In this paper, cracks of concrete proceeded from corrosion of reinforcements are analyzed as indices of super long-term combined deterioration processes of RC building groups with finishing materials, pre-induced cracks and maintenance. Specifications for finishing materials are systemized by permeability, deterioration mechanism, deterioration speed and demeanor after repairs and Agent Base Modelling is adopted about decision-making for building specifications. It is clarified that the average acceleration period arrival rates vary in line with the characteristics of each scenario and are less than repair limits for the group and are one second of 3 upper confidence limits.