Johnston City Hall

OPN Architects

Recognitions: 2024 AIA Iowa Impact Award, AIA Iowa 2024 Design Awards

Project Description

This new city hall is situated as the civic core of a new town center development in a growing mid-western suburb. The new facility combines municipal office functions with community spaces inside and out. The buildings’ cross-axial layout features a central lobby that connects interior community spaces such as the council chambers, training room, and conference rooms to the municipal offices, both open and private. Materials inside and out reflect the city hall’s purpose, while also representing the community and site specifically. Limestone, wood, and metal on the exterior imbue civic permanence while emphasizing the building’s warmth and openness. This same palette carries through to the interior to clarify the building’s organization and reinforce the interior/exterior connection. The architecture and scale of elements reflect the city’s early formation around a railroad station. Exterior double columns, for example, are organized around the historic railway system and the width of railroad components. Walnut, oak and ash trees cleared from the site were used to construct the reception desk, council dias, lobby walls, workstations, and interior signage. The building was designed as an example for the community - to drive innovation, conserve energy, and utilize sustainable materials. Both the building and the site support community growth and expansion with flexibility to accommodate evolving needs. Spaces such as the large “front porch” of the city hall can host various types and sizes of events and is surrounded by site amenities such as a splash pad, a skating rink, a bicycle pump track and large open green spaces. The building becomes a backdrop for a site that acts as a front yard for the community, serving as a forum, plaza, amphitheater, market and events space to welcome and support its community.