Question: What was the sports arena, at which Portland Thunder played their home games, formerly known as ?

Documents:
source: Moda Center
text: Moda Center Moda Center, formerly known as the Rose Garden, is the primary indoor sports arena in Portland, Oregon, United States. It is suitable for large indoor events of all sorts, including basketball, ice hockey, rodeos, circuses, conventions, ice shows, concerts, and dramatic productions. The arena has a capacity of 19,393 spectators when configured for basketball. It is equipped with state-of-the-art acoustics and other amenities.

source: Portland Steel
text: Portland Steel The Portland Steel were a professional arena football team based in Portland, Oregon and members of the Arena Football League (AFL). The team started as the Portland Thunder, joining the AFL in 2014 as an expansion team along with the Los Angeles Kiss. The team have played their home games at the Moda Center. They were known as the Thunder until the franchise went under league ownership in 2016 and became the Steel.

source: Los Angeles Sharks
text: Los Angeles Sharks The Los Angeles Sharks were an ice hockey team that played in the World Hockey Association from 1972 to 1974. Their primary home arena was the Los Angeles Memorial Sports Arena but they sometimes played at the Long Beach Sports Arena when the Sports Arena had other contractual obligations. After the 1973–74 season, the franchise moved to Detroit to become the Michigan Stags and again mid-season to Baltimore to become the Baltimore Blades.

source: Bloomington Thunder (SPHL)
text: Bloomington Thunder (SPHL) The Bloomington Thunder were a minor professional ice hockey team that was a member of the Southern Professional Hockey League. Based in Bloomington, Illinois, the Thunder played their home games at the U.S. Cellular Coliseum, located in downtown Bloomington. After two years in the Central Hockey League as the Bloomington Blaze, the Thunder played under new ownership and in the Southern Professional Hockey League in the 2013–14 season.

source: Louisville Thunder
text: Louisville Thunder Louisville Thunder was an indoor soccer club based in Louisville, Kentucky that was one of the founding clubs competing in the American Indoor Soccer Association. Peter Mahlock served as President and General Manager and Keith Tozer was the head coach. During the first season Tozer moved from just coaching to logging shifts as a player/coach. In their debut season of 1984–1985, goalkeeper Rick Schweizer won the 'Goalkeeper of the Year' award, and made it on to the All-Star team. The Louisville Thunder played its home games at the Broadbent Arena.

source: 2015 Portland Thunder season
text: 2015 Portland Thunder season The Portland Thunder season was the second season for the arena football franchise in the Arena Football League. The team was coached by Mike Hohensee and played their home games at the Moda Center. The Thunder finished third in the Pacific division and 5–13 for the second straight year, and were also one of two teams to go winless on the road. Despite not qualifying for the playoffs with their win-loss record, because the league elected to cease operations of the Las Vegas Outlaws, who had finished ahead of Portland for the final playoff berth in the National Conference, Portland was awarded a playoff berth in their place. They were defeated in the conference semifinals by the San Jose SaberCats, 55–28.

source: Wichita Thunder
text: Wichita Thunder The Wichita Thunder are a minor league hockey team based in Wichita, Kansas. The team played in the Central Hockey League from 1992 until 2014, and then in the ECHL since the 2014–15 season. From 1992 until December 2009 the Thunder played in the Britt Brown Arena located in the northern Wichita suburb of Park City. In January 2010 (the second half of the 2009–10 season), the team began playing its home games at the newly built Intrust Bank Arena.

source: Terry Emmert
text: Terry Emmert Terry W. Emmert is an American businessman, entrepreneur and sports franchise owner from Clackamas, Oregon, a suburb of Portland. He is the founder and owner of Emmert International, an engineering and transport service company, the International Basketball League's Portland Chinooks and the Portland Thunder professional Arena Football League team. He is a 1962 graduate of Central Catholic High School. He has two children, Terry Michael Emmert, who is vice president of Emmert International, and Christine Vessey, the Vice President of Multrec Corporation.

source: List of Portland Steel seasons
text: List of Portland Steel seasons This is a list of seasons completed by the Portland Steel. The Steel were a professional arena football franchise of the Arena Football League (AFL), based in Portland, Oregon. The team was established in 2013 as the Portland Thunder and they played their first season in 2014. The team's name was changed to the Portland Steel prior to the 2016 season. They made the playoffs twice. They folded after the 2016 season.

source: 2014 Portland Thunder season
text: 2014 Portland Thunder season The Portland Thunder season was the inaugural season for the franchise in the Arena Football League. The team was coached by Matthew Sauk and played its home games at the Moda Center. With a 5–13 record in the regular season, the Thunder qualified for the playoffs. However, they were defeated in the conference semifinals by the Arizona Rattlers by a 52–48 score.

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Answer: the Rose Garden,