Exhibit 99.21 GE CAPITAL MORTGAGE SERVICES, INC. SERVICER'S CERTIFICATE August, 1999 Series 1999-11, REMIC Multi-Class Pass-Through Certificates Pursuant to the Pooling and Servicing Agreement dated as of May 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 $ 792,959.03 --------------- (b) Interest $ 5,576,966.79 --------------- (c) Total $ 6,369,925.82 --------------- 2. Aggregate scheduled Monthly Payments received this month: (a) Principal $ 621,444.76 --------------- (b) Interest $ 4,366,844.01 --------------- (c) Total $ 4,988,288.77 --------------- 3. Aggregate Monthly Advances this month: (a) Principal $ 171,514.27 --------------- (b) Interest $ 1,210,122.78 --------------- (c) Total $ 1,381,637.05 --------------- 4. Aggregate Principal Prepayments in part received in the applicable Prepayment Period: (a) Principal $ 157,233.36 --------------- 5. Aggregate Principal Prepayments in full received in the applicable Prepayment Period: (a) Principal $ 2,809,800.94 --------------- (b) Interest $ 16,387.39 --------------- (c) Total $ 2,826,188.33 --------------- 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: $ 931,682,637.50 --------------- 13. Available Funds: $ 9,159,098.30 --------------- 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: $ 1,293.09 --------------- 18. Total interest payments: $ 5,399,105.00 --------------- 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 $ 153,408.89 $ 0.00 $ 153,408.89 %5.950000013 A2 $ 228,536.00 $ 0.00 $ 228,536.00 %6.000000000 A3 $ 892,574.07 $ 0.00 $ 892,574.07 %6.249999980 A4 $ 188,303.45 $ 0.00 $ 188,303.45 %5.463749883 A5 $ 104,641.75 $ 0.00 $ 104,641.75 %3.036249996 A6 $ 1,265,469.75 $ 0.00 $ 1,265,469.75 %6.500000012 A7 $ 807,304.70 $ 0.00 $ 807,304.70 %6.500000035 A8 $ 288,597.53 $ 0.00 $ 288,597.53 %6.500000029 A9 $ 5,475.51 $ 0.00 $ 0.00 %6.500004595 A10 $ 102,533.15 $ 0.00 $ 102,533.15 %6.500000317 A11 $ 36,259.17 $ 0.00 $ 36,259.17 %6.500000598 A12 $ 8,706.67 $ 0.00 $ 8,706.67 %8.000003063 A13 $ 97,830.41 $ 0.00 $ 97,830.41 %5.663749756 A14 $ 48,990.77 $ 0.00 $ 48,990.77 %9.217811872 A15 $ 0.00 $ 0.00 $ 0.00 %0.000000000 A16 $ 8,205.08 $ 0.00 $ 0.00 %6.499997726 A17 $ 27,377.53 $ 0.00 $ 0.00 %6.499999821 A18 $ 31,669.04 $ 0.00 $ 31,669.04 %6.749999467 A19 $ 32,841.97 $ 0.00 $ 32,841.97 %7.000000000 A20 $ 0.00 $ 0.00 $ 0.00 %0.000000000 A21 $ 11,860.87 $ 0.00 $ 0.00 %6.499999338 A22 $ 515,883.47 $ 0.00 $ 515,883.47 %6.500000016 S $ 336,620.40 $ 0.00 $ 336,620.40 %0.454839554 RL $ 0.00 $ 0.00 $ 0.00 %0.000000000 M $ 95,282.60 $ 0.00 $ 95,282.60 %6.500000161 B1 $ 38,626.76 $ 0.00 $ 38,626.76 %6.499999201 B2 $ 23,177.14 $ 0.00 $ 23,177.14 %6.499999887 B3 $ 25,751.18 $ 0.00 $ 25,751.18 %6.500000875 B4 $ 10,301.55 $ 0.00 $ 10,301.55 %6.499998651 B5 $ 12,875.59 $ 0.00 $ 12,875.59 %6.499998605 20. Principal Distribution Amount: $ 3,759,993.30 ------------- 21. Principal Distribution Amount per Certificate: Principal Distribution Accrual Amount ---------------------- -------------- Class R $ 0.00 $ 0.00 Class PO $ 1,271.88 $ 0.00 Class A1 $ 0.00 $ 0.00 Class A2 $ 0.00 $ 0.00 Class A3 $ 0.00 $ 0.00 Class A4 $ 0.00 $ 0.00 Class A5 $ 0.00 $ 0.00 Class A6 $ 1,621,360.99 $ 0.00 Class A7 $ 1,209,446.66 $ 0.00 Class A8 $ 432,356.36 $ 0.00 Class A9 $ 0.00 $ 5,475.51 Class A10 $ 0.00 $ 0.00 Class A11 $ 0.00 $ 0.00 Class A12 $ 0.00 $ 0.00 Class A13 $ 168,202.49 $ 0.00 Class A14 $ 51,754.61 $ 0.00 Class A15 $ 0.00 $ 0.00 Class A16 $ 222,212.56 $ 8,205.08 Class A17 $ 0.00 $ 27,377.53 Class A18 $ 0.00 $ 0.00 Class A19 $ 0.00 $ 0.00 Class A20 $ 0.00 $ 0.00 Class A21 $ 74,070.85 $ 11,860.87 Class A22 $ 0.00 $ 0.00 Class S $ 0.00 $ 0.00 Class RL $ 0.00 $ 0.00 Class M $ 14,909.22 $ 0.00 Class B1 $ 6,044.07 $ 0.00 Class B2 $ 3,626.61 $ 0.00 Class B3 $ 4,029.38 $ 0.00 Class B4 $ 1,611.92 $ 0.00 Class B5 $ 2,014.69 $ 0.00 22. Additional distributions to the Class R Certificate pursuant to the Agreement: $ 0.00 --------------- 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 -------------- 26. The Certificate Interest Rate applicable to the Interest Accrual Period relating to such Distribution Date applicable to any floating index certificate. Class Certificate Interest Rates Class A4 % 5.46374988 Class A5 % 3.03625000 Class A13 % 5.66374976 Class A14 % 9.21781187 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: $ 205,008.02 ----------- 3. Supplemental Servicing Fee amount: $ N/A ----------- 4. Credit Losses for prior month: $ 0.00 ----------- Category A Category B Category C 5. Senior Percentage: % 95.929246 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: %100.000000 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: % 4.070754 ----------- 12. Junior Prepayment Percentage: % 0.000000 ----------- 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