No peeing on the machines, please!
Actually the guy is spraying water on the debris for dust abatement.
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.