The electrician came and isolated the smell and pulled the breaker for that area. Aired the house out. Reset the breaker and the smell came back. It was a hanging light fixture. Turns out that up inside the thing it had shorted out and was melting the plastic in the fixture. It was in the stairwell with a high vaulted ceiling so I could have never reached it without a big ladder. He just pulled down the fixture and made sure all was well inside. Thank God the landlord is paying for it.