I was living in Pasadena at the time this movie was filmed, but for some reason never saw any of the production. The Michael Myers house is still in South Pasadena, although it's been moved from it's original location - across the street. Now, it faces the Metrolink train line, the Gold Line train nearly runs by the front door.
The house is now a commercial rental space - four offices. One office is currently unrented. Act now.
The first photo in this post is an unretouched photo except for the fact that I used PhotoShop to remove the distracting sign in front of the house. The photo below is the same picture as above, but heavily reworked in PhotoShop.