Ba Mortgage Securities Inc Mort Ps Thr Cert Ser 1998-4 Sample Contracts

Ba Mortgage Securities Inc Mort Ps Thr Cert Ser 1998-4 – BA MORTGAGE SECURITIES, INC. (April 5th, 2001)

Payment Date: 03/25/01 ------------------------------------------------------------ BA MORTGAGE SECURITIES, INC. Mortgage Pass-Through Certificates, Series 1998-4 BANK OF AMERICA, FSB, MASTER SERVICER ------------------------------------------------------------ Class Information Current Payment Information ---------------------------------------------------------------------------------------------------------------------------------- Beginning Pass Thru Principal Interest Total Principal Interest Type Class Code Name Cert. Bal. Rate Dist. Amt. Dist. Amt. Dist. Losses Shortfalls ----------------------------------------------------------------------------------------------------------------------------------

Ba Mortgage Securities Inc Mort Ps Thr Cert Ser 1998-4 – BA MORTGAGE SECURITIES, INC. (March 6th, 2001)

Payment Date: 02/25/01 ------------------------------------------------------------ BA MORTGAGE SECURITIES, INC. Mortgage Pass-Through Certificates, Series 1998-4 BANK OF AMERICA, FSB, MASTER SERVICER ------------------------------------------------------------ Class Information Current Payment Information ---------------------------------------------------------------------------------------------------------------------------------- Beginning Pass Thru Principal Interest Total Principal Interest Type Class Code Name Cert. Bal. Rate Dist. Amt. Dist. Amt. Dist. Losses Shortfalls ----------------------------------------------------------------------------------------------------------------------------------

Ba Mortgage Securities Inc Mort Ps Thr Cert Ser 1998-4 – BA MORTGAGE SECURITIES, INC. (January 29th, 2001)

Payment Date: 01/25/01 ------------------------------------------------------------ BA MORTGAGE SECURITIES, INC. Mortgage Pass-Through Certificates, Series 1998-4 BANK OF AMERICA, FSB, MASTER SERVICER ------------------------------------------------------------ Class Information Current Payment Information ---------------------------------------------------------------------------------------------------------------------------------- Beginning Pass Thru Principal Interest Total Principal Interest Type Class Code Name Cert. Bal. Rate Dist. Amt. Dist. Amt. Dist. Losses Shortfalls ----------------------------------------------------------------------------------------------------------------------------------

Ba Mortgage Securities Inc Mort Ps Thr Cert Ser 1998-4 – BA MORTGAGE SECURITIES, INC. (November 13th, 2000)

Payment Date: 06/25/00 ------------------------------------------------------------ BA MORTGAGE SECURITIES, INC. Mortgage Pass-Through Certificates, Series 1998-4 BANK OF AMERICA, FSB, MASTER SERVICER ------------------------------------------------------------ Class Information Current Payment Information ---------------------------------------------------------------------------------------------------------------------------------- Beginning Pass Thru Principal Interest Total Principal Interest Type Class Code Name Cert. Bal. Rate Dist. Amt. Dist. Amt. Dist. Losses Shortfalls ----------------------------------------------------------------------------------------------------------------------------------

Ba Mortgage Securities Inc Mort Ps Thr Cert Ser 1998-4 – BA MORTGAGE SECURITIES, INC. (November 13th, 2000)

Payment Date: 05/25/00 ------------------------------------------------------------ BA MORTGAGE SECURITIES, INC. Mortgage Pass-Through Certificates, Series 1998-4 BANK OF AMERICA, FSB, MASTER SERVICER ------------------------------------------------------------ Class Information Current Payment Information ---------------------------------------------------------------------------------------------------------------------------------- Beginning Pass Thru Principal Interest Total Principal Interest Type Class Code Name Cert. Bal. Rate Dist. Amt. Dist. Amt. Dist. Losses Shortfalls ----------------------------------------------------------------------------------------------------------------------------------

Ba Mortgage Securities Inc Mort Ps Thr Cert Ser 1998-4 – BA MORTGAGE SECURITIES, INC. (November 9th, 2000)

Payment Date: 04/25/00 ------------------------------------------------------------ BA MORTGAGE SECURITIES, INC. Mortgage Pass-Through Certificates, Series 1998-4 BANK OF AMERICA, FSB, MASTER SERVICER ------------------------------------------------------------ Class Information Current Payment Information ---------------------------------------------------------------------------------------------------------------------------------- Beginning Pass Thru Principal Interest Total Principal Interest Type Class Code Name Cert. Bal. Rate Dist. Amt. Dist. Amt. Dist. Losses Shortfalls ----------------------------------------------------------------------------------------------------------------------------------

Ba Mortgage Securities Inc Mort Ps Thr Cert Ser 1998-4 – BA MORTGAGE SECURITIES, INC. (May 25th, 2000)

Payment Date: 04/25/00 ------------------------------------------------------------ BA MORTGAGE SECURITIES, INC. Mortgage Pass-Through Certificates, Series 1998-4 BANK OF AMERICA, FSB, MASTER SERVICER ------------------------------------------------------------ Class Information Current Payment Information ---------------------------------------------------------------------------------------------------------------------------------- Beginning Pass Thru Principal Interest Total Principal Interest Type Class Code Name Cert. Bal. Rate Dist. Amt. Dist. Amt. Dist. Losses Shortfalls ----------------------------------------------------------------------------------------------------------------------------------

Ba Mortgage Securities Inc Mort Ps Thr Cert Ser 1998-4 – BA MORTGAGE SECURITIES, INC. (May 11th, 2000)

Payment Date: 03/25/00 ------------------------------------------------------------ BA MORTGAGE SECURITIES, INC. Mortgage Pass-Through Certificates, Series 1998-4 BANK OF AMERICA, FSB, MASTER SERVICER ------------------------------------------------------------ Class Information Current Payment Information ---------------------------------------------------------------------------------------------------------------------------------- Beginning Pass Thru Principal Interest Total Principal Interest Type Class Code Name Cert. Bal. Rate Dist. Amt. Dist. Amt. Dist. Losses Shortfalls ----------------------------------------------------------------------------------------------------------------------------------

Ba Mortgage Securities Inc Mort Ps Thr Cert Ser 1998-4 – BA MORTGAGE SECURITIES, INC. (March 7th, 2000)

Payment Date: 02/25/00 ------------------------------------------------------------ BA MORTGAGE SECURITIES, INC. Mortgage Pass-Through Certificates, Series 1998-4 BANK OF AMERICA, FSB, MASTER SERVICER ------------------------------------------------------------ Class Information Current Payment Information ---------------------------------------------------------------------------------------------------------------------------------- Beginning Pass Thru Principal Interest Total Principal Interest Type Class Code Name Cert. Bal. Rate Dist. Amt. Dist. Amt. Dist. Losses Shortfalls ----------------------------------------------------------------------------------------------------------------------------------

Ba Mortgage Securities Inc Mort Ps Thr Cert Ser 1998-4 – BA MORTGAGE SECURITIES, INC. (February 15th, 2000)

Payment Date: 06/25/99 ------------------------------------------------------------ BA MORTGAGE SECURITIES, INC. Mortgage Pass-Through Certificates, Series 1998-4 BANK OF AMERICA, FSB, MASTER SERVICER ------------------------------------------------------------ Class Information Current Payment Information ---------------------------------------------------------------------------------------------------------------------------------- Beginning Pass Thru Principal Interest Total Principal Interest Type Class Code Name Cert. Bal. Rate Dist. Amt. Dist. Amt. Dist. Losses Shortfalls ----------------------------------------------------------------------------------------------------------------------------------

Ba Mortgage Securities Inc Mort Ps Thr Cert Ser 1998-4 – BA MORTGAGE SECURITIES, INC. (February 10th, 2000)

Payment Date: 07/25/99 ------------------------------------------------------------ BA MORTGAGE SECURITIES, INC. Mortgage Pass-Through Certificates, Series 1998-4 BANK OF AMERICA, FSB, MASTER SERVICER ------------------------------------------------------------ Class Information Current Payment Information ---------------------------------------------------------------------------------------------------------------------------------- Beginning Pass Thru Principal Interest Total Principal Interest Type Class Code Name Cert. Bal. Rate Dist. Amt. Dist. Amt. Dist. Losses Shortfalls ----------------------------------------------------------------------------------------------------------------------------------

Ba Mortgage Securities Inc Mort Ps Thr Cert Ser 1998-4 – BA MORTGAGE SECURITIES, INC. (February 7th, 2000)

Payment Date: 08/25/99 ------------------------------------------------------------ BA MORTGAGE SECURITIES, INC. Mortgage Pass-Through Certificates, Series 1998-4 BANK OF AMERICA, FSB, MASTER SERVICER ------------------------------------------------------------ Class Information Current Payment Information ---------------------------------------------------------------------------------------------------------------------------------- Beginning Pass Thru Principal Interest Total Principal Interest Type Class Code Name Cert. Bal. Rate Dist. Amt. Dist. Amt. Dist. Losses Shortfalls ----------------------------------------------------------------------------------------------------------------------------------

Ba Mortgage Securities Inc Mort Ps Thr Cert Ser 1998-4 – BA MORTGAGE SECURITIES, INC. (February 3rd, 2000)

Payment Date: 09/25/99 ------------------------------------------------------------ BA MORTGAGE SECURITIES, INC. Mortgage Pass-Through Certificates, Series 1998-4 BANK OF AMERICA, FSB, MASTER SERVICER ------------------------------------------------------------ Class Information Current Payment Information ---------------------------------------------------------------------------------------------------------------------------------- Beginning Pass Thru Principal Interest Total Principal Interest Type Class Code Name Cert. Bal. Rate Dist. Amt. Dist. Amt. Dist. Losses Shortfalls ----------------------------------------------------------------------------------------------------------------------------------

Ba Mortgage Securities Inc Mort Ps Thr Cert Ser 1998-4 – BA MORTGAGE SECURITIES, INC. (January 27th, 2000)

Payment Date: 06/25/99 ------------------------------------------------------------ BA MORTGAGE SECURITIES, INC. Mortgage Pass-Through Certificates, Series 1998-4 BANK OF AMERICA, FSB, MASTER SERVICER ------------------------------------------------------------ Class Information Current Payment Information ---------------------------------------------------------------------------------------------------------------------------------- Beginning Pass Thru Principal Interest Total Principal Interest Type Class Code Name Cert. Bal. Rate Dist. Amt. Dist. Amt. Dist. Losses Shortfalls ----------------------------------------------------------------------------------------------------------------------------------

Ba Mortgage Securities Inc Mort Ps Thr Cert Ser 1998-4 – BA MORTGAGE SECURITIES, INC. (January 27th, 2000)

Payment Date: 01/25/00 ------------------------------------------------------------ BA MORTGAGE SECURITIES, INC. Mortgage Pass-Through Certificates, Series 1998-4 BANK OF AMERICA, FSB, MASTER SERVICER ------------------------------------------------------------ Class Information Current Payment Information ---------------------------------------------------------------------------------------------------------------------------------- Beginning Pass Thru Principal Interest Total Principal Interest Type Class Code Name Cert. Bal. Rate Dist. Amt. Dist. Amt. Dist. Losses Shortfalls ----------------------------------------------------------------------------------------------------------------------------------

Ba Mortgage Securities Inc Mort Ps Thr Cert Ser 1998-4 – BA MORTGAGE SECURITIES, INC. (January 27th, 2000)

Payment Date: 01/25/00 ------------------------------------------------------------ BA MORTGAGE SECURITIES, INC. Mortgage Pass-Through Certificates, Series 1998-4 BANK OF AMERICA, FSB, MASTER SERVICER ------------------------------------------------------------ Class Information Current Payment Information ---------------------------------------------------------------------------------------------------------------------------------- Beginning Pass Thru Principal Interest Total Principal Interest Type Class Code Name Cert. Bal. Rate Dist. Amt. Dist. Amt. Dist. Losses Shortfalls ----------------------------------------------------------------------------------------------------------------------------------

Ba Mortgage Securities Inc Mort Ps Thr Cert Ser 1998-4 – BA MORTGAGE SECURITIES, INC. (January 26th, 2000)

Payment Date: 10/25/99 ------------------------------------------------------------ BA MORTGAGE SECURITIES, INC. Mortgage Pass-Through Certificates, Series 1998-4 BANK OF AMERICA, FSB, MASTER SERVICER ------------------------------------------------------------ Class Information Current Payment Information ---------------------------------------------------------------------------------------------------------------------------------- Beginning Pass Thru Principal Interest Total Principal Interest Type Class Code Name Cert. Bal. Rate Dist. Amt. Dist. Amt. Dist. Losses Shortfalls ----------------------------------------------------------------------------------------------------------------------------------

Ba Mortgage Securities Inc Mort Ps Thr Cert Ser 1998-4 – BA MORTGAGE SECURITIES, INC. (January 4th, 2000)

Payment Date: 11/25/99 ------------------------------------------------------------ BA MORTGAGE SECURITIES, INC. Mortgage Pass-Through Certificates, Series 1998-4 BANK OF AMERICA, FSB, MASTER SERVICER ------------------------------------------------------------ Class Information Current Payment Information ---------------------------------------------------------------------------------------------------------------------------------- Beginning Pass Thru Principal Interest Total Principal Interest Type Class Code Name Cert. Bal. Rate Dist. Amt. Dist. Amt. Dist. Losses Shortfalls ----------------------------------------------------------------------------------------------------------------------------------

Ba Mortgage Securities Inc Mort Ps Thr Cert Ser 1998-4 – BA MORTGAGE SECURITIES, INC. (December 30th, 1999)

Payment Date: 12/25/99 ------------------------------------------------------------ BA MORTGAGE SECURITIES, INC. Mortgage Pass-Through Certificates, Series 1998-4 BANK OF AMERICA, FSB, MASTER SERVICER ------------------------------------------------------------ Class Information Current Payment Information ---------------------------------------------------------------------------------------------------------------------------------- Beginning Pass Thru Principal Interest Total Principal Interest Type Class Code Name Cert. Bal. Rate Dist. Amt. Dist. Amt. Dist. Losses Shortfalls ----------------------------------------------------------------------------------------------------------------------------------

Ba Mortgage Securities Inc Mort Ps Thr Cert Ser 1998-4 – BA MORTGAGE SECURITIES, INC. (December 16th, 1999)

Payment Date: 05/25/99 ------------------------------------------------------------ BA MORTGAGE SECURITIES, INC. Mortgage Pass-Through Certificates, Series 1998-4 BANK OF AMERICA, FSB, MASTER SERVICER ------------------------------------------------------------ Class Information Current Payment Information ---------------------------------------------------------------------------------------------------------------------------------- Beginning Pass Thru Principal Interest Total Principal Interest Type Class Code Name Cert. Bal. Rate Dist. Amt. Dist. Amt. Dist. Losses Shortfalls ----------------------------------------------------------------------------------------------------------------------------------

Ba Mortgage Securities Inc Mort Ps Thr Cert Ser 1998-4 – BA MORTGAGE SECURITIES, INC. (June 4th, 1999)

Payment Date: 04/25/99 ------------------------------------------------------------ BA MORTGAGE SECURITIES, INC. Mortgage Pass-Through Certificates, Series 1998-4 BANK OF AMERICA, FSB, MASTER SERVICER ------------------------------------------------------------ Class Information Current Payment Information ---------------------------------------------------------------------------------------------------------------------------------- Beginning Pass Thru Principal Interest Total Principal Interest Type Class Code Name Cert. Bal. Rate Dist. Amt. Dist. Amt. Dist. Losses Shortfalls ----------------------------------------------------------------------------------------------------------------------------------

Ba Mortgage Securities Inc Mort Ps Thr Cert Ser 1998-4 – BA MORTGAGE SECURITIES, INC. (March 31st, 1999)

Payment Date: 03/25/99 ------------------------------------------------------------ BA MORTGAGE SECURITIES, INC. Mortgage Pass-Through Certificates, Series 1998-4 BANK OF AMERICA, FSB, MASTER SERVICER ------------------------------------------------------------ Class Information Current Payment Information ---------------------------------------------------------------------------------------------------------------------------------- Beginning Pass Thru Principal Interest Total Principal Interest Type Class Code Name Cert. Bal. Rate Dist. Amt. Dist. Amt. Dist. Losses Shortfalls ----------------------------------------------------------------------------------------------------------------------------------

Ba Mortgage Securities Inc Mort Ps Thr Cert Ser 1998-4 – BA MORTGAGE SECURITIES, INC. (March 30th, 1999)

Payment Date: 02/25/99 ------------------------------------------------------------ BA MORTGAGE SECURITIES, INC. Mortgage Pass-Through Certificates, Series 1998-4 BANK OF AMERICA, FSB, MASTER SERVICER ------------------------------------------------------------ Class Information Current Payment Information ---------------------------------------------------------------------------------------------------------------------------------- Beginning Pass Thru Principal Interest Total Principal Interest Type Class Code Name Cert. Bal. Rate Dist. Amt. Dist. Amt. Dist. Losses Shortfalls ----------------------------------------------------------------------------------------------------------------------------------

Ba Mortgage Securities Inc Mort Ps Thr Cert Ser 1998-4 – BA MORTGAGE SECURITIES, INC. (February 2nd, 1999)

Payment Date: 10/25/98 ------------------------------------------------------------ BA MORTGAGE SECURITIES, INC. Mortgage Pass-Through Certificates, Series 1998-4 BANK OF AMERICA, FSB, MASTER SERVICER ------------------------------------------------------------ Class Information Current Payment Information ---------------------------------------------------------------------------------------------------------------------------------- Beginning Pass Thru Principal Interest Total Principal Interest Type Class Code Name Cert. Bal. Rate Dist. Amt. Dist. Amt. Dist. Losses Shortfalls ----------------------------------------------------------------------------------------------------------------------------------

Ba Mortgage Securities Inc Mort Ps Thr Cert Ser 1998-4 – BA MORTGAGE SECURITIES, INC. (February 2nd, 1999)

Payment Date: 11/25/98 ------------------------------------------------------------ BA MORTGAGE SECURITIES, INC. Mortgage Pass-Through Certificates, Series 1998-4 BANK OF AMERICA, FSB, MASTER SERVICER ------------------------------------------------------------ Class Information Current Payment Information ---------------------------------------------------------------------------------------------------------------------------------- Beginning Pass Thru Principal Interest Total Principal Interest Type Class Code Name Cert. Bal. Rate Dist. Amt. Dist. Amt. Dist. Losses Shortfalls ----------------------------------------------------------------------------------------------------------------------------------

Ba Mortgage Securities Inc Mort Ps Thr Cert Ser 1998-4 – BA MORTGAGE SECURITIES, INC. (February 2nd, 1999)

Payment Date: 09/25/98 ------------------------------------------------------------ BA MORTGAGE SECURITIES, INC. Mortgage Pass-Through Certificates, Series 1998-4 BANK OF AMERICA, FSB, MASTER SERVICER ------------------------------------------------------------ Class Information Current Payment Information ---------------------------------------------------------------------------------------------------------------------------------- Beginning Pass Thru Principal Interest Total Principal Interest Type Class Code Name Cert. Bal. Rate Dist. Amt. Dist. Amt. Dist. Losses Shortfalls ----------------------------------------------------------------------------------------------------------------------------------

Ba Mortgage Securities Inc Mort Ps Thr Cert Ser 1998-4 – BA MORTGAGE SECURITIES, INC. (February 2nd, 1999)

Payment Date: 01/25/99 ------------------------------------------------------------ BA MORTGAGE SECURITIES, INC. Mortgage Pass-Through Certificates, Series 1998-4 BANK OF AMERICA, FSB, MASTER SERVICER ------------------------------------------------------------ Class Information Current Payment Information ---------------------------------------------------------------------------------------------------------------------------------- Beginning Pass Thru Principal Interest Total Principal Interest Type Class Code Name Cert. Bal. Rate Dist. Amt. Dist. Amt. Dist. Losses Shortfalls ----------------------------------------------------------------------------------------------------------------------------------

Ba Mortgage Securities Inc Mort Ps Thr Cert Ser 1998-4 – BA MORTGAGE SECURITIES, INC. (February 2nd, 1999)

Payment Date: 08/25/98 ------------------------------------------------------------ BA MORTGAGE SECURITIES, INC. Mortgage Pass-Through Certificates, Series 1998-4 BANK OF AMERICA, FSB, MASTER SERVICER ------------------------------------------------------------ Class Information Current Payment Information ---------------------------------------------------------------------------------------------------------------------------------- Beginning Pass Thru Principal Interest Total Principal Interest Type Class Code Name Cert. Bal. Rate Dist. Amt. Dist. Amt. Dist. Losses Shortfalls ----------------------------------------------------------------------------------------------------------------------------------

Ba Mortgage Securities Inc Mort Ps Thr Cert Ser 1998-4 – BA MORTGAGE SECURITIES, INC. (February 2nd, 1999)

Payment Date: 12/25/98 ------------------------------------------------------------ BA MORTGAGE SECURITIES, INC. Mortgage Pass-Through Certificates, Series 1998-4 BANK OF AMERICA, FSB, MASTER SERVICER ------------------------------------------------------------ Class Information Current Payment Information ---------------------------------------------------------------------------------------------------------------------------------- Beginning Pass Thru Principal Interest Total Principal Interest Type Class Code Name Cert. Bal. Rate Dist. Amt. Dist. Amt. Dist. Losses Shortfalls ----------------------------------------------------------------------------------------------------------------------------------

Ba Mortgage Securities Inc Mort Ps Thr Cert Ser 1998-4 – BA MORTGAGE SECURITIES, INC., (July 31st, 1998)

1 Execution Copy -------------------------------------------------------------------------------- BA MORTGAGE SECURITIES, INC., Depositor, BANK OF AMERICA, FSB Master Servicer, and THE BANK OF NEW YORK, Trustee POOLING AND SERVICING AGREEMENT Dated as of July 1, 1998 Mortgage Pass-Through Certificates Series 1998-4 -------------------------------------------------------------------------------- 2 TABLE OF CONTENTS PAGE