My vote is definitely not a Turkey Vulture. It wasn't standing like a Turkey Vulture and the head is all wrong. Vultures heads have no feathers -- apparently it helps when they stick their heads in carcasses. Here's a Turkey Vulture.
It doesn't look like any hawk that I've seen by the way it was standing on the roof. The hawks that I've seen tend to stand upright like the vulture in the above picture.
The "V" of the wings doesn't really count in the picture where it's taking off since it's flapping during takeoff. The "V" thing has to do when soaring in the open sky.
I'm guessing some sort of gull. You'd be surprised how big the wingspans of gulls can be.
