The Oklahoma Department of Wildlife Conservation Headquarters Renovation and Expansion was the first major renovation and expansion of the existing facility since the original construction in 1966. The project added roughly 14,000 square feet to the existing 24,000 square foot office building to accommodate a growth in office staff and provides a more energy efficient, modern workplace. Key project challenges included integrating a conventional steel framed expansion to marry up with the original low floor-to-floor height and cast-in-place concrete structure. Additional design challenges included design and detailing of large, cantilevered roof and floor overhangs, new support systems for existing concrete slabs, and a tiered retaining wall at the exterior planter feature.