This has been bothering me for YEARS! And I'm hoping that someone here will know what I'm talking about and can tell me the title of this film. I must have been 7 or 8 years old at the time (it was the mid 1970s) and I remember that the film trailer and newspaper ad really scared me. Sadly I cannot remember any of the actors who were in it.
This is what I can recall:
1) Film was from the mid 1970s. I think it was around the time that FOOD OF THE GODS was released as well.
2) It was most certainly a low-budget film that involved monsters and a tenement building in some American city.
3) The only thing from the commercial that I remember is that a scary looking, white slimy hand was turning a door knob in the dark.
4) The movie poster is probably what I remember the most about it. At the time there was a full page newspaper ad and it had a picture of the outside of a tenement building where a bunch of terrified people were on the fire escape - some were literally hanging from it or falling from it. I think there was some monsters on that fire escape too.
I know that's not much to go on but perhaps there's someone here who's familiar with obscure 1970s horror films. Thanks to anyone who can figure this one out. This has been a mystery to me for over 30 years!