My client received a 1098 from my mortgage listing the insurance and real estate paid for his coop.

Additionally, he also received a letter from the coop listing the value of  shares for his apt.  It says that he should multiply share value times the number of shares.  I calculated these amounts and i get exactly the same amount of insurance and RE tax shown in his 1098 form.  Would I add the amount calculated from the letter to his deductions as well in Schedule A, on top of the deductions reflected in his 1098 form? Or that be duplicating the info incorrectly?