Since the late 1980s the NPS has constructed a number of buildings for island rangers and maintenance workers. South of the upper ranch house, a generator building, fuel storage building, and solar panels provide electrical power and fuel.

In 1998-99 the NPS constructed a residential compound for rangers, researchers, and maintenance personnel on a hill above the ranch complex. At a site across Windmill Canyon the NPS constructed a maintenance and water supply facility with a shop, pumphouses, storage tanks, and utility buildings.