It's been nearly 18 months since Porsche broke ground on its future headquarters and driving experience center in Atlanta, Georgia, and construction is proceeding on schedule, having just reached the "topping out" phase, meaning the top of the seven-level structure has been put in place.

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When complete, Porsche's new headquarters will not just house the day-to-day operations of the largest market for the luxury sports car brand, but also a wide range of customer services and activities, including classic car restoration and display, restaurants, and, of course, the Porsche Experience Center. Porsche is also planning a driving experience center for the west coast.

The Porsche Experience Center at the company's Atlanta HQ will include a 1.6-mile track, as well as special areas for testing specific traits of both car and driver.

Porsche says the total investment in the new headquarters totals about $100 million. When complete, there will be approximately 230,000 square feet of interior space, 14,000 square feet of exterior terraces, and parking for 650 cars.

Porsche U.S. headquarters, expected completion by end of 2014

Porsche U.S. headquarters, expected completion by end of 2014

The building itself will require 3,000 trucks' worth of concrete (27,000 cubic yards), as well as 500 tons of steel. The whole structure (three levels below ground, four levels above) sits on 650 deep foundation piles drilled to an average depth of 60 feet.

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For the track, the main job so far has been moving dirt to form the layout--the paving and safety barrier construction will happen relatively quickly. To date, Porsche has moved more than 15,000 dump trucks' worth of dirt, a total of 225,000 cubic yards.

Porsche expects the project to be substantially completed by the end of 2014, though we'll see the track reach the paving stage by August and the headquarters building skin completed as early as September.