There is an adult Snowy Owl (completely white) on a building at the southeast corner of L and 17th, NW in downtown Washington, DC. It was being harassed by crows for a time but is now sitting alone and is actively looking around. 

In it's current position, it unfortunately cannot be seen from the street level.  But keep an eye out for it if you live/work downtown.  

Noah Kahn
Silver Spring, MD