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EXHIBIT 12.(a).1

CERTIFICATION OF CHIEF
EXECUTIVE OFFICER

I, Tom Wyler, certify that:

1.    
          I have reviewed this annual report on Form 20-F of Optibase Ltd.;

2.    
          Based on my knowledge, this report 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 with respect to the period covered by this report;

3.    
          Based on my knowledge, the financial statements, and other financial information
          included in this report, fairly present in all material respects the financial
          condition, results of operations and cash flows of the company as of, and for,
          the periods presented in this report;

4.    
          The registrants other certifying officer(s) and I are responsible for
          establishing and maintaining disclosure controls and procedures (as defined in
          Exchange Act Rules 13a-15(e) and 15d-15(e)) for the company and have:

| | a. | designed such disclosure controls and procedures, or caused such disclosure
               controls and procedures to be designed under our supervision, to ensure that
               material information relating to the company, including its consolidated
               subsidiaries, is made known to us by others within those entities, particularly
               during the period in which this report is being prepared;
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| | b. | evaluated the effectiveness of the companys disclosure controls and
               procedures and presented in this report our conclusions about the effectiveness
               of the disclosure controls and procedures, as of the end of the period covered
               by this report based on such evaluation; and
| | -- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | c. | disclosed in this report any change in the companys internal control over
               financial reporting that occurred during the period covered by the annual report
               that has materially affected, or is reasonably likely to materially affect, the
               companys internal control over financial reporting; and
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5.    
          The companys other certifying officer(s) and I have disclosed, based on
          our most recent evaluation of internal control over financial reporting, to the
          companys auditors and the audit committee of companys board of
          directors (or persons performing the equivalent function):

| | a. | all significant deficiencies and material weaknesses in the design or operation
               of internal control over financial reporting which are reasonably likely to
               adversely affect the companys ability to record, process, summarize and
               report financial data; and
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| | b. | any fraud, whether or not material, that involves management or other employees
               who have a significant role in the companys internal control over
               financial reporting.
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Date: April 12, 2006

|
Tom WylerChief Executive
Officer
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