is this place located in an open-air ground or in a building?
Inside Brookfield Place, and a historic Bank of Montreal building.
Hockey Hall of Fame
Its first permanent building opened at Exhibition Place in 1961. The hall was relocated in 1993, and is now in Downtown Toronto, inside Brookfield Place, and a historic Bank of Montreal building. The Hockey Hall of Fame has hosted International Ice Hockey Federation (IIHF) exhibits and the IIHF Hall of Fame since 1998.

where is the hockey hall of fame located Toronto, Ontario, Canada what is this hall of fame? It is a place that exhibits Trophies, Memorabilia and equipment worm by players during special games.
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Hockey Hall of Fame [SEP] Introduction
Honoured members are inducted into the Hall of Fame in an annual ceremony held at the Hall of Fame building in November, which is followed by a special "Hockey Hall of Fame Game" between the Toronto Maple Leafs and a visiting team. As of 2020, 289 players (including seven women), 112 builders and 16 on-ice officials have been inducted into the Hall of Fame. The Hall of Fame has been criticized for focusing mainly on players from the National Hockey League and largely ignoring players from other North American and international leagues.