Payment Date: 06/25/00
------------------------------------------------------------
BA MORTGAGE SECURITIES, INC.
Mortgage Pass-Through Certificates, Series 1998-4
BANK OF AMERICA, FSB, MASTER SERVICER
------------------------------------------------------------
<TABLE>
<CAPTION>
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
----------------------------------------------------------------------------------------------------------------------------------
<S> <C> <C> <C> <C> <C> <C> <C> <C> <C>
Senior IA-1 13,087,432.32 6.650000% 331,152.15 72,526.19 403,678.34 0.00 0.00
IA-2 19,211,271.75 6.250000% 658,164.90 100,058.71 758,223.60 0.00 0.00
IA-3 6,800,000.00 6.650000% 0.00 37,683.33 37,683.33 0.00 0.00
IA-4 23,800,000.00 6.600000% 0.00 130,900.00 130,900.00 0.00 0.00
IA-5 43,628,758.21 6.500000% 724,395.32 236,322.44 960,717.77 0.00 0.00
IA-6 3,862,454.62 6.750000% 0.00 21,726.31 21,726.31 0.00 0.00
IA-7 61,013,622.19 7.110000% 120,331.20 361,505.71 481,836.91 0.00 0.00
IA-8 11,750,771.68 4.621131% 23,174.90 45,251.55 68,426.44 0.00 0.00
IA-9 4,067,574.81 7.500000% 8,022.08 25,422.34 33,444.42 0.00 0.00
IA-10 0.00 6.750000% 0.00 0.00 0.00 0.00 0.00
IA-11 3,394,021.63 6.750000% 0.00 0.00 0.00 0.00 0.00
IA-12 59,500,000.00 6.750000% 0.00 334,687.50 334,687.50 0.00 0.00
IIA-1 24,069,234.99 6.500000% 355,225.80 130,375.02 485,600.83 0.00 0.00
IIA-2 25,828,000.00 6.500000% 0.00 139,901.67 139,901.67 0.00 0.00
IIA-3 19,183,152.57 6.500000% 0.00 103,908.74 103,908.74 0.00 0.00
IIA-4 0.00 6.500000% 0.00 0.00 0.00 0.00 0.00
IIA-5 0.00 6.500000% 0.00 0.00 0.00 0.00 0.00
IIA-6 24,019,193.99 6.500000% 98,471.61 130,103.97 228,575.58 0.00 0.00
I-X-1 0.00 0.245114% 0.00 0.00 0.00 0.00 0.00
I-X-2 100,950,335.98 0.245114% 0.00 20,620.28 20,620.28 0.00 0.00
I-X-3 70,972,000.00 0.245114% 0.00 14,496.86 14,496.86 0.00 0.00
I-X-4 71,950,274.17 0.245114% 0.00 14,696.68 14,696.68 0.00 0.00
II-X 816,618.59 6.500000% 0.00 4,423.35 4,423.35 0.00 0.00
I-PO 100,260.75 0.000000% 149.92 0.00 149.92 0.00 0.00
II-PO 238,531.93 0.000000% 1,057.68 0.00 1,057.68 0.00 0.00
Residual R-I 0.00 6.750000% 0.00 0.00 0.00 0.00 0.00
R-II 0.00 6.500000% 0.00 0.00 0.00 0.00 0.00
R-III 0.00 6.750000% 0.00 0.00 0.00 0.00 0.00
----------------------------------------------------------------------------------------------------------------------------------
Subordinate IM 6,772,936.74 6.750000% 6,437.39 38,097.77 44,535.16 0.00 0.00
IB-1 3,111,704.20 6.750000% 2,957.54 17,503.34 20,460.88 0.00 0.00
IB-2 1,647,603.71 6.750000% 1,565.98 9,267.77 10,833.75 0.00 0.00
IB-3 1,281,578.58 6.750000% 1,218.09 7,208.88 8,426.97 0.00 0.00
IB-4 915,553.46 6.750000% 870.19 5,149.99 6,020.18 0.00 0.00
IB-5 915,550.52 6.750000% 870.19 5,149.97 6,020.16 0.00 0.00
IIM 1,139,987.90 6.500000% 4,673.61 6,174.93 10,848.55 0.00 0.00
IIB-1 419,412.08 6.500000% 1,719.47 2,271.82 3,991.28 0.00 0.00
IIB-2 300,239.92 6.500000% 1,230.90 1,626.30 2,857.19 0.00 0.00
IIB-3 359,364.10 6.500000% 1,473.29 1,946.56 3,419.84 0.00 0.00
IIB-4 180,143.95 6.500000% 738.54 975.78 1,714.32 0.00 0.00
IIB-5 300,137.70 6.500000% 1,230.48 1,625.75 2,856.22 0.00 0.00
----------------------------------------------------------------------------------------------------------------------------------
----------------------------------------------------------------------------------------------------------------------------------
Totals - - 357,036,039.69 - 2,345,131.21 2,021,609.49 4,366,740.70 - -
----------------------------------------------------------------------------------------------------------------------------------
Class Information
--------------------------------------------------------------------------------
Ending Cert. Unpaid
Type Class Code Name Notional Bal. Interest
--------------------------------------------------------------------------------
Senior IA-1 12,756,280.18 0.00
IA-2 18,553,106.85 0.00
IA-3 6,800,000.00 0.00
IA-4 23,800,000.00 0.00
IA-5 42,904,362.89 0.00
IA-6 3,781,966.25 0.00
IA-7 60,893,290.99 0.00
IA-8 11,727,596.78 0.00
IA-9 4,059,552.73 0.00
IA-10 0.00 0.00
IA-11 3,413,113.01 0.00
IA-12 59,500,000.00 0.00
IIA-1 23,714,009.19 0.00
IIA-2 25,828,000.00 0.00
IIA-3 19,183,152.57 0.00
IIA-4 0.00 0.00
IIA-5 0.00 0.00
IIA-6 23,920,722.38 0.00
I-X-1 0.00 0.00
I-X-2 99,314,010.31 0.00
I-X-3 70,972,000.00 0.00
I-X-4 71,749,464.22 0.00
II-X 813,120.96 0.00
I-PO 100,110.83 0.00
II-PO 237,474.25 0.00
Residual R-I 0.00 0.00
R-II 0.00 0.00
R-III 0.00 0.00
--------------------------------------------------------------------------------
Subordinate IM 6,766,499.36 0.00
IB-1 3,108,746.66 0.00
IB-2 1,646,037.74 0.00
IB-3 1,280,360.49 0.00
IB-4 914,683.26 0.00
IB-5 914,680.33 0.00
IIM 1,135,314.28 0.00
IIB-1 417,692.61 0.00
IIB-2 299,009.03 0.00
IIB-3 357,890.81 0.00
IIB-4 179,405.42 0.00
IIB-5 298,907.23 0.00
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
Totals - - 354,709,999.85 -
--------------------------------------------------------------------------------
</TABLE>
<PAGE>
Payment Date: 06/25/00
------------------------------------------------------------
BA MORTGAGE SECURITIES, INC.
Mortgage Pass-Through Certificates, Series 1998-4
BANK OF AMERICA, FSB, MASTER SERVICER
------------------------------------------------------------
<TABLE>
<CAPTION>
Class Information Current Payment Information
Factors per $1,000
------------------------------------------------------------------------------------------------------------------------
Beginning Pass Thru CUSIP Principal Interest Ending Cert./
Type Class Code Name Cert. Bal.(Face) Rate Numbers Dist. Dist. Notional Bal.
------------------------------------------------------------------------------------------------------------------------
<S> <C> <C> <C> <C> <C> <C> <C> <C>
------------------------------------------------------------------------------------------------------------------------
Senior IA-1 13,087,432.32 6.650000% 055240GY5 20.697009 4.532887 797.267511
IA-2 19,211,271.75 6.250000% 055240GZ2 26.326596 4.002348 742.124274
IA-3 6,800,000.00 6.650000% 055240HA6 0.000000 5.541667 1,000.000000
IA-4 23,800,000.00 6.600000% 055240HB4 0.000000 5.500000 1,000.000000
IA-5 43,628,758.21 6.500000% 055240HC2 14.487906 4.726449 858.087258
IA-6 3,862,454.62 6.750000% 055240HD0 0.000000 4.753730 827.496734
IA-7 61,013,622.19 7.110000% 055240HE8 0.916076 2.752128 463.578021
IA-8 11,750,771.68 4.621131% 055240HF5 0.916076 1.788740 463.578021
IA-9 4,067,574.81 7.500000% 055240HG3 0.916076 2.903088 463.578021
IA-10 0.00 6.750000% 055240HH1 0.000000 0.000000 0.000000
IA-11 3,394,021.63 6.750000% 055240HJ7 0.000000 0.000000 1,137.704335
IA-12 59,500,000.00 6.750000% 055240HK4 0.000000 5.625000 1,000.000000
IIA-1 24,069,234.99 6.500000% 055240HL2 13.156511 4.828705 878.296637
IIA-2 25,828,000.00 6.500000% 055240HM0 0.000000 5.416667 1,000.000000
IIA-3 19,183,152.57 6.500000% 055240HN8 0.000000 2.244249 414.322950
IIA-4 0.00 6.500000% 055240HP3 0.000000 0.000000 0.000000
IIA-5 0.00 6.500000% 055240HQ1 0.000000 0.000000 0.000000
IIA-6 24,019,193.99 6.500000% 055240HR9 3.787370 5.003999 920.027784
I-X-1 0.00 0.245114% 055240HS7 0.000000 0.000000 0.000000
I-X-2 100,950,335.98 0.245114% 055240HT5 0.000000 0.180348 868.615399
I-X-3 70,972,000.00 0.245114% 055240HU2 0.000000 0.204262 1,000.000000
I-X-4 71,950,274.17 0.245114% 055240HV0 0.000000 0.091992 449.105632
II-X 816,618.59 6.500000% 055240HW8 0.000000 3.298950 606.428351
I-PO 100,260.75 0.000000% 055240HX6 1.456762 0.000000 972.743108
II-PO 238,531.93 0.000000% 055240HY4 3.628894 0.000000 814.774746
Residual R-I 0.00 6.750000% 055240JF3 0.000000 0.000000 0.000000
R-II 0.00 6.500000% 055240JG1 0.000000 0.000000 0.000000
R-III 0.00 6.750000% 055240JH9 0.000000 0.000000 0.000000
------------------------------------------------------------------------------------------------------------------------
Subordinate IM 6,772,936.74 6.750000% 055240HZ1 0.932684 5.519816 980.367916
IB-1 3,111,704.20 6.750000% 055240JA4 0.932684 5.519816 980.367916
IB-2 1,647,603.71 6.750000% 055240JB2 0.932684 5.519816 980.367919
IB-3 1,281,578.58 6.750000% 055240JJ5 0.932684 5.519816 980.367913
IB-4 915,553.46 6.750000% 055240JK2 0.932684 5.519816 980.367913
IB-5 915,550.52 6.750000% 055240JL0 0.932684 5.519816 980.367919
IIM 1,139,987.90 6.500000% 055240JC0 3.787370 5.003999 920.027780
IIB-1 419,412.08 6.500000% 055240JD8 3.787370 5.003999 920.027777
IIB-2 300,239.92 6.500000% 055240JE6 3.787370 5.003999 920.027773
IIB-3 359,364.10 6.500000% 055240JM8 3.787370 5.003999 920.027792
IIB-4 180,143.95 6.500000% 055240JN6 3.787370 5.003999 920.027782
IIB-5 300,137.70 6.500000% 055240JP1 3.787374 5.004004 920.028771
------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------
Totals - - 357,036,039.69 - - - - -
------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------
</TABLE>
<PAGE>
------------------------------------------------------------
BA MORTGAGE SECURITIES, INC.
Mortgage Pass-Through Certificates, Series 1998-4
BANK OF AMERICA, FSB, MASTER SERVICER
------------------------------------------------------------
--------------------------------------------------------------------------------
COLLATERAL INFORMATION
--------------------------------------------------------------------------------
Total
-----
Prin balance 259,138,422.87 95,571,577.55 354,710,000.42
Loan count 812 290 1102
Avg loan rate 7.425678% 7.023100% 7.32
Prepay amount 1,612,143.64 72,076.10 1,684,219.74
--------------------------------------------------------------------------------
FEES AND ADVANCES
--------------------------------------------------------------------------------
Total
-----
Master serv fees 93,525.51 38,372.87 131,898.38
Sub servicer fees 0.00 0.00 0.00
Trustee fees 978.74 360.14 1,338.89
Agg advances N/A N/A N/A
Adv this period 0.00 0.00 0.00
--------------------------------------------------------------------------------
LOSSES & INSURANCE COVERAGES
--------------------------------------------------------------------------------
Total
-----
Realized losses 0.00 0.00 0.00
Cumulative losses 0.00 0.00 0.00
Coverage Amounts Total
---------------- -----
Bankruptcy 0.00 0.00 0.00
Fraud 3,730,870.14 1,298,233.99 5,029,104.13
Special Hazard 3,064,010.87 1,729,009.82 4,793,020.69
Aggregate Certificate Information
-----------------------------------------------------------------------------
Class Aggregate Aggregate Aggregate
Type Percentage Prepay Pct. End Cert. Bal.
-----------------------------------------------------------------------------
Senior 95.148826% 100.000000% 339,691,826.82
-----------------------------------------------------------------------------
Junior 4.851174% 0.000000% 17,319,227.21
-----------------------------------------------------------------------------
--------------------------------------------------------------------------------
DELINQUENCY INFORMATION
--------------------------------------------------------------------------------
Period Loan Count Ending Stated Balance
------ ---------- ---------------------
30 to 59 days 0 0.00
60 to 89 days 0 0.00
90 or more 0 0.00
Foreclosure 0 0.00
Totals: 0 0.00
--------------------------------------------------------------------------------
<PAGE>
--------------------------------------------------------------------------------
REO INFORMATION
--------------------------------------------------------------------------------
REO Date Loan Number Ending Stated Balance Book Value
-------- ----------- --------------------- ----------
N/A # 0 N/A
N/A # 0 N/A
N/A # 0 N/A
N/A # 0 N/A
N/A # 0 N/A
N/A # 0 N/A
N/A # 0 N/A
N/A # 0 N/A
Totals: 0 N/A
Current Total Outstanding Balance: 0.00
Current Total Outstanding Number of Loans: 0
<PAGE>
--------------------------------------------------------------------------------
OTHER INFORMATION
--------------------------------------------------------------------------------
Amount/Withdrawal Total/Ending Bal.
----------------- -----------------
Available remittance amount 4,366,740.70 4,366,740.70
Principal remittance amount 2,345,131.21 2,345,131.21
Interest remittance amount 2,021,609.49 2,021,609.49
