[2] 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.

[3] 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.

[5] Callowhill is physically cut off from its neighbor to the south, Chinatown, by the Vine Street Expressway.

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.

[9] CCD announced on Tuesday, February 6, 2018 that the first phase of the quarter-mile-long, elevated park would open in spring 2018.