The application for residency is not easier if you have had a property for 5 years, although you can get someone to do the majority of the running around for you at a price. Are you getting confused with dual nationality?
For dual nationality, you need to be RESIDENT for 5 years with a break of no more than six months (in one go, not totalled), and there is a procedure you have to go to which includes you going to discuss your application with a panel. It is not something that someone else can do for you.
Now, if you have dual nationality, you don't need residency permission anymore...
Ownership of a property for any length of time has no relevance