The interaction between architecture and the built environment has created a comfortable environmental condition free from external climatic effects with gradual changes and adaptation. This study aimed to investigate the mixed-mode strategy in office buildings of the tropical savanna climate, with a view to enhancing energy efficiency. The study was based on a qualitative method of inquiry using an observational checklist as an instrument of data collection. The key findings were; shading devices, and fenestrations were found to be very effective in the study area. While the recommended window to wall ratio for energy-efficient design was not complied with, in the design and construction of the studied building. The study concludes by recommending that architects need to be conscious in designing fenestrations in office buildings, and also window to wall ratio in their design from the initial stage so as to reduce the effects of intense solar gain into the building interior, especially in tropical climates

Keywords : Architecture, Mixed-Mode Strategies, Office Building, Shading Devices, Energy-Efficiency Design.