Henry Hornbostel was an American architect and educator. Hornbostel designed more than 225 buildings, bridges, and monuments in the United States. Twenty-two of his designs are listed on the National Register of Historic Places, including the Oakland City Hall in Oakland, California and the Soldiers and Sailors Memorial Hall and Museum and University Club in Pittsburgh, Pennsylvania.

Oakland City Hall is the seat of government for the city of Oakland, California. The current building was completed in 1914, and replaced a prior building that stood on what is now Frank H. Ogawa Plaza. Standing at the height of 320 feet (98 m), it was the first high-rise government building in the United States. At the time it was built, it was also the tallest building west of the Mississippi River. The City Hall is depicted on the city seal of Oakland.