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This work presents a study of sustainability assessment of building life cycle (LCC). The analysis was conducted, information model developed. The LCC analysis was forecast for 50 years with the following discount rates 4%, 5%, 6%, 8%, 10%, 12% and 13%. The result showed, the lower the discount rates the higher the cost value and via vasa.  The product of net present value (NPV) is &gt; 0, indicating a significant benefit at the end of the study period. The construction cost was 73% of the total forecast costs of the building while operation, maintenance/repair, replacement and decommissioning cost ranks 2%, 8%, 13% and 4% respectively of the building costs. The total forecast life cycle costs ranked 30.24% of the construction cost. The energy costs contributed 54.78% of the total forecast cost. The energy costs were the most cost incurring factor, the use of alternative sources of power supply such as solar will serve as the best and more cost friendly alternative source of energy. The decommissioning costs at the end of CICC building life cycle stand at ₦355,807,000. The study explains a practical analysis on how a life cycle costing of Calabar International Conference Center project was analysed and forecast for a period of 50 years using different discount rates.

Sustainability assessment of building life cycle costing: A case study of Calabar International Conference Center