The value of a property to me (in my very limited sensibility, as claimed by certain posters) is the value that it sold for. So, if you bought a property for $100K, that is the value you should be taxed on the first year, then every year after the cost of living is added on. There are/were states that did that. Which they are, I leave to your own personal googling ability, so as not to start more nit picking controversies. Assessors just guess and base it on some arbitrary/argued formulas that aren't fair.
My neighbors house is on the market for an obscene value. If it sells, my taxes will go up, why? I don't even live on an island !