For proffer the authorization standard of the act on facilitation reconstruction of deteriorated RC condominium buildings, studied on evaluation methods and criteria about buildings having the risk of falling cover concrete caused by rebar corrosion that exist in a wide. The approach is integrating the deterioration grade of the member of the buildings by visual examination. Through trial and case study used real aging RC condominium buildings, suggested evaluation methods could estimate the grade of rebar corrosion occurred on the exterior of the RC buildings.