Va. Code Ann. § 58.1-3825.3

In addition to the transient occupancy tax authorized by § 58.1-3819, Arlington County may impose an additional transient occupancy tax not to exceed one-fourth of one percent of the total price paid by the customer for the use or possession of any room or space occupied in a retail sale. The revenues collected from the additional tax shall be designated and spent for the purpose of promoting tourism and business travel in the county.