You really want to make sure you are getting the major sources for finding rentals. First check the paper, for Lamorinda, try the Contra Costa Times, some owners of rental property still will run ads in the paper. Next go on the internet and check Craigslist. Many owners will put an ad on Craigslist and depending on the rental supply and the asking rent, units can stay available for longer periods of time. You should also contact a realtor to make sure you are seeing the available homes that are on the multiple listing service. In lamorinda, many investors still use the services of a broker to find a tenant.