On picture 10 you see the coat of brandenburg.

I assume the photos were taken in one of the "red barracks" in potsdam as is visible for the typical style of late imperial architecture and potsdam was a big garnison city.

On pictures 4 and 3 you can see a lot of repurposed horse garages now for vehicles.

So I suppose some of them were taken at the "garde ulanen kaserne potsdam" as they were the main unit with horses there.

I am trying to find better pictures and retake a look on google earth, but here are some pictures that are from modern times: Garde Ulanen Kaserne:

And here a little movie from the local tv station: Rote Kaserne

Sorry that all my sources are in german - but if you speak russian I am sure you would find more sources. If you need more on the places I can go on looking for more pictures.

And btw the pictures are after the nazis took power - you see swastikas and insignia that are clearly nazi symbols.