<< hey, I can't help you with portland, but I can tell you that Corvallis homes suck at putting up lights 😀 I can't wait to go home. >>
Actually, if you move in to one of the houses on one of those streets, part of the agreement of your living there (you actually have to sign an agreement) is that you put up absolutely everything that the previous owners put up, the year before. Anything else that you add, you have to keep putting up in the following years and will be added to the list of things that the next owners will have to put up if you ever sell the house and move.
It's a local tradition that has been around for years. I LOVE GOING! 🙂
Nik