DETROIT—Advertising firm Campbell Ewald announced Wednesday that it will relocate from the suburbs into five floors at the former J.L. Hudson Warehouse at Ford Field at 2000 Brush Street.

The company started in February 1911 in Detroit, and was the main public relations firm for General Motors for decades. Campbell Ewald has been based in Warren, Mich. for 35 years. The firm will take 122,000 sq. ft. in the downtown, with a move in for more than 600 employees planned by January 2014. The company’s current clients include the U.S. Navy, Blue Cross and Zipcar.

Bill Ludwig, chairman and CEO of the firm, says in a statement that the company is returning to its roots. "This is a historic and defining moment for CE," said Ludwig. "Detroit is a hotbed of aspiring creative and entrepreneurial talent and we want to be part of that energy, and participate in the city's comeback. With this space, we will bring our employees together in a collaborative, idea-inspiring atmosphere that fuels creative energy which will result in game-changing ideas for our clients. CE was founded in Detroit 102 years ago, and this is where we want to spend the next 102 years."