I don’t know what the commuter traffic is like on San Mateo bridge vs. Bay Bridge. Google tells me that Hayward to Brisbane is 26 miles and Montclair to Brisbane is 23 miles.
When you are looking at suspiciously cheap fixers, the general rule is that if something seems too good to be true, it probably is … For example, here’s a 3-bedroom fixer in Millbrae for 545k:
