You will not get a good rental income on the CDS as there are literally thousands of EMPTY apartments. Sotogrande is suffering from over-development (have you seen the marina?) Altea used to be a nice place but I haven’t visited for years. My advice, if it is for investment only, go for run down terrace houses in the UK. or a 2 person apartment in Paris etc. I am with a private consortium and we have done well over the last 5 years with these.