linguistic:voice_change, structural:expansion
1950s to 1990s

The original building was later known as "Wing A". During the 1950s, the top floor was renovated into a library, being redecorated with what Christopher Gray of The New York Times described as "dropped ceilings and the other usual insults". The ten-story Childs Frick Building, which contained the AMNH's fossil collection, was added to the museum in the 1970s.

The architect Kevin Roche and his firm Roche-Dinkeloo have been responsible for the master planning of the museum since the 1990s. Various renovations to both the interior and exterior have been carried out. Renovations to the Dinosaur Hall were undertaken beginning in 1991, and Roche-Dinkeloo designed the eight-story AMNH Library in 1992. The museum's Rose Center for Earth and Space was completed in 2000.