Who is claiming all the property left behind by the Syrian refugees?

There are now 4 to 6.5 million Syrian refugees living in various countries either seeking asylum or living in camps. (In March 2013, the number first reached 1 million.)
Presumably these refugees left behind property: apartments, houses, valuables, bank accounts, etc. Who is taking claim to all this? Will it ever be returned?
The 6.5 million number of refugees is similar to the 6 million Jews killed in concentration camps. Their property was typically taken over quietly by neighbors in Germany, Austria, Poland, and other countries invaded by Germany. Very little of it was returned. After all, the dead can not ask for compensation.
Now we have 6.5 million live refugees. Will they eventually try to return to claim their property? Does Syria have land ownership rights? Even if their homes are destroyed do they still own the land?
I have heard nothing about this.

After this disaster ends will the world invite them back and help them set up a Syrian homeland similar to what happened in Israel? .