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ORDINANCE NO. NS- 1673 PAGE SIX (b) The owner of such building commences work under said permit on permits within two hundred and seventy (270) days after service of the director's order; and (c) The owner of such building completes installation and receives all required City of Santa Ana approvals for said work within one (1) year after service of the director's order. SECTION 6: That Section 8-2006 of the Santa Ana Municipal Code, is hereby amended to read as follows: Sec. 8-2006. Materials of Construction. (a) GENERAL. Ail materials permitted by this Code including their appropriate allowable stresses and those existing configuration of materials specified herein may be utilized to meet the requirements of th~s article. (b) EXISTING MATERIALS. (1) UNREINFORCED MASONRY WALLS. Unreinforced masonry walls analyzed in accordance with this section may provide vertical support for roof and floor construction and resistance to lateral loads. Tension stresses due to seismic forces normal to the wall may be neglected if the wall does not exceed the height or length to thickness ratio and the inplane shear stresses due to seismic loads as set forth in Table D. If the wall height-thickness ratio exceeds the specified limits, the wall may be supported by vertical members designed in accordance with the requirements of Chapter 23 of the Uniform Building Code. In addition, deflection of the supporting members at design loads shall not exceed one-tenth (1/10th) of the wall thickness. The vertical supporting members shall be attached to the floor and roof construction for their design loads independently of the required wall anchors. Horizontal spacing the vertical members shall not exceed one-half (1/2) the unsupported height of the wall or ten (10) feet maximum. However, the maximum horizontal spacing of wall anchors at any anchorage level shall not exceed that specified in Section 8-2007. The wall height or length may be measured horizon- tally to existing supporting elements providing the stiffness of the supporting member is at least twice as stiff as the tributary wall. Stiffness shall be based on the gross section.