Why do some grocery stores in Colorado have regular beer and liquor but some only sell 3.2% beer? I live in Denver, Colorado and I have noticed many grocery stores will have full a liquor selection and normal alcohol content beer, but others will only sell 3.2% beer and no liquor.  This goes even for the same chain of stores.  For example, Safeway will carry a full liquor selection at one location but only 3.2% beer at another.  

This seems to apply to every chain in town including: King Soopers, Safeway, Walmart, Target, etc.  Therefore I am wondering if there is a law limiting this?  If so, what are the details?
Retail stores in Colorado sell spirits, wine, and beer. Grocery and convenience stores sell 3.2 percent beer only, and then not between 2 a.m. and 6 a.m. Package stores are open 8 a.m. until midnight and are closed on Sundays. Bars stop selling alcohol between 2 a.m. and 7 a.m.
http://www.alcohollaws.org/coloradoalcohollaws.html  

I would guess those "grocery stores" selling spirits and such are probably classified as something other than a grocery store.  

This information may be a little out of date, Colorado does allow Sunday sales now. I found this on Wikipedia:  


  Spirituous, vinous &amp; malt liquor available in liquor stores and
  liquor-licensed drug stores only.  Liquor stores closed on Christmas
  Day. Sunday sales restriction lifted on July 1, 2008. Liquor stores
  and liquor-licensed drug stores may have only one location, while 3.2%
  beer may be sold in gas stations, supermarkets, and convenience
  stores. Appropriately licensed businesses may also sell 3.2% beer for
  both on and off-premise consumption. A small number of grocery stores
  are licensed as drug stores and sell full strength beer, wine, and
  spirits. As an example, a chain grocery store that has pharmacy
  services at most or all locations may elect a single location in the
  chain as the licensed establishment to sell beer, wine, and spirits.