Item 2. Properties

As of December 31, 2020, our significant properties that we own, lease and use in connection with switching centers, data centers, call centers and warehouses were as follows:

Through the Merger, we acquired leases of real property, including cell sites, switch sites, dark fiber, retail stores and office facilities.

As of December 31, 2020, we owned and leased:

• Approximately 108,000 macro towers and 69,000 distributed antenna system and small cell sites;

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• Approximately 3,400 T-Mobile and Metro by T-Mobile retail locations, including stores and kiosks ranging in size from approximately 100 square feet to 17,000 square feet;

• Office space totaling approximately 1.3 million square feet for our corporate offices located in Bellevue, Washington. We use these offices for engineering and administrative purposes;

• Office space totaling approximately 2.0 million square feet for our corporate offices located in Overland Park, Kansas and Frisco, Texas. We use these offices for administrative purposes; and

• Office space throughout the U.S., totaling approximately 3.0 million square feet, for use by our regional offices primarily for administrative, engineering and sales purposes.