Bounded by the downtown freeway loop (I-345 on the east; I-35E on the west; I-30 on the south and Woodall Rodgers Freeway on the west), the Downtown Dallas area has seen consistent and organic growth since the early 2000s. Because of this rapid expansion, Downtown Dallas’ boundaries are a lot less clearly defined today, expanding in all directions beyond the previously designated downtown area within the loop. Downtown Dallas today consists of 11 districts, and many different neighborhoods, each with its own distinct vibe and personality. The unique skyline of Downtown Dallas is heavily attributed to the major building boom that occurred in the city during the 1970s and 1980s. Today, many of the buildings that are prominent fixtures in the Downtown Dallas skyline serve as the headquarters to some of the most recognizable corporations in America. One of the more prominent structures in Downtown Dallas is Fountain Place, a 60-story late modernist skyscraper designed by world famous architect I.M. Pei. Located at 1445 Ross Avenue, right in the Arts District Fountain Place stands 720 feet tall and is the 5th tallest skyscraper in Dallas. Its home to a number of a businesses, the most recognizable being Tenet Healthcare, an investor-based health care delivery systems company. Other important companies with headquarters in Downtown Dallas include: 7-Eleven, Greyhound Lines, Inc., Neiman Marcus, and the Trammel Crow Company. Located at 2001 Ross Avenue in the Arts District of Downtown Dallas, Trammel Crow Center (home to Trammel Crow Company) stands 708 feet tall, and boasts 1,200,000 square feet of office space.