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This study is aimed at investigating the economics of Intelligent Building Systematization for remolding in deteriorated office buildings. To introduce IBS(Intelligent Building System) into deteriorated office buildings, this study selected the economic HVAC system of 3 alternatives, and evaluated the total cost of BAS(Building Automation System), OA(Office Automation), TC/AV(Tele Communication/Audio Video), SI(System Integration) by IB 4 levels through Life Cycle Costing Method.As a result of this study, in the case of IB Systematization limited BAS for remolding in deteriorated office, the energy saving cost is a half of the initial cost in Life cycle 10 years, but the operator labor saving cost is 1.9~2.5 times to the energy saving cost, the operator labor cost is the principal factor of IB Systematization for remolding in office buildings.