I guess it depends on why you want "to make this image seem like the car is actually at the location." If the owner of the car also owns the building, that's one thing.
OTOH, if you are just trying to make the car look good, brightening the background will just make the car look darker. Keep in mind that our eyes are drawn to the brighter parts of the shot. Take a look at POST #30 in this thread: A few Car Lighting Tips
The gray bar at the center is the same density all the way across & the darker background makes the bar look brighter against it.
Even with that, I'd like to see stronger highlights in the body, & have it more to the left so it has some room to "move into" the image, too.