Economy of New York City feet (37.2 million m) that same year, is the largest central business district in the world. New York City is distinctive for its high concentrations of advanced service sector firms in the law, accountancy, banking and management consultancy fields. It is the top global center for the advertising industry, which is metonymously called "Madison Avenue". Silicon Alley, metonymous for New York's broad-spectrum high technology sphere, continues to expand. Finance, high technology, real estate, insurance, and health care all form the basis of New York's economy. The city is also the nation's most important center for mass media, journalism, and publishing.
Media in the San Francisco Bay Area of Al Jazeera Media Network, is also based in the city. As the home of Silicon Valley, several high technology companies involved with Internet media or social media are either headquartered or have a significant presence in the Bay Area. These include the following: Media in the San Francisco Bay Area The media in the San Francisco Bay Area has historically focused on San Francisco but also includes two other major media centers, Oakland and San Jose. The Federal Communications Commission, Nielsen Media Research, and other similar media organizations treat the San Francisco-Oakland-San Jose Bay Area as one entire media