Tri-Star Pictures to form Columbia Pictures Entertainment. Another case is that of Walt Disney Productions, which, during the Golden Age, was an independent production company and an important Hollywood entity that was not regarded as a major at all until the mid-1980s. At that time, it joined what by then were the "Big Six" majors. These included four of those early Big Five (Paramount, Warner Bros., MGM, and 20th Century Fox); RKO had gone defunct in 1959. Along with these were the remaining two of the original Little Three (Columbia and Universal). At this time, MGM became a mini-major upon the sale from Turner to Kerkorian in 1986, thus retaining the Big Six. Meanwhile, that era ultimately came to an end in 2019 with Disney’s acquisition of 21st Century Fox including TCF, which resulted in a "Big Five" for the first since Hollywood’s Golden Age. This acquisition also left Paramount and Warner Bros. as the only early Big Five members to remain as majors today. The final case is that of Sony. In 1989, it acquired Columbia Pictures Entertainment, which became Sony Pictures Entertainment in 1991. While the main studios of the Big Five are located within of each other, Paramount is the only member of the Big Five still based in Hollywood and located entirely within the official city limits of the City of Los Angeles. Warner Bros. and Disney are both located in Burbank and Universal is in the nearby unincorporated area of Universal City, while Sony is in Culver City. Disney is the only studio that has been owned by the same conglomerate since its founding, and the offices of that parent entity are still located on Disney's studio lot and in the same building. Walt Disney Studios was also the sole studio whose parent entity is still located near Los Angeles, but then a second was added in 2019, with their buyout of 20th Century Fox (which is itself located in Los Angeles in the Century City area). Meanwhile, Sony is in Tokyo, and is the only one owned by a foreign conglomerate. The three other majors had been previously owned by many different companies that were later acquired by and merged with conglomerates that they now report to – in Philadelphia (Comcast via NBCUniversal) and New York City (Paramount Global and Warner Bros. Discovery; which are in turn controlled by National Amusements and Advance Publications