Adaptability – The property may happen to have a number of uses. General and local Market conditions are always changing.
Whats popular today may not be popular tomorrow. The better the property can adapt to other uses the better the value and security of income.

Rarity – There are not many similar properties around i.e. supply and demand market forces affect value

Transferable – There must be clear title. If there is no clear title you may have problems when it comes to sell.

Demand – In a popular high demand area the more available qualified tenants the more rent you can charge