A free interchange also provides access to the Market–Frankford Line at 15th Street station, which is connected to City Hall by the Downtown Link underground concourse.

[6] 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.

[8] The project consisted of a restoration of the plaza, creating a "gateway" to the SEPTA transit station and installing elevators connecting to the street and Market-Frankford platforms at 15th.

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.

[10] In 2013, the passage of PA Act 89 (Transportation Funding Law) has allowed SEPTA to move forward with the $147 million BSL/MFL station renovation.