Bangkok One is almost right next door to DC Coast on K, and I've had reasonably good Thai food there for a reasonable price.
If you have the scratch, join the Franklin Club (13th and Eye). It's the little brother of the City Club and the Tower Club, and your privileges extend to all three. There is not a better little buffet for lunch anywhere in town, downstairs with Luis at the bar. Intimate and nice.
Franklin Club is right next to Toscana West, which is reasonably good Italian.
Welcome to Franklin Square, Bob. We have a few decent places within a couple blocks.
Favorite casual lunch places: Juice Joint, Port of Piraeus, Cafe Mozart, Korean food cart on 14th and L, occasionally Brown Bag or Cafe Phillips or Loeb's deli. I generally uphold a no Soho policy unless absolutely necessary.
Favorite business lunches: Brasserie Beck or the Passion Food places, aforementioned DC Coast or Ceiba or Arcadiana. Sadly Corduroy is a little outside the 3 block radius since it moved from 2 blocks to 6 blocks away near the convention center -- I don't think they are open for lunch yet anyhow, but a recent dinner there was great.
Sadly there is no decent place for casual drinks after work. Maybe Bobby Van's Grill if you want to pay $5-6 for a domestic beer. Maybe post pub too. I am still pining over the departure of Stoney's to fancier digs.
Let me know if you discovery anything else tasty and good luck with your new gig.
The Soho there isn't too bad for cafeteria style, but if I remember correctly it is cash only. I second Port of Piarieus (sp?). Also Bangkok One is decent for a thai lunch that isn't too pricey. Siz Ex I think it is has acceptable to go sushi. I used to frequent the Cosi mainly because it had some really healthy options.
You aren't too far from Cafe Mozart 13th and H for German Deli.
There is a Julia's empanadas there I think, it might have moved.
For business Brasserie Beck is a great option already mentioned, Ceiba is probably about 4 blocks and is really good, too. Tuscana West is right there, but I have never been and never hear about it. Morrison Clark may be a few blocks beyond your request. Georgia Brown's is about 3 blocks.
There is a Capitol City Brew Pub not too far, but may be 4-5 blocks, and right by it is Bobby Vann's Grill and if you wanted something different Acadiana is probably about 5 blocks. I haven't been to Mio yet, but it should be close. McCormick and Shmick's is either 3 or 4 blocks down K from you.
And there was a good little burger place right there in my building, I forget the name, will try to think of it.
For cheap, quick eats, Port of Piraeus at 13th & I serves pretty decent Greek standards. There's also the Korean food cart at 14th & L.
Luigino at 12th & H does a nice lunch. You can run up the bill pretty quickly if you want, but you can get out for $15 if you just get a sandwich or pizza and soft drink. I've sat at the bar many a lunch with that plan.
Wow, big change Bob. Sorry to lose you from Falls Church. My number one tip would be El Rinconcito at 11th and M, but that might be a five block walk. The carne deshilada is one of my favories meals in DC. Good tamales also, but I wouldn't veer too far from those recs. At Brasserie Beck, (11th and K) the potatoes gratin with pork belly is disguised as an appetizer, but is really a filling meal for $11. Still, not for everyday.
business lunch or casual lunch?
i work on k between 12 and 13 and even though i brown bag 99% of the time, the only place i will buy lunch from is the juice joint on vermont ave. fresh, good, love it.
but for businessy lunches there's tons of places. olives at 16th and k probably has a good lunch (only been for dinner)