Waymo has acquired a massive 5,500-acre proving ground in Arizona owned by Route 14 Investment Partners LLC, a Delaware shell company associated with Apple, according to documents filed with Maricopa County.

Waymo acquired the property, which is located near other proving grounds in Wittman, Arizona, for $220 million, according to the filing. The sale was recorded June 5. Waymo confirmed the sale to TechCrunch.