Item 2. PROPERTIES

As of December 31, 2015, there were 2,010 Chipotle and other concept restaurants in operation. The table below sets forth the locations (by state or country) of all restaurants in operation.

We categorize our restaurants as end-caps (at the end of a line of retail outlets), in-lines (in a line of retail outlets), free-standing, or other. Of our restaurants in operation as of December 31, 2015, we had 1,231 end-cap locations, 337 free-standing units, 311 in-line locations, and 131 other locations. The average restaurant size is about 2,530 square feet and seats about 58 people. Many of our restaurants also feature outdoor patio space.

Our main office is located at 1401 Wynkoop Street, Suite 500, Denver, Colorado, 80202 and our telephone number is (303) 595-4000. We lease our main office and substantially all of the properties on which we operate restaurants. For additional information regarding the lease terms and provisions, see Item 7. “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Contractual Obligations,” as well as Note 8. “Leases” in our consolidated financial statements included in Item 8. “Financial Statements and Supplementary Data.”

We own 17 properties and operate restaurants on all of them.