Henry Charles Eitzen Building, also known as the Oscar H. Guether Store Building and Hy. Poppenheusen Tin Shop, is a historic commercial building located at Washington, Franklin County, Missouri. The original section was built about 1854, and is a 2 1/2-story, German Neoclassical style brick building in the Klassisismus form. It has a three-bay, one-story brick ell added before 1893.[2]: 5