drinking in neighborhood

Homeless people are buying beer at the store and drinking it in the back yard of a nearby abandon house. I got the Department of housing to come out and look at the situation but they say there really is not much that they can do because the house is still up to code. Why is it that bars can not sell beer to be consumed off site but this store can? I also found out that nearby schools have the right to veto a liquor license in Seattle but because the local school is a private school they do not have this right. I have decided however that this stores liquor license is probably their Achilles heal.