The fact that his name was "the red door" is pretty important, as in the key and only factor...
"Hurley House Resource Office/Refugee Center"
Whatever this is it aint on google maps, but I think we're supposed to get the number of the building with the red door, the number should start with... forget, was it 6? The caesar cipher solver doesn't do numbers.
Edit: It would be 1 or 5 depending on whether he cycled the numbers too.
edit: oh god lol I put in ag6hi2 meadow road leeds england google maps
it gave me an ad for the Leeds Language Center
Edit2: lol again, I found google hid their copyrights in the clouds