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For decades, Terrace Hill embodied Allen’s remarkable ascent from orphan to wealthy industrialist. His home towered over Des Moines, and residents often gazed up at the mansion’s imposing silhouette. As the city expanded westward, the mansion, once at the edge of town, became centrally located. In many ways, the estate represented the opulence of Des Moines’ golden era—a testament to Allen's entrepreneurial spirit and societal ambition.