The Franklin Street entrance was originally inside a building on the north side of the street. The construction of the 350 Washington Street building beginning in 1965 demolished the older building and widened the street. A rebuilt entrance slightly to the north was incorporated into the new building. It was later replaced by a freestanding headhouse, approximately at the original location, in Shopper's Park. The MBTA proposed to make the headhouse exit-only during budget cuts in 1981. On August 10, 2015, the entrance was temporarily closed for construction of the Millennium Tower, which constructed a new sloping seating area over the entrance. The renovated headhouse reopened on September 12, 2016.
