Item 2. PROPERTIES

W. R. Berkley and its subsidiaries own or lease office buildings or office space suitable to conduct their operations. At December 31, 2020, the Company had aggregate office space of 4,217,252 square feet, of which 1,105,205 were owned and 3,112,047 were leased.

Rental expense for the Company's operations was approximately $44,291,000, $44,107,000 and $45,778,000 for 2020, 2019 and 2018, respectively. Future minimum lease payments, without provision for sublease income, are $47,477,000 in 2021, $41,442,000 in 2022 and $149,702,000 thereafter.