This wood shredder has a magnetic separator to separate the iron from the wood. It is used for shredding internal dry walls made of wood.
This development project is called Presidio PHSH Adaptive Reuse Housing.
The Public Health Service Hospital (PHSH) is located in the Presidio of San Francisco. It has been rehabilitated into luxury condos housing in 2010, and it is now called "Presidio Landmark Apartments".
For more information about this place you can visit my PHSH page.