text: Also in 2009, the NCPC released its Monumental Core Framework Plan, a comprehensive plan for creating places and spaces around the National Mall to increase the availability of space for new museums and memorials while adding residences and retail features that would make the city a more attractive place to live and work. The plan was adopted by the United States Commission of Fine Arts on March 19, 2009, and approved by the NCPC on April 2, 2009. The Monumental Core Framework Plan proposed adding a new visitor's center and memorial at Banneker Park, an intermodal transportation hub beneath Banneker Park, demolition of the Forrestal Building and its annex, and construction of apartment and office buildings along L'Enfant Promenade with retail and dining space at the street level to accommodate tourists and residents alike. The framework plan also proposed covering over I-395 between Banneker Park and L'Enfant Plaza, covering over the CSX railway tracks (which currently cut L'Enfant Plaza off from the Forrestal complex of buildings), re-establishing Maryland Avenue SW between 12th and 7th Streets SW (it currently does not exist there, due to the presence of the railroad tracks), and restoring the view of the U.S. Capitol building along Maryland Avenue SW.
  However, in September 2009, JBG proposed a much more extensive redevelopment of L'Enfant Plaza. The firm's plans included construction of two 12-story office buildings in the center of the plaza, an extended-stay hotel above 9th Street SW (north of the L'Enfant Plaza Hotel) and either an office building or a residential building over 9th Street SW (south of the L'Enfant Plaza Hotel). (One source claimed this would be an apartment building.) Heyman Properties, owner of the South Building, sued shortly thereafter to stop all renovations and the proposed buildings, saying the construction projects would harm the value of its property. Nonetheless, JBG started renovating the eastern part of La Promenade in late 2009, planned to renovate the western section and install the enlarged atrium beginning in late 2010. JBG presented its master plan to the NCPC in early 2010. In November 2010, JBG released an artist's conception of its proposed plaza building, a two-tower, Gehry-like structure with wavy glass walls.
  2011
  In August 2011, Heyman Properties put the South Building up for sale. Three months later, JBG began the second phase of its La Promenade renovation. The $27 million, 20-month project covered  of space.