a height that is less than a minimum required height 3 , or that exceeds a maximum allowed height, specified within the regulations of the zoning district in which the building or structure is located. The term "height," when applied t o a building or structure shall refer to the vertical distance measured perpendicularly from grade level to the highest point on such building or structure. For purposes of measuring building height, the following shall be deemed the highest point of a bui lding: the level of a flat roof; the deck line of a mansard roof; and the average height level between the eaves and ridge, for gable, hip and gambrel roofs. 3. The regulations restricting nonconforming structures, set forth within Chapter 34 (Zoning), Ar ticle IX (General Regulations), Division 8 (Nonconforming Uses, Lots and Structures), Sections 34 -1146 and 34 -1147 are amended to read as follows : Sec. 34 -1146. Nonconforming structures, permitted changes. …. (e) A nonconforming structure that is an I ndivi dually Protected Property, or a contributing structure within an architectural design control district, may be expanded as set forth within section 34 -1147(2). Sec. 34 -1147. Expansion of nonconforming uses or structures. …. (c) Nonconforming structures. (1 )…. (2) Nonconforming structures, other than single -family dwellings . Where the use of a nonconforming structure is permitted by right, or with a special use or provisional use permit, in the zoning district in which the structure is located, then E xpansio n of a nonconforming structure may be approved provided that: (i) yard, setback, screening and buffering, and height standards applicable to the proposed expansion are met; (ii) all applicable sign regulations are met, and (iii) such expansion does not exc eed twenty -five (25) percent of the gross floor area of the existing structure. For any proposed expansion exceeding twenty -five (25) percent of the gross floor area of the existing structure, all development standards applicable to the property as a whole shall be met. If the nonconforming structure to be expanded is also an individually Protected Property, or a contributing structure within an architectural design control district, then that structure 3 The proposal reviewed by the PC referred to “minimum requir ed building height” and to “maximum permitted building height ”. In this proposed ordinance, the reference has been simplified to “minimum required height ” and “maximum permitted height ” to take into account that many districts specify a overall height ra nge for a building as well as a separate height range for a streetwall.