This might be as bottom of the barrel as I have gone so far. I loved the original Bad Seed (1956) and a friend had mentioned once that they remade it in the 80's as a tv movie. Well... I had to see it of course and it is as awful as you would ever think it would be. Still, it's a location in LA...
The apartment is located at 855 S Serrano Avenue in Los Angeles.
The beach scenes were shot at Paradise Cove, located at 28128 Pacific Coast Highway in Malibu, California. This area has been used many times, including American Pie 2.