THe Ritz is in the middle of the high rent district. The Majority of the name restaurants are within 2-3 blocks.
Vidalia, Galileo, Palm, Kinkead, Taberna, Prime Rib, Marcel, Melrose Are all within walking distance. All are among the most expensive in DC.

The Grill at RC is nicely decorated.

Malaysia Kopitiam 1827 M Is inexpensive, and interesting.

Georgetown is not that far away, and most of the storefront restaurants on M street are quite decent. I like Tahoga for lunch. All bottle wine is 1/2 off at lunch.

Near the Smithsonian, Atlantico, Jaleo and Andale are lunch places, but can get very crowded.