The Chicago City Council approved the historical landmark designation for the St. Adalbert Church Building located at 1650 West 17th Street in Chicago, Illinois, on June 18, 2025. The designation covers the exterior elevations, including rooflines and towers, of the former St. Adalbert Church Building, and includes a ten-foot buffer surrounding the structure. The landmark designation excludes the building's interior and a single-story accessory building north of the rectory. The St. Adalbert Parish Complex, which originally included the church, rectory, convent, and school buildings at 1622-58 West 17th Street and 1633-59 West 16th Street, was initially considered for landmark status as a whole. However, the City Council, following the Commission's recommendation, decided to designate only the Church Building, citing its importance and to prevent further vacancy and neglect if the entire complex was designated, which would hinder feasible redevelopment. The Church Building, designed by Henry J. Schlacks, is a significant example of late nineteenth and early twentieth-century ecclesiastical Renaissance Revival architecture, noted for its ornate façade, twin bell towers, and use of granite, limestone, and terra cotta. It exemplifies Chicago's architectural heritage, the history of Polish and Mexican immigration in the city, and the role of religious institutions in neighborhood development. The Commission on Chicago Landmarks recommended the designation on June 6, 2024, after determining the complex met four criteria for landmark status under the Municipal Code. The ordinance mandates the creation of a plaque to identify the Church Building as a Chicago Landmark. Future work within the ten-foot buffer must ensure no adverse effect on the church's historical and architectural features. Any damage to the Church Building from demolition or renovation of other complex buildings will be the owner's responsibility to repair.