Yeah, There is no way to change that Unless I make it larger I think, , The Heli Pad is not place in area the building occupys so it causes that texture effect

This looks much better thn vanilla one (vanilla one looks like space port placed on 1x1m square)
However i find weird texture effect: heli pad white stripes come out of concrete heli pad itself

Added 2 New sizes one larger 4 heli one smaller 2 heli

this picture is right now

To be clear this is a Construction Office With Helicopters