Brunch or lunch on a Sunday near the Natl Gallery
Try Poste (directly across the street in the Hotel Monaco) for French Bistro style brunch. Their Smoked Duck Ruben and Mushroom Omlette are among my favorite items, and if you want something heavier, my husband enjoys the Eggs Houssarde (sp?).
I'm also a big fan of Clyde's brunch (get the Eggs Chesapeake!) but the service there can be iffy.
Matchbox now offers Sunday brunch as well (I've been wanting to try it) although knowing them, there will likely be a wait and they don't take reservations. If you end up there please report back as I haven't read anything about their brunch.
Zaytinya has brunch too but I've never been.
713 H St NW, Washington, DC 20001
555 8th Street NW, Washington, DC 20004
Clyde's of Gallery Place
707 7th Street NW, Washington, DC 20001
701 9th St NW, Washington, DC 20001