That was his observation if you want to know his plans you'd have to ask him but I doubt if he will tell you.

We haven't got ESB:R yet so I doubt if Ady would give full on details about ROTJ:R.

I'm not sure about the Jedi Temple, I'd have thought Palpatine would have pulled it down or turned it into some sort of prison/secret police HQ.

The lit up building in the DVD version looks very wrong.

The Senate building would possibly still be there though as the Imperial Senate was only disbanded in ANH.