While most teams turned to multi-purpose parks, some built baseball-only parks. While these modern ballparks shirked some of the conventions of multi-purpose parks, they did include some of the new features. The most notable influences were the cantilevered upper decks, the use of seating colors other than green, fairly plain concrete exteriors, and symmetrical outfields. While the multi-purpose parks have become all but extinct, some modern parks, such as Dodger Stadium and Kauffman Stadium, have been hailed for aging beautifully. Rather than build new parks, the teams have decided instead to renovate the current structures, adding a few newer conveniences. Several of the modern parks built as such have remained in use, with no indication of being demolished.
While Cleveland Stadium is the ancestor to the multi-purpose ballpark, the ancestor of the modern ballpark is Milwaukee County Stadium. It was the first to feature a symmetrical, round outfield fence. It also featured the rounded V-shaped grandstand and colorful seats that are common among modern parks. Coincidentally, it also would have been one of the earlier examples of a converted park as well. It was supposed to replace a minor league facility, and serve as home of the minor league team until a major league franchise could be lured to the city. However, the Braves came to Milwaukee earlier than expected, and the minor league team never played in the stadium.
The first two truly modern ballparks were built by the two New York teams who moved to California, the Giants and the Dodgers. Candlestick Park was created first, but was converted to a multi-purpose park to accommodate the 49ers. Dodger Stadium has been upgraded a number of times, but remains baseball-only and its original design is still largely intact.
Anaheim Stadium, which was initially modeled closely on Dodger Stadium, was expanded for football, but once the Rams departed, most of the extra outfield seating was peeled back, returning the structure to something closer to its original design.
The original Yankee Stadium is an exceptional case. Yankee Stadium was a jewel box park, albeit a very large one. It was showing its age in the 1970s, and the stadium was extensively renovated during 1973–75, converting it into more of a modern style ballpark. Many of the characteristics that defined it as a classical jewel box were also retained, so the remodeled Stadium straddled both categories.
New Comiskey Park (now Guaranteed Rate Field) was the last modern ballpark to be built in North America. A series of renovations have been made to make it appear more like a retro-classic ballpark.
Although they were purposefully built for baseball, some of these stadiums also hosted professional soccer and football teams at times. The Minnesota Vikings played at Metropolitan Stadium during the Twins' entire tenure there, and the Green Bay Packers played a few home games at Milwaukee County Stadium every year from 1953 through 1994. A few of them, including Metropolitan Stadium, also hosted NASL teams during the 1970s.
The only modern parks still used by Major League Baseball are Dodger Stadium, Angel Stadium, Kauffman Stadium, and Guaranteed Rate Field, although the latter has been renovated into a Retro-classic ballpark while Angel Stadium and Kauffman Stadium have been renovated into Retro-modern ballparks.
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