In my country as an example.salaries paid to pensioners are usually kind of 30% of their full active salary.Now it will be good only if the full active salary was anything to write home about in the first place let alone now paying 30% of that for pension.So I will say Capital NO, it can't be enough to build such apartment.Their are countries that pays their retirees considerable amount of salary as a reward for the years dedicated during their active service career. While some countries pay their retirees less salary after bowing out of service.
Do you think that the salaries they pay this pensioners will be enough for them to build a 3 bed room flat apartment well furnished??