Exhibit 99.31 GE CAPITAL MORTGAGE SERVICES, INC. SERVICER'S CERTIFICATE September, 1999 Series 1999-15, REMIC Multi-Class Pass-Through Certificates Pursuant to the Pooling and Servicing Agreement dated as of July 1, 1999 (the "Agreement") between GE Capital Mortgage Services, Inc. (the "Company") and State Street Bank (the "Trustee"), governing the Certificates referred to above, the Company hereby certifies to the Trustee: With respect to the Agreement and as of the Determination Date for this month: A. Mortgage Loan Information: 1. Aggregate scheduled Monthly Payments: (a) Principal $ 804,230.12 --------------- (b) Interest $ 5,995,592.48 --------------- (c) Total $ 6,799,822.60 --------------- 2. Aggregate scheduled Monthly Payments received this month: (a) Principal $ 640,537.11 --------------- (b) Interest $ 4,760,308.15 --------------- (c) Total $ 5,400,845.26 --------------- 3. Aggregate Monthly Advances this month: (a) Principal $ 163,693.01 --------------- (b) Interest $ 1,235,284.33 --------------- (c) Total $ 1,398,977.34 --------------- 4. Aggregate Principal Prepayments in part received in the applicable Prepayment Period: (a) Principal $ 181,590.69 --------------- 5. Aggregate Principal Prepayments in full received in the applicable Prepayment Period: (a) Principal $ 4,534,154.34 --------------- (b) Interest $ 29,360.88 --------------- (c) Total $ 4,563,515.22 --------------- 6. Aggregate Insurance Proceeds received: (a) Principal $ 0.00 --------------- (b) Interest $ 0.00 --------------- (c) Total $ 0.00 --------------- 7. Aggregate Liquidation Proceeds received: (a) Principal $ 0.00 --------------- (b) Interest $ 0.00 --------------- (c) Total $ 0.00 --------------- 8. Aggregate Deficient Valuations with respect to the Mortgage Loans during the prior month: $ 0.00 --------------- 9. Aggregate Debt Service Reductions with respect to the Mortgage Loans during the prior month: $ 0.00 --------------- 10. Aggregate Purchase Prices for Defaulted Mortgage Loans: (a) Principal $ 0.00 --------------- (b) Interest $ 0.00 --------------- (c) Total $ 0.00 --------------- 11. Aggregate Purchase Prices for Defective Mortgage Loans: (a) Principal $ 0.00 --------------- (b) Interest $ 0.00 --------------- (c) Total $ 0.00 --------------- 12. Pool Scheduled Principal Balance: $ 991,155,690.68 --------------- 13. Available Funds: $ 11,344,863.17 --------------- 14. Realized Losses for prior month: $ 0.00 --------------- 15. Aggregate Realized Losses (a) Aggregate Realized Losses: $ 0.00 ------------------------ (b) Deficient Valuations: $ 0.00 ------------------------ (c) Debt Service Reductions: $ 0.00 ------------------------ (d) Bankruptcy Losses: $ 0.00 ------------------------ (e) Special Hazard Losses: $ 0.00 ------------------------ (f) Fraud Losses: $ 0.00 ------------------------ (g) Excess Bankruptcy Losses: $ 0.00 ------------------------ (h) Excess Special Hazard Losses: $ 0.00 ------------------------ (i) Excess Fraud Losses: $ 0.00 ------------------------ 16. Non-Credit Losses: $ 0.00 ---------------- 17. Compensating Interest Payment: $ 3,622.95 ---------------- 18. Total interest payments: $ 5,824,888.01 ---------------- 19. Interest Unpaid Class Accrued Certificate Interest Shortfalls Interest Class Interest Payable Pay-out Rate - ----- -------- ------------------- ------- ------------ R $ 0.00 $ 0.00 $ 0.00 %0.000000000 PO $ 0.00 $ 0.00 $ 0.00 %0.000000000 A1 $ 449,138.79 $ 0.00 $ 449,138.79 %6.749999968 A2 $ 240,163.83 $ 0.00 $ 240,163.83 %6.750000000 A3 $ 276,760.43 $ 0.00 $ 276,760.43 %6.749999958 A4 $ 149,209.59 $ 0.00 $ 149,209.59 %6.999999961 A5 $ 28,125.00 $ 0.00 $ 28,125.00 %6.750000000 A6 $ 7,000.00 $ 0.00 $ 7,000.00 %7.000000000 A7 $ 1,750.00 $ 0.00 $ 1,750.00 %7.000000000 A8 $ 1,750.00 $ 0.00 $ 1,750.00 %7.000000000 A9 $ 1,750.00 $ 0.00 $ 1,750.00 %7.000000000 A10 $ 5,250.00 $ 0.00 $ 5,250.00 %7.000000000 A11 $ 21,875.00 $ 0.00 $ 21,875.00 %7.000000000 A12 $ 217,383.83 $ 0.00 $ 217,383.83 %6.999999893 A13 $ 556,117.22 $ 0.00 $ 556,117.22 %6.750000017 A14 $ 0.00 $ 0.00 $ 0.00 %0.000000000 A15 $ 8,830.78 $ 0.00 $ 8,830.78 %7.250001710 A16 $ 700,009.82 $ 0.00 $ 700,009.82 %6.749999956 A17 $ 379,116.41 $ 0.00 $ 379,116.41 %7.000000062 A18 $ 30,208.33 $ 0.00 $ 30,208.33 %7.249999200 A19 $ 60,416.67 $ 0.00 $ 60,416.67 %7.250000400 A20 $ 30,208.33 $ 0.00 $ 30,208.33 %7.249999200 A21 $ 140,577.14 $ 0.00 $ 140,577.14 %7.249999817 A22 $ 122,927.72 $ 0.00 $ 122,927.72 %6.749999870 A23 $ 172,828.97 $ 0.00 $ 172,828.97 %6.750000049 A24 $ 228,611.43 $ 0.00 $ 0.00 %6.749999885 A25 $ 520,965.87 $ 0.00 $ 520,965.87 %6.749999976 A26 $ 3,403.13 $ 0.00 $ 3,403.13 %6.750009917 A27 $ 305,141.89 $ 0.00 $ 305,141.89 %6.750000091 A28 $ 294,695.44 $ 0.00 $ 294,695.44 %6.750000057 2A1 $ 234,209.89 $ 0.00 $ 234,209.89 %6.749999992 2A2 $ 56,362.50 $ 0.00 $ 56,362.50 %7.500000000 2A3 $ 0.00 $ 0.00 $ 0.00 %0.000000000 2A4 $ 56,360.62 $ 0.00 $ 56,360.62 %7.500000166 2A5 $ 40,696.57 $ 0.00 $ 40,696.57 %6.749999793 1S $ 221,485.45 $ 0.00 $ 221,485.45 %0.365022256 2S $ 21,595.96 $ 0.00 $ 21,595.96 %0.360010843 M $ 118,564.77 $ 0.00 $ 118,564.77 %6.750000222 B1 $ 42,344.96 $ 0.00 $ 42,344.96 %6.749999873 B2 $ 25,404.73 $ 0.00 $ 25,404.73 %6.750000455 B3 $ 28,226.23 $ 0.00 $ 28,226.23 %6.750000759 B4 $ 11,291.61 $ 0.00 $ 11,291.61 %6.749997119 B5 $ 14,129.09 $ 0.00 $ 14,129.09 %6.750000087 20. Principal Distribution Amount: $ 5,519,975.16 --------------- 21. Principal Distribution Amount per Certificate: Principal Distribution Accrual Amount ---------------------- -------------- Class R $ 0.00 $ 0.00 Class PO $ 7,652.22 $ 0.00 Class A1 $ 804,093.47 $ 0.00 Class A2 $ 210,137.80 $ 0.00 Class A3 $ 551,335.05 $ 0.00 Class A4 $ 0.00 $ 0.00 Class A5 $ 0.00 $ 0.00 Class A6 $ 0.00 $ 0.00 Class A7 $ 0.00 $ 0.00 Class A8 $ 0.00 $ 0.00 Class A9 $ 0.00 $ 0.00 Class A10 $ 0.00 $ 0.00 Class A11 $ 0.00 $ 0.00 Class A12 $ 0.00 $ 0.00 Class A13 $ 783,897.48 $ 0.00 Class A14 $ 0.00 $ 0.00 Class A15 $ 0.00 $ 0.00 Class A16 $ 2,004,482.96 $ 0.00 Class A17 $ 0.00 $ 0.00 Class A18 $ 0.00 $ 0.00 Class A19 $ 0.00 $ 0.00 Class A20 $ 0.00 $ 0.00 Class A21 $ 0.00 $ 0.00 Class A22 $ 228,611.43 $ 0.00 Class A23 $ 0.00 $ 0.00 Class A24 $ 0.00 $ 228,611.43 Class A25 $ 0.00 $ 0.00 Class A26 $ 0.00 $ 0.00 Class A27 $ 804,093.47 $ 0.00 Class A28 $ 0.00 $ 0.00 Class 2A1 $ 319,878.45 $ 0.00 Class 2A2 $ 0.00 $ 0.00 Class 2A3 $ 0.00 $ 0.00 Class 2A4 $ 0.00 $ 0.00 Class 2A5 $ 0.00 $ 0.00 Class 1S $ 0.00 $ 0.00 Class 2S $ 0.00 $ 0.00 Class M $ 16,999.12 $ 0.00 Class B1 $ 6,071.17 $ 0.00 Class B2 $ 3,642.38 $ 0.00 Class B3 $ 4,046.91 $ 0.00 Class B4 $ 1,618.93 $ 0.00 Class B5 $ 2,025.75 $ 0.00 22. Additional distributions to the Class R Certificate pursuant to the Agreement: $ 0.01 --------------- 23. Additional distributions to the Class RL Certificate pursuant to the Agreement: $ 0.00 --------------- 24. Subordinate Certificate Writedown Amount: $ 0.00 --------------- Accumulative Class Supported Shortfall Supported Shortfall ----- ------------------- ------------------- B1 $ 0.00 $ 0.00 B2 $ 0.00 $ 0.00 B3 $ 0.00 $ 0.00 B4 $ 0.00 $ 0.00 B5 $ 0.00 $ 0.00 25. Unanticipated Recoveries: $ 0.00 --------------- B. Other Amounts for such Distribution Date: 1. Prepayment Distribution Triggers satisfied: Yes No --- -- Class-B1 X Class-B2 X Class-B3 X Class-B4 X Class-B5 X 2. Base Servicing Fee amount: $ 191,139.99 ------------ 3. Supplemental Servicing Fee amount: $ N/A ------------ 4. Credit Losses for prior month: $ 0.00 ------------ Category A Category B Category C 5. Senior Percentage: % N/A N/A N/A N/A ----- ---- ------- -------- 6. Group I Senior Percentage: % N/A N/A N/A N/A ----- ---- ------- -------- 7. Group II Senior Percentage: % N/A N/A N/A N/A ----- ---- ------- -------- 8. Senior Prepayment Percentage: % N/A N/A N/A N/A ----- ---- ------- -------- 9. Group I Senior Prepayment Percentage: % N/A N/A N/A N/A ----- ---- ------- -------- 10. Group II Senior Prepayment Percentage: % N/A N/A N/A N/A ----- ---- ------- -------- 11. Junior Percentage: % N/A ----- 12. Junior Prepayment Percentage: % N/A ----- Capitalized terms used in this Certificate shall have the same meanings as in the Agreement. GE CAPITAL MORTGAGE SERVICES, INC. By: /s/Tim Neer ------------------------------- Tim Neer Vice President Investor Operations