I'm trying to rotate the camera around the view point of the camera. So when the user looks at a build the camera rotate around that building. But the camera does not need to have the building to rotate around. So therefore I want a camera that can rotate around his own point of view. So that the camera behave everywhere the same in the game.
How can I achieve this in Unity 5.6?
The answer you're looking for is Arcball rotation, similar to the rotation button in the scene view.
There's a pretty good answer (though related to OpenGL and not Unity) here:
How can I orbit a camera about it's target point?
A cursory search for Arcball rotation with Unity doesn't net any specific code examples, that I could find, though the accepted answer in the above link is a great jumping off point.
I would create a Transform variable and set it to the building's center point. Then rotate the camera around it depending on the mouse input.
