The existence of a successful internal and global experience in establishing an Energy management system, based on ISO 50001: 2018, is an acceptable method for organizations to reduce their Energy as well as environmental costs. In this standard, the methodology to promote Energy management in organizations is presented. In a sense, improving Energy performance leads to a reduction in consumption and, consequently, the Energy costs are organized as such. On the other hand, as well as raising competitiveness of the organization, and improving its profitability, it also covers part of their environmental commitments. This standard creates a framework for a systematic Energy management in industrial, commercial and governmental organizations/institutions. The Energy baselines, performance indicators, targets and Energy performance monitoring are important parts of this standard. In this study, using actual Energy consumption data and by identifying effective factors influencing on this parameter, a model has been developed for targeting, performance monitoring and compilation Energy bases in an administrative building in Tehran. Results show that the proposed model/methodology and its information can be used in any similar building in any geographic region.