Not the greatest pictures because it’s an actual workplace for people and a lot of dealerships so walking around kinda feels like trespassing.
On the first floor there is a Lambo, McLaren and high end classic car dealership along with a cafe/restaurant that has a view on a garage workshop where classic cars are restored.
On the second floor are some offices, and more classic car dealers and classic car parts dealers along with a lot of cars on display.
Oh and some F1 cars you can rent for displaying at events.
On to the third (and top) floor:
A view of the parking lot in front.
There are also some workshops around the main building.
I can definitely recommend visiting Klassikstadt if you in or around the Frankfurt area. It’s free to visit and there is tons of awesome stuff, much more than I took pictures of!