The value of a property is what the highest bidder is willing to pay for it.
We got a good deal on one of our houses because they missed a course and half the basement had a low ceiling. We saved about $10 thousand.
And the damn town assessors really stink sometimes. They do their square ft stuff....and forget the cost of the custom made cupboards...or don't count the Marble floors...imported from Italy. etc etc etc....
AND THAT VALUE CAN CHANGE DAILY
Exactly. The market value of a house is what it will sell for today.