SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                                  SCHEDULE 13D
           Under the Securities Exchange Act of 1934 (Amendment No. 1)

                                  OPTIBASE LTD.
                                  -------------
                                (Name of Issuer)

                                 Ordinary Shares
                                 ---------------
                         (Title of Class of Securities)

                                    M7524R108
                                    ---------
                                 (CUSIP Number)

                             Linda C. Williams, Esq.
                             Pillsbury Winthrop LLP
                                50 Fremont Street
                             San Francisco, CA 94105
                            Telephone: (415) 983-7334
                            -------------------------
                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)

                                January 15, 2002
             (Date of Event which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report
the acquisition that is the subject of this Schedule 13D, and is filing this
schedule because of ss.ss. 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the
following box [ ]. NOTE: Schedules filed in paper format shall include a signed
original and five copies of the schedule, including all exhibits. See Rule
240.13d-7 for other parties to whom copies are to be sent.
*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter
disclosures provided in a prior cover page.
The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 (the "Act") or otherwise subject to the liabilities of that section of the
Act but shall be subject to all other provisions of the Act (however, see the
Notes).


                               Page 1 of 6 Pages





                                                                                               


1.         NAMES OF REPORTING PERSONS:                                                                  JOHN KROOSS
           I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (entities only):                              Not applicable
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2.         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                                                 (a) /_/
                                                                                                            (b) /X/
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3.         SEC USE ONLY

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                                                                                                                 OO
4.         SOURCE OF FUNDS:

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5          CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)               /_/

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                                                                                                       U.S. CITIZEN
6.         CITIZENSHIP OR PLACE OF ORGANIZATION:

-------------------------------------------------------------------------------------------------------------------
                                                                                                            693,438
                               7.     SOLE VOTING POWER:
          NUMBER OF
                               ------------------------------------------------------------------------------------
           SHARES              8.     SHARED VOTING POWER:
        BENEFICIALLY
                               ------------------------------------------------------------------------------------
        OWNED BY EACH          9.     SOLE DISPOSITIVE POWER:                                               693,438
          REPORTING
                               ------------------------------------------------------------------------------------
         PERSON WITH           10.    SHARED DISPOSITIVE POWER:

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                                                                                                            693,438
11.        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
           REPORTING PERSON:

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12.        CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11)
           EXCLUDES CERTAIN SHARES                                                                              /_/

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                                                                                                               5.5%
13.        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW
           (11):

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14.        TYPE OF REPORTING PERSON:                                                                            IN

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                               Page 2 of 6 Pages





ITEM 1.   Security and Issuer.
          -------------------

          This Statement relates to ordinary shares,  par value NIS 0.13 per
          share ("Ordinary  Shares"),  of Optibase  Ltd.  (the  "Issuer").  The
          address of the  Issuer's  principal  executive  offices is 7 Shenkar
          St., P.O. Box 2170, Herzliya, 46210 Israel.

ITEM 2.   Identity and Background.
          -----------------------

          This  Statement is being filed by John Krooss,  an  individual.  His
          residential  address is 2868 Vallejo Street,  San Francisco,
          California 94123. Mr. Krooss not currently  employed.  Mr. Krooss
          is a citizen of the United States of America.

          During the past five years, Mr. Krooss has not been (i)
          convicted in any criminal proceeding; or (ii) been party to
          any civil proceeding of a judicial or administrative body of
          competent jurisdiction as a result of which Mr. Krooss was or
          is subject to any judgment, decree or final order enjoining
          future violations of, or prohibiting or mandating activities
          subject to, federal or state securities laws or finding any
          violation with respect to such laws.

ITEM 3.   Source and Amount of Funds or Other Consideration.
          -------------------------------------------------

          Pursuant to the Agreement and Plan of Reorganization, dated
          as of December 4, 2000 (the "Merger Agreement"), by and among
          Issuer, Vodka Acquisition Corp. ("Sub"), a Delaware
          corporation and a wholly-owned subsidiary of Optibase Inc.,
          which in turn is a wholly-owned subsidiary of Issuer,
          Viewgraphics Incorporated, a California S corporation (the
          "Company"), John Krooss, an individual ("John Krooss"), and
          the Krooss 2000 Children's Trust, a California trust for the
          benefit of the John Krooss' children, of which Anne Libbin is
          trustee, the Sub was merged with and into the Company, the
          separate corporate existence of Sub ceased and the Company
          continues as the surviving corporation and as a wholly-owned
          subsidiary of Optibase Inc. (the "Merger"). On December 4,
          2000, as a result of the Merger, John Krooss received a total
          of 302,378 Ordinary Shares. In addition, 747,323 Ordinary
          Shares were placed in escrow which Mr. Krooss could vote, but
          were subject to the terms of the Escrow Agreement, dated as
          of December 4, 2000, as amended on as of March 27, 2001 (the
          "Escrow Agreement"), by and among Issuer, John Krooss, the
          Company and American Stock Transfer & Trust Company, as
          escrow agent and transfer agent.

          On January 15, 2002, in settlement of Merger related claims
          under the Escrow Agreement, Mr. Krooss forfeited his
          contingent right to receive 251,285 Ordinary Shares, 322,857
          Ordinary Shares were released from escrow to Mr. Krooss and
          68,203 Ordinary Shares remain in escrow and subject to the
          terms of the Escrow Agreement.

          Mr. Krooss is a Director of the Issuer.


                               Page 3 of 6 Pages




ITEM 4.   Purpose of the Transaction.
          --------------------------

          Mr. Krooss will hold the Ordinary Shares as an investment. In
          addition to the provisions of the Escrow Agreement, the
          Ordinary Shares were issued pursuant to an exemption under
          the Securities Act of 1933, and therefore are subject to
          restrictions on public resale absent registration. Depending
          on Mr. Krooss' evaluation of market conditions, market price,
          alternative investment opportunities, liquidity needs and
          other factors, Mr. Krooss will from time to time explore
          opportunities for liquidating all or a portion of the
          Ordinary Shares, subject to the limitations described above,
          through one or more sales pursuant to public or private
          offerings or otherwise. In such event, Mr. Krooss may
          determine to retain some portion of the Ordinary Shares as an
          investment.

ITEM 5.   Interest in Securities of the Issuer.
          ------------------------------------

          The information contained in Item 4 is incorporated herein by
          this reference.

          (a)  Number of Shares Beneficially Owned:               See Item 4

               Right to Acquire:

               Percent of Class:

          (b)  Sole Power to Vote, Direct the Vote of, or         See Item 4
               Dispose of Shares:

          (c)  Recent Transactions:                               Not applicable

          (d)  Rights with Respect to Dividends or Sales          Not applicable
               Proceeds:

          (e)  Date of Cessation of Five Percent Beneficial       Not applicable
               Ownership:

ITEM 6.   Contracts, Arrangements, Understandings or Relationships with Respect
          ---------------------------------------------------------------------
          to Securities of the Issuer.
          ---------------------------

          The information contained in Item 4 is incorporated herein by
          reference. Exhibits 1 and 2 set forth the Merger Agreement
          and the Escrow Agreement

ITEM 7.   Material to be Filed as Exhibits.
          --------------------------------

          Exhibit 1*             Agreement and Plan of Reorganization
          Exhibit 2*             Escrow Agreement
*Previously filed


                               Page 4 of 6 Pages





SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify
that the information set forth in this statement is true, complete and correct.

Dated as of February 11, 2002



                                             /s/ John R. Krooss
                                  ----------------------------------------------
                                                 JOHN KROOSS


                               Page 5 of 6 Pages





                                  EXHIBIT INDEX
                                  -------------


Exhibit No.          Document
-----------          --------

Exhibit 1* Agreement and Plan of Reorganization, dated as of December 4, 2000

Exhibit 2* Escrow Agreement, dated as of December 4, 2000

*Previously filed


                               Page 6 of 6 Pages