Using spot hero is always best to find parking on the cheap
I've never used spot hero, but metro is pretty great if you don't mind parking at a garage and riding into the city since the arena is right on top of Gallery Place/Chinatown (red/yellow/green lines).
Carroll Square Garage 608 10th Street NW
What james said about Spot Hero is dead on for this question. It is the only way to secure a proper spot in the District.
They have a lot across the street, which is lower in price, turning concerts
Try what Jason and gordie saysboth sounds like pretty good info
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