In my previous post i didnt describe enough what I mean.

As OR is my only application for running real estates agency, I need for every offer has customer connected to itself. As Im writing MySQL synchronization script this data (from adress table) would be stored only localy so I would be sure that nobody will see this data.
In Poland we do not show detailed address so I use "notes" for storing information about customer and house number etc. what is not so handy.

I hope I described my idea enough.