Found this on the DC Alcoholic Beverage Regulation Administration website. It seems there is a law regulating how much signage a liquor store can have and where the signage can be placed.

Click HERE to go to the quick quide with a list of common regulations .

Click HERE to file an online complaint against an ABC establishment.

Excerpt:

SIGNS

You may not have exterior signs advertising alcoholic beverages, which signs have a total cumulative area in the aggregrate in excess of 10 square feet.

You may have illuminated signs advertising alcoholic beverages during your approved hours of sales. However, these signs cannot contain intermittent flashes of light.

In addition, you may have advertisements relating to the prices of alcoholic beverages displayed in your window as long as the total area covered by the advertisements does not exceed 25% of the window space. You may not have any alcoholic beverage advertisements displayed on the exterior of any windor or on the exterior or interior or any door.