Sonneborn Factory interior
View of Henry Sonneborn and Company garment workers sewing clothing by hand. The Henry Sonneborn and Company was a clothing manufacturing business founded by Henry Sonneborn (1826-1917), a German immigrant who arrived in the United States at age 22. Constructed in 1905, the building was designed by architects Otto Simonson and Theodore W. Pietsch and was located on the northwest corner of Pratt and Paca Streets in downtown Baltimore, Maryland. The neoclassical-style building was nine stories tall and considered fireproof. Then known as the nation's largest clothing factory, Henry Sonneborn and Company turned out 3,000 men's suits per day.