Stone Group Architects is proud to announce that the historic preservation and adaptive reuse project completed for the Warnock–Benson Building in downtown Sioux City, Iowa has been honored with the 2026 William J. Wagner Award. Presented by the State Historical Society of Iowa Board of Trustees as part of its Excellence in History Awards program, this recognition reflects the project’s commitment to preserving Iowa’s architectural heritage through thoughtful design, responsible rehabilitation, and long-term community impact.
This honor is especially meaningful as it recognizes a collaborative effort guided by historic preservation best practices, architectural stewardship, and a vision for revitalizing a significant piece of Sioux City’s history for future generations. The recognition has also reflected the project’s adherence to the U.S. Secretary of the Interior’s Standards for Rehabilitation and the strategic use of the State Historic Preservation Tax Credit Program to support the building’s long-term preservation and viability.
A Landmark Recognition in Iowa Historic Preservation
A significant milestone in the preservation of Iowa’s built environment has been marked through this award recognition. The Warnock–Benson Building project, completed in Sioux City, Iowa, has been highlighted as an example of how historic structures can be thoughtfully adapted for continued use while maintaining architectural integrity.The award has been presented through the State Historical Society of Iowa, which oversees statewide efforts to preserve and promote Iowa’s historic resources.
William J. Wagner Award: Meaning and Significance
The William J. Wagner Award has been established to recognize projects, individuals, or organizations that demonstrate excellence in historic preservation practice and long-term contributions to Iowa’s historical landscape.
Although each year’s honorees may vary in scope and scale, the award consistently emphasizes:
- Commitment to historic preservation principles
- Long-term community and cultural impact
- Sensitive rehabilitation of historic structures
- Demonstrated alignment with recognized preservation standards
- Leadership in protecting Iowa’s architectural heritage
In the case of the Warnock–Benson Building, these values have been reflected through a careful balance of preservation and modernization, ensuring the building’s continued relevance within downtown Sioux City’s evolving urban fabric.
Award Requirements and Preservation Standards
Projects considered for this recognition are evaluated through established preservation frameworks, most notably the U.S. Secretary of the Interior’s Standards for Rehabilitation. These standards are widely regarded as the benchmark for historic rehabilitation projects across the United States and are administered by the National Park Service.
Key principles applied throughout the Benson Building project included:
- Preservation of character-defining features wherever feasible
- Compatibility of new interventions with historic materials
- Reversibility of select modern modifications
- Respect for original architectural intent and craftsmanship
- Integration of contemporary building performance requirements without compromising historic integrity
In parallel, the utilization of the State Historic Preservation Tax Credit Program was strategically incorporated to support financial feasibility while encouraging preservation-led development outcomes within Iowa communities.
About the Warnock–Benson Building
The Warnock–Benson Building in downtown Sioux City has long served as a recognizable landmark within the city’s historic core. Through thoughtful historic preservation and adaptive reuse efforts, the building has been transformed into the luxury downtown apartments known as The Benson Lofts with active ground-floor commercial space, ensuring continued use while preserving its architectural character and historic significance. In doing so, the structure has been repositioned as a vibrant mixed-use asset that contributes to both downtown revitalization and long-term preservation goals. A detailed overview of the project can be reviewed here: https://stonegrouparchitects.com/project/historic/sioux-city-iowa/benson-building-adaptive-reuse/
Throughout the design and execution phases, emphasis was placed on:
- Retaining original building materials and façade elements
- Reintroducing usable interior space aligned with modern occupancy needs
- Enhancing building systems for long-term sustainability and performance
- Supporting downtown revitalization efforts in Sioux City
- Preserving the building’s contribution to the city’s historic streetscape
Thank You to Project Consultants and Partners
Historic rehabilitation is a highly collaborative process, shaped by the expertise of many partners working toward a shared outcome. Throughout the lifecycle of the project, consultants, contractors, preservation specialists, and community stakeholders each played an essential role in guiding decisions and supporting execution. This collective effort ensured that preservation standards were upheld while the building was successfully adapted for modern use. In particular, close coordination between structural, mechanical, and preservation disciplines was critical in maintaining both long-term performance and historic integrity.
We are incredibly grateful to all contractors, consultants, and partners who contributed to the success of this project. We are especially appreciative of those who were also recognized in connection with this award, including Nelson Commercial Construction; Jim Jacobsen, Historical Consultant; and Harkay Development LLC.
Advancing Preservation Through Thoughtful Design
This recognition through the 2026 William J. Wagner Award has reinforced the importance of preservation-driven architecture in Iowa and across the Midwest. Through the Warnock–Benson Building historic renovation, it has been demonstrated that historic structures can be responsibly modernized while preserving their cultural and architectural significance.
At Stone Group Architects, continued commitment is maintained toward projects that balance innovation, sustainability, and historic stewardship. As adaptive reuse and preservation efforts continue to grow in importance, work of this nature is expected to remain central to shaping resilient and meaningful communities.
