decades. In 1972, the agency received a federal grant that funded two-thirds of a $14.3 million modernization program for downtown stations, including $2 million for Washington station. As part of that project, the MBTA investigated the feasibility of connecting , , Washington, and with pedestrian tunnels. The stairways between the Summer Street Concourse and the Orange Line platforms were reconfigured. 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. Originally, the Orange Line level had an underground concourse with several direct access points to basement entrances of various stores in the district, such as Jordan Marsh (now Macy's) and the former Filene's department store. In 1979, the Winter Street Concourse was opened, connecting the upper level of Downtown Crossing station (inside fare control) to the upper level of Park Street station two blocks away, utilizing an existing but previously unopened section of the concourse. Both levels of the station were substantially renovated and accessibility was improved in the mid-1980s. The 101 Arch Street building, completed in 1989, included access to the Summer Street concourse (including an elevator) through its basement level. By 1991, a 1914-installed wooden escalator in the station was the oldest operating escalator in the world. Modernization in the 1980s included the installation of Situations, a set of 31 skewed marble seats designed by Buster Simpson along the Red Line platform. During the renovations, temporary artworks were displayed as part of the Arts on the Line program. One work on the Orange Line level, a take on Invasion of the Body Snatchers, featured 'alien' eggs that grew and eventually hatched 'aliens' portrayed by costumed actors. In August 1987, the MBTA board approved plans for an MBTA Transit Police substation in the Summer Street Concourse. The $950,000 substation opened on July 26, 1988. Silver Line service from Downtown