Admisi is a building that applies the Green Building principle. There are energy saving equipment used in Admisi Building, such as LED lights, Air Conditioner (AC) that use VRF tecnology, and electronic equipment. That is included in the type of non-linear load that can cause harmonics. In this study , harmonic measurement on the Sub Distribution Panel in Admisi building and know that measurement value of Total Harmonic Distortion current and voltage at the Admisi Building exceeds the standard limit specified by the IEEE standar 519-1992. One of the effects of harmonics can cause power losses and economic loss from these power losses. After analyzing the THD value that exceeds the standard result in losses of 438, 0576 kWh per year, or economically Rp. 547.394 per year. Based on the result of research and data analysis, to reduce harmonic, a single tuned passive filter is planned. In the planned cost estimation and investment feasibility study. The estimated cost for the installation of single tuned passive filter is Rp. 30.313.400.