Looking at the right :

Pointe de Rochebonne, a R677 gunbunker for 88 m/m is hidden...

...behind the white fence in the middle of the photo.                                                           The same gunbunker in wartime !  

But this is the answer to my investigation :

this lonely warehouse down the Avenue Charles Prevet
may be the garage for H.K.P. 528.

In fact, an annex for the headquarter located in Rennes as shows on these headed documents :

Pierre Villeneuve's collection.                                                             
- A repair order 

- French interpreter working attestation with inkmark

Pierre Villeneuve's collection.                                                                          

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