| 1. | I                  have reviewed the reports on Form 10-K and all reports on Form                  10-D                  required to be filed in respect of the period covered by this report                  on                  Form 10-K of Citicorp                  Mortgage Securities Trust, Series 2006-4                  (the “Exchange Act periodic                  reports”); |
|----|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| 2. | Based                  on my knowledge, the Exchange Act periodic reports, taken as a                  whole, do                  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                  with                  respect to the period covered by this                  report; |
|----|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| 3. | Based                  on my knowledge, all of the distribution, servicing and other information                  required to be provided under Form 10-D for the period covered                  by the                  report is included in the Exchange Act periodic                  reports; |
|----|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| 4. | I                  am responsible for reviewing the activities performed by the servicer                  and                  based on my knowledge and the compliance reviews conducted in preparing                  the servicer compliance statement required in this report under                  Item 1123                  of Regulation AB, and except as disclosed in the Exchange Act periodic                  reports, the servicer has fulfilled its obligations under the servicing                  agreement; and |
|----|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| 5. | All                  of the reports on assessment of compliance with servicing criteria                  for                  asset backed securities and their related attestation reports on                  assessment of compliance with servicing criteria for asset-backed                  securities required to be included in this report in accordance                  with Item                  1122 of Regulation AB and Exchange Act Rules 13a-18 and 15d-18                  have been                  included as an exhibit to this report, except as otherwise disclosed                  in                  this report. Any material instances of noncompliance described                  in such                  reports have been disclosed in this report on Form                  10-K. |
|----|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|