James Reed Building

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.

The Allegheny HYP Club (Harvard-Yale-Princeton Club) is a private social club in downtown Pittsburgh, Pennsylvania. Located at 617-619 William Penn Place, it was built in 1894 and was added to the List of Pittsburgh History and Landmarks Foundation Historic Landmarks in 2002. On July 1, 1997, the club absorbed the Pittsburgh Club membership and assets.The Pittsburgh Harvard-Yale-Princeton Club was formally founded on November 7, 1930. The club merged with the Three Rivers Stadium based Allegheny Club in 2002 after Allegheny had filed for bankruptcy protection.

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 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 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 Bell Telephone Building is a 339-foot (103 m) art deco skyscraper in Downtown Pittsburgh, Pennsylvania. It was completed in 1923 and has 20 floors. It is the 22nd-tallest building in the city.

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.

Koppers Building is a historical building in Pittsburgh, Pennsylvania, commissioned by Andrew W. Mellon and completed in 1929. The building is named after the Koppers Chemical Corporation and is one of the major features of Downtown Pittsburgh.

The Centre City Tower (also spelled Center City Tower) is a 341-foot (104 m) tall skyscraper in Pittsburgh, Pennsylvania. It contains 26 floors, and stands as the 20th-tallest building in the city. Centre City Tower was constructed in 1971, and was later renovated in 2002. The entire building contains Class B office space, and is an example of modern architecture. Signage for Huntington Bank, the building's major tenant, adorns the outside of the structure.

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.

The University of Pittsburgh Medical Center (UPMC) is a $23 billion integrated global nonprofit health enterprise that has 92,000 employees, 40 hospitals with more than 8,000 licensed beds, 800 clinical locations including outpatient sites and doctors' offices, a 3.8 million-member health insurance division, as well as commercial and international ventures. It is closely affiliated with its academic partner, the University of Pittsburgh. It is considered a leading American health care provider, as its flagship facilities have ranked in U.S. News & World Report "Honor Roll" of the approximately 15 to 20 best hospitals in America for over 15 years. As of 2016, its flagship hospital UPMC Presbyterian is ranked 12th nationally among the best hospitals (and first in Pennsylvania) by U.S. News & World Report and ranked in 15 of 16 specialty areas when including UPMC Magee-Womens Hospital. This does not include UPMC Children's Hospital of Pittsburgh which ranked in the top 10 of pediatric centers in a separate US News ranking.

The Union Trust Building is a high-rise building located in the Downtown district of Pittsburgh, Pennsylvania, at 501 Grant Street. It was erected in 1915–16 by the industrialist Henry Clay Frick. The Flemish-Gothic structure's original purpose was to serve as a shopping arcade.