In Portland, electrical inspections are evident because the city slaps a blue sticker containing the inspection date on the electrical box. Is there any evidence of an inspection?

It is VERY possible that there could have been a new box installed but the original wiring left, even with an inspection. What you are describing is a fire hazard, if so -- I'm not sure it's worth the risk.

Did you ever dig out your lease? Did it say anything about increases?