Thanks to you I had a good laugh buddy. I went to the city hall, looked for the guys in charge of it and also the city engineers office and asked about ground rights..
the reply was (translated)
"ground rights? you have the right to do whatever you want to parcels of land you legitimately own. Heck, you can even dig for Yama****as treasure if you want to"
So now that gives me an idea...
Thanks!