Skywalker Ranch is one of the most unusual creative properties in American entertainment history: a private George Lucas estate, a pastoral film-industry campus, a working ranch, a world-class sound and post-production facility, a research retreat, and a symbol of Lucas's lifelong desire to build outside the Hollywood studio system.
It is located in Marin County, California, near Nicasio and San Rafael, north of San Francisco. Lucasfilm's campus description calls it the pastoral home of Skywalker Sound and places it about 40 minutes north of San Francisco.
The Ranch is not a conventional studio lot like Burbank and not a public attraction. Its central industrial function is Skywalker Sound, housed in a 153,000-square-foot Technical Building with a scoring stage, six feature mix stages, 15 sound design suites, 50 editing suites, ADR, Foley, and the 300-seat Stag Theater.
The commonly reported acreage is about 4,700 acres, though different sources use different numbers depending on whether they mean the core Skywalker Ranch parcel, adjacent Lucas-owned land, conservation easement acreage, development-plan acreage, or nearby related properties such as Big Rock Ranch.
Skywalker Ranch is George Lucas's private monument to creative independence: a pastoral fortress built to protect imagination, technology, story, and control.
The most cautious answer is that Skywalker Ranch is commonly described publicly as a roughly 4,700-acre estate and campus complex, with a smaller core developed area and multiple official, legal, and conservation figures depending on which parcels are being counted.