Built in 1912, Fenway Park is the nation's oldest operating major league baseball stadium and has been the home of the Boston Red Sox since its construction 100 years ago. Once the largest ballpark in the major leagues, it is now one of the smallest and is one of only two surviving early-20th-century major league ballparks (Chicago's Wrigley Field is the other). Designed by architect James E. McLaughlin, Fenway Park looks very much as it did decades ago and is a well-preserved example of the Tapestry Brick style. A substantial expansion in 1934 added concrete and steel structures for grandstand and bleacher seating and introduced the 240-foot retaining wall along Lansdowne Street now famously known as the "Green Monster." The park was threatened by demolition in the late 1990s but the team and ballpark were purchased in 2002 by new owners who saved the structure. Fenway Park was listed in the National Register in 2012 and a major rehabilitation was recently completed using state and federal historic tax credits.