Well you could use the parking script which will almost guarantees that you make it inside. OR you cool down the surrounding garages so it does not spread and wait for it to burn out.
That was actually going to be my question. I'm glad they are allowing you to update it. Big ups to Chris and Angelesi! Also there is a bug were that the mp-5 doesn't show up in the hands of the officer or Swat personnel.
Did you trying to set the victim down then move? If that doesn't work, park a vehicle close to the building wall, then have the firefighter get in the vehicle. If it's hard to park it, press E+right click for precise parking.