Structured Asset Securities Corporation  Mortgage Pass-Through Certificates, Series
2004-18H
Distribution Date:          12/27/2004
Record Date:                11/30/2004

Distribution Summary

DISTRIBUTION IN DOLLARS

                                                  Prior         Pass-                                                                                  Current
                            Original              Principal     Through       Interest   Principal   Total          Deferred               Realized    Principal
Class                       Balance               Balance       Rate          DistributedDistributed Distributed    Interest               Loss        Balance
(1)                         (2)                   (3)           (4)           (5)        (6)         (7)=(5+6)      (8)                    (9)         (10)=(3-6+8-9)

A1                          28,267,000.00         26,782,305.10 3.220000%     71,865.85  1,097,264.651,169,130.50   0.00                   0.00        25,685,040.45

A2                          50,000,000.00         47,373,801.77 4.180000%     165,018.74 1,940,893.362,105,912.10   0.00                   0.00        45,432,908.41

A3                          42,319,000.00         42,319,000.00 4.750000%     167,512.71 0.00        167,512.71     0.00                   0.00        42,319,000.00

A4                          28,192,000.00         28,192,000.00 4.620000%     108,539.20 0.00        108,539.20     0.00                   0.00        28,192,000.00

A5                          42,835,000.00         42,835,000.00 4.750000%     169,555.21 0.00        169,555.21     0.00                   0.00        42,835,000.00

B1                          4,798,000.00          4,788,713.76  4.770000%     19,035.14  4,684.49    23,719.63      0.00                   0.00        4,784,029.27

B2                          1,799,000.00          1,795,518.14  4.770000%     7,137.18   1,756.44    8,893.62       0.00                   0.00        1,793,761.70

B3                          799,000.00            797,453.59    4.770000%     3,169.88   780.10      3,949.98       0.00                   0.00        796,673.49

B4                          500,000.00            499,032.28    4.770000%     1,983.65   488.17      2,471.82       0.00                   0.00        498,544.11

B5                          200,000.00            199,612.92    4.770000%     793.46     195.27      988.73         0.00                   0.00        199,417.65

B6                          200,513.00            200,125.29    4.770000%     795.50     195.71      991.21         0.00                   0.00        199,929.58

R                           100.00                0.00          4.770000%     0.00       0.00        0.00           0.00                   0.00        0.00

Totals                      199,909,613.00        195,782,562.85              715,406.52 3,046,258.193,761,664.71   0.00                   0.00        191,041,739.83

Notional Classes

AIO1                        245,944,983.00        239,174,348.571.000000%     199,311.96 0.00        199,311.96     0.00                   0.00        235,016,565.53

AIO2                        79,245,730.00         75,394,995.95 1.000000%     62,829.16  0.00        62,829.16      0.00                   0.00        72,549,108.66

Totals                      325,190,713.00        314,569,344.52              262,141.12 0.00        262,141.12     0.00                   0.00        0.00

Distribution Summary (Factors)

PER $1,000 OF ORIGINAL BALANCE

                                                  Prior                                                                                    Current
                                                  Principal     Interest      Principal  Total       Deferred       Realized               Principal
                                                                Distributed
Class                       CUSIP                 Balance       (5/2 x 1000)  DistributedDistributed Interest       Loss                   Balance
                                                  (3/2 x 1000)                (6/2 x     (7/2 x 1000)(8/2 x 1000)   (9/2 x 1000)           (10/2 x
                                                                              1000)                                                        1000)

A1                          86359BE49             947.476036    2.542394      38.817867  41.360261   0.000000       0.000000               908.658169

A2                          86359BE56             947.476035    3.300375      38.817867  42.118242   0.000000       0.000000               908.658168

A3                          86359BE64             1,000.000000  3.958333      0.000000   3.958333    0.000000       0.000000               1,000.000000

A4                          86359BE72             1,000.000000  3.850000      0.000000   3.850000    0.000000       0.000000               1,000.000000

A5                          86359BG54             1,000.000000  3.958333      0.000000   3.958333    0.000000       0.000000               1,000.000000

B1                          86359BF30             998.064560    3.967307      0.976342   4.943649    0.000000       0.000000               997.088218

B2                          86359BF48             998.064558    3.967304      0.976342   4.943646    0.000000       0.000000               997.088216

B3                          86359BF55             998.064568    3.967309      0.976345   4.943655    0.000000       0.000000               997.088223

B4                          86359BF71             998.064560    3.967300      0.976340   4.943640    0.000000       0.000000               997.088220

B5                          86359BF89             998.064600    3.967300      0.976350   4.943650    0.000000       0.000000               997.088250

B6                          86359BF97             998.066410    3.967324      0.976046   4.943370    0.000000       0.000000               997.090363

R                           86359BF63             0.000000      0.000000      0.000000   0.000000    0.000000       0.000000               0.000000

AIO1                        86359BE80             972.470939    0.810392      0.000000   0.810392    0.000000       0.000000               955.565601

AIO2                        86359BE98             951.407678    0.792840      0.000000   0.792840    0.000000       0.000000               915.495493

Interest Distribution Detail

DISTRIBUTION IN DOLLARS

                            Prior                 Pass-         Optimal       Prior      Non-Recov                                                     Current
                            Principal             Through       Accrued       Unpaid     Interest    Interest       Deferred               Interest    Unpaid
                                                                                                                                           Distributed
Class                       Balance               Rate          Interest      Interest   Shortfall   Due            Interest               (9)         Interest
(1)                         (2)                   (3)           (4)           (5)        (6)         (7)=(4)+(5)-(6)(8)                                (10)=(7)-(8)-(9)

A1                          26,782,305.10         3.220000%     71,865.85     0.00       0.00        71,865.85      0.00                   71,865.85   0.00

A2                          47,373,801.77         4.180000%     165,018.74    0.00       0.00        165,018.74     0.00                   165,018.74  0.00

A3                          42,319,000.00         4.750000%     167,512.71    0.00       0.00        167,512.71     0.00                   167,512.71  0.00

A4                          28,192,000.00         4.620000%     108,539.20    0.00       0.00        108,539.20     0.00                   108,539.20  0.00

A5                          42,835,000.00         4.750000%     169,555.21    0.00       0.00        169,555.21     0.00                   169,555.21  0.00

B1                          4,788,713.76          4.770000%     19,035.14     0.00       0.00        19,035.14      0.00                   19,035.14   0.00

B2                          1,795,518.14          4.770000%     7,137.18      0.00       0.00        7,137.18       0.00                   7,137.18    0.00

B3                          797,453.59            4.770000%     3,169.88      0.00       0.00        3,169.88       0.00                   3,169.88    0.00

B4                          499,032.28            4.770000%     1,983.65      0.00       0.00        1,983.65       0.00                   1,983.65    0.00

B5                          199,612.92            4.770000%     793.46        0.00       0.00        793.46         0.00                   793.46      0.00

B6                          200,125.29            4.770000%     795.50        0.00       0.00        795.50         0.00                   795.50      0.00

R                           0.00                  4.770000%     0.00          0.00       0.00        0.00           0.00                   0.00        0.00

  Totals                    195,782,562.85                      715,406.52    0.00       0.00        715,406.52     0.00                   715,406.52  0.00

Notional Classes

AIO1                        239,174,348.57        1.000000%     199,311.96    0.00       0.00        199,311.96     0.00                   199,311.96  0.00

AIO2                        75,394,995.95         1.000000%     62,829.16     0.00       0.00        62,829.16      0.00                   62,829.16   0.00

  Totals                    314,569,344.52                      262,141.12    0.00       0.00        262,141.12     0.00                   262,141.12  0.00

Principal Distribution
Detail

DISTRIBUTION IN DOLLARS

                                                  Prior                                  Current     Current        Current                Cumulative
                            Original              Principal     Principal     Accreted   Realized    Principal      Principal              Realized
Class                       Balance               Balance       Distribution  Principal  Losses      Recoveries     Balance                Losses
(1)                         (2)                   (3)           (4)           (5)        (6)         (7)            (8)=(3)-(4)+(5)-(6)+(7)(9)

A1                          28,267,000.00         26,782,305.10 1,097,264.65  0.00       0.00        0.00           25,685,040.45          0.00

A2                          50,000,000.00         47,373,801.77 1,940,893.36  0.00       0.00        0.00           45,432,908.41          0.00

A3                          42,319,000.00         42,319,000.00 0.00          0.00       0.00        0.00           42,319,000.00          0.00

A4                          28,192,000.00         28,192,000.00 0.00          0.00       0.00        0.00           28,192,000.00          0.00

A5                          42,835,000.00         42,835,000.00 0.00          0.00       0.00        0.00           42,835,000.00          0.00

B1                          4,798,000.00          4,788,713.76  4,684.49      0.00       0.00        0.00           4,784,029.27           0.00

B2                          1,799,000.00          1,795,518.14  1,756.44      0.00       0.00        0.00           1,793,761.70           0.00

B3                          799,000.00            797,453.59    780.10        0.00       0.00        0.00           796,673.49             0.00

B4                          500,000.00            499,032.28    488.17        0.00       0.00        0.00           498,544.11             0.00

B5                          200,000.00            199,612.92    195.27        0.00       0.00        0.00           199,417.65             0.00

B6                          200,513.00            200,125.29    195.71        0.00       0.00        0.00           199,929.58             0.00

R                           100.00                0.00          0.00          0.00       0.00        0.00           0.00                   0.00

  Totals                    199,009,000.00        195,782,562.853,046,258.19  711,833.91 3,045,379.040.00           192,736,304.66         0.00

Collateral Summary

ASSET CHARACTERISTICS

                            Cut-Off               Prior         Current

Aggregate Stated Principal
Balance                     199,909,613.33        195,782,562.80192,736,304.56

Loan Count                  1,597                 1,572         1,553

Weighted Average Coupon Rate
(WAC)                       6.298720%             6.291694%     N/A

Net Weighted Average Coupon
Rate (Net WAC)              6.042220%             5.991633%     N/A

Weighted Average Maturity
(WAM in months)             0                     352           351

AVAILABLE PRINCIPAL         AVAILABLE INTEREST

Scheduled Interest          1,026,503.46
Curtailments                30,434.48
Less:                       Master Servicing Fees 0.00
Sub Servicing Fees          40,788.05
Trustee Fees                1,060.61
Insurance Fees              7,107.22
Uncompensated PPIS          0.00
Relief Act Shortfall        0.00
Other Interest Reductions   0.00
Current Realized Losses     0.00
TOTAL AVAILABLE INTEREST    977,547.58

Delinquency Information

Less Than
1 Month                     1 Month               2 Months      3+ Months     Totals

Delinquency

Scheduled Principal Balance 155,806.83            88,056.25     0.00          243,863.08
Percentage of Total Pool
Balance                     0.0808%               0.0457%       0.0000%       0.1265%
Number of Loans             2                     1             0             3

Percentage of Total Loans   0.1288%               0.0644%       0.0000%       0.1932%
Bankruptcy

Scheduled Principal Balance 76,745.79             0.00          0.00          86,346.08  163,091.87
Percentage of Total Pool
Balance                     0.0398%               0.0000%       0.0000%       0.0448%    0.0846%

Number of Loans             1                     0             0             1          2
Percentage of Total Loans   0.0644%               0.0000%       0.0000%       0.0644%    0.1288%

Foreclosure

Scheduled Principal Balance                       0.00          37,787.77     0.00       37,787.77
Percentage of Total Pool Balance                  0.0000%       0.0196%       0.0000%    0.0196%

Number of Loans                                   0             1             0          1
Percentage of Total Loans                         0.0000%       0.0644%       0.0000%    0.0644%

REO

Scheduled Principal Balance                       0.00          0.00          0.00       0.00
Percentage of Total Pool Balance                  0.0000%       0.0000%       0.0000%    0.0000%

Number of Loans                                   0             0             0          0
Percentage of Total Loans                         0.0000%       0.0000%       0.0000%    0.0000%

Total

Scheduled Principal Balance 76,745.79             155,806.83    125,844.02    86,346.08  444,742.72
Percentage of Total Pool
Balance                     0.0398%               0.0808%       0.0653%       0.0448%    0.2308%

Number of Loans             1                     2             2             1          6
Percentage of Total Loans   0.0644%               0.1288%       0.1288%       0.0644%    0.3863%

Principal and Interest
Advances                    709,773.40

Other Information

          Current Bankruptcy
Loss                        0.00
          Cumulative
Bankruptcy Loss             0.00
          Remaining
Bankruptcy Loss Limit       119,910.00

          Current Fraud Loss0.00
          Cumulative Fraud
Loss                        0.00
          Remaining Fraud
Loss Limit                  3,998,192.00

          Current Special
Hazard Loss Limit           0.00
          Cumulative Special
Hazard Loss Limit           0.00
          Remaining Special
Hazard Loss Limit           2,099,051.00

CONTACT INFORMATION         CONTENTS

Distribution Summary        2
Depositor                   Structured Asset
                            Securities Corporation
Distribution Summary
(Factors)                   2

New York, NY  10019
Interest Distribution       2
Underwriter                 Lehman Brothers
745 Seventh Avenue, 7th
Floor
Principal Distribution      2
New York, NY  10019

Collateral Summary          2
2530 South Parker Road, Suite 601

Delinquency Information     2

Trustee                     Citibank, N.A.
Other Information           2

New York, NY  10013

Deal Contact:               Karen Schluter        Citibank, N.A.
karen.schluter@citigroup.com                      Agency and
                                                  Trust
                                                  388 Greenwich
Tel: (212) 816-5827                               Street, 14th
                                                  Floor
Fax: (212) 816-5527                               New York, NY
                                                  10013

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                            www.sf.citidirect.com 2004 Citigroup

Structured Asset Securities Corp 2004-18H 8-K