Looks like things are afoot for Mayorga at 14th and Park. Prince of Petworth has been reporting on it a lot - basically, the coffee shop downstairs is closed, and will be reopening as a sushi joint. Apparently it was a franchise. I can't say it's shocking, as the place never had anybody in it when I was there and had a weird atmosphere, but they did have good coffee and drinks, like the s'mores mocha.
The upstairs place will still be serving Korean food, as our Robyn Mincher reported on awhile ago. And apparently it's pretty good. The rumor is that the coffee and espresso-making equipment was leased to Carvel/Cinnabon next door.
Somewhere I saw a mention that the owner of Mayorga (or maybe the owner of the Tivoli) said this change was a breach of contract between them and the franchisee, but I can't find it now. So stay tuned.