[coldstart]

Dumb question:

Why can't Greece sell an island or a chain of islands to Germany or the EU or a private party and pay off part of its debts?

Or they should be forced at least use real property as collateral to lower its interest rates so it doesn't require EU/IMF intervention?

Spain should do the same thing. I am sure that a billionaire somewhere would love to own a Greek or Spanish island.

A list of uninhabited Greek islands from Wiki:

Psyttalia
Leros Salaminos
Revythoussa
Moni Aiginas
Spetsopoula
Romvi
Platia
Psili
Agios Georgios
Patroklou
Fleves
Agios Georgios Salaminos
Ypsili Diaporion
Ypsili Argolidos
Agios Thomas Diaporion
Agios Ioannis Diaporion
Platia Aeginis
Laousses Islets
Kyra Aiginis
Trikeri Hydras
Alexandros Hydras
Stavronisi Hydras
Velopoula
Falkonera

A list of inhabited Spanish islands from Wiki:

Alegranza
Conejera
Formigues Islands
Lobos Island
Montaņa Clara
Perejil Island
S'Espalmador
Isla de Tagomago
Es Vedrā

This is my out-of-the-box contribution. The answer is likely that it is illegal to sell sovereign property to other countries or individuals but I don't know the international laws with respect to the sale of sovereign soil.