Pryso, that was ground 0, it was the right place and at the right time; that was on 64th and Cottage Grove.
Dinah Washington lived in that neighborhood at about that time, I saw her car parked in front of the lounge with a crowd of people around it; that's because most people didn't know what kind of car it was. Since she wasn't performing, she was probably just having a cocktail with friends.
Here is the car; I can't swear to what color it was, black I think, with gold letters on the spare located on the trunk;
https://www.google.com/search?q=56+lincoln+continental&rlz=1C1CHBD_enUS858US858&oq=56+lincol...
https://en.wikipedia.org/wiki/Continental_Mark_II