Greenback Saloon.

[STS Lincolnite]

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.

Ferguson reported his residence as "452 Tenth Street adjoining Ford's Theatre" in his April 18, 1865 statement. Since he owned the Greenback it makes since he would live there as well. Since the Star Saloon adjoined Ford's on the South that would mean if the Greenback adjoined Ford's it would have to be on the North as Roger said - so the red building. I too would then have to assume that the address of the Star was 456 Tenth street. Are there any business directories from that time? I would think one of those would confirm the address for all those buildings.