You can look up the APN of the property by using the address and sangis.org. Use the interactive mapper, enter the address, and it will give you the APN.
Using the APN, you can find out information on the property on the San Diego Assessor’s site. The assessor’s site should give you past purchase sales.
You can also find out more by using loopnet.com to look at the property (sometimes it has it listed there and they have more detailed information).
As for rents, I believe they will be going up for a little while. However, I still think the multi-units are too expensive to purchase right now.