between 1969 and 1973. The MARTA subway line opened in 1981. In the 1980s, many older properties were demolished, some remaining vacant for decades. High-density commercial and residential development took root in the north–south corridor along Peachtree and West Peachtree. The BellSouth Center (1982), now the AT&T Midtown Center, was long the landmark skyscraper in the area. However, commercial development escalated after 1987, when One Atlantic Center was completed. The 2000s decade saw the construction of numerous high-rise condo buildings in Midtown, such as the Spire, Viewpoint, and 1010 Midtown. In 2006, then-Mayor Shirley Franklin set in motion a plan to make the 14-block stretch of Peachtree Street a street-level shopping destination. The 2004 opening of the Seventeenth Street Bridge over the Downtown Connector reconnected Midtown with the west side of the city and to the Atlantic Station mixed-use development, which was built on the former site of the Atlantic Steel company. The Midtown Alliance, a group of volunteers, employees, and business and community members, was formed in 1978 in order to work towards improving the overall quality of life in Midtown and transform it into an ideal place for people to actively live, work, and play. Activities of the Alliance include improving neighborhood safety, developing area arts and education programs, and building community leaders. The master plan from the Alliance, called Blueprint Midtown, is credited with fueling the economic resurgence that has helped the once downtrodden Midtown area transform over the past number of years into a popular neighborhood. A 2011 Creative Loafing article claimed that:No part of the city has evolved more dramatically over the past two decades ... Impersonal office buildings, imposing parking decks and cold asphalt arteries have given way to high-rise living and an explosion of street life ... Where once there was a wasteland, now there are great restaurants, groceries, specialty shops, townhouses, lofts, and ... people. Architecture and historic districts In the early 1980s, Midtown Atlanta was a blighted area mainly consisting of parking lots. By 1987, One Atlantic Center was built on the corner of West Peachtree Street and 14th Street, which kick-started the redevelopment of the area. Some contemporary buildings of note are: High Museum of Art by Richard Meier and Renzo Piano One Atlantic Center by Philip Johnson 1100 Peachtree 1180 Peachtree AT&T Midtown Center Four Seasons Hotel Promenade II Spire ViewPoint 1010 Midtown In the area surrounding Peachtree Street,