The window on the second floor over the flower shop. So the flower shop is a front, and Barbara really makes her money running a brothel?!
The cap is from last week's episode; late, I know, but I don't have broadband. Apologies if this has been dealt with already in this week's episode.
ETA: It has been pointed out to me that the shop in question may very well sell purebred burros, and that I should get my head out of the gutter. I still think it's more likely to be a brothel, though.