unban underground space property: legal resources needed!

Do you mean urban, rather than unban? And, what exactly are you talking about? Is it regulations for building underground parking garages, housing, retail space, something else? You need to be more specific before we can help you.

I mean, for example, the ownership of underground buildings (parking garages, housing, retail space, metro or some public space), the transfer of these property, lease of these property, the development of the underground space, authority administration on underground space.
Thank you very much!

I expect that where you are there is a Local Government body (that in Australia is called "the Council") such body will have the responsibility of approving development and as such should be able to direct you to the appropriate legislation.
alex