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Philadelphia Wholesale Drug Company Building is a historic warehouse building located in the Callowhill neighborhood of Philadelphia, Pennsylvania. It was built in 1927, and is a seven-story, seven bay by five bay, reinforced concrete building with brick and cast stone facing. It measures approximately 190 feet by 112 feet. It was built by the Philadelphia Wholesale Drug Company Building, one of the first druggist cooperatives in the United States.It was added to the National Register of Historic Places in 1990.

Terminal Commerce Building, also known as the North American Building, is a historic building complex located in the Callowhill neighborhood of Philadelphia, Pennsylvania. It was built between 1929 and 1931 by the Reading Company, and is a combined office, showroom, parking garage, warehouse and freight station totaling over 1.3 million square feet. It measures 528 feet by 225 feet. The front section houses offices, and is a 14-story, reinforced concrete, brick and terra cotta faced building in the Art Deco style. The front facade has a central tower with terra cotta ornamentation that houses water tanks. The rear warehouse section is 12-stories and is "H"-shaped.It was added to the National Register of Historic Places in 1996. It is a contributing property to the Callowhill Industrial Historic District. Today, the building serves as one of the largest interconnection and colocation facilities on the east coast of the United States with 11 stories and 1.3 million square feet of space. The property was acquired by Netrality Properties in March 2014, and is considered the most fiber-dense, network neutral facility between New York and Virginia.

Spring Garden Street station was a train station in the Poplar neighborhood of Philadelphia. It was built by the Reading Railroad and located on the Reading Viaduct. Service to Spring Garden Street ended in 1984 with the opening of the Center City Commuter Connection, which bypassed the Reading Terminal, and the building was demolished in 2021.

Spring Garden station is an abandoned subway rapid transit station on the SEPTA Broad–Ridge Spur, located under Ridge Avenue between Spring Garden Street and Buttonwood Street. The Broad-Ridge Spur, including Spring Garden station, opened on December 21, 1932. By the late 1980s, Spring Garden station was lightly used and exit-only; it was frequently occupied by drug users and dealers. After no substantial opposition from nearby residents, SEPTA closed the station on September 10, 1989. The now abandoned station, visible from passing trains, is heavily graffitied. A single entrance, covered with steel, is still present on the west side of Ridge Avenue just north of Buttonwood Street.

Callowhill is one of the unofficial names for a neighborhood in Philadelphia, Pennsylvania, located roughly in the vicinity of Callowhill Street, between Vine Street, Spring Garden Street, Broad Street, and 8th Street. The name "Callowhill" was coined by the Callowhill Neighborhood Association, a community organization in the area; although this name often appears on online maps, the City of Philadelphia does not have an official name for this area. Callowhill is named for Callowhill Street, which was named after Hannah Callowhill Penn, William Penn's second wife. Callowhill was formerly home to large-scale manufacturing and other industries, of which an architectural history has been left in the form of grand old abandoned factories. During the 1970s and 1980s, the population of Callowhill plummeted, and although numbers are rising, it is a fairly unpopulated section of the city compared to surrounding neighborhoods. Recently developers have started to employ adaptive reuse projects, converting them into loft style housing; so much so that many have termed the neighborhood "The Loft District". In 2010 the Callowhill Industrial Historic District was added to the National Register of Historic Places.Callowhill is physically cut off from its neighbor to the south, Chinatown, by the Vine Street Expressway. This has largely prevented Chinese businesses from spreading north, although some industrial and storage uses by the Chinese community have been placed in Callowhill. Vine Street is also blamed for the abrupt drop in pedestrian life above Chinatown, and the struggle faced by efforts to redevelop this section of the city that lies between Center City and North Philadelphia. The former Reading Railroad train trestle, the Reading Viaduct, is a defining feature of the Callowhill neighborhood. Neighborhood groups have proposed that the abandoned structure be maintained as a public park. The Reading Viaduct park plan gained momentum in 2009 when Philadelphia's Center City District (CCD), and its influential president Paul Levy, became enamored of the idea and ultimately became a partner to help manage the project. CCD announced on Tuesday, February 6, 2018 that the first phase of the quarter-mile-long, elevated park would open in spring 2018. The actual grand opening of The Rail park was held on June 14, 2018, attracting a large crowd.Philadelphia Traffic Court is in Callowhill, at Spring Garden Street and North 8th Street.

Smaltz Building, also known as the Smaltz-Goodwin Building, is a historic factory building located in the Callowhill neighborhood of Philadelphia, Pennsylvania. It was built in 1911, and is a 10-story, 11 bay by five bay, reinforced concrete building. It originally housed the Smaltz-Goodwin women's shoe manufacturer until 1933, then a variety of clothing manufacturers.It was added to the National Register of Historic Places in 2005. It is a contributing property to the Callowhill Industrial Historic District. Between 2012 and 2016 the Post Brothers development company rehabbed the Smaltz Building into the first LEED Gold certified residential high-rise in Philadelphia, opening the building as The Goldtex apartment community in January 2016.

Spring Garden School is a public K-8 school in the Poplar neighborhood of Philadelphia, Pennsylvania. It is a part of the School District of Philadelphia. The historic school building originally housed Spring Garden School No. 2. It was designed by Irwin T. Catharine and built in 1930–1931. It is a three-story, 16 bay orange brick building in the Art Deco-style. It features corbelled brick pilasters with capitals adorned by floral motifs and a caged rooftop play area.It was added to the National Register of Historic Places in 1986.The Spring Garden attendance boundary includes a portion of the Center City District just north of the traditional boundary of Center City. Residents zoned to Spring Graden are zoned to Benjamin Franklin High School. As of 2016 over 70% of students who graduate from Spring Garden instead go to special admission and magnet schools such as Bodine High School for International Affairs, Carver High School for Science and Engineering, Constitution High School, Parkway High School, and Philadelphia High School for Girls.

The Reading Viaduct, also called The Rail Park, is a disused elevated rail line in the Callowhill district of Philadelphia that has been partly transformed into a rail trail. In 2010, the Center City District and a new community organization, Friends of the Rail Park, began to evaluate options to convert the abandoned viaduct into an elevated park.On October 31, 2016, construction began on the plan's Phase 1, which added a boardwalk, benches, landscaping, and swings along a quarter-mile (400-meter) section of the viaduct from Broad Street to Callowhill Street; it also reinforced the existing 13th street bridge. The Phase 1 section opened to the public on June 14, 2018.

Parkway Center City Middle College is a historic vocational school located in the Callowhill neighborhood of Philadelphia, Pennsylvania. It is part of the School District of Philadelphia. The building was built in 1925–1927 and is a brick building in the Academic Gothic-style. Prior to its current status Parkway Center City Middle College was known as Parkway Center City and was located at 1118 Market Street. The school served as a division of the former Parkway Program, a school without walls program. Also, this building was the former Stoddart-Fleischer Junior High School and later Middle School until it closed in June 2003. Parkway Center City Middle College is the first high school in Pennsylvania to present intellectuals with the possibility of finishing high school with a high school diploma and an associate degree. Working in partnership with the Community College of Philadelphia, our students are given unparalleled access to dual enrollment classes, with a maximum of 61 college credits available to some scholars throughout their high school careers. The building was added to the National Register of Historic Places in 1986 as the Helen Fleischer Vocational School.

Guild House is a residential building in Philadelphia which is an important and influential work of 20th-century architecture and was the first major work by Robert Venturi. Along with the Vanna Venturi House it is considered to be one of the earliest expressions of Postmodern architecture, and helped establish Venturi as one of the leading architects of the 20th century.The building, which houses apartments for low-income senior citizens, was commissioned by a local Quaker organization, Friends Rehabilitation Program, Inc. and completed in 1963. Employing a combination of nondescript commercial architecture and ironic historical references, Guild House represented a conscious rejection of Modernist ideals and was widely cited in the subsequent development of the Postmodern movement.

Thaddeus Stevens School of Observation is a historic school building located in the Poplar neighborhood of Philadelphia, Pennsylvania. It was designed by Irwin T. Catharine and built in 1926–1927. It is a five-story, brick building on a limestone base and grade-level basement in the Late Gothic Revival-style. It features a projecting entrance bay with Gothic arch opening, round arched openings, and decorative spandrel panels. It was used as an "observation school" for teacher education and training. It is named for Congressman Thaddeus Stevens (1792–1868). The building was added to the National Register of Historic Places in 1988. The school has since closed and been turned into lofts. In 1998 Philadelphia based mural artist Meg Saligman painted the iconic mural "Common Threads," wherein she depicts a humanity shared across time, today's youth paralleled with classical figures. All models for the mural were local high school students.

Poplar is a neighborhood in Lower North Philadelphia. It is located north of Callowhill, between Spring Garden/Fairmount and Northern Liberties, bounded roughly by Girard Avenue to the north, North Broad Street to the west, Spring Garden Street to the south, and 5th Street to the east. The neighborhood is mostly residential with commercial frontage on Broad Street and Girard Avenue and some industrial facilities to the west of the railroad tracks along Percy St. and 9th St.