Ceviche,
I believe I read in another post you said you were constantly entering Argentina due to work. Just save your passport(s) and in case later they change the law or something you are still protected if they ask where the source of the funds were how you got it to Argentina.
You can legally bring up to $10,000 US each time you enter. So each entry stamp in your passport buys you $10,000 in "cash". So that would be justifiable cash in the future if anyone ever asks.
Also, the laws could always change later. Who knows. But for now, locals with a DNI don't have to do anything special when they sell. Heck, many haven't even been paying their annual asset taxes each year.
I suspect there will come a day when the government forces Escribanos to make sure that the owner (even if they have a DNI) has paid the annual asset tax on the property. So far the only thing the Escribanos check for the locals is if they are up to date on their ABL bills.
But Argentina could collect a HUGE windfall if they made all locals pay their fair share of the asset taxes on the apartments each year like they do with foreigners.
