Our home office consists of our 60-story landmark office tower and five other buildings located in Boston, Massachusetts. We own this facility and occupy approximately 53.0% of the 3.8 million gross square feet of space in these buildings. The balance of the space in these buildings is rented to commercial tenants. In addition, we lease office space throughout the United States as needed for our operations, including for our sales force. We believe that our current facilities are adequate for our current and expected needs.
Since 1987, we have entered into a series of lease agreements with a non-affiliated organization for the rental of furniture and equipment. The leases have a non-cancelable term of twelve months and an expected term of approximately nine years. Annual aggregate commitments under these leases are approximately $7.8 million.
The following table sets forth certain selected historical consolidated financial data. The selected income statement data for each of the years in the three year period ended December 31, 2000 and balance sheet data as of December 31, 2000 and 1999 have been derived from our audited consolidated financial statements and related notes, included elsewhere in this Form 10-K and should be read in conjunction with those financial statements and Management's Discussion and Analysis of Financial Condition and Results of Operations, also included elsewhere in this Form 10-K. The following selected income statement data for the years ended December 31, 1997 and 1996 and balance sheet data as of December 31, 1998, 1997 and 1996 have been derived from our audited consolidated financial statements not included herein. The following selected consolidated financial data has been prepared in accordance with GAAP, except that the statutory data presented below has been prepared in accordance with applicable statutory accounting practices and was taken from our annual statements filed with insurance regulatory authorities. Certain reclassifications to prior periods have been made to conform to the current period presentations.
We evaluate segment performance and base management's incentives on segment after-tax operating income. For a discussion of segment after-tax operating income see Management's Discussion and Analysis of Financial Condition and Results of Operations included elsewhere in this Form 10-K.
(3) Total benefits and expenses includes benefits to policyholders of $4,457.1 million, $5,418.4 million, $4,152.0 million, $4,303.1 million, $4,676.7 million for the years ended December 31, 2000, 1999, 1998, 1997 and 1996, respectively. Benefits to policyholders excludes amounts related to net realized investment gains credited to participating pension contractholders of $6.9 million, $35.3 million, $79.1 million, $29.3 million and $22.3 million for the years ended December 31, 2000, 1999, 1998, 1997 and 1996, respectively.
(6) This is unaudited pro forma information which gives effect to the Reorganization and Initial Public Offering (IPO) of the Company referred to in Note 1 to our audited consolidated financial statements. Because the Company did not have outstanding common stock prior to its IPO on February 1, 2000, the 1999 per share balances represent earnings per common share on a pro forma basis for the period January 1, 1999 through December 31, 1999 using 314.8 million outstanding common shares for the basic and diluted calculations. The 2000 earnings per common share balances represent earnings per common share on a pro forma basis for the period from January 1, 2000 through December 31, 2000 using 314.5 million and 316.2 million outstanding shares for the basic and diluted earnings per share calculations, respectively. Actual net income per common share for the period from February 1, 2000 through December 31, 2000 was $2.53 and $2.51 for the basic and diluted calculations, respectively. No cumulative effect of accounting change occurred in 2000. Pro forma earnings per share for the periods prior to 1999 are presented as it would not be meaningful.
(7) Includes adjustment under Statement of Financial Accounting Standards No. 115, "Accounting for Certain Investments in Debt and Equity Securities." Balances prior to 2000 are formerly referred to as policyholders' equity.
Management's Discussion and Analysis of Financial Condition and Results of Operations is incorporated herein by reference to Management's Discussion and Analysis of Financial Condition and Results of Operations in our Annual Report to Shareholders which is included in Exhibit 13 to this Form 10-K.