to wrap up this whole argument,

and no, I don't know if it's an L.A. County PD van, but I'm sure mike could tell us if it is.
Also, the site I found it on says it's part of the Hollenbeck division, if that helps in identifying it.
That looks like LAPD. But who says it's for detainee transport?
It doesn't have bars on the windows, like the one MikeyPI is building.
This one is obviously for detainee transport and looks newer than the one you posted:

MikeyPI is building me that one.

@ others:
- There won't be an unmarked van, because that has no purpose at all.
- It's not possible to make every unit exit from a different door.
- The building is just a low wealth small apartment.
- Crime scene tape is not possible.
- CSI is fictional, same thing for NCIS and other fake agencies in shows.
- I have seen photo's of that LAFD crane and it looks cool, but I don't know if they use that crane alot.