[4] The original routing of the tracks curved around the foundations of the ornate City Hall building above, but was rebuilt into a straightened alignment in the mid-1930s in an effort to improve travel time.

Following this, a lawsuit was filed by the Disabled in Action of Pennsylvania, citing that renovating only one critical component would require the rest of the station complex (including the City Hall station on the Broad Street Line) to be renovated for ADA accessibility as per building code requirements.

[7] In November 2011, the Central Philadelphia Development Corporation awarded construction contracts totaling $50 million for the restoration of the Dilworth Park above the station, following the eviction of the Occupy Philly protesters occupying the area; the contract includes making the park accessible to people with disabilities.

The project, originally to have been completed July 2014, had been delayed due to the necessity to deal with stairways, duct banks and pipes construction crews encountered, that did not appear in any blueprints.

[11] In 2013, the passage of PA Act 89 (Transportation Funding Law) has allowed SEPTA to move forward with the $147 million BLT Architects-designed renovation of the 15th Street/City Hall station complex.

Due to the rebranding of the Market–Frankford and Broad Street lines ("MFL" and "BSL") with the adoption of SEPTA Metro, both station names were updated to 15th Street/City Hall on February 23, 2025.

The two inter track are for B2 express service to Walnut-Locust(Southbound)/NRG stadium complex(Sports Express) Fern Rock Transit Center(Northbound), while the 2 outer tracks are served by the B1 local service to NRG stadium complex (Southbound) Fern Rock Transit Center (Northbound).