The number of more than thirty-year old condominium is predicted to be increasing drastically. The problem is how the independent renovation of these condominiums in the urban area will be attained. The purpose of this paper is to evaluate the reconstruction-feasibility of old condominiums by reducing the rate which is calculated from "land price based on street value" and "construction cost". By using the evaluation model based on the equivalent exchange, the characteristics of Bunkyo and Koto ward of Tokyo on the reconstruction-feasibility are clearly confirmed. The simulation has been conducted on cases of mixing "a self-pay burden for residents", "alteration in the unit area", and "the diminishing the ratio of the total floor area". With time series analysis, the effects of reducing self-pay expense for each area and case have been confirmed. Architectural Design Office, Construction Dept., Central Japan Regional Branch, Fujita Corporation, M. Eng. The number of more than thirty-year old condominium is predicted to be increasing drastically. The problem is how the independent renovation of these condominiums in the urban area will be attained. The purpose of this paper is to evaluate the reconstruction-feasibility of old condominiums by reducing the rate which is calculated from "land price based on street value" and "construction cost". By using the evaluation model based on the equivalent exchange, the characteristics of Bunkyo and Koto ward of Tokyo on the reconstruction-feasibility are clearly ���������� he simulation has been conducted on cases of mixing "a self-pay burden for residents", "alteration in the unit area", and ��������������������������������������������������������������������� analysis, the effects of reducing self-pay expense for each area and ������������������������