imported post
The issue is, who is 'In Charge' of that private property?
If you are the owner or the manager of a particular piece of private property, you get to say if OC is acceptable or not. So if you are at your friend's house, and he's 'In Charge', and he's cool with you carrying, then you should be fine.
This concept of 'In Charge' is important and is why it's been stressed time and time again that when an employee of a store confronts you and says "That's illegal" that you should politely ask for the manager, owner, or the
person (note the singular) in charge. If a manager or owner of a store comes up and tells you "not in my store", they are within their right to do so, and you really should put it away or face a "Criminal trespass while in possession of firearm" charge (ORS 164.265), a class A misdemeanor.
You can also let them know you won't be coming back, and will tell everyone you know not to use their business. Impress upon them the understanding that if they scare away all the
law-abiding customers, they will be left with just the
not-law-abiding customers. Ask them if that's the demographic they are really targeting. In these bad economic times, few businesses can afford to purposefully piss off their customers.
Reference: ORS- 164
http://www.leg.state.or.us/ors/164.html