The Safeco Field has a bullpen area and centerfield terrace .
When standing-room areas do exist , they are generally not sold separately from seats , but rather are provided for spectators who wish to view a portion of the game from a different angle ( such as the bullpen area and centerfield terrace at Seattle 's Safeco Field ) , or are admission-free ( such as an area at San Francisco 's AT & T Park , where the game is visible from a public waterfront walk , through a series of fenced archways which form a part of the outfield wall ) .