Welcome !!! Wow, nice find.. provided it wasn't pulled from the floods in LA
The current condition depends largely on the previous owners maintenance and storage rituals. If it was always garaged for example, the rubber parts are far less prone to deterioration. One way to tell if you're not sure, feel the suppleness of the rubber around all the windows..
Rear Air Springs will need to be replaced by now, if they haven't already. They can be checked by anyone familiar with their failure signs. Ok, the failure signs: Switch off the system (switch in the trunk), Jack the rear all the way up from the frame allowing the wheels to hang, inspect the bottoms of the springs (bags) for cracking. Severely cracked springs are on their way to failure.