The Trump Organization LLC is an American limited liability conglomerate based in Trump Tower in Manhattan, New York. Donald Trump worked for his father's firm, Elizabeth Trump & Son, while attending the Wharton School of the University of Pennsylvania, and in 1968 officially joined the company. He was given control of the company in 1971 and renamed it Trump Enterprises LLC in August 1999 before changing it to Trump Organization LLC in November 1999. The company has interests in real estate development, investing, brokerage, sales and marketing, and property management. The company owns, operates, invests, and develops residential real estate, hotels, resorts, residential towers, and golf courses in different countries, as well as owning several hundred thousand square feet of prime Manhattan real estate in New York City. The organization also has a stake in Trump Entertainment Resorts, which owned the Trump Taj Mahal, the Trump Plaza, and the Trump Marina casinos in Atlantic City, New Jersey.