Due to the enormous amount of building happening in the area currently, buying should be seen as at least a medium term (5 year) investment.
Those who are looking for a "fast buck" are in the wrong place and selling on is not going to be easy, certainly not at premium prices.
I suspect that we need to wait until the "Developers" have moved on until any individual investers are going to see a resonable return on their investments.
If you have bought on a short term basis in this area, then you may be dissappointed.
Spanish builders take longer to build than most, that is the nature of the beast, be flexible in this respect or dont bother.