Normally, the value of a property is decided by looking for advertising of similar plots, both for the area and for its characteristics.
In the lot trading market, trading is important. The opinion of the interested party is as important as the current owner.
In general, the first counter offer is usually an amount less than that offered by the owner, and is the beginning of a negotiation.
In a negotiation, just like in real life, it is difficult to have everything under control. However, there are several aspects to take into account for those interested in acquiring land, which can cause its value to vary.