First investment purchase... Tax Value vs Market Value?

[Scott Van Straten]

I am about to put in my first offer on a Multi-family Home.  I have ran through the numbers over and over and have found a property that I believe maximizing my Cash for Cash returns with the least amount of risk, in my area.  The property I am debating to make an offer on is asking $68,000  and shows good income, which I will post the details below.   My concern is that when I research the taxes the home value is only $52,000.  Most Multi-family properties with this income are valued higher.  Should I take the tax value into account, or value it based on what I see in the area?  Any advice would be appreciated.  Here is the details, assumed at full purchase price.