The 5th National Building Congress was held on the ZOOM platform with the theme of "Multidimensional Development in the Building Sector: Education-Research-Application" between 9-11 September 2021 by the Building Occupational Scientific Study Board (Yapı MBÇK), which carries out its activities within the scope of the Ankara Branch of the Chamber of Architects of TMMOB.  The experimental study titled "The Effect of Lighting Color Temperature on Performance and Spatial Perception in Office Environment", prepared by Prof Dr Rana Kutlu, one of the faculty members of the Department of Interior Architecture and Environmental Design, and Alperen Kamali, one of our graduate students, was presented at the congress by Alperen Kamali.