No, the house is not demolished, some people live in it.
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Yes, it is implied (in both the original Amityville Horror and the remake) that the basement of the house is some kind of portal to Hell.
The original 1979 Amityville horror was filmed in Toms River, New Jersey Since then the house has been moved (slightly - turned side-ways and cosmetic changes were made) New house was built on original spot.
TymesLittleCaps
Only way to find out is ask the owner who remodeled then and find out the construction co that did it. Maybe they sold em to a salvage antique place where they sit today!
You are probably thinking of the remake of The Amityville Horror.