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Code of the City of Portsmouth. The Building Official and the Board shall make their decisions in accordance with the rules, regulations and guidelines prc~ulgated by the Federal Insurance Administrator. ' 3. That Section 12 1/2-6 (e) be added to Chapter 12 1/2 of the Code of the City of Portsmouth, Virginia, 1973, to read as follows: Section 12 1/2-6(e). Any such permitted d~elopment is subject to all other applicable Federal and State rules and regulations. 4. That Section 12 1/2-9 be added to Chapter 12 1/2 of the Code of the City of Portsmouth, Virgmuia, 1973, to read.as follows: Section 12 1/2-9. Substan-~ial improver~ent, definition of. Substantial improvea~nt, as used herein, means any repair, re- construction, or improvement of a structure, the cost of which equals or exceeds 50 percent of the market value of the structure either, (a) before the improvement or repair is started, or (b) if the stmucture has been damaged, and is being restored, before the damage occurred. For the purpQses of this definition "substantial ~prove~nt" is considered to occur when the first alteration of any wall, ceiling, floor or other structural part of the building ~s, whether or not that alteration affects the external dimensions of the structure. The ten~ does not, however, include either (1) any project for ~provement of a structure to comply with existing state or local health, sanitary, or. safety code specifications which are solely necess~-y to assure safe livir~ conditions or (2) any alteration of a strucuure listed on the National Register of Historic Places or a State Inventory of H~toric Places. ~ 5. ~aat Section 12 1/2-10 be added to Chapter 12 1/2 of the Cede of the City of Portsmouth, Virginia, 1973, to read as follows: Section 12 1/2-10. Flood Control Management, criteria relative to placement of mobile homes. All mobile hc~es placed within Flood Hazard District 1 ,~/4-1) shall be anchored to resist flotation,, collapse, or lateral movement by pro- riding ove_r-the~top and frame ties to ground anchors. (a) Specific requir~a~nts for the plaomment of mobile hc~es shall be that: (1) Over-the-top ties are tx) be provided at each of the four corners of the mobile hc~e, with two additional ties per side at inter- mediate locations and mobile hc~es .less than 50 feet long requiring one additional tie per side;