Nonconforming structures shall comply with the following:
A. A nonconforming structure may not be expanded or altered in any way so as to increase that nonconformity.
B. When a nonconforming structure has been destroyed, damaged, or incurred a loss equal to or greater than 50 percent of its assessed value or equal to or greater than 50 percent of multifamily residential units have displaced occupants it shall comply with the requirements of RMC 15.06.015 and 15.06.016.
C. Where structures have separate fire areas, either by definition or by geographic configuration as determined by the Fire Code Official, the percentage of damage or unit count may be figured based upon the assessed valuation, or number of units, contained within a fire area. Requirements of RMC 15.06.015 and 15.06.016 shall apply to the fire area only, except that the design and installation of any system shall accommodate future extension in other areas of the structure.
D. A nonconforming structure shall be brought into full compliance with RMC Chapter 15.06, the Redmond Fire Code, when alteration or expansion of the structure takes place and the following takes place within any three-year period:
1. The gross floor area of the structure is increased by 100 percent or more; or
2. The costs stated on all approved building permit applications for the structure equal or exceed the value of the existing structure at the beginning of that three-year period.
E. For purposes of this section, a multifamily residential unit has displaced occupants whenever the unit has been declared by the Building Official to be unsafe for occupancy due to fire damage, destruction or loss.