Trader Joe's opening a second D.C. location?

Prince of Petworth reports that the Foggy Bottom Trader Joe's has begun asking all customers for their zip codes at the time of checkout. 

The grocery store has not always done this, leading some to believe they may be considering opening a new location.

Will Penn Quarter finally get its grocery store?

Prince of Petworth seems to think it's going to U Street N.W., but we have plenty of space on 7th Street . . .