Real estate agencies (REA) do not just accept all the properties that sellers are willing to sell thru them.
I have no prior experience, but I imagine that there are some criterias that REA check and decide if a property is marketable (and profitable) for them too, and not only to the seller.
For example, a REA might not want to take care of a very nice villa in the middle of the nowhere in the Alps.
Or, it might not want to take care of an almost destroyed refuge in an unknown place.
Could you provide a few general example of types of properties, such as strange parking lots, unusual land parcels or strange city places...
Free room to your fantasy!!
thx for the help,
Nic