Question: The Pitcairn Building was originally built as a regional center for a company that supplies what items?

Context paragraphs:
Herring Motor Car Company Building: The Herring Motor Car Company Building, also known as 10th Street Lofts, is an historic building located in downtown Des Moines, Iowa, United States.  The building is a six-story brick structure that rises 90 ft above the ground.  It was designed by the Des Moines architectural firm of Proudfoot, Bird & Rawson in the Classical Revival style.  Clyde L. Herring had the building built in 1912 and it was completed the following year.  It was originally a four-story building and two more floors were added 18 months after it was originally built.  By 1915 the company was building 32 Ford automobiles a day, and had delivered “more automobiles than any other one automobile agency in the United States”.  Along with the neighboring Standard Glass and Paint Company Building it is part of the same loft apartment complex.  The National Biscuit Company Building on the other side of the building has also been converted into an apartment building.  It was listed on the National Register of Historic Places in 2004.

75 Rockefeller Plaza: 75 Rockefeller Plaza is a skyscraper in New York City, originally built as an extension to Rockefeller Center.  It was completed in 1947 in early Modernist style.  It was originally the Esso Building, built for the Standard Oil Company (Esso).  At completion it was the tallest completely air-conditioned building in New York City, and the first one in Rockefeller Center.  After Standard Oil's successor, Exxon, moved to the newly built 1251 Avenue of the Americas, the building became known as the Time Warner Building, after the Time Warner media conglomerate, until they moved to the Time Warner Center.  It is owned by Mohamed Al Fayed and managed and leased by RXR Realty.

Schoolfield School Complex: Schoolfield School Complex is a complex of historic school buildings located at Danville, Virginia.  The complex consists of Building A, built in 1912 or 1913, Building B, built in 1936 or 1937, and Building C, built in 1939 or 1940.  Building A is a 2 1/2-story, Prairie School style brick building with deep eaves that cap a narrow elongated structure, multi-paned massed windows, and horizontal masonry banding.  It has an entry tower and addition built in 1933.  Building B is a vernacular brick building that operated as a vocational center.  Building C is a one-story, brick Colonial Revival style elementary school building.  It was originally built as a Public Works Administration project and housed Schoolfield High School.  The complex was built by the Riverside & Dan River Cotton Mill Company as part of the mill worker neighborhood called “Schoolfield Village.”

PPG Industries: PPG Industries, Inc. is an American Fortune 500 company and global supplier of paints, coatings, specialty materials, and fiberglass.  With headquarters in Pittsburgh, Pennsylvania, PPG operates in more than 70 countries around the globe.  By revenue it is the largest coatings company in the world.  It is headquartered in PPG Place, an office and retail complex in downtown Pittsburgh, and is known for its glass facade designed by Philip Johnson.

Roundup Central School: The Roundup Central School is a historic school located at 600 1st Street West in Roundup, Montana.  The west wing of the school was completed in 1911, while the east wing was completed in 1913.  The school was the third building used as a public school in the city; however, it was the first school of considerable size, as the earlier schools had held two and four rooms respectively.  The large sandstone building was one of many civic improvements completed in Roundup in the late 1900s and early 1910s, and it served as both a symbol of the city's growth and a sign of its commitment to becoming an established city and regional center.  As the region's economy declined due to drought conditions in the late 1910s and 1920s, Roundup's population remained stable due to its status as a regional service center, a role which partly stemmed from the school.  As a wave of consolidation closed many nearby schools in the following decades, Roundup both stayed open and absorbed many other districts; it became the largest school district in Musselshell County and cemented its status by absorbing the Klein school district, then the second-largest in the county, in 1959.

Claremont City Hall: Claremont City Hall, also known as the Claremont Opera House, is located at 58 Opera House Square in the heart of Claremont, New Hampshire, United States.  The monumental Italian Renaissance Revival two-story brick and brownstone building was designed by New York City architect Charles A. Rich, an alumnus of nearby Dartmouth College, and built between 1895 and 1897.  Hira R. Beckwith, an architect in Claremont, was the contractor.  Many of the construction materials for the building came from the surrounding region.  The foundation consists of Green Mountain rock, and the base was dressed Connecticut River brownstone from Springfield, Massachusetts.  The major part of the exterior is built from nearly one million bricks from Lebanon, New Hampshire.  The original design of the building included first floor that housed a meeting space seating 700, while the upper floor housed the "opera house" (auditorium), which seated nearly 1,000 and included a stage adequate for mounting theatrical productions.  Rich and Beckwith spent two years and $62,000 to construct the building as a regional center for entertainment, cultural, community and political events.  The building was dedicated on June 22, 1897.

Cañon City Municipal Building: The Cañon City Municipal Building is the current home of the Royal Gorge Regional Museum and History Center.  It was originally built as a government building for the city of Cañon City, Colorado.  A new City Hall building was built to allow more room for city offices and a larger city council meeting room leaving the vacated space available to an expansion of the museum and the relocation of the History Center from the Cañon City Public Library's basement to the Municipal Building.  It was then decided to rename the building the Royal Gorge Regional Museum and History Center.

Pitcairn Building (Philadelphia): The Pitcairn Building, also known as the Pittsburgh Plate Glass Company Building, is a historic warehouse and light manufacturing loft building located at 1027 Arch Street at the corner of N. 11th Street in the Chinatown neighborhood of Philadelphia, Pennsylvania.  It was designed by noted Philadelphia architects G. W. & W. D. Hewitt and built in 1901.  It is an eight-story, steel frame building clad in brick and granite with terra cotta details.  The building measures approximately 74 feet wide and 172 feet deep.  It was originally built as a regional distribution center for the Pittsburgh Plate Glass Company.  It later housed a clothing manufacturer, H. Daroff and Sons, who originated the "Botany 500" brand.

Downtown Indianapolis: Downtown Indianapolis refers to the central business district of Indianapolis, Indiana, United States.  The boundaries of downtown Indianapolis have varied over time as the city has grown.  The city's original platted area, the Mile Square, (bounded by North, South, East, and West streets) is sometimes used to denote the downtown area.  However, the Indianapolis Regional Center Plan, which is the official plan for Downtown Indianapolis, defines the boundaries to be 16th Street on the north, Interstate 65/70 on the east, Interstate 70 on the south and the Belt Railroad on the west.  The Regional Center therefore encompasses not only the Mile Square, but also the Indiana University – Purdue University Indianapolis campus, White River State Park, and the Eli Lilly and Company corporate headquarters.

Federal Reserve Bank of Richmond Baltimore Branch: The Federal Reserve Bank of Richmond Baltimore Branch Office is one of the two Federal Reserve Bank of Richmond branch offices.  The Federal Reserve Bank of Richmond's Baltimore Branch is an operational and regional center for Maryland, the metropolitan Washington D.C. area, Northern Virginia, and northeastern West Virginia.  The Baltimore branch is part of the Fifth District and has the code E5.  It supports Check 21 operations, supplies coin and currency to financial institutions and works to maintain stability in the financial sector throughout the Fifth District and also works with local elected officials and non-profit organizations to support fair housing initiatives throughout the Fifth District.  The Baltimore branch was founded in March 1918 and is currently headed by William R. Roberts.

Supporting paragraphs: Pitcairn Building (Philadelphia) PPG Industries
Answer: paints, coatings, specialty materials, and fiberglass