BANKAMERICA <BAC> COMPLETES MORTGAGE UNIT SALE BankAmerica Corp's Bank of America unit said it completed the previously announced sale of BankAmerica Finance Ltd to <Bank of Ireland> for an expected pre-tax gain of 23 mln dlrs. BankAmerica Finance provides residential mortgages in south east England. Its total assets at the end of 1986 were about 1.2 mln dlrs.