It will help if you provided a link to whatever you are looking at.
If you're looking to rent...
your best bet is to engage a property management company and have a rental agent help you. There are way too many scammers who hijack legitimate listings of properties for sale and try to pass them off as their for rent listings. They claim they're from out of town, but give you official looking forms to complete then ask you to wire the money via Western Union. This has been going on for years....
Protect yourselves .... get a professional to help you.
Google property managers in Hayward, and you can find their websites where they post what they have available for rent. Sometimes, they may even know of homes for rent before they become available