**Exhibit      31.1**

**CERTIFICATION**

|   | 1. | I                have reviewed this annual report on Form 10-K, and all reports on                Form 8-K                containing distribution or servicing reports filed in respect of                periods                included in the year covered by this annual report, of Corporate                Backed                Trust Certificates, AT&T Note-Backed Series 2003-18                Trust** **(the“Trust”); |
|--------|----|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|   | 2. | Based                on my knowledge, the information in these reports, taken as a whole,                does                not contain any untrue statement of a material fact or omit to state                a                material fact necessary to make the statements made, in light of                the                circumstances under which such statements were made, not misleading                as of                the last day of the period covered by this annual                report; |
|--------|----|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|   | 3. | Based                on my knowledge, the distribution or servicing information required                to be                provided to the Depositor by the Trustee under the pooling and servicing,                or similar, agreement, for inclusion in these reports is included                in these                reports; |
|--------|----|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|   | 4. | I                am responsible for reviewing the activities performed by the Depositor                and                the Trustee under the pooling and servicing, or similar, agreement                and                based upon my knowledge and the annual compliance review required                under                that agreement, and except as disclosed in the reports, the Depositor                and                Trustee have each fulfilled its obligations under that agreement;                and |
|--------|----|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|   | 5. | The                reports disclose all significant deficiencies relating to the compliance                by the Trustee and the Depositor with the minimum servicing or similar                standards based upon the report provided by an independent public                accountant, after conducting a review in compliance with the Uniform                Single Attestation Program for Mortgage Bankers or similar procedure,                as                set forth in the pooling and servicing, or similar, agreement, that                is                included in these reports. |
|--------|----|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|