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L. Structural Integrity For all CDBG programs, rehabilitation requires that at least twenty percent (20%) (CDBG and DRI) of the original structure remain after construction, based upon the following formula. Three (3) major components of the house are considered, with each component weighted to total one hundred percent (100%) of the structural value of the house. These components and ratios are: roof — twenty percent (20%), exterior walls — sixty percent (60%), and flooring system — twenty percent (20%). As an illustration, assume fifty percent (50%) of the roof must be replaced, fifty percent (50%) of the walls must be replaced and twenty-five percent (25 %) of the flooring system (including framing) must be replaced. The factors are then ratioed based on the 20/60/20 formula, so that fifty percent (50%) replacement of the roof is equal to replacing ten percent (10%) of the structure, fifty percent (50%) replacement of the exterior walls equals thirty percent (30%) replacement of the structure, and twenty-five (25 %) replacement of the flooring system equals five percent (5%) replacement of the structure. Thus, replacement equals ten percent (10%), plus thirty percent (30%), plus five percent (5%), or a total of forty-five (45%) of the structure. This leaves fifty-five percent (55%) of the original structure, indicating that the structure is feasible for rehabilitation. This calculation will be performed by the HRS. Should significant deterioration occur between application approval and the time the unit is scheduled for rehabilitation, the unit will be re-evaluated for continued eligibility and a decision made by the HRS whether to replace it with an alternate unit in accordance with current FDEO contract requirements. M. Cost Feasibility Pertaining to the CDBG and DRI categories, as an additional means of guarding against program penalties for substantial reconstruction of a dwelling, the following cost limits are applicable to all rehabilitation areas. These limits are above the allowable CDBG financing limits, and assume requirements for owner contributions or leveraging with other funding sources. The limits may be exceeded for rehabilitation/replacement costs when alternative funds are available for leveraging, but must be specifically approved by the County Commission or PA as exceeding the described limits. 1. $80,000 per single family detached house (CDBG and DRI) 2. $50,000 per unit of a duplex, Townhome, or Condominium unit (DRI) 3. $20,000 per mobile home unit built after Jan. 1, 1997( DRI) In addition, for the CDBG and DRI categories, the cost of rehabilitation and improvements may not exceed the after -rehabilitation value of the dwelling. In the absence of conflicting information, the mobile home DRI cost limits shall be assumed to meet this requirement. For site -built dwellings, the total cost of rehabilitation (plus other improvements, if any) may not exceed eighty dollars 44