of Houston's office space and 22% of Houston's Class A office space. Major employers include 3D/International, Air Liquide, Aon, Apache Corporation, BBVA Compass, BHP, Bechtel Corporation, Beirne, Maynard & Parsons, Bindview Corporation, CBRE, Dow Chemical, Duke Energy, General Electric, Hines, iHeartMedia, Inoapps, Litton Loan Servicing, Marathon Oil Corporation, MWH Americas, Net IQ Corporation, Nextira One, Panhandle Pipeline Co, Schlumberger, Stewart Title Guaranty Company, Telecheck International, The Lab Consulting, GDF Suez Energy Resources NA, and Williams Companies. Around 2,000 companies maintain operations in Uptown. Numerous radio studios are located in Uptown. Two of the four major English-language commercial radio broadcasters have studios here. The Cox Radio Houston cluster consisting of KKBQ, KGLK, KHPT, and KTHT. is in 3 Post Oak Central. The IHeartMedia Houston cluster of KBME, KODA, KQBT, KPRC (AM), KTBZ-FM, and KTRH is located in 2000 West Loop South. Spanish-language Univision Communications Houston TV studio (KXLN-DT and KFTH-DT) and radio cluster (KLTN, KAMA-FM, KLAT, KOVE-FM and KQBU-FM) is located near the Southwest Freeway and Loop 610 interchange. Cushman & Wakefield's Houston office is in Four Oaks Place. In the 1990s Weatherford Enterra (now Weatherford International) had its corporate headquarters in Four Oaks Place. By 2000 Weatherford moved to a new location in Houston. Before its dissolution Stanford Financial Group had its headquarters in Uptown. Many international hotel chains have locations in Uptown. Diplomatic missions Several consulates-general are located in Uptown. The consulates of Angola, Australia, Argentina, Chile, Denmark, France, Germany, India, Italy, Peru, Qatar, South Korea, Spain, Turkey, Vietnam, and the Consulate of the Netherlands are in Uptown. From its founding on May 25, 1982 to April 1988, the Consulate-General of Indonesia in Houston was located in Post Oak Central in Uptown. The Consulate-General of Egypt in Houston was located in Suite 1750 at 2000 West Loop South and later in Suite 2180 in Post Oak Central. As of 2008 the consulate is now at 5718 Westheimer Road, outside Uptown. Architecture The Uptown District boomed along with Houston during the 1970s and early 1980s. A collection of mid-rise office buildings appeared along the Interstate 610 west (or simply "West Loop"). It became one of the most impressive instances of the edge city. The highest achievement of Uptown was the construction of the landmark Williams Tower, designed by Philip Johnson (known as the Transco Tower until 1999). At the time, it was believed to be the world's tallest skyscraper outside