Question: Where is the company that released Team Fortress Classic  headquartered?

Context articles: Gang Garrison 2
Valve Corporation
Robin Walker (game designer)
Fortress Forever
GameSurge
Quake mods
Team Fortress 2
Team Fortress Classic
Grant Goodeve
Saxxy Awards

Gang Garrison 2 is an open-source indie video game "demake" of Valve Corporation's "Team Fortress 2".
 Inspired by the 3D graphics of "Team Fortress 2", it takes place in a 2D, 8-bit environment, while retaining its online multiplayer gameplay.
 The game was started by TIGSource.com users "mrfredman" and "MedO", with other users contributing to development.
 It was conceived as an entry into the 2008 TIGSource.com "Bootleg Demake" competition.
Valve Corporation is an American video game developer and digital distribution company headquartered in Bellevue, Washington.
 The company is known for its software distribution platform Steam and the "Half-Life", "Counter-Strike", "Portal", "Day of Defeat", "Team Fortress", "Left 4 Dead", and "Dota 2" games.
Robin Walker is an Australian video game designer best known for co-developing "Team Fortress Classic" and "Team Fortress 2".
Fortress Forever is a multiplayer first-person shooter total conversion modification for "Half-Life 2".
 The game is based on Team Fortress Classic, but has been created entirely from scratch by the "Fortress Forever" development team.
 The intended scope of "Fortress Forever" is to please older "Team Fortress Classic" fans, while at the same time creating a game enjoyable enough to players new to "Team Fortress" styled games.
GameSurge is a popular Internet Relay Chat network devoted to the online multiplayer gaming community.
 Games commonly seen referenced on GameSurge include many first person shooters (such as Counter-Strike, , Team Fortress Classic, Team Fortress 2, Day of Defeat, Call of Duty, and Battlefield 2) and MMORPGs (such as World of Warcraft and Guild Wars).
Based on Id Software's open stance towards game modifications, their "Quake" series became a popular subject for player mods beginning with "Quake" in 1996.
 Spurred by user-created hacked content on their previous games and the company's desire to encourage the hacker ethic, Id included dedicated modification tools into "Quake", including the QuakeC programming language and a level editor.
 As a game that popularized online first-person shooter multiplayer, early games were team- and strategy-based and let to prominent mods like "Team Fortress", whose developers were later hired by Valve to create a dedicated version for the company.
 Id's openness and modding tools led to a "Quake movie" community, which altered gameplay data to add camera angles in post-production, a practice that became known as machinima.
Team Fortress 2 (TF2) is a team-based multiplayer first-person shooter video game developed and published by Valve Corporation.
 It is the sequel to the 1996 mod "Team Fortress" for "Quake" and its 1999 remake, "Team Fortress Classic".
 It was released as part of the video game bundle "The Orange Box" in October 2007 for Microsoft Windows and the Xbox 360.
 A PlayStation 3 version followed in December 2007.
 The game was released for Windows as a standalone entry in April 2008, and was updated to support OS X in June 2010 and Linux in February 2013.
 It is distributed online through Valve's digital retailer Steam, with retail distribution being handled by Electronic Arts.
Team Fortress Classic is a team-based online multiplayer first-person shooter video game developed and released by Valve in 1999.
 Based on the 1996 "Quake" modification "Team Fortress", the title was ported to Valve's GoldSrc engine as a way of promoting "Half-Life"'s software development kit.
Grant Goodeve (born July 6, 1952) is an American actor and television host.
 He is best known for playing the role of David Bradford, the oldest son, on "Eight Is Enough", from 1977 to 1981.
 He sang the theme song for the show as well.
 More recent work includes Home & Garden Television and voice roles, such as the Engineer in the multiplayer video game "Team Fortress 2" and Wolf O'Donnell in "".
 He is also the voice actor for Barik in the "Team Fortress 2" Voice Pack for the multiplayer video game "Paladins".
The Saxxy Awards is an annual competition for films that is hosted by video game developer, Valve.
 The first competition was held in 2011 and included 20 competition categories.
 In 2012, the number of categories was limited to five.
 Voting for the second annual competition ran from November 16, 2012, until November 27, and four of the winners were revealed on the 30th.
 The 2011 winners each received an in-game item for "Team Fortress 2" which was a golden statue of one of the game's characters, Saxton Hale, who was the namesake for the awards; the item resembles an Academy Award.
 The 2012 finalists received an item which was simply a video camera that is used as a melee weapon, while the winners each received a saxxy statue.
 The winner of the 2012 'best overall' category was flown to Valve for a filmmaking session with the company's very own filmmakers.
 At the 2012 Spike Video Game Awards, the final winner from the Best Overall category was revealed: a short film titled "Story of a Sentry".