You can't. This was an option back before "New properties". So If you didn't sell them before the change over, you will never get the achievement.
u can't
Mega Casinos cannot be sold anymore in the new Properties Feature of Mafia Wars. Before they improved the Properties, you can still sell it and can earn the achievement by selling 50 of it.
you have to sell 50 mega casinos to get the cashing out achievement.
currently you can't
No, you can't.
No.
figure it out
You can't actually sell inventory items in Mafia Wars. So I am afraid you are stuck with it.
On Mafia Wars you can't delete special weapons, you can only sell ones that you buy.
You can sell your inventory items for half the price that you bought that item for.
you could sell properties ... but not any more
No you can't, only the properties can be sold.