Hi Christine.
A “plan parcial” determines the development of any area, what can be built, green areas, roads, provision for infrastructure etc.
If a plan parcial submitted by the owner or owners of an area [usually 70,000 m2 or larger] is approved by the local town hall, development can take place within the area, providing it falls within the criteria stated in the plan parcial.
An full architects project must then be submitted for each construction within the area to gain a building license.
A new laws were passed in Andalucia in 2003, severely restricting the development of rustic land [farm land], The Junta de Andalucia [County council] now closely monitor the local town halls.
It is “Premature” for a construction to be offered for sale when there is no plan Parcial for the area, and no building license for the house.
I suggest you contact an independent abogado [Spanish lawyer] for legal advice.
Everybody should always consult an independent abogado before parting with even a deposit for a property in Spain, or anywhere else for that matter.
Best regards
Steve Gilbert