The cache is not at the posted coordinates!
You can learn the coordinates for this mystery cache by completing the Walking Tour of Leesburg, VA Adventure Lab. You will need a smartphone with data service and the Adventure Lab app installed. You can install the app by going to https://labs.geocaching.com.
You can launch the adventure by opening the Adventure Lab app and browsing to "Walking Tour of Leesburg, VA".
Once you've completed the adventure, you should have 5 codes: A, B, C, D, and E. If you need to retrieve the codes later, you can reopen the adventure in the app, and view the journal entries for each of the 5 locations.
The cache is located at the following coordinates:
N 39° 07.(A)(B)(A) W 77° 34.(C)(D)(E)