Well, after a little looking around, I ran across this :
WARNING.
This link leads to actual crime photos.
Including a few dead bodies.
LINK
It has pictures of the halls and rooms etc.
I've been taking a look to see if I can find any info on this particular photo in the thread and can't find anything on it.
In fact, I was starting to think this may not be the amityville house at all.
But, the arcitecture does in deed match up as does the floor plan.
Here's the original Photo:
Take a look at the banister.
Here's a crime photo of the landing on the second floor :
Notice the banister is pretty much dead on as far as style goes. It has the little hook and the drop as well.
Still looking around, but maybe that'll give someone something to work with.
-DT