This three-story plant was designed in 1905 by Detroit architect George D. Mason and built by Julius Kahn’s Truscon and Concrete Steel & Tile Company. Commissioned by Henry Leland’s Cadillac Motor Car Company, it replaced Cadillac’s original factory that had burned down in 1904.

Mason’s use of reinforced concrete was groundbreaking, providing fire protection, resistance to vibration, and larger open floors and windows for production. Completed in just 67 days, it became the first reinforced-concrete auto factory in Detroit, predating Albert Kahn’s famous Packard Plant Building No. 10, often mistakenly credited with that milestone.

Cadillac produced cars here until 1920, when operations moved to a larger facility. The building later housed Rose Realty and Westcott Paper Products, which occupied it until 2022. In 2024, work began to transform the site into 90 loft apartments, with 20% reserved as affordable housing. The $26 million project, led by Greatwater Opportunity Capital, opened on Sept. 17, 2025. The redevelopment preserves the historic exterior while introducing modern amenities such as a gym, gated parking, bike storage, and outdoor patio space.