SOUTH SEAS PROPERTIES COMPANY LIMITED PARTNERSHIP CALCULATION OF WEIGHTED AVERAGE UNITS OUTSTANDING EXHIBIT 99 The weighted average number of partnership units used in the computation of earnings per unit is as follows: Six Months Ended June 30 1996 1997 Actual number of units outstanding at the beginning of the period 4,308,568 4,426,568 Weighted average number of units issued during the period 22,667 0 Weighted average number of units outstanding during the period 4,331,235 4,426,568