Be very carefull buying in Catalunya and be wary of the friendly Agents that will tell you what you want to hear not what you need to know. Check the Escatura (similar to UK Deeds) you may find that it only has the land on it and not a building. If it has a building I am 99% sure that it will just be an Almacen and not a Casa.  The Ajuntament should be able to tell you if it is a property with a problem.

You could also check the BOP Bulletins
go to https://www.diputaciodetarragona.cat/ebop/
On the left side BOP del dia click on e-sumari then click Historic 2009
On the next page where is says Emissor continue as follows
Desplegueu - Click AMINISTRACIO LOCAL
next Click  AJUNTAMENTS DE LA PROVINCIA DE TARRAGONA
next Click  AJUNTAMENT DE GINESTAR
At the bottom click Accptar

This will list all the insecrcions for the year 2009 from the Ginestar Ajuntament - CADUCITAT DE LA LLICENCIA translates as building licence has been revoked - just see how many this has happend to in Ginestar and you will also see a lot of the names are British.  You can follow the same proceedure for 2010.
This happend because the previous Mayor was giving out illegal licences allowing people to build houses with a Almacen (BARN) licence.
Make sure you can legally live in the property you are thinking about buying and if it does not have a Cedula you will not be able to sell it on as a legal dwelling.

If you know the Poligon and Parcela number you can also look at it on Goolzoom and the Catastro number will tell you if it is registered as having a building on the land (this is different to the Escatura - which you should also make sure it is registered on)  It may come up as RESIDENCIAL but if you click on the corresponding number it will just give the surface area of the building and will list it as INDUSTRIAL.

This does not mean it is a residencial building. 

Take no notice when you are told you do not need a solicitor it may be the best money you spend as they should be able to find out the exact legallity of the building and the land.
Hope this has not confused you too much.   :-?