Query on buliding having floor wise ownership.

Hi,

I am the owner of 1st and 2nd Floors of a house. Ground floor ownership is with a different family.

Floor 2nd has been partially constructed in the building.

Now I want to fully construct the 2nd Floor of the house, and also do some renovation on the 1st floor.

Now do i require a No objection certificate from the Ground Floor Owner to do construction on partially constructed 2nd Floor ?

If yes, then what all construction can be done without No-Objection Certificate ?

Thanks in Advance.