|You can see the car drive past this building on the corner of Franklin Canyon &|
Lake Drive. The house can be seen through the back window of the car.
I posted before on the Zaca Lake scenes filming location here, which is quite a ways away from the filming area where the driving/road scenes with the teens, and the lake kills were done. This area is in the area which is actually Beverly Hills, though quite a ways from the area commonly shown as Beverly Hills.
It's a protected area in the Santa Monica Mountains called Franklin Canyon. The lake is actually Upper Franklin Canyon Reservoir, also called Myers Lake.