Item 2. Properties

At September 30, 2018, we occupied the following facilities (square footage in millions):

Our headquarters as well as certain research and development, manufacturing and network management hub operations are located in San Diego, California. Additionally, our QCT segment’s non-United States headquarters is located in Singapore. Our consolidated RF360 Holdings joint venture with TDK leases manufacturing facilities in Germany, China and Singapore. We also own and lease properties around the world for use as sales and administrative offices and research and development centers, primarily in the United States and India. Our facility leases expire at varying dates through 2026, not including renewals that are at our option. Several other owned and leased facilities are under construction totaling approximately 437,000 additional square feet.

We believe that our facilities are suitable and adequate for our present purposes and that the productive capacity in facilities that are not under construction is substantially utilized. We do not identify or allocate facilities by operating segment. Additional information on net property, plant and equipment by geography is provided in this Annual Report in “Notes to Consolidated Financial Statements, Note 8. Segment Information.” In the future, we may need to purchase, build or lease additional facilities to meet the requirements projected in our long-term business plan.