1 - Is location is good or not for owner.
2 - Is location is haunted or dilapidated.
3 - Face of Land.
4 - Shape of Land (Square, Rectangle, Triangle, Circular, More than 4 Sides, Missing Corner Plot).
5 - Positon, Structure, Slope.
6 - These are some of the things needs to be in consideration before buying plot. But there many more depending upon
what owner want to do with that plot.