Greenbriar's McDonalds is the first Franchise location in the Country built with Drive-Thru at the "time of construction". There are several other McDonlads location with drive - thru before Greenbriar's but the drive-thru's were all added to the existing building in those locations..
http://chantilly.patch.com/articles/greenbriar-mcdonalds-demolished-for-rebuilding#photo-7801639