Credit: This artists rendering shows 4040 Wilson Blvd., which once complete will be the tallest building in the Ballston area of Arlington County.The 22-story mixed-use building breaks ground in 2018 across from the Ballston Mall. AvalonBay Communities will relocate its headquarters into the building once it's completed in 2020. (Courtesy the Shooshan Company/Brandywine Realty Trust)

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