The TNB Headquarters building in Kuala Lumpur serves as the main office and headquarters for Tenaga Nasional Berhad, Malaysia's largest electric utility company. Built in the 1960s, the 11-story building houses offices, meeting spaces, and amenities for TNB staff. Spatially, the building is organized with offices and departments arranged by floor. Circulation is primarily via a central spiral staircase, with emergency staircases also provided. The top floor penthouse serves as a VIP area with reception, dining, and presentation facilities.