You have no way of knowing. Moreover, the Last Sale Price is an event that occurred much too far in the past to be relevant to current market value. It is safest to ignore this information as well. The most accurate way to determine the market value of a home is to use actual comparable sales. The problem, however, is that in real life this happens rarely.
Some homes are larger, others are smaller.
Some are older, others are newer. Some need repairs, others are perfect. But don't worry, there is a solution to this seeming dilemma. Determining current market value is not an exact science. Like an appraiser, we want to make an educated guess.