At a point about 150 feet (46 m) south of Church Avenue, a clear difference in the form of the concrete retaining wall is visible on both sides of the right-of-way.

On August 1, 1920, a tunnel under Flatbush Avenue opened, connecting the Brighton Line to the Broadway subway in Manhattan.

[9] In November 2022, the MTA announced that it would award a $965 million contract for the installation of 21 elevators across eight stations,[10] including Church Avenue.

[13] To accommodate the work, all B trains were rerouted to run local between Prospect Park and Kings Highway.

[14] Church Avenue is an open-cut express station with short tunnels at each end to carry the line between cross streets.

[17] The southern entrance is at the south end of the station on the north side of Church Avenue.

This end of the station originally had a part-time booth during the morning rush; a high-exit turnstile was open at all other times.