Our 2026 Must-See Michigan Architecture Series will feature Buildings for the Arts from our MAF book “Great Architecture of Michigan”. This summer we will continue this focus as our Road Trip Series will feature Buildings for the Arts throughout Michigan. We hope that throughout the year MAF’s Must-See Michigan Architecture Series is both enjoyable and educational, as we continue to reinforce MAF’s mission of “advancing awareness of how architecture enriches life.”
The Saginaw County Castle Building
A fairy tale French Chateau style Castle located in downtown Saginaw? Most visitors are surprised and often stunned when they discover this magical gem of a building located in the heart of the city. To understand the complete story of this building, we start with the following quote from an article published in the Saginaw Courier Herald on July 3, 1898, to commemorate the grand opening of Saginaw’s newest branch of the United States Post Office.
“Standing complete in all its symmetrical beauty of architecture, majestic in its imposing grandeur, located in one the prettiest elevated sites possible to conjecture, surrounded by nature’s carpet of handsome green that slopes in absolute perfection to the grand nine-foot stone walks, and parks of maple trees, is Saginaw’s new government building – the handsomest one of its dimensions in the United States. Handsome because of its exclusive design, its rich trimmings, its imposing style – not one thing to detract from or mar its symmetry, it is a most fitting companion building to the beautiful Hoyt Library, and the two, with their natural surroundings, form a block that will forever be an emblem of Nineteenth Century grandeur.”
The Saginaw County Castle Building in downtown Saginaw is a beloved landmark and it has been saved twice from demolition through grassroots efforts. Originally constructed to serve as a post office, today it houses the Castle Museum of Saginaw County History.
During this period of time, there was a policy that government buildings should reflect the heritage and climate of the communities in which they were located. The landmark’s architect, William Martin Aiken, decided on the Châteauesque style, which recognized the region’s early French heritage. Noted as a talented designer, Aiken was also politically adept. In his capacity as Supervising Architect of the Treasury, he managed a team of draftsmen who contributed greatly to the design.
Originally the building was a smaller, compact structure and was less than half its current size. Entrances from both South Jefferson and Germania (now Federal) Avenues provided access to a public lobby, an “L” shaped space centered by a dramatic circular staircase in the northwest tower. The space featured groin vaulted ceilings, exposed buff brick walls, oak woodwork, and marble tiled floors.
By the mid-1930s, the post office had become inadequate to serve the community’s needs, and the government proposed construction of a new facility on the site, a proposal met with community-wide opposition. After a campaign by Saginaw residents, a comprise was reached and the building was to be enlarged with additions inspired by the original design. As part of the 1937 project, the Federal Avenue facade was preserved along with two towers. Extensions included a massive new mail sorting room and most interior spaces were reconfigured. The 1898 lobby was replaced by a spacious new public lobby, which was elegantly finished with travertine walls, an oak paneled ceiling, and custom-made light fixtures. The architect for the project was Saginaw architect Carl Macomber and Smith, Hinchman and Grylls of Detroit were associate architects.
In 1964, a new post office was completed on South Washington Avenue, and the old post office, renamed the Castle Station, served as a substation and federal office building. In 1976, with the completion of a new Federal Building, the government’s need for the facility was eliminated. Threatened with demolition, the community again advocated for the preservation of the landmark. The Federal Government transferred the building to the County of Saginaw and in 1979 the Historical Society of Saginaw County opened its museum in the Castle Building.
Although it hasn’t served as a post office since 1976, today the Saginaw County Castle Building still fulfills expectations made by Postmaster General James A. Farley at its rededication on September 30, 1937, “My hope is that this building will long remain as one of usefulness and that it will be a reminder to you and your children of the desire of the federal government to render a service to the people of this community.”
For more information on the Saginaw County Castle Building and the Castle Museum of Saginaw County History: https://www.castlemuseum.org/
Article written by Tom Trombley, Vice President and Chief Historian at the Castle Museum of Saginaw County History.
Photos Courtesy of the Castle Museum of Saginaw County History