Garrison Foundry-Mackintosh Hemphill Company Offices located at 901-911 Bingham Street in the South Side Flats neighborhood of Pittsburgh, Pennsylvania

Pittsburgh, Pennsylvania

Pittsburgh is the second-largest city in the US Commonwealth of Pennsylvania and the county seat of Allegheny County. Regionally, it anchors the largest urban area of Appalachia and the Ohio River Valley, and nationally, it is the 22nd-largest urban area in the United States...

, were built from 1895 to 1902. This Greek Revival

Greek Revival architecture

The Greek Revival was an architectural movement of the late 18th and early 19th centuries, predominantly in Northern Europe and the United States. A product of Hellenism, it may be looked upon as the last phase in the development of Neoclassical architecture...

 styled building was the first building built on the former St. Mary's Parish Complex. These yellow brick buildings were part of the A. Garrison Foundry Co., later the Mackintosh-Hemphill Co., which produced basic iron

Iron

Iron is a chemical element with the symbol Fe and atomic number 26. It is a metal in the first transition series. It is the most common element forming the planet Earth as a whole, forming much of Earth's outer and inner core. It is the fourth most common element in the Earth's crust...

 and steel

Steel

Steel is an alloy that consists mostly of iron and has a carbon content between 0.2% and 2.1% by weight, depending on the grade. Carbon is the most common alloying material for iron, but various other alloying elements are used, such as manganese, chromium, vanadium, and tungsten...

 equipment from the 1870s to the 1980s. The plant equipped dozens of mills

Steel mill

A steel mill or steelworks is an industrial plant for the manufacture of steel.Steel is an alloy of iron and carbon. It is produced in a two-stage process. First, iron ore is reduced or smelted with coke and limestone in a blast furnace, producing molten iron which is either cast into pig iron or...

 in the United States and abroad, including U.S. Steel

U.S. Steel

The United States Steel Corporation , more commonly known as U.S. Steel, is an integrated steel producer with major production operations in the United States, Canada, and Central Europe. The company is the world's tenth largest steel producer ranked by sales...

's Homestead Works

Homestead Steel Works

Homestead Steel Works was a large steel works located on the Monongahela River at Homestead, Pennsylvania in the United States. It developed in the nineteenth century as an extensive plant served by tributary coal and iron fields, a railway long, and a line of lake steamships...

, which was conceived, designed, constructed and equipped by James Hemphill. At least one of the Mackintosh-Hemphill buildings (the building on the corner) is attributed to Longfellow, Alden & Harlow

Longfellow, Alden & Harlow

Longfellow, Alden & Harlow , of Boston, Massachusetts, and Pittsburgh, Pennsylvania, was the architectural firm of Alexander Wadsworth Longfellow, Jr. , Frank Ellis Alden , and Alfred Branch Harlow . The firm, successors to H. H...

. The foundry was added to the List of City of Pittsburgh historic designations on December 30, 2008.