Mission Hills, San Diego April 2021. The area was developed in the early 20th century and most of the houses are still from that era, often carefully preserved and restored. Homes there were also often designed by San Diego's noted architects including William Hebbard, William Templeton Johnson, Emmor Brooke Weaver, Nathan Rigdon, Richard Requa, and Joel E. Brown. Master Builders such as the Pacific Building Company, Morris B. Irvin, and Martin V. Melhorn contributed by building in the vernacular architecture.