Their are a lot of re-sales for sale at the moment in Torrevieja it is a buyers market. Where abouts on the Costa Calida are you thinking off. would not buy in Camposol in Mazarron they are having a lot of problems down that way such as getting their habitation certificates

I find it odd that even before you buy a property, and without knowing the condition, exact location, purchase price or anything else, your friend thinks it helpful to give you such advice.

What reason does your friend give you for thinking that your property would be hard to re-sell?

If you buy a property at a sensible price you can always sell it at a later date and make a profit.

Spain is no different from anywhere else in that respect.