products such as the OS/2 operating system and VoiceType Dictation, later known as ViaVoice voice-recognition software. IBM maintained its facilities in the South Florida area until 1996, when the facility was closed and sold to Blue Lake Real Estate. The site was sold to T-REX Management Consortium, then to the Blackstone Group in 2005, who renamed it the Boca Corporate Center and Campus. The site was later renamed the Boca Raton Innovation Campus (BRiC). Crocker Partners, noted for its development of Mizner Park and Office Depot headquarters, purchased BRiC in April 2018. What used to be IBM's Building 051, an annex separated from the former main IBM campus by Spanish River Boulevard, was donated to the Palm Beach County School District and converted into Don Estridge High Tech Middle School. It is named after Don Estridge, whose team was responsible for developing the IBM PC. IBM returned in July 2001, opening the software development laboratory at Beacon Square off Congress Avenue. It is noteworthy that still left standing inside the old IBM complex is the office and conference table where Bill Gates signed his historic deal to supply IBM with the Microsoft MS-DOS operating system for its personal computer line. Suburban expansion In the 1980s, because of an explosion of development to the west of the historical center of the city, some eastern areas began to decay, including the downtown corridor. For instance, the old Boca Raton Mall, a shopping mall in the downtown area, was beginning to experience higher vacancy, and occupancy by marginal tenants, owing to the opening of Town Center at Boca Raton west of the city in 1980. In 1991, the new downtown outdoor shopping and dining center, Mizner Park, was completed over the site of the old Boca Raton Mall. It has since become a cultural center for southern Palm Beach County. Featuring a landscaped central park between the two main roads (collectively called Plaza Real) with stores only on the outside of the roads, Mizner Park resembles a Mediterranean suburban "town center" with a more contemporary look. It features many restaurants and is home to the Boca Raton Museum of Art, which moved to the new facility in 2001. In 2002, a new amphitheater was built, replacing a smaller one and providing a large-capacity outdoor venue where concerts and other performances are held. The Mizner Park Cultural Center, an indoor performing arts/comedy show theater