Item 2. PROPERTIES

As of December 31, 2019, we own approximately 1.0 million square feet of space on 95 acres of land in Sunnyvale, California, where we house our principal headquarters, research and development, service, and support functions, and certain of our manufacturing operations.

Outside of Sunnyvale, California, we own facilities in other U.S. locations that are used for sales and training as well as manufacturing. We also lease approximately 750,000 square feet for certain engineering, warehousing, and support functions at various locations in the U.S. Outside of the U.S., we own properties in Mexicali, Mexico, primarily for manufacturing operations, and Aubonne, Switzerland, primarily for our international headquarters. In China, our Joint Venture leases facilities for research and development, manufacturing, and sales operations. In Germany, we own and lease facilities for manufacturing operations, as we integrate and build out operations of our acquisition of certain assets and operations from Schölly Fiberoptic GmbH. In addition, we lease various international facilities for sales and other operations.