Assessed value going up - Help

[Sam M.]

I purchased a rental (SFR) in Ontario California in 2008. It was foreclosed on the previous owner and we found it on the MLS. I paid $230k. The county keeps increasing my assessed value! I just got a notice that it will be $346k for 2015. It also says the max assessment (prop 13 value) is $346k. I thought prop 13 is based on the price I paid when I bought it. Can I fight this?