What is "rolling hills estates"

Population (2000): 7676
Housing Units (2000): 2880
Land area (2000): 3.588485 sq. miles (9.294133 sq. km)
Water area (2000): 0.016066 sq. miles (0.041610 sq. km)
Total area (2000): 3.604551 sq. miles (9.335743 sq. km)
FIPS code: 62644
Located within: California (CA), FIPS 06
Location: 33.773738 N, 118.360788 W
ZIP Codes (1990):
Note: some ZIP codes may be omitted esp. for suburbs.
Headwords: