serve thousands of E13 customers though existing crosstown cables. The damaged Number One Crossbar Switching System (1XB switch) was cleaned, and a Number One Electronic Switching System (1ESS switch) that had been destined for the 104 Broad Street exchange was diverted. This was the largest loss of telephone service from fire in United States history until the September 11 attacks. Wholly owned subsidiary New York Telephone was an AT&T subsidiary until the AT&T breakup effective January 1, 1984. At that time, New York Telephone, along with the New England Telephone & Telegraph Company, became part of a Regional Bell operating company named NYNEX. The company was referred to as "New York Telephone, a NYNEX Company" before being called simply "NYNEX" starting on January 1, 1994. On August 15, 1997, NYNEX was acquired by Bell Atlantic, who kept the Bell Atlantic name. On June 30, 2000, Bell Atlantic acquired GTE to form the current Verizon Communications, with the corporate headquarters remaining the same 1095 Avenue of the Americas location until 2006 when HQ returned to 140 West Street. New York Telephone provides local telephone service throughout the state of New York, with the exception of the areas served by the Rochester Telephone Company and other smaller independent local exchange companies. The company also serves the Greenwich and Byram exchanges in Connecticut. (The rest of Connecticut is served by SNET.) New York Telephone, then operating under the Bell Atlantic brand, was the first Bell telephone company to win approval to provide long-distance service within its operating territory in December 1999, following the Telecommunications Act of 1996. 21st century The September 11, 2001, attacks destroyed the small telephone exchange inside the World Trade Center, that served the center, and damaged the company's largest exchange building, the Verizon Building at 140 West Street, across Vesey Street. The destruction included cables under Vesey Street as well as inside plant damaged when I-beams and steel from the towers ran through the building. Service was disrupted to approximately 300,000 business and consumer voice circuits, 3,600,000 data circuits (including the New York Stock Exchange), and 10 cell towers. Police Department headquarters lost telephone service, but the nearby NYTel building at 375 Pearl Street had its own small exchange which only lost part of its connections to the rest of the network. Madison Street was closed and cables run out the lower windows of the two buildings and along