Greenback Saloon.

[RJNorton]

Kees, I believe it's the red one - 452 10th Street. What I have read is that it was next to Ford's on the north side.

Here's a little of Ferguson's trial testimony (from Poore):

Q. Do you reside in Washington City?
A. Yes, sir.
Q. What business are you engaged in?
A. The restaurant business.
Q. Where?
A. No. 452, Tenth Street.
Q. Near Ford’s Theatre?
A. Adjoining the theatre on the upper side.