An open house is a spiders web for a real estate agent.
The best thing you can do is procure your own real estate agent to show you homes thus making all homes on the market an open house.
Harold Sharpe - Broker
So Cal Homes Realty
California Department of Real Estate Broker License # 01312992
Generally, agents don't hold open houses for homes that are rentals but there are exceptions. You could try calling the agent to schedule a viewing, or try http://www.openhouse.com - this is a good site for the public to search for open houses on.
Hope this helps!
Sotheby's International Realty
This house is spectacular, great Spanish bones, beautiful picture windows, central location in the hills...it's a good one. The house was listed as a lease, not a sale...for $9500/month. It doesn't appear that they closed the deal, as the listing expired. If you are truly interested, I'm sure that it is possible to arrange a time to view it via appointment. But, it will not be open for any Open Houses.
If it is a lease that you are looking for, similar to this type of house/price range, and in the hills, there are several other great properties on the market. A few of these are even being held Open this weekend for viewing. Please contact me and I'll provide the addresses.
If however, you're looking to purchase, then also please contact me and let's discuss your search criteria. Best of luck!
Keller Williams Realty
You're identified as an agent, thus I'm surprised by your question.
As an agent you would have access to the MLS, so you can discover all the info on the house of interest.
Also, if there is no broker's open on Tuesday or weekend open house on Saturday and Sunday afternoons then you can always contact the listing agent directly and set up an appointment.