Union Trust Building (Pittsburgh)

The Omni William Penn Hotel is a 23 floor (3 underground) hotel located at 530 William Penn Place on Mellon Square in downtown Pittsburgh, Pennsylvania. A variety of luminaries have stayed at the hotel, including John F. Kennedy. The hotel staff innovated Lawrence Welk's now famous bubble machine, and it was the site of Bob Hope's marriage proposal in 1934. The hotel has won numerous awards including being named to the "Best of Weddings 2009" list by The Knot and receiving the Editor's Choice Award in the Business Hotels category on Suite101.com. Omni William Penn Hotel, Pittsburgh is a member of Historic Hotels of America, the official program of the National Trust for Historic Preservation.The hotel also features an award-winning restaurant that dates from 1916, the Terrace Room, featuring among other amenities a wall long mural entitled "The taking of Fort Pitt". The Terrace Room was voted "Best Hotel Dining" establishment in both 2008 and 2009 by readers of the Pittsburgh City Paper.

The Carnegie Building, also known as the Carnegie Steel Building, was a high-rise building in Pittsburgh, Pennsylvania.

525 William Penn Place (also known as the Citizens Bank Tower) is a skyscraper located in downtown Pittsburgh, Pennsylvania. It was completed in 1951 for the Mellon National Bank and the U.S. Steel Corporation. At 520 feet (160 m) tall, it was the second-tallest building in Pittsburgh until 1970, and the third-tallest until 1984. The building has 41 floors and approximately 950,000 square feet (88,000 m2) of office space. Presently it is the third-largest office building by square feet in downtown Pittsburgh. In 2016, BNY Mellon sold the building for $67.65 million.

Carnegie Learning, Inc. is a provider of K-12 education solutions and services for math, literacy and ELA, world languages, and applied sciences. Carnegie Learning, Inc. is located in the Union Trust Building in Pittsburgh, PA.

BNY Mellon Center is a 55-story skyscraper located at 500 Grant Street in downtown Pittsburgh, Pennsylvania. Standing 725 ft (221 m) tall, it is the second-tallest building in the city. Announced on March 27, 1980, the tower was completed in June 1984. It was initially planned to be the world headquarters of the Dravo Corporation (now Carmeuse Corporation) by its majority owner at the time and current neighbor U.S. Steel until Dravo was purchased in 1983. Upon opening, the building was named One Mellon Center after Mellon Financial Corporation, which used the tower as the company's global headquarters. In 2007, the company merged with Bank of New York to form The Bank of New York Mellon; the resulting corporation continues to use the building as one of its major offices. In 2008, the building was renamed to its current moniker as part of a branding initiative by The Bank of New York Mellon.Prominent features of the building include its eight-sided design and mansard roof. The tower is connected to the U.S. Steel Tower through a tunnel which passes through Steel Plaza subway station. BNY Mellon Center is the ninth-tallest building in Pennsylvania (as well as the second-tallest within the state outside of Philadelphia) and 195th-tallest skyscraper in the world, and also the building with the highest taxable property value in Allegheny County, surpassing even the U.S. Steel Tower. On clear days, it is possible to spot the building from as far as 50 miles away, usually from the top of Chestnut Ridge.

The Frick Building is one of the major distinctive and recognizable features of Downtown Pittsburgh, Pennsylvania, United States. The tower was built by and is named for Henry Clay Frick, an industrialist coke producer who created a portfolio of commercial buildings in Pittsburgh. The building is listed on the National Register of Historic Places. The tower was built directly adjacent to a building owned by his business partner and rival Andrew Carnegie, on the site of Saint Peter Episcopal Church. Frick, who feuded with Carnegie after they split as business associates, had the building designed to be taller than Carnegie's in order to encompass it in constant shadow.The Frick Building was opened on March 15, 1902 and originally had twenty floors. It was the tallest building in the city at that time. A leveling of the surrounding landscape that was completed in 1912 caused the basement to become the entrance, so some sources credit the building with twenty-one stories. It rises 330 feet (101 m) above Downtown Pittsburgh. Its address is 437 Grant Street, and is also accessible from Forbes and Fifth Avenues. The building's architect was Daniel H. Burnham of D.H. Burnham & Company, Chicago. Of the eleven executed designs for Pittsburgh by D.H. Burnham & Company, the Frick Building is one of only seven survivors.The top floor, which was reserved for The Union Club of Pittsburgh, includes a balcony around the perimeter of the building, a high, handcrafted ceiling, and heavy, elaborate brass door fixtures. Originally, H.C. Frick used it as his personal office and as a meeting place and social club for wealthy industrialists. On the 19th floor was Frick's personal shower. At the time, no other shower had been built that high above ground level, because water could not easily be pumped that high with the technology of the time. The shower, non-functioning, still exists on the 19th floor today. Fittingly for a building created for a man who vowed to be a millionaire by age thirty, the lobby features an elegant stained-glass window by John LaFarge, depicting "Fortune and Her Wheel" (1902). The two bronze sentinel lions (1904) in the lobby were created by sculptor Alexander Proctor. A bust of Frick by sculptor Malvina Hoffman (1923) is displayed in the rear lobby, which extends from Forbes to Fifth Avenue.For a time, the building was home to the headquarters for Frick's family whiskey business, Old Overholt. The headquarters oversaw a network of sales offices around the United States.

Mellon Square is an urban park in Downtown Pittsburgh, Pennsylvania. It is the first Modernist park built above a parking garage. With its distinctive black, white and green geometric pavement, it is a prominent urban oasis and gathering spot in Downtown Pittsburgh. The square, bounded by Smithfield Street, William Penn Place, and Oliver and Sixth Avenues, is surrounded by prominent downtown buildings including the Oliver Building, 525 William Penn Place, Omni William Penn Hotel, and the Regional Enterprise Tower. It has long been a popular lunchtime destination for downtown workers. In addition, retail shops are housed underneath it, along the Smithfield Street side of the square.

Steel Plaza is a station on the Pittsburgh Regional Transit's light rail network, located in Pittsburgh, Pennsylvania. It serves the city's Downtown district and is located at the intersection of Grant Street and Oliver Avenue. The station consists of an outbound (southbound) side platform and an inbound island platform, with one track for trains to Wood Street and the other for a disused branch line to Union Station. The station has rights to 4.25 acres underground Mellon Green and is accessible by means of a tunnel that connects BNY Mellon Center and the US Steel Tower. The busiest station in the system, it provides access to eastern and central portions of downtown, including the city's tallest buildings, the US Steel Tower and BNY Mellon Center. Major office buildings including the Gulf Tower, 525 William Penn Place, and the Koppers Building are also only a block away, along with the many early 20th-century skyscrapers that make up downtown's inner core. The city's Uptown (commonly known as The Bluff) neighborhood, which includes PPG Paints Arena and Duquesne University is also within a short walk.

The Pittsburgh & Steubenville Extension Railroad Tunnel, also known as the Panhandle Tunnel, was originally built for the Pittsburgh and Steubenville Extension Railroad in Pittsburgh. It officially opened for rail traffic in 1865.

Mellon National Bank Building (also known as Lord & Taylor Department Store) at 514 Smithfield Street in downtown Pittsburgh, Pennsylvania, was completed in 1924 after Mellon acquired the property in August 1916 from the Baltimore & Ohio Railroad which had their regional offices on the site. Prior to the B&O office the site was the original home to the city's first public high school (Central High) which opened in the fall of 1855. The Classical styled building was designed by architects Trowbridge & Livingston with Edward Mellon. It was added to the List of Pittsburgh History and Landmarks Foundation Historic Landmarks in 1976, and the List of City of Pittsburgh historic designations in July 1999.On July 30, 1999, May & Co. bought the structure for $9.250 million from Mellon ending branch services at the site. The building was converted into a multi-level department store despite the protests of historical preservationists. It opened as Lord & Taylor on November 1, 2000, after a $12 million refurbishment (18.9 million in 2021 dollars).On May 31, 2012 PNC Financial Services purchased the structure after Lord & Taylor closed in 2004.

The Alcoa Building (a.k.a. the Regional Enterprise Tower) is a 410-foot-tall (120 m) skyscraper in Downtown Pittsburgh, Pennsylvania. It was completed in 1953 and has 31 floors. It is the 15th tallest building in the city and is adjacent to Mellon Square. A unique radiant heating and cooling system is contained in the ceiling: since there are no pipes, radiators, or air conditioning units along the exterior walls, an additional 15,000 square feet (1,400 m2) of rentable space was gained. Also, the windows rotate 360 degrees so they can be washed from the inside.Originally the headquarters for the Aluminum Company of America (ALCOA), the unique aluminum walls of the building are 1/8 inch thick, which gives the building a very light weight and economical design. It was the first skyscraper with an all-aluminum facade. Upon ALCOA's 2001 relocation to a new headquarters building on Pittsburgh's North Shore near PNC Park, the old ALCOA Building became a home to government entities, regional nonprofits and small start-up companies including the RIDC.

The Pittsburgh Central Downtown Historic District is a historic district in the Central Business District of Pittsburgh, Pennsylvania, United States. Bounded by Wood Street, Forbes Avenue, Grant Street, and Liberty Avenue, it was listed on the National Register of Historic Places on December 17, 1985. Its boundaries were expanded on May 2, 2013.The original district includes 26 buildings, 20 of which are considered contributing including a few small former residences built in the mid-19th century. The Frick Building and U.S. Post Office and Courthouse are contributing properties and are also listed separately on the National Register of Historic Places. Other notable contributing properties are the Gulf Tower, the William Penn Hotel, the Oliver Building, Mellon Square, the August Wilson Center, the Federal Reserve Bank Branch, Gulf Tower, the Frank & Seder Building, the Koppers Building and Trinity Cathedral.