INSURED MUNICIPALS INCOME TRUST 233RD INSURED MULTI SERIES
487, 1998-07-29
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                              Memorandum of Changes
                         Insured Municipals Income Trust
                           233rd Insured Multi-Series
          
    The Prospectus filed with Amendment No. 1 of the Registration Statement on
Form S-6 has been revised to reflect information regarding the deposit of the
Trusts.
          
    This Prospectus filed with Amendment No. 1 of the Registration Statement on
Form S-6 has been revised to reflect information regarding the deposit of the
Trusts. All page numbers below refer to Prospectus Part I.
     
Cover Page.  The Trust name, Estimated Current Return, Estimated
             Long-Term Return, CUSIP number and date of the prospectus have been
             completed.

Page 2.      The "Summary of Essential Financial Information" has been
             completed.

Pages 3-4.   The "Portfolio" and the notes thereto have  been
             completed.

Page 6.      The Underwriters have been named.

Page 7.      The "Report of Independent Certified Public Accountants and
             "Statement of Condition" has been completed.

Back Cover Page.  The name of the Fund, Trust and date of the
                  prospectus has been completed.

                                                              File No. 333-45259
                                                                     CIK #896404

                   Securities and Exchange Commission
                      Washington, D.C.  20549-1004

                             Amendment No. 1
                                   To
                                Form S-6

For Registration under the Securities Act of 1933 of Securities of Unit
Investment Trusts Registered on Form N-8B-2.

A. Exact Name of Trust:  Insured Municipals Income Trust, 233rd Insured Multi-
                         Series

B. Name of Depositor:    Van Kampen Funds Inc.

C. Complete address of Depositor's principal executive offices:

   One Parkview Plaza
   Oakbrook Terrace, Illinois  60181

D. Name and complete address of agents for service:

   Chapman and Cutler              Van Kampen Funds Inc.
   Attention:  Mark J. Kneedy      Attention:  Don G. Powell, Chairman
   111 W. Monroe Street            One Parkview Plaza
   Chicago, Illinois  60603        Oakbrook Terrace, Illinois  60181

E. Title of securities being registered:  Units of fractional undivided
   beneficial interest.

F. Approximate date of proposed sale to the public:
                                   
  As Soon As Practicable After The Effective Date Of The Registration Statement

/ X / Check  box if it is proposed that this filing will become effective
- -----  on July 29, 1998 pursuant to Rule 487.

                    Insured Municipals Income Trust,

                       233rd Insured Multi-Series
                                    
                          Cross Reference Sheet

                 Pursuant to Rule 404(c) of Regulation C
                    under the Securities Act of 1933
                                    
               (Form N-8B-2 Items Required by Instruction
                     1 as to Prospectus on Form S-6)

         Form N-8B-2                               Form S-6
         Item Number                         Heading in Prospectus

                I.  Organization and General Information

1. (a)  Name of trust                 )
   (b)  Title of securities issued    ) Prospectus Part I Front Cover Page

2. Name and address of Depositor      ) Part II-The Trusts
                                      ) Part I-Summary of Essential Financial
                                      ) Information
                                      ) Part II-Fund Administration

3. Name and address of Trustee        ) Part II-The Trusts
                                      ) Part I-Summary of Essential Financial
                                      ) Information
                                      ) Part II-Trust Administration

4. Name and address of principal      ) Part I-Underwriting
     underwriter                      )

5. Organization of trust              ) Part II-The Trusts

6. Execution and termination of       ) Part II-The Trusts
     Trust Indenture and Agreement    ) Part II-Fund Administration

7. Changes of Name                    ) *

8. Fiscal year                        ) *

9. Material Litigation                ) *

    II.  General Description of the Trust and Securities of the Trust

10. General information regarding     ) Part II-The Trusts
      trust's securities and rights   ) Part II-Rights of Unitholders
      of security holders             ) Part II-Fund Administration

11. Type of securities comprising     ) Part II-The Trusts
      units                           ) Part I-Cover Page
                                      ) Part I-Portfolio

12. Certain information regarding     ) *
      periodic payment certificates   )

13. (a)  Load, fees, charges and      ) Part II-The Trust
      expenses                        ) Part I-Summary of Essential Financial
                                      ) Information
                                      ) Part II-Expenses
                                      ) Part II-Public Offering
                                      )

    (b)  Certain information regard-  ) *
           ing periodic payment plan  )
           certificates               )

    (c)  Certain percentages          ) Part I-Summary of Essential Financial
                                      ) Information
                                      ) Part II-Public Offering

    (d)  Certain other fees,          ) Par II-Rights of Unitholders
           expenses or charges        ) Part II-Expenses
           payable by holders         )

    (e)  Certain profits to be        ) Part II-Public Offering
           received by depositor,     )
           principal underwriter,     ) Part I-Notes to Portfolio
           trustee or affiliated      )
           persons                    )

    (f)  Ratio of annual charges      ) *
           to income                  )

14. Issuance of trust's securities    ) Part II-Rights of Unitholders

15. Receipt and handling of payments  ) *
      from purchasers                 )

16. Acquisition and disposition of    ) Part II-The Trusts
      underlying securities           ) Part II-Unitholder Explanations
                                      ) Part II-Fund Administration

17. Withdrawal or redemption          ) Part II-Rights of Unitholders
                                      ) Part II-Fund Administration

18. (a)  Receipt and disposition      )
      of income                       ) Part II-Rights of Unitholders

    (b)  Reinvestment of distribu-    ) Part II-Rights of Unitholders
           tions                      )

    (c)  Reserves or special funds    ) Part II-Rights of Unitholders
                                      ) Part II-Fund Administration

    (d)  Schedule of distributions    ) *

19. Records, accounts and reports     ) Part II-Rights of Unitholders
                                      ) Part II-Fund Administration

20. Certain miscellaneous provisions  ) Part II-Fund Administration
      of Trust Agreement              )

21. Loans to security holders         ) *

22. Limitations on liability          ) Part I-Portfolio
                                      ) Part II-Fund Administration

23. Bonding arrangements              ) *

24. Other material provisions of      ) *
      trust indenture or agreement    )

    III.  Organization, Personnel and Affiliated Persons of Depositor

25. Organization of Depositor         ) Part II-Fund Administration

26. Fees received by Depositor        ) Part II-Fund Administration

27. Business of Depositor             ) Part II-Fund Administration

28. Certain information as to         )
      officials and affiliated        ) *
      persons of Depositor            )

29. Companies owning securities of    ) *
      Depositor                       )

30. Controlling persons of Depositor  ) *

31. Compensation of Directors         ) *

32. Compensation of Directors         ) *

33. Compensation of Employees         ) *

34. Compensation to other persons     ) Part II-Public Offering

             IV.  Distribution and Redemption of Securities

35. Distribution of trust's           ) Part I-Cover Page
      securities by states            ) Part II-Public Offering

36. Suspension of sales of trust's    ) *
      securities                      )

37. Revocation of authority to        ) *
      distribute                      )

38. (a)  Method of distribution       )

    (b)  Underwriting agreements      ) Part II-Public Offering

    (c)  Selling agreements           )

39. (a)  Organization of principal    )
           underwriter                )
                                      ) Part II-Fund Administration
    (b)  N.A.S.D. membership by       )
           principal underwriter      )

40. Certain fees received by          ) *
      principal underwriter           )

41. (a)  Business of principal        ) Part II-Fund Administration
      underwriter                     )

    (b)  Branch offices of principal  ) *
      underwriter                     )

    (c)  Salesmen of principal        ) *
      underwriter                     )

42. Ownership of securities of the    ) *
      trust                           )

43. Certain brokerage commissions     )
      received by principal           ) *
      underwriter                     )

44. (a)  Method of valuation          )
                                      ) Part I-Summary of Essential Financial
                                      ) Information
                                      ) Part II-Rights of Unitholders
                                      ) Part II-Public Offering

    (b)  Schedule as to offering      ) *
           price                      )
 
    (c)  Variation in offering price  ) Part II-Public Offering
           to certain persons         )

45. Suspension of redemption rights   ) *

46. (a)  Redemption valuation         ) Part II-Rights of Unitholders
                                      ) Part II-Public Offering

    (b)  Schedule as to redemption    ) *
      price                           )

47. Purchase and sale of interests    ) Part II-Public Offering
      in underlying securities        ) Part II-Fund Administration

           V.  Information Concerning the Trustee or Custodian

48. Organization and regulation of    ) Part II-Fund Administration
      trustee                         )

49. Fees and expenses of trustee      ) Part I-Summary of Essential Financial
                                      ) Information
                                      ) Part II-Expenses

50. Trustee's lien                    ) Part II-Expenses

     VI.  Information Concerning Insurance of Holders of Securities

51. Insurance of holders of trust's   )
      securities                      ) *

                       VII.  Policy of Registrant

52. (a)  Provisions of trust agree-   )
           ment with respect to       )
           replacement or elimi-      ) Part II-Fund Administration
           nation of portfolio        )
           securities                 )

    (b)  Transactions involving       )
           elimination of underlying  ) *
           securities                 )

    (c)  Policy regarding substitu-   ) Part II-Fund Administration
           tion or elimination of     )
           underlying securities      )

    (d)  Fundamental policy not       ) *
           otherwise covered          )

53. Tax Status of trust               )
                                      ) Part II-Federal Tax Status

              VIII.  Financial and Statistical Information

54. Trust's securities during         ) *
      last ten years                  )

55.                                   )
                                      )

56. Certain information regarding     ) *
                                      )

57. Periodic payment certificates     )

58.                                   )

59. Financial statements (Instruc-    ) Part I-Statement of Condition
      tions 1(c) to Form S-6)         )

__________________________________
* Inapplicable, omitted, answer negative or not required

                                   VAN KAMPEN
                                PROSPECTUS PART I

   
             CALIFORNIA INSURED MUNICIPALS INCOME TRUST, SERIES 174
    

- --------------------------------------------------------------------------------

   
   California Insured Municipals Income Trust, Series 174 (the "Trust")
(included in Insured Municipals Income Trust, 233rd Insured Multi-Series (the
"Fund")) consists of interest-bearing obligations issued by or on behalf of
municipalities and other governmental authorities, the interest on which is, in
the opinion of bond counsel to the issuer, exempt from all Federal income taxes
under existing law and exempt to the extent described herein from California
state and local taxes when held by residents of California (the "Bonds"). The
objective of the Trust is Federal and California tax-exempt income and
conservation of capital through an investment in a diversified portfolio of
tax-exempt bonds. The Units of the Trust are rated "AAA" by Standard & Poor's.
The Trust is referred to herein as the "State Trust" or "Insured Trust".

    The Trust consists of 8 issues of Bonds. One of the Bonds isa general
obligation of the governmental entity issuing it or is backed by the taxing
power thereof. The remaining issues are payable from the income of a specific
project or authority and are not supported by the issuer's power to levy taxes.
These issues are divided by purpose of issues (and percentage of principal
amount) as follows: General Purpose, 2 (28%); Health Care, 1 (17%); Certificate
of Participation, 1 (16%); Industrial Revenue, 1 (12%); Tax District, 1 (12%);
General Obligation, 1 (10%) and Transportation, 1 (5%). The dollar weighted
average maturity of the Bonds is 30 years.

                                             Monthly                Semi-Annual
                                           -------------            ------------
Estimated Current Return:                     4.62%                    4.67%
Estimated Long Term Return:                   4.67%                    4.73%
CUSIP:                                     13033P-80-1              13033P-81-9
    

   Estimated Current Return shows the estimated cash to be received each year
from the Bonds (net of estimated annual expenses) divided by the Public Offering
Price (including the sales charge).

   Estimated Long-Term Return shows the estimated return over the estimated life
of the Trust. This is based on an average of the yields to maturity (or an
earlier call date) of the Bonds adjusted to reflect the sales charge and
estimated expenses. The average yield for the portfolio is derived by weighting
each Bond's yield by its value and the time remaining to the call or maturity
date, depending on how the Bond is priced. Unlike Estimated Current Return,
Estimated Long-Term Return accounts for maturities, discounts and premiums of
the Bonds.

   No return calculation can predict your actual return because returns vary
with purchase price, sales charges, the length of the time Units are held and
changes in portfolio composition, interest income and expenses. The estimated
returns are designed to show a comparison rather than a prediction of returns. A
yield calculation, which is more comparable to a calculation of an individual
bond, may be higher or lower than these estimated returns which are more
comparable to return calculations of other investment products.

   
                                  JULY 29, 1998
    

    THIS PROSPECTUS PART I MAY NOT BE DISTRIBUTED UNLESS ACCOMPANIED BY PART II.
BOTH PARTS OF THIS PROSPECTUS SHOULD BE RETAINED FOR FUTURE REFERENCE.

    THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
EXCHANGE COMMISSION NOR HAS THE COMMISSION PASSED UPON THE ACCURACY OR ADEQUACY
OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

   
<TABLE>
<CAPTION>
                   SUMMARY OF ESSENTIAL FINANCIAL INFORMATION

<S>                        <C>                <C>                                      <C>
Initial Date of Deposit:   July 29, 1998      Principal Amount of Bonds per Unit (1):  $  1,002.00
Principal Amount of Bonds: $   3,000,000      Number of Units:                               2,994
</TABLE>

- --------------------------------------------------------------------------------
PUBLIC OFFERING PRICE
- --------------------------------------------------------------------------------
Aggregate Offering Price of Bonds              $ 2,847,304
Aggregate Offering Price of Bonds per Unit     $    951.00
  Plus Sales Charge per Unit                   $     49.00
Public Offering Price per Unit (2)             $  1,000.00
Redemption Price per Unit                      $    943.68

- --------------------------------------------------------------------------------
ESTIMATED ANNUAL INCOME PER UNIT
- --------------------------------------------------------------------------------

                                                                        Semi-
                                                          Monthly      Annual
                                                        -----------  -----------
Estimated Interest Income                               $    48.55   $     48.55
  Less Estimated Expenses (4)                           $     2.35   $      1.85
  Less Estimated Insurance Expenses                     $       --   $        --
Estimated Net Interest Income                           $    46.20   $     46.70

- --------------------------------------------------------------------------------
ESTIMATED DISTRIBUTIONS
- --------------------------------------------------------------------------------
                                                   Semi-
                              Monthly             Annual
                         -----------------   -----------------
Initial Distribution     $         4.74 on   $        20.36 on
                        September 25, 1998    January 25, 1999
Normal Distribution (3)  $            3.85   $           23.35
Record Dates                   10th day of      January 10 and
                                each month             July 10
Distribution Dates             25th day of      January 25 and
                                each month             July 25

- --------------------------------------------------------------------------------
EXPENSES
- --------------------------------------------------------------------------------
                                                                        Semi-
                                                          Monthly      Annual
                                                        -----------  -----------
Sales Charge (% of Public Offering Price)                     4.90%        4.90%
Estimated Annual Expenses per Unit
  Trustee's Fee (5)                                     $      0.91  $      0.51
  Evaluator's Supervisory Fee                           $      0.25  $      0.25
  Evaluator's Evaluation Fee (5)                        $      0.30  $      0.30
  Other Operating Expenses                              $      0.89  $      0.79
                                                        -----------  -----------
Total Annual Expenses per Unit                          $      2.35  $      1.85
                                                        ===========  ===========
    

(1) Because certain of the Bonds may from time to time under certain
    circumstances be sold or redeemed or will be called or mature in accordance
    with their terms (including the call or sale of zero coupon bonds at prices
    less than par value), there is no guarantee that the value of each Unit at
    Trust termination will be equal to the Principal Amount of Bonds per Unit.
   
(2) After the First Settlement Date (August 3, 1998), Unitholders will pay
    accrued interest from such date to the settlement date less distributions
    from the Interest Account after the First Settlement Date.
    
(3) This is based on estimated cash flows per Unit which will vary with changes
    in expenses, interest rates and maturity, call, exchange or sale of the
    Bonds. Estimated cash flows are set forth in the Information Supplement or
    are available upon request.
(4) Excludes insurance expenses.
(5) This fee is assessed per $1,000 principal amount of Bonds. Other fees are
    assessed per Unit.

   
<TABLE>
<CAPTION>
PORTFOLIO
- -------------------------------------------------------------------------------------------------------------------
                                                                                                        OFFERING
                                                                                                        PRICE TO
                                                                                                        CALIFORNIA
AGGREGATE        NAME OF ISSUER, TITLE, INTEREST RATE AND                              REDEMPTION       IM-IT
PRINCIPAL        MATURITY DATE OF BONDS(1)(2)                               RATING(3)  FEATURE(4)       TRUST (2)
- ---------------  --------------------------------------------------------- ----------  --------------   -----------
<S>              <C>                                                       <C>         <C>              <C>
$      150,000   San Joaquin Hills, California, Transportation Corridor Agency,
                   Toll Road Revenue Capital Appreciation Bonds, Refunding
                   Series A (MBIA Insured)
                   #0.00% Due 01/15/2026................................      AAA                       $   36,305
       300,000   Santa Cruz, California, City High School District, General
                   Obligation Bonds, Series A (FSA Insured)                            2006 @ 102
                   5.125% Due 08/01/2027................................      AAA      2021 @ 100 S.F.     297,705
       350,000   Palm Desert, California, Palm Desert Financing Authority, Tax
                   Allocation (Housing Set-Aside) Revenue Bonds, Series 1998
                   (MBIA Insured)                                                      2008 @ 102
                   #5.10% Due 10/01/2027................................      AAA      2019 @ 100 S.F.     345,982
       500,000   Kern County, California, Board of Education, Certificate of
                   Participation, Refunding Bonds, Series A (MBIA Insured)             2008 @ 102
                   5.20% Due 05/01/2028.................................      AAA      2014 @ 100 S.F.     499,375
       350,000   Vista, California, Community Development Commission, Tax
                   Allocation Revenue Bonds, Vista Redevelopment Project
                   Area-Series A (MBIA Insured)                                        2008 @ 101
                   #5.125% Due 09/01/2028...............................      AAA      2026 @ 100 S.F.     347,322
       500,000   California Health Facilities Finance Authority, Revenue Bonds,
                   Enloe Health Systems-Series A (FSA Insured)                         2008 @ 101
                   #5.00% Due 11/15/2028................................      AAA      2019 @ 100 S.F.     485,570
       500,000   Pomona, California, Public Financing Authority, 1998 Refunding
                   Revenue Bonds (Southwest Pomona Redevelopment Project)
                   Series W (MBIA Insured)                                             2008 @ 102
                   #5.00% Due 02/01/2030................................      AAA      2025 @ 100 S.F.     484,835
       350,000   Northern California Power Agency, Public Power Revenue
                   Refunding Bonds, Hydroelectric Project No. 1-Series A
                   (MBIA Insured)                                                      2008 @ 101
                   #5.20% Due 07/01/2032................................      AAA      2029 @ 100 S.F.     350,210
- ---------------                                                                                        -----------
$    3,000,000                                                                                          $2,847,304
===============                                                                                        ===========
</TABLE>
    

- --------------------------------------------------------------------------------
All of the Bonds are insured either by one of the Preinsured Bond Insurers as
indicated in the Bond name or by a Portfolio Insurer under a portfolio insurance
policy. See "Insurance on the Bonds in the Insured Trusts" in Prospectus Part
II.

For an explanation of the footnotes used on this page, see "Notes to Portfolio".

   
NOTES TO PORTFOLIO

(1) The Bonds are represented by "regular way" or "when issued" contracts for
    the performance of which an irrevocable letter of credit, obtained from an
    affiliate of the Trustee, has been deposited with the Trustee. Contracts to
    acquire the Bonds were entered into during the period from July 24, 1998 to
    July 28, 1998.
(2) Other information regarding the Bonds is as follows:

                         COST TO           PROFIT (LOSS)
                         SPONSOR            TO SPONSOR
                     ---------------      ---------------
                     $     2,833,283      $        14,021
- -----------

    The breakdown of the Preinsured Bond Insurers is as follows: MBIA 73% and
FSA 27%.
    

    The Sponsor may have entered into contracts which hedge interest rate
    fluctuations on certain Bonds. The cost of any such contracts and the
    corresponding gain or loss is included in the Cost to Sponsor. Bonds marked
    by "##" following the maturity date have been purchased on a "when, as and
    if issued" or "delayed delivery" basis. Interest on these Bonds begins
    accruing to the benefit of Unitholders on their respective dates of
    delivery. Delivery is expected to take place at various dates after the
    First Settlement Date. "#" prior to the coupon rate indicates that the Bond
    was issued at an original issue discount. See "The Trusts--Risk Factors" in
    Prospectus Part II. The tax effect of Bonds issued at an original issue
    discount is described in "Federal Tax Status" in Prospectus Part II.

(3) All ratings are by Standard & Poor's unless otherwise indicated. "*"
    indicates that the rating of the Bond is by Moody's. "o" indicates that the
    rating is contingent upon receipt by the rating agency of a policy of
    insurance obtained by the issuer of the bonds. "N/R" indicates that the
    rating service did not provide a rating for that Bond. For a brief
    description of the ratings see "Description of Ratings" in the Information
    Supplement.

(4) This is the year in which each Bond is initially or currently callable and
    the call price for that year. Each Bond continues to be callable at
    declining prices thereafter (but not below par value) except for original
    issue discount bonds which are redeemable at prices based on the issue price
    plus the amount of original issue discount accreted to redemption date plus,
    if applicable, some premium, the amount of which will decline in subsequent
    years. "S.F." indicates a sinking fund is established with respect to an
    issue of Bonds. Certain Bonds may be subject to redemption without premium
    prior to the date shown pursuant to extraordinary optional or mandatory
    redemptions if certain events occur. See "The Trusts--Risk Factors" in
    Prospectus Part II.

   CALIFORNIA RISK FACTORS. The financial condition of the State of California
is affected by various national, economic, social and environmental policies and
conditions. Additionally, limitations imposed by constitutional amendments,
legislative measures, or votor initiatives on the State and its local
governments concerning taxes, bond indebtedness and other matters may constrain
the revenue-generating capacity of the State and its local governments and,
therefore, the ability of the issuers of the Bonds to satisfy their obligations.
The State faces a structural imbalance in its budget with the largest programs
supported by the General Fund (education, health, welfare and corrections)
growing at rates higher than the growth rates for the principal revenue sources
of the General Fund.

   The economic vitality of the State and its various regions and, therefore,
the ability of the State and its local governments to satisfy the Bonds, are
affected by numerous factors, such as natural disasters, complications with
exports and industry deregulation. The California economy continues to show
weakness in manufacturing, particularly aerospace as well as in the telephone,
communications and public utility industries. California's population increase
has resulted in traffic congestion, school overcrowding and high housing costs
which have caused an increase demand for government services and which may
impede future economic growth.

   The State is a party to numerous lawsuits in which an adverse final decision
could materially affect the State's governmental operations and consequently its
ability to pay debt service on its obligations. On December 7, 1994, Orange
County, California, together with its pooled investment fund (the "Pooled Fund")
filed for protection under Chapter 9 of the federal Bankruptcy Code. Many
governmental entities kept moneys in the Pooled Fund.
   All outstanding general obligation bonds of the State are rated "A+" by
Standard and Poor's and "A1" by Moody's.

   Further information concerning California risk factors may be obtained upon
request to the Sponsor as described in "Additional Information" appearing in
Prospectus Part II.

   
   TAX STATUS. The Internal Revenue Service Restructuring and Reform Act of 1998
(the "1998 Tax Act") provides that for taxpayers other than corporations, net
capital gain (which is defined as net long-term capital gain over net short-term
capital loss for the taxable year) realized from property (with certain
exclusions) is subject to a maximum marginal stated tax rate of 20% (10% in the
case of certain taxpayers in the lowest tax bracket). Capital gain or loss is
long-term if the holding period for the asset is more than one year, and is
short-term if the holding period for the asset is one year or less. The date on
which a Unit is acquired (i.e., the "trade date") is excluded for purposes for
determining the holding period of the Unit. The legislation is generally
effective retroactively for amounts properly taken into account on or after
January 1, 1998. Capital gains realized from assets held for one year or less
are taxed at the same rates as ordinary income. For a discussion of the Federal
tax status of income earned on California IM-IT Trust Units, see "Federal Tax
Status" in Prospectus Part II.
    

   We have examined the income tax laws of the State of California to determine
its applicability to the California IM-IT Trust and to the holders of Units in
the California IM-IT Trust who are full-time residents of the State of
California ("California Unitholders"). The assets of the California IM-IT Trust
will consist of bonds issued by the State of California or a local government of
California (the "California Bonds") or by the Commonwealth of Puerto Rico or its
authority (the "Possession Bonds") (collectively, the "Bonds"). For purposes of
the following opinions, it is assumed that each asset of the California IM-IT
Trust is debt, the interest on which is excluded from gross income for federal
income tax purposes.

   Neither the Sponsor nor its counsel have independently examined the Bonds to
be deposited in and held in the California IM-IT Trust. However, although
Chapman and Cutler expresses no opinion with respect to the issuance of the
Bonds, in rendering its opinion expressed herein, it has assumed that: (i) the
Bonds were validly issued; (ii) the interest thereon is excludable from gross
income for federal income tax purposes; and (iii) interest on the Bonds, if
received directly by a California Unitholder, would be exempt from the income
tax imposed by the State of California that is applicable to individuals, trusts
and estates (the "California Personal Income Tax"). This opinion does not
address the taxation of persons other than full time residents of California. We
have assumed that, at the respective times of issuance of the Bonds, opinions
that the Bonds were validly issued and that interest on the Bonds is excluded
from gross income for Federal income tax purposes were rendered by bond counsel
to the respective issuing authorities. In addition, we have assumed that, with
respect to the California Bonds, bond counsel to the issuing authorities
rendered opinions that the interest on the California Bonds is exempt from the
California Personal Income Tax and, with respect to the Possession Bonds, bond
counsel to the issuing authorities rendered opinions that the Possession Bonds
and the interest thereon is exempt from all state and local income taxation.
Neither the Sponsor nor its counsel has made any review for the California IM-IT
Trust of the proceedings relating to the issuance of the Bonds or of the basis
for the opinions rendered in connection therewith.

   Based upon the foregoing, and upon an investigation of such matters of law as
we considered to be applicable, we are of the opinion that, under existing
provisions of the law of the State of California as of the date hereof:

   1.    The California IM-IT Trust is not an association taxable as a
         corporation for purposes of the California Bank and Corporation Tax
         Law, and each California Unitholder will be treated as the owner of a
         pro rata portion of the California IM-IT Trust, and the income of such
         portion of the California IM-IT Trust will be treated as the income of
         the California Unitholders under the California Personal Income Tax.

   2.    Interest on the Bonds which is exempt from tax under the California
         Personal Income Tax when received by the California IM-IT Trust and
         which would be excludable from California taxable income for purposes
         of the California Personal Income Tax if received directly by a
         California Unitholder, will be excludable from California taxable
         income for purposes of the California Personal Income Tax when received
         by the California IM-IT Trust and distributed to a California
         Unitholder.

   3.    Each California Unitholder of the California IM-IT Trust will generally
         recognize gain or loss for California PersonalIncome Tax purposes if
         the Trustee disposes of a Bond (whether by redemption, sale or
         otherwise) or when the California Unitholder redeems or sells Units of
         the California IM-IT Trust, to the extent that such a transaction
         results in a recognized gain or loss to such California Unitholder for
         federal income tax purposes.  However, there are certain differences
         between the recognition of gain or loss for federal income tax purposes
         and for California Personal Income Tax purposes, and California
         Unitholders are advised to consult their own tax advisors.  Tax basis
         reduction requirements relating to amortization of bond premium may,
         under some circumstances, result in a California Unitholder realizing
         taxable gain for California Personal Income Tax purposes when a Unit is
         sold or redeemed for an amount equal to or less than its original cost.

   4.    Under the California Personal Income Tax, interest on indebtedness
         incurred or continued by a California Unitholder to purchase Units in
         the California IM-IT Trust is not deductible for purposes of the
         California Personal Income Tax.

   This opinion relates only to California Unitholders subject to the California
Personal Income Tax. No opinion is expressed with respect to the taxation of
California Unitholders subject to the California Bank and Corporation Tax Law
and such California Unitholders are advised to consult their own tax advisors.
Please note, however, that interest on the underlying Bonds attributed to a
California Unitholder that is subject to the California Bank and Corporation Tax
Law may be includible in its gross income for purposes of determining its
California franchise tax. We have not examined any of the Bonds to be deposited
and held in the California IM-IT Trust or the proceedings for the issuance
thereof or the opinions of bond counsel with respect thereto, and we express no
opinion with respect to taxation under any other provisions of the California
law. Ownership of the Units may result in collateral California tax consequences
to certain taxpayers. Prospective investors should consult their tax advisors as
to the applicability of any such collateral consequences.

   
    THE SPONSOR. Van Kampen Funds Inc. (formerly Van Kampen American Capital
Distributors, Inc.) is the Sponsor of the Trusts. The Sponsor is an indirect
subsidiary of Van Kampen Investments Inc. (formerly VK/AC Holding, Inc.). Van
Kampen Investments Inc. is a wholly-owned subsidiary of MSAM Holdings II, Inc.,
which in turn is a wholly-owned subsidiary of Morgan Stanley Dean Witter & Co.
(formerly Morgan Stanley, Dean Witter, Discover & Co.). Van Kampen Investment
Advisory Corp. (formerly Van Kampen American Capital Investment Advisory Corp.)
is the Evaluator of the Trusts and is an affiliate of the Sponsor.

   UNDERWRITING. The Underwriters named below have purchased Units in the
following amounts from the Sponsor. For additional information regarding the
Underwriters, including information relating to compensation and benefits
received by the Underwriters, see "Public Offering--Sponsor and Underwriter
Compensation" in Prospectus Part II.

<TABLE>
<CAPTION>
    NAME                                      ADDRESS                                                         UNITS
                                                                                                       -----------------
<S>                                           <C>                                                      <C>
  Van Kampen Funds Inc.                       One Parkview Plaza, Oakbrook Terrace, Illinois 60181            2,494
  A.G. Edwards & Sons, Inc.                   One North Jefferson Avenue, St. Louis, Missouri 63103             100
  Gruntal & Company, L.L.C.                   14 Wall Street, New York, New York 10005                          100
  Edward D. Jones & Co.                       201 Progress Parkway, Maryland Heights, Missouri 63043            100
  Morgan Stanley Dean Witter & Co.            2 World Trade Center, 59th Floor, New York, New York 10048        100
  Prudential Securities Inc.                  1 New York Plaza, 14th Floor, New York, New York 10292-2014       100
                                                                                                       -----------------
                                                                                                              2,994
                                                                                                       =================
</TABLE>

   LETTER OF INTENT. A purchaser desiring to purchase during a 13 month period
$500,000 or more of any combination of series of Van Kampen unit investment
trusts may qualify for a reduced sales charge by signing a nonbinding Letter of
Intent with any single broker-dealer. After signing a Letter of Intent, at the
date total purchases, less redemptions, of units of any combination of series of
Van Kampen unit investment trusts by a purchaser (including units purchased in
the name of the spouse of a purchaser or in the name of a child of such
purchaser under 21 years of age) exceed $500,000, the selling broker-dealer,
bank or other will credit the unitholder with cash as a retroactive reduction of
the sales charge on such units equal to the amount which would have been paid
for the total aggregated sale amount. If a purchaser does not complete the
required purchases under the Letter of Intent within the 13 month period, no
such retroactive sales charge reduction shall be made. To qualify under a Letter
of Intent each purchase of units of Van Kampen unit investment trusts must equal
or exceed $100,000.
    

   
                     REPORT OF CERTIFIED PUBLIC ACCOUNTANTS

    To the Board of Directors of Van Kampen Funds Inc. and the Unitholders of
California Insured Municipals Income Trust, Series 174 (included in Insured
Municipals Income Trust, 233rd Insured Multi-Series):

    We have audited the accompanying statement of condition and the portfolio of
California Insured Municipals Income Trust, Series 174 (included in Insured
Municipals Income Trust, 233rd Insured Multi-Series) as of July 29, 1998. The
statement of condition and portfolio are the responsibility of the Sponsor. Our
responsibility is to express an opinion on such financial statements based on
our audit.
    

    We conducted our audit in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. Our procedures included
confirmation of an irrevocable letter of credit deposited to purchase tax-exempt
bonds by correspondence with the Trustee. An audit also includes assessing the
accounting principles used and significant estimates made by the Sponsor, as
well as evaluating the overall financial statement presentation. We believe our
audit provides a reasonable basis for our opinion.

   
    In our opinion, the financial statements referred to above present fairly,
in all material respects, the financial position of California Insured
Municipals Income Trust, Series 174 (included in Insured Municipals Income
Trust, 233rd Insured Multi-Series) as of July 29, 1998, in conformity with
generally accepted accounting principles.

   Chicago, Illinois                                        GRANT THORNTON LLP
   July 29, 1998
    

                             STATEMENT OF CONDITION
                               AS OF JULY 29, 1998

   
         INVESTMENT IN BONDS

   Contracts to purchase Bonds (1)(2)                      $           2,847,304
   Accrued interest to the First Settlement Date (1)(2)                   36,703
                                                            --------------------
         Total                                             $           2,884,007
                                                            ====================
         LIABILITY AND INTEREST OF UNITHOLDERS
   Liability--
         Accrued interest payable to Sponsor (1)(2)        $              36,703
   Interest of Unitholders--
         Cost to investors                                             2,994,000
         Less: Gross underwriting commission                             146,696
                                                            --------------------
         Net interest to Unitholders (1)(2)                            2,847,304
                                                            --------------------
         Total                                             $           2,884,007
                                                            ====================
    

- --------------------------------------------------------------------------------
(1) The value of the Bonds is determined by Interactive Data Corporation on the
    bases set forth under "Public Offering--Offering Price" in Prospectus Part
    II. The contracts to purchase Bonds are collateralized by an irrevocable
    letter of credit in an amount sufficient to satisfy such contracts.

(2) The Trustee will advance the amount of the net interest accrued to the First
    Settlement Date to the Trust for distribution to the Sponsor as the
    Unitholder of record as of such date.

                                PROSPECTUS PART I

   
                                  JULY 29, 1998

           INSURED MUNICIPALS INCOME TRUST, 233RD INSURED MULTI-SERIES

             CALIFORNIA INSURED MUNICIPALS INCOME TRUST, SERIES 174

          ------ A Wealth of Knowledge oA Knowledge of Wealthsm ------
                                   VAN KAMPEN
    

                               One Parkview Plaza
                        Oakbrook Terrace, Illinois 60181

                             2800 Post Oak Boulevard
                              Houston, Texas 77056

  THIS PROSPECTUS PART I MAY NOT BE DISTRIBUTED UNLESS ACCOMPANIED BY PART II.
     BOTH PARTS OF THIS PROSPECTUS SHOULD BE RETAINED FOR FUTURE REFERENCE.

                                   VAN KAMPEN
                                PROSPECTUS PART I

   
              MICHIGAN INSURED MUNICIPALS INCOME TRUST, SERIES 151
    

- --------------------------------------------------------------------------------

   
   Michigan Insured Municipals Income Trust, Series 151 (the "Trust") (included
in Insured Municipals Income Trust, 233rd Insured Multi-Series (the "Fund"))
consists of interest-bearing obligations issued by or on behalf of
municipalities and other governmental authorities, the interest on which is, in
the opinion of bond counsel to the issuer, exempt from all Federal income taxes
under existing law and exempt to the extent described herein from Michigan state
and local taxes when held by residents of Michigan (the "Bonds"). The objective
of the Trust is Federal and Michigan tax-exempt income and conservation of
capital through an investment in a diversified portfolio of tax-exempt bonds.
The Units of the Trust are rated "AAA" by Standard & Poor's. The Trust is
referred to herein as the "State Trust" or "Insured Trust".

    The Trust consists of 9 issues of Bonds. Four of the Bonds are general
obligations of the governmental entities issuing them or are backed by the
taxing power thereof. The remaining issues are payable from the income of a
specific project or authority and are not supported by the issuer's power to
levy taxes. These issues are divided by purpose of issues (and percentage of
principal amount) as follows: General Obligation, 4 (36%); Health Care, 2 (33%);
Higher Education, 2 (26%) and General Purpose, 1 (5%). The dollar weighted
average maturity of the Bonds is 27 years.

                                             Monthly                Semi-Annual
                                          -------------            ------------
Estimated Current Return:                     4.60%                    4.65%
Estimated Long Term Return:                   4.67%                    4.72%
CUSIP:                                     59452Q-81-2              59452Q-82-0
    

   Estimated Current Return shows the estimated cash to be received each year
from the Bonds (net of estimated annual expenses) divided by the Public Offering
Price (including the sales charge).

   Estimated Long-Term Return shows the estimated return over the estimated life
of the Trust. This is based on an average of the yields to maturity (or an
earlier call date) of the Bonds adjusted to reflect the sales charge and
estimated expenses. The average yield for the portfolio is derived by weighting
each Bond's yield by its value and the time remaining to the call or maturity
date, depending on how the Bond is priced. Unlike Estimated Current Return,
Estimated Long-Term Return accounts for maturities, discounts and premiums of
the Bonds.

   No return calculation can predict your actual return because returns vary
with purchase price, sales charges, the length of the time Units are held and
changes in portfolio composition, interest income and expenses. The estimated
returns are designed to show a comparison rather than a prediction of returns. A
yield calculation, which is more comparable to a calculation of an individual
bond, may be higher or lower than these estimated returns which are more
comparable to return calculations of other investment products.

   
                                  JULY 29, 1998
    

    THIS PROSPECTUS PART I MAY NOT BE DISTRIBUTED UNLESS ACCOMPANIED BY PART II.
BOTH PARTS OF THIS PROSPECTUS SHOULD BE RETAINED FOR FUTURE REFERENCE.

    THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
EXCHANGE COMMISSION NOR HAS THE COMMISSION PASSED UPON THE ACCURACY OR ADEQUACY
OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

   
<TABLE>
<CAPTION>
                   SUMMARY OF ESSENTIAL FINANCIAL INFORMATION

<S>                                        <C>                <C>                                           <C>
Initial Date of Deposit:                   July 29, 1998      Principal Amount of Bonds per Unit (1):       $  1,000.98
Principal Amount of Bonds:                 $   3,055,000      Number of Units:                                    3,052
</TABLE>
- --------------------------------------------------------------------------------
PUBLIC OFFERING PRICE
- --------------------------------------------------------------------------------
Aggregate Offering Price of Bonds              $ 2,902,455
Aggregate Offering Price of Bonds per Unit     $    951.00
  Plus Sales Charge per Unit                   $     49.00
Public Offering Price per Unit (2)             $  1,000.00
Redemption Price per Unit                      $    943.68

- --------------------------------------------------------------------------------
ESTIMATED ANNUAL INCOME PER UNIT
- --------------------------------------------------------------------------------
                                                     Semi-
                                       Monthly      Annual
                                     -----------  -----------
Estimated Interest Income            $    48.33   $     48.33
  Less Estimated Expenses (4)        $     2.33   $      1.83
  Less Estimated Insurance Expenses  $       --   $        --
Estimated Net Interest Income        $    46.00   $     46.50

- --------------------------------------------------------------------------------
ESTIMATED DISTRIBUTIONS
- --------------------------------------------------------------------------------
                                                                    Semi-
                                                Monthly             Annual
                                           -----------------   -----------------
Initial Distribution                       $         4.72 on   $        20.27 on
                                          September 25, 1998    January 25, 1999
Normal Distribution (3)                    $            3.83   $           23.25
Record Dates                                     10th day of      January 10 and
                                                  each month             July 10
Distribution Dates                               25th day of      January 25 and
                                                  each month             July 25

- --------------------------------------------------------------------------------
EXPENSES
- --------------------------------------------------------------------------------
                                                                       Semi-
                                                         Monthly      Annual
                                                       -----------  -----------
Sales Charge (% of Public Offering Price)                    4.90%         4.90%
Estimated Annual Expenses per Unit
  Trustee's Fee (5)                                    $      0.91  $       0.51
  Evaluator's Supervisory Fee                          $      0.25  $       0.25
  Evaluator's Evaluation Fee (5)                       $      0.30  $       0.30
  Other Operating Expenses                             $      0.87  $       0.77
                                                       -----------  ------------
Total Annual Expenses per Unit                         $      2.33  $       1.83
                                                       ===========  ============
    

(1) Because certain of the Bonds may from time to time under certain
    circumstances be sold or redeemed or will be called or mature in accordance
    with their terms (including the call or sale of zero coupon bonds at prices
    less than par value), there is no guarantee that the value of each Unit at
    Trust termination will be equal to the Principal Amount of Bonds per Unit.
   
(2) After the First Settlement Date (August 3, 1998), Unitholders will pay
    accrued interest from such date to the settlement date less distributions
    from the Interest Account after the First Settlement Date.
    
(3) This is based on estimated cash flows per Unit which will vary with changes
    in expenses, interest rates and maturity, call, exchange or sale of the
    Bonds. Estimated cash flows are set forth in the Information Supplement or
    are available upon request.
(4) Excludes insurance expenses.
(5) This fee is assessed per $1,000 principal amount of Bonds. Other fees are
     assessed per Unit.

   
<TABLE>
<CAPTION>
PORTFOLIO
- -------------------------------------------------------------------------------------------------------------------
                                                                                                        OFFERING
                                                                                                        PRICE TO
                                                                                                        MICHIGAN
AGGREGATE        NAME OF ISSUER, TITLE, INTEREST RATE AND                              REDEMPTION       IM-IT
PRINCIPAL        MATURITY DATE OF BONDS(1)(2)                               RATING(3)  FEATURE(4)       TRUST (2)
- ---------------  --------------------------------------------------------- ----------  --------------   -----------
<S>              <C>                                                       <C>         <C>              <C>
$      150,000   Michigan Municipal Bond Authority, Local Government Loan
                   Program, Revenue Bonds, Series 1994G
                   (AMBAC Assurance Insured)
                   #0.00% Due 05/01/2020................................      AAA                        $  49,260
       555,000   Northern Michigan University, Michigan, Revenue Bonds
                   (MBIA Insured)                                                      2007 @ 102
                   #5.125% Due 12/01/2020...............................      AAA      2014 @ 100 S.F.     551,886
       250,000   Clawson, Michigan, City School District, General Obligation
                   Bonds (FSA Insured)                                                 2008 @ 100
                   #5.00% Due 05/01/2024................................      AAA      2019 @ 100 S.F.     244,178
       100,000   Lincoln Park, Michigan, School District Refunding General
                   Obligation Bonds (FGIC Insured)                                     2008 @ 100
                   #5.00% Due 05/01/2026................................      AAA      2019 @ 100 S.F.      97,571
       500,000   Rockford, Michigan, Public Schools General Obligation Bonds
                   (FGIC Insured)                                                      2007 @ 100
                   #5.25% Due 05/01/2027................................      AAA      2023 @ 100 S.F.     501,720
       500,000   Petoskey, Michigan, Hospital Finance Authority, Limited
                   Obligation Revenue Refunding Bonds (Northern Michigan
                   Hospital Obligation) MBIA Insured                                   2008 @ 102
                   #5.00% Due 11/15/2027................................      AAA      2019 @ 100 S.F.     483,145
       250,000   Clintondale, Michigan, Community Schools, Refunding General
                   Obligation Bonds (FSA Insured)                                      2008 @ 100
                   #5.125% Due 05/01/2028...............................      AAA      2019 @ 100 S.F.     248,032
       500,000   Michigan Hospital Finance Authority, Revenue and
                   Refunding Bonds (St. John Health System) Series A
                   (AMBAC Assurance Insured)                                           2008 @ 101
                   #5.00% Due 05/15/2028................................      AAA      2019 @ 100 S.F.     483,005
       250,000   Ferris State University, Michigan, Revenue Bonds (AMBAC
                   Assurance Insured)                                                  2008 @ 100
                   #5.00% Due 10/01/2028................................      AAA      2024 @ 100 S.F.     243,658
- ---------------                                                                                        -----------
$    3,055,000                                                                                          $2,902,455
===============                                                                                        ===========
</TABLE>
    

- --------------------------------------------------------------------------------
All of the Bonds are insured either by one of the Preinsured Bond Insurers as
indicated in the Bond name or by a Portfolio Insurer under a portfolio insurance
policy. See "Insurance on the Bonds in the Insured Trusts" in Prospectus Part
II.

For an explanation of the footnotes used on this page, see "Notes to Portfolio".

NOTES TO PORTFOLIO

   
(1) The Bonds are represented by "regular way" or "when issued" contracts for
    the performance of which an irrevocable letter of credit, obtained from an
    affiliate of the Trustee, has been deposited with the Trustee. Contracts to
    acquire the Bonds were entered into during the period from July 24, 1998 to
    July 28, 1998.

(2) Other information regarding the Bonds is as follows:

                          COST TO           PROFIT (LOSS)
                          SPONSOR            TO SPONSOR
                      ---------------      ---------------
                      $     2,884,845      $        17,610
- -----------

    The breakdown of the Preinsured Bond Insurers is as follows: AMBAC Assurance
    29%, Financial Guaranty 20%, MBIA 35% and FSA 16%.
    

    The Sponsor may have entered into contracts which hedge interest rate
fluctuations on certain Bonds. The cost of any such contracts and the
corresponding gain or loss is included in the Cost to Sponsor. Bonds marked by
"##" following the maturity date have been purchased on a "when, as and if
issued" or "delayed delivery" basis. Interest on these Bonds begins accruing to
the benefit of Unitholders on their respective dates of delivery. Delivery is
expected to take place at various dates after the First Settlement Date. "#"
prior to the coupon rate indicates that the Bond was issued at an original issue
discount. See "The Trusts--Risk Factors" in Prospectus Part II. The tax effect
of Bonds issued at an original issue discount is described in "Federal Tax
Status" in Prospectus Part II.

(3) All ratings are by Standard & Poor's unless otherwise indicated. "*"
    indicates that the rating of the Bond is by Moody's. "o" indicates that the
    rating is contingent upon receipt by the rating agency of a policy of
    insurance obtained by the issuer of the bonds. "N/R" indicates that the
    rating service did not provide a rating for that Bond. For a brief
    description of the ratings see "Description of Ratings" in the Information
    Supplement.
(4) This is the year in which each Bond is initially or currently callable and
    the call price for that year. Each Bond continues to be callable at
    declining prices thereafter (but not below par value) except for original
    issue discount bonds which are redeemable at prices based on the issue price
    plus the amount of original issue discount accreted to redemption date plus,
    if applicable, some premium, the amount of which will decline in subsequent
    years. "S.F." indicates a sinking fund is established with respect to an
    issue of Bonds. Certain Bonds may be subject to redemption without premium
    prior to the date shown pursuant to extraordinary optional or mandatory
    redemptions if certain events occur. See "The Trusts--Risk Factors" in
    Prospectus Part II.

   MICHIGAN RISK FACTORS. The financial condition of the State of Michigan is
affected by various national, economic, social and environmental policies and
conditions. Additionally, Constitutional and statutory limitations imposed on
the State and its local governments concerning taxes, bond indebtedness and
other matters may constrain the revenue-generating capacity of the State and its
local governments and, therefore, the ability of the issuers of the Bonds to
satisfy their obligations. The State's Constitution limits the amount of total
State revenues that may be raised from taxes and other sources. State revenues
(excluding federal aid and revenues used for payment of principal of and
interest on general obligation bonds) in any fiscal year are limited to a
specified percentage of State personal income in the prior calendar year or the
average thereof in the prior three calendar years, whichever is greater. The
State may raise taxes in excess of the limit in emergency situations.

   The economic vitality of the State and its various regions and, therefore,
the ability of the State and its local governments to satisfy the Bonds, are
affected by numerous factors. The economy of the State continues to be dependent
on manufacturing, tourism, and agriculture. These sectors tend to be cyclical
and are facing increasing competition from foreign producers.

   The State is a party to numerous lawsuits in which an adverse final decision
could materially affect the State's governmental operations and consequently its
ability to pay debt service on its obligations.

   As of March 1, 1997, all outstanding general obligation bonds of the state
were rated "Aa" by Moody's and "AA" by Fitch IBCA, Inc. (formerly Fitch
Investors Service, L.P.). In January 1998, Standard & Poor's raised its rating
on the State's general obligation bonds to "AA+". In April, 1998, Fitch IBCA,
Inc., raised its rating on the State's general obligation bonds to AA+.

   Further information concerning Michigan risk factors may be obtained upon
request to the Sponsor as described in "Additional Information" appearing in
Prospectus Part II.

   
   TAX STATUS. The Internal Revenue Service Restructuring and Reform Act of 1998
(the "1998 Tax Act") provides that for taxpayers other than corporations, net
capital gain (which is defined as net long-term capital gain over net short-term
capital loss for the taxable year) realized from property (with certain
exclusions) is subject to a maximum marginal stated tax rate of 20% (10% in the
case of certain taxpayers in the lowest tax bracket). Capital gain or loss is
long-term if the holding period for the asset is more than one year, and is
short-term if the holding period for the asset is one year or less. The date on
which a Unit is acquired (i.e., the "trade date") is excluded for purposes for
determining the holding period of the Unit. The legislation is generally
effective retroactively for amounts properly taken into account on or after
January 1, 1998. Capital gains realized from assets held for one year or less
are taxed at the same rates as ordinary income. For a discussion of the Federal
tax status of income earned on Michigan IM-IT Trust Units, see "Federal Tax
Status" in Part II of this Prospectus.
    

   In the opinion of Miller, Canfield, Paddock and Stone, P.L.C., special
counsel to the Fund for Michigan tax matters, under existing Michigan law:

   The Michigan IM-IT Trust and the owners of Units will be treated for purposes
of the Michigan income tax laws and the Single Business Tax in substantially the
same manner as they are for purposes of the Federal income tax laws, as
currently enacted. Accordingly, we have relied upon the opinion of Messrs.
Chapman and Cutler as to the applicability of Federal income tax under the
Internal Revenue Code of 1986 to the Michigan IM-IT Trust and the Unitholders.

   Under the income tax laws of the State of Michigan, the Michigan IM-IT Trust
is not an association taxable as a corporation; the income of the Michigan IM-IT
Trust will be treated as the income of the Unitholders and be deemed to have
been received by them when received by the Michigan IM-IT Trust. Interest on the
underlying Bonds which is exempt from tax under these laws when received by
Michigan IM-IT Trust will retain its status as tax exempt interest to the
Unitholders.

   For purposes of the foregoing Michigan tax laws, each Unitholder will be
considered to have received his pro rata share of Bond interest when it is
received by the Michigan IM-IT Trust, and each Unitholder will have a taxable
event when the Michigan IM-IT Trust disposes of a Bond (whether by sale,
exchange, redemption or payment at maturity) or when the Unitholder redeems or
sells his Certificate to the extent the transaction constitutes a taxable event
for Federal income tax purposes. The tax cost of each unit to a Unitholder will
be established and allocated for purposes of these Michigan tax laws in the same
manner as such cost is established and allocated for Federal income tax
purposes.

   The Michigan Intangibles Tax was totally repealed effective January 1, 1998.
   The Michigan Single Business Tax replaced the tax on corporate and financial
institution income under the Michigan Income Tax, and the Intangible Tax with
respect to those intangibles of persons subject to the Single Business Tax the
income from which would be considered in computing the Single Business Tax.
Persons are subject to the Single Business Tax only if they are engaged in
"business activity", as defined in the Act. Under the Single Business Tax, both
interest received by the Michigan IM-IT Trust on the underlying Bonds and any
amount distributed from the Michigan IM-IT Trust to a Unitholder, if not
included in determining taxable income for Federal income tax purposes, is also
not included in the adjusted tax base upon which the Single Business Tax is
computed, of either the Michigan IM-IT Trust or the Unitholders. If the Michigan
IM-IT Trust or the Unitholders have a taxable event for Federal income tax
purposes when the Michigan IM-IT Trust disposes of a Bond (whether by sale,
exchange, redemption or payment at maturity) or the Unitholder redeems or sells
his Certificate, an amount equal to any gain realized from such taxable event
which was included in the computation of taxable income for Federal income tax
purposes (plus an amount equal to any capital gain of an individual realized in
connection with such event but excluded in computing that individual's Federal
taxable income) will be included in the tax base against which, after
allocation, apportionment and other adjustments, the Single Business Tax is
computed. The tax base will be reduced by an amount equal to any capital loss
realized from such a taxable event, whether or not the capital loss was deducted
in computing Federal taxable income in the year the loss occurred. Unitholders
should consult their tax advisor as to their status under Michigan law.

   Any proceeds paid under an insurance policy issued to the Trustee of the
Trust, or paid under individual policies obtained by issuers of Bonds, which,
when received by the Unitholders, represent maturing interest on defaulted
obligations held by the Trustee, will be excludable from the Michigan income tax
laws and the Single Business Tax if, and to the same extent as, such interest
would have been so excludable if paid by the issuer of the defaulted
obligations. While treatment under the Michigan Intangibles Tax is not premised
upon the characterization of such proceeds under the Internal Revenue Code, the
Michigan Department of Treasury should adopt the same approach as under the
Michigan income tax laws and the Single Business Tax.

   As the Tax Reform Act of 1986 eliminated the capital gain deduction for tax
years beginning after December 31, 1986, the federal adjusted gross income, the
computation base for the Michigan Income Tax, of a Unitholder will be increased
accordingly to the extent such capital gains are realized when the Michigan
IM-IT Trust disposes of a Bond or when the Unitholder redeems or sells a Unit,
to the extent such transaction constitutes a taxable event for Federal income
tax purposes.

   
    THE SPONSOR. Van Kampen Funds Inc. (formerly Van Kampen American Capital
Distributors, Inc.) is the Sponsor of the Trusts. The Sponsor is an indirect
subsidiary of Van Kampen Investments Inc. (formerly VK/AC Holding, Inc.). Van
Kampen Investments Inc. is a wholly-owned subsidiary of MSAM Holdings II, Inc.,
which in turn is a wholly-owned subsidiary of Morgan Stanley Dean Witter & Co.
(formerly Morgan Stanley, Dean Witter, Discover & Co.). Van Kampen Investment
Advisory Corp. (formerly Van Kampen American Capital Investment Advisory Corp.)
is the Evaluator of the Trusts and is an affiliate of the Sponsor.

   UNDERWRITING. The Underwriters named below have purchased Units in the
following amounts from the Sponsor. For additional information regarding the
Underwriters, including information relating to compensation and benefits
received by the Underwriters, see "Public Offering--Sponsor and Underwriter
Compensation" in Prospectus Part II.

<TABLE>
<CAPTION>
    NAME                                      ADDRESS                                                         UNITS

                                                                                                       -----------------
<S>                                           <C>                                                      <C>
  Van Kampen Funds Inc.                       One Parkview Plaza, Oakbrook Terrace, Illinois 60181            1,477
  Robert W. Baird & Co. Inc.                  777 East Wisconsin Avenue, Milwaukee, Wisconsin 53202             725
  Roney & Co.                                 One Griswold, Detroit, Michigan 48226                             250
  A.G. Edwards & Sons, Inc.                   One North Jefferson Avenue, St. Louis, Missouri 63103             100
  First of Michigan Corporation               100 Renaissance Center, 26th Floor, Detroit, Michigan 48243       100
  Gruntal & Company, L.L.C.                   14 Wall Street, New York, New York 10005                          100
  Edward D. Jones & Co.                       201 Progress Parkway, Maryland Heights, Missouri 63043            100
  J.J.B. Hilliard, W.L. Lyons, Inc.           501 South Fourth Street, Louisville, Kentucky 40202               100
  Morgan Stanley Dean Witter & Co.            2 World Trade Center, 59th Floor, New York, New York 10048        100
                                                                                                       -----------------
                                                                                                              3,052
                                                                                                       =================
</TABLE>

   LETTER OF INTENT. A purchaser desiring to purchase during a 13 month period
$500,000 or more of any combination of series of Van Kampen unit investment
trusts may qualify for a reduced sales charge by signing a nonbinding Letter of
Intent with any single broker-dealer. After signing a Letter of Intent, at the
date total purchases, less redemptions, of units of any combination of series of
Van Kampen unit investment trusts by a purchaser (including units purchased in
the name of the spouse of a purchaser or in the name of a child of such
purchaser under 21 years of age) exceed $500,000, the selling broker-dealer,
bank or other will credit the unitholder with cash as a retroactive reduction of
the sales charge on such units equal to the amount which would have been paid
for the total aggregated sale amount. If a purchaser does not complete the
required purchases under the Letter of Intent within the 13 month period, no
such retroactive sales charge reduction shall be made. To qualify under a Letter
of Intent each purchase of units of Van Kampen unit investment trusts must equal
or exceed $100,000.
    

                     REPORT OF CERTIFIED PUBLIC ACCOUNTANTS

   
    To the Board of Directors of Van Kampen Funds Inc. and the Unitholders of
Michigan Insured Municipals Income Trust, Series 151 (included in Insured
Municipals Income Trust, 233rd Insured Multi-Series):

   We have audited the accompanying statement of condition and the portfolio of
Michigan Insured Municipals Income Trust, Series 151 (included in Insured
Municipals Income Trust, 233rd Insured Multi-Series) as of July 29, 1998. The
statement of condition and portfolio are the responsibility of the Sponsor. Our
responsibility is to express an opinion on such financial statements based on
our audit.
    

   We conducted our audit in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. Our procedures included
confirmation of an irrevocable letter of credit deposited to purchase tax-exempt
bonds by correspondence with the Trustee. An audit also includes assessing the
accounting principles used and significant estimates made by the Sponsor, as
well as evaluating the overall financial statement presentation. We believe our
audit provides a reasonable basis for our opinion.

   
   In our opinion, the financial statements referred to above present fairly, in
all material respects, the financial position of Michigan Insured Municipals
Income Trust, Series 151 (included in Insured Municipals Income Trust, 233rd
Insured Multi-Series) as of July 29, 1998, in conformity with generally accepted
accounting principles.

   Chicago, Illinois                                        GRANT THORNTON LLP
   July 29, 1998
    

                             STATEMENT OF CONDITION
                               AS OF JULY 29, 1998

   
         INVESTMENT IN BONDS

   Contracts to purchase Bonds (1)(2)                      $           2,902,455
   Accrued interest to the First Settlement Date (1)(2)                   33,520
                                                            --------------------
         Total                                             $           2,935,975
                                                            ====================
         LIABILITY AND INTEREST OF UNITHOLDERS
   Liability--
         Accrued interest payable to Sponsor (1)(2)        $              33,520
   Interest of Unitholders--
         Cost to investors                                             3,052,000
         Less: Gross underwriting commission                             149,545
                                                            --------------------
         Net interest to Unitholders (1)(2)                            2,902,455
                                                            --------------------
         Total                                             $           2,935,975
                                                            ====================
    

- --------------------------------------------------------------------------------
(1) The value of the Bonds is determined by Interactive Data Corporation on the
    bases set forth under "Public Offering--Offering Price" in Prospectus Part
    II. The contracts to purchase Bonds are collateralized by an irrevocable
    letter of credit in an amount sufficient to satisfy such contracts.

(2) The Trustee will advance the amount of the net interest accrued to the First
    Settlement Date to the Trust for distribution to the Sponsor as the
    Unitholder of record as of such date.

                                PROSPECTUS PART I

   
                                  JULY 29, 1998

           INSURED MUNICIPALS INCOME TRUST, 233RD INSURED MULTI-SERIES

              MICHIGAN INSURED MUNICIPALS INCOME TRUST, SERIES 151
    

   
          ------ A Wealth of Knowledge oA Knowledge of Wealthsm ------
    
                                   VAN KAMPEN

                               One Parkview Plaza
                        Oakbrook Terrace, Illinois 60181

                             2800 Post Oak Boulevard
                              Houston, Texas 77056

  THIS PROSPECTUS PART I MAY NOT BE DISTRIBUTED UNLESS ACCOMPANIED BY PART II.
     BOTH PARTS OF THIS PROSPECTUS SHOULD BE RETAINED FOR FUTURE REFERENCE.

                                   VAN KAMPEN
                                PROSPECTUS PART I

   
             NEW JERSEY INSURED MUNICIPALS INCOME TRUST, SERIES 123
    

- --------------------------------------------------------------------------------

    
  New Jersey Insured Municipals Income Trust, Series 123 (the "Trust")
(included in Insured Municipals Income Trust, 233rd Insured Multi-Series (the
"Fund")) consists of interest-bearing obligations issued by or on behalf of
municipalities and other governmental authorities, the interest on which is, in
the opinion of bond counsel to the issuer, exempt from all Federal income taxes
under existing law and exempt to the extent described herein from New Jersey
state and local taxes when held by residents of New Jersey (the "Bonds"). The
objective of the Trust is Federal and New Jersey tax-exempt income and
conservation of capital through an investment in a diversified portfolio of
tax-exempt bonds. The Units of the Trust are rated "AAA" by Standard & Poor's.
The Trust is referred to herein as the "State Trust" or "Insured Trust".

    The Trust consists of 8 issues of Bonds. None of the Bonds are general
obligations of the governmental entities issuing them or are backed by the
taxing power thereof. All of the issues are payable from the income of a
specific project or authority and are not supported by the issuer's power to
levy taxes. These issues are divided by purpose of issues (and percentage of
principal amount) as follows: General Purpose, 1 (9%); Health Care, 1 (16%);
Higher Education, 1 (16%); Water and Sewer, 2 (29%) and Certificate of
Participation, 3 (30%). The dollar weighted average maturity of the Bonds is 28
years.

                                             Monthly                Semi-Annual
                                          -------------            ------------
Estimated Current Return:                     4.59%                    4.63%
Estimated Long Term Return:                   4.60%                    4.64%
CUSIP:                                     64579L-20-9              64579L-21-7
    

   Estimated Current Return shows the estimated cash to be received each year
from the Bonds (net of estimated annual expenses) divided by the Public Offering
Price (including the sales charge).

   Estimated Long-Term Return shows the estimated return over the estimated life
of the Trust. This is based on an average of the yields to maturity (or an
earlier call date) of the Bonds adjusted to reflect the sales charge and
estimated expenses. The average yield for the portfolio is derived by weighting
each Bond's yield by its value and the time remaining to the call or maturity
date, depending on how the Bond is priced. Unlike Estimated Current Return,
Estimated Long-Term Return accounts for maturities, discounts and premiums of
the Bonds.

   No return calculation can predict your actual return because returns vary
with purchase price, sales charges, the length of the time Units are held and
changes in portfolio composition, interest income and expenses. The estimated
returns are designed to show a comparison rather than a prediction of returns. A
yield calculation, which is more comparable to a calculation of an individual
bond, may be higher or lower than these estimated returns which are more
comparable to return calculations of other investment products.

   
                                  JULY 29, 1998
    

    THIS PROSPECTUS PART I MAY NOT BE DISTRIBUTED UNLESS ACCOMPANIED BY PART II.
BOTH PARTS OF THIS PROSPECTUS SHOULD BE RETAINED FOR FUTURE REFERENCE.

    THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
EXCHANGE COMMISSION NOR HAS THE COMMISSION PASSED UPON THE ACCURACY OR ADEQUACY
OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

   
<TABLE>
<CAPTION>
                   SUMMARY OF ESSENTIAL FINANCIAL INFORMATION

<S>                                        <C>                <C>                                              <C>
Initial Date of Deposit:                   July 29, 1998      Principal Amount of Bonds per Unit (1):          $ 992.14
Principal Amount of Bonds:                   $ 3,030,000      Number of Units:                                    3,054
</TABLE>

- --------------------------------------------------------------------------------
PUBLIC OFFERING PRICE
- --------------------------------------------------------------------------------
Aggregate Offering Price of Bonds              $ 2,904,360
Aggregate Offering Price of Bonds per Unit     $    951.00
  Plus Sales Charge per Unit                   $     49.00
Public Offering Price per Unit (2)             $  1,000.00
Redemption Price per Unit                      $    943.75

- --------------------------------------------------------------------------------
ESTIMATED ANNUAL INCOME PER UNIT
- --------------------------------------------------------------------------------
                                                                        Semi-
                                                          Monthly      Annual
                                                        -----------  -----------
Estimated Interest Income                               $    48.15   $     48.15
  Less Estimated Expenses (4)                           $     2.25   $      1.83
  Less Estimated Insurance Expenses                     $       --   $        --
Estimated Net Interest Income                           $    45.90   $     46.32

- --------------------------------------------------------------------------------
ESTIMATED DISTRIBUTIONS
- --------------------------------------------------------------------------------
                                                                     Semi-
                                                Monthly             Annual
                                           -----------------   -----------------
Initial Distribution                       $         4.71 on   $        20.19 on
                                          September 25, 1998    January 25, 1999
Normal Distribution (3)                    $            3.82   $           23.16
Record Dates                                     10th day of      January 10 and
                                                  each month             July 10
Distribution Dates                               25th day of      January 25 and
                                                  each month             July 25

- --------------------------------------------------------------------------------
EXPENSES
- --------------------------------------------------------------------------------
                                                                        Semi-
                                                          Monthly      Annual
                                                        -----------  -----------
Sales Charge (% of Public Offering Price)                     4.90%        4.90%
Estimated Annual Expenses per Unit
  Trustee's Fee (5) (6)                                 $      0.91  $      0.51
  Evaluator's Supervisory Fee                           $      0.25  $      0.25
  Evaluator's Evaluation Fee (5)                        $      0.30  $      0.30
  Other Operating Expenses                              $      0.86  $      0.84
                                                        -----------  -----------
Total Annual Expenses per Unit                          $      2.32  $      1.90
                                                        ===========  ===========
    

(1) Because certain of the Bonds may from time to time under certain
    circumstances be sold or redeemed or will be called or mature in accordance
    with their terms (including the call or sale of zero coupon bonds at prices
    less than par value), there is no guarantee that the value of each Unit at
    Trust termination will be equal to the Principal Amount of Bonds per Unit.
   
(2) After the First Settlement Date (August 3, 1998), Unitholders will pay
    accrued interest from such date to the settlement date less distributions
    from the Interest Account after the First Settlement Date.
    
(3) This is based on estimated cash flows per Unit which will vary with changes
    in expenses, interest rates and maturity, call, exchange or sale of the
    Bonds. Estimated cash flows are set forth in the Information Supplement or
    are available upon request.
(4) Excludes insurance expenses.
(5) This fee is assessed per $1,000 principal amount of Bonds. Other fees are
assessed per Unit.
(6) During the first year the Trustee will reduce its fee by approximately $.07
    per Unit (which is the estimated interest to be earned prior to the expected
    delivery dates for the "when, as and if issued" Bonds). Should the interest
    exceed this amount, the Trustee will reduce its fee up to its annual fee.
    After the first year, the Trustee's fee will be the amount indicated above.
    Estimated interest income will increase to $48.22. Estimated General
    Expenses will increase to $2.32 and $1.90 under the monthly and semi-annual
    distribution plans, respectively. Estimated Net Interest Income will remain
    as shown.

   
<TABLE>
<CAPTION>
PORTFOLIO
- -------------------------------------------------------------------------------------------------------------------
                                                                                                        OFFERING
                                                                                                        PRICE TO
                                                                                                        NEW JERSEY
AGGREGATE        NAME OF ISSUER, TITLE, INTEREST RATE AND                              REDEMPTION       IM-IT
PRINCIPAL        MATURITY DATE OF BONDS(1)(2)                               RATING(3)  FEATURE(4)       TRUST (2)
- ---------------  --------------------------------------------------------- ----------  --------------   -----------
<S>              <C>                                                       <C>         <C>              <C>
$      250,000   New Jersey, University of Medicine and Dentistry, Certificate
                   of Participation Bonds, Series A (MBIA Insured)                     2008 @ 102
                   #5.00% Due 09/01/2022................................      AAA      2018 @ 100 S.F.  $  246,773
       500,000   Middlesex County, New Jersey, Certificates of Participation
                   (MBIA Insured)                                                      2008 @ 102
                   5.25% Due 06/15/2023.................................      AAA      2019 @ 100 S.F.     505,980
       500,000   Lacey Municipal Utilities Authority, New Jersey, Water Revenue
                   Refunding Bonds (MBIA Insured)                                      2007 @ 102
                   #5.20% Due 12/01/2024................................      AAA      2022 @ 100 S.F.     503,750
       500,000   New Jersey, Health Care Facilities Financing Authority, Revenue
                   Refunding Bonds-JFK Medical Center/Hartwyck (MBIA Insured)          2008 @ 101
                   #5.00% Due 07/01/2025##..............................      AAA      2019 @ 100 S.F.     488,075
       150,000   East Orange, New Jersey, Board of Education, Certificate of
                   Participation, Capital Appreciation Bonds (FSA Insured)
                   #0.00% Due 02/01/2026................................      AAA                           36,708
       370,000   Essex County, New Jersey, Improvement Authority Utility
                   System Revenue Bonds, East Orange Franchise (MBIA Insured)          2008 @ 101
                   5.00% Due 07/01/2028.................................      AAA      2019 @ 100 S.F.     363,410
       500,000   New Jersey, Educational Facilities Authority, Revenue
                   Bonds (Jersey City State College) Series E (AMBAC
                   Assurance Insured)                                                  2008 @ 100
                   #5.20% Due 07/01/2028................................      AAA      2024 @ 100 S.F.     504,625
       260,000   Port Authority of New York and New Jersey, Consolidated 111th
                   Series Revenue Bonds (MBIA Insured)                                 2007 @ 101
                   #5.00% Due 10/01/2032................................      AAA      2028 @ 100 S.F.     255,039
- ---------------                                                                                        ------------
$    3,030,000                                                                                         $ 2,904,360
===============                                                                                        ============
</TABLE>
    

- --------------------------------------------------------------------------------
All of the Bonds are insured either by one of the Preinsured Bond Insurers as
indicated in the Bond name or by a Portfolio Insurer under a portfolio insurance
policy. See "Insurance on the Bonds in the Insured Trusts" in Prospectus Part
II.

For an explanation of the footnotes used on this page, see "Notes to Portfolio".

NOTES TO PORTFOLIO

   
(1) The Bonds are represented by "regular way" or "when issued" contracts for
    the performance of which an irrevocable letter of credit, obtained from an
    affiliate of the Trustee, has been deposited with the Trustee. Contracts to
    acquire the Bonds were entered into during the period from July 24, 1998 to
    July 28, 1998.
(2) Other information regarding the Bonds is as follows:

                             COST TO           PROFIT (LOSS)
                             SPONSOR            TO SPONSOR
                        ---------------      ---------------
                        $     2,883,781      $        20,579
- -----------

    The breakdown of the Preinsured Bond Insurers is as follows: AMBAC Assurance
16%, MBIA 79% and FSA 5%.
    

    The Sponsor may have entered into contracts which hedge interest rate
    fluctuations on certain Bonds. The cost of any such contracts and the
    corresponding gain or loss is included in the Cost to Sponsor. Bonds marked
    by "##" following the maturity date have been purchased on a "when, as and
    if issued" or "delayed delivery" basis. Interest on these Bonds begins
    accruing to the benefit of Unitholders on their respective dates of
    delivery. Delivery is expected to take place at various dates after the
    First Settlement Date. "#" prior to the coupon rate indicates that the Bond
    was issued at an original issue discount. See "The Trusts--Risk Factors" in
    Prospectus Part II. The tax effect of Bonds issued at an original issue
    discount is described in "Federal Tax Status" in Prospectus Part II.
(3) All ratings are by Standard & Poor's unless otherwise indicated. "*"
    indicates that the rating of the Bond is by Moody's. "o" indicates that the
    rating is contingent upon receipt by the rating agency of a policy of
    insurance obtained by the issuer of the bonds. "N/R" indicates that the
    rating service did not provide a rating for that Bond. For a brief
    description of the ratings see "Description of Ratings" in the Information
    Supplement.
(4) This is the year in which each Bond is initially or currently callable and
    the call price for that year. Each Bond continues to be callable at
    declining prices thereafter (but not below par value) except for original
    issue discount bonds which are redeemable at prices based on the issue price
    plus the amount of original issue discount accreted to redemption date plus,
    if applicable, some premium, the amount of which will decline in subsequent
    years. "S.F." indicates a sinking fund is established with respect to an
    issue of Bonds. Certain Bonds may be subject to redemption without premium
    prior to the date shown pursuant to extraordinary optional or mandatory
    redemptions if certain events occur. See "The Trusts--Risk Factors" in
    Prospectus Part II.

   NEW JERSEY RISK FACTORS. The financial condition of the State of New Jersey
is affected by various national, economic, social and environmental policies and
conditions. Additionally, Constitutional and statutory limitations imposed on
the State and its local governments concerning taxes, bond indebtedness and
other matters may constrain the revenue-generating capacity of the State and its
local governments and, therefore, the ability of the issuers of the Bonds to
satisfy their obligations.

   The economic vitality of the State and its various regions and, therefore,
the ability of the State and its local governments to satisfy the Bonds, are
affected by numerous factors. The State's economic base is diversified,
consisting of manufacturing, construction and service industries, supplemented
by rural areas with selective commercial agriculture. The State has a relatively
high wage labor market which has resulted in the State's business sector
becoming more vulnerable to competitive pressures.

   The State is a party to numerous lawsuits in which an adverse final decision
could materially affect the State's governmental operations and consequently its
ability to pay debt service on its obligations.

   All outstanding general obligation bonds to the State are rated "AA+" by
Standard and Poor's and "Aa1" by Moody's.

   Further information concerning New Jersey risk factors may be obtained upon
request to the Sponsor as described in "Additional Information" appearing in
Prospectus Part II.

   
   TAX STATUS. The Internal Revenue Service Restructuring and Reform Act of 1998
(the "1998 Tax Act") provides that for taxpayers other than corporations, net
capital gain (which is defined as net long-term capital gain over net short-term
capital loss for the taxable year) realized from property (with certain
exclusions) is subject to a maximum marginal stated tax rate of 20% (10% in the
case of certain taxpayers in the lowest tax bracket). Capital gain or loss is
long-term if the holding period for the asset is more than one year, and is
short-term if the holding period for the asset is one year or less. The date on
which a Unit is acquired (i.e., the "trade date") is excluded for purposes for
determining the holding period of the Unit. The legislation is generally
effective retroactively for amounts properly taken into account on or after
January 1, 1998. Capital gains realized from assets held for one year or less
are taxed at the same rates as ordinary income. For a discussion of the Federal
tax status of income earned on New Jersey IM-IT Trust Units, see "Federal Tax
Status" in Prospectus Part II.
    

    In the opinion of Pitney, Hardin, Kipp & Szuch, special counsel to the Fund
for New Jersey tax matters, under existing law:

   (1) The New Jersey IM-IT Trust will be recognized as a trust and not an
association taxable as a corporation.  The New Jersey IM-IT Trust will not be
subject to the New Jersey Corporation Business Tax or the New Jersey Corporation
Income Tax.

   (2) With respect to the non-corporate Unitholders who are residents of New
Jersey, the income of the New Jersey IM-IT Trust which is allocable to each such
Unitholder will be treated as the income of such Unitholder under the New Jersey
Gross Income Tax. Interest on the underlying Bonds which would be exempt from
New Jersey Gross Income Tax if directly received by such Unitholder will retain
its status as tax-exempt interest when received by the New Jersey IM-IT Trust
and distributed to such Unitholder. Any proceeds paid under the insurance policy
issued to the Trustee of the New Jersey IM-IT Trust with respect to the Bonds or
under individual policies obtained by issuers of Bonds which represent maturing
interest on defaulted obligations held by the Trustee will be exempt from New
Jersey Gross Income Tax if, and to the same extent as, such interest would have
been so exempt if paid by the issuer of the defaulted obligations.

   (3) A non-corporate Unitholder will not be subject to the New Jersey Gross
Income Tax on any gain realized either when the New Jersey IM-IT Trust disposes
of a Bond (whether by sale, exchange, redemption, or payment at maturity), when
the Unitholder redeems or sells his Units or upon payment of any proceeds under
the insurance policy issued to the Trustee of the New Jersey IM-IT Trust with
respect to the Bonds or under individual policies obtained by issuers of Bonds
which represent maturing principal on defaulted obligations held by the Trustee.
Any loss realized on such disposition may not be utilized to offset gains
realized by such Unitholder on the disposition of assets the gain on which is
subject to the New Jersey Gross Income Tax.

   (4) Units of the New Jersey IM-IT Trust may be taxable on the death of a
Unitholder under the New Jersey Transfer Inheritance Tax Law or the New Jersey
Estate Tax Law.

   (5) If a Unitholder is a corporation subject to the New Jersey Corporation
Business Tax or New Jersey Corporation Income Tax, interest from the Bonds in
the New Jersey IM-IT Trust which is allocable to such corporation will be
includable in its entire net income for purposes of the New Jersey Corporation
Business Tax or New Jersey Corporation Income Tax, less any interest expense
incurred to carry such investment to the extent such interest expense has not
been deducted in computing Federal taxable income. Net gains derived by such
corporation on the disposition of the Bonds by the New Jersey IM-IT Trust or on
the disposition of its Units will be included in its entire net income for
purposes of the New Jersey Corporation Business Tax or New Jersey Corporation
Income Tax. Any proceeds paid under the insurance policy issued to the Trustee
of the New Jersey IM-IT Trust with respect to the Bonds or under individual
policies obtained by issuers of Bonds which represent maturing interest or
maturing principal on defaulted obligations held by the Trustee will be included
in its entire net income for purposes of the New Jersey Corporation Business Tax
or New Jersey Corporation Income Tax if, and to the same extent as, such
interest or proceeds would have been so included if paid by the issuer of the
defaulted obligations.

   
    THE SPONSOR. Van Kampen Funds Inc. (formerly Van Kampen American Capital
Distributors, Inc.) is the Sponsor of the Trusts. The Sponsor is an indirect
subsidiary of Van Kampen Investments Inc. (formerly VK/AC Holding, Inc.). Van
Kampen Investments Inc. is a wholly-owned subsidiary of MSAM Holdings II, Inc.,
which in turn is a wholly-owned subsidiary of Morgan Stanley Dean Witter & Co.
(formerly Morgan Stanley, Dean Witter, Discover & Co.). Van Kampen Investment
Advisory Corp. (formerly Van Kampen American Capital Investment Advisory Corp.)
is the Evaluator of the Trusts and is an affiliate of the Sponsor.

   UNDERWRITING. The Underwriters named below have purchased Units in the
following amounts from the Sponsor. For additional information regarding the
Underwriters, including information relating to compensation and benefits
received by the Underwriters, see "Public Offering--Sponsor and Underwriter
Compensation" in Prospectus Part II.

<TABLE>
<CAPTION>

    NAME                                      ADDRESS                                                         UNITS
                                                                                                       -----------------
<S>                                           <C>                                                      <C>
  Van Kampen Funds Inc.                       One Parkview Plaza, Oakbrook Terrace, Illinois 60181            2,754
  Gruntal & Company, L.L.C.                   14 Wall Street, New York, New York 10005                          100
  Morgan Stanley Dean Witter & Co.            2 World Trade Center, 59th Floor, New York, New York 10048        100
  Prudential Securities Inc.                  1 New York Plaza, 14th Floor, New York, New York 10292-2014       100
                                                                                                       -----------------
                                                                                                              3,054
                                                                                                       =================
</TABLE>

   LETTER OF INTENT. A purchaser desiring to purchase during a 13 month period
$500,000 or more of any combination of series of Van Kampen unit investment
trusts may qualify for a reduced sales charge by signing a nonbinding Letter of
Intent with any single broker-dealer. After signing a Letter of Intent, at the
date total purchases, less redemptions, of units of any combination of series of
Van Kampen unit investment trusts by a purchaser (including units purchased in
the name of the spouse of a purchaser or in the name of a child of such
purchaser under 21 years of age) exceed $500,000, the selling broker-dealer,
bank or other will credit the unitholder with cash as a retroactive reduction of
the sales charge on such units equal to the amount which would have been paid
for the total aggregated sale amount. If a purchaser does not complete the
required purchases under the Letter of Intent within the 13 month period, no
such retroactive sales charge reduction shall be made. To qualify under a Letter
of Intent each purchase of units of Van Kampen unit investment trusts must equal
or exceed $100,000.
    

                     REPORT OF CERTIFIED PUBLIC ACCOUNTANTS

   
    To the Board of Directors of Van Kampen Funds Inc. and the Unitholders of
New Jersey Insured Municipals Income Trust, Series 123 (included in Insured
Municipals Income Trust, 233rd Insured Multi-Series):
    

   We have audited the accompanying statement of condition and the portfolio of
New Jersey Insured Municipals Income Trust, Series 123 (included in Insured
Municipals Income Trust, 233rd Insured Multi-Series) as of July 29, 1998. The
statement of condition and portfolio are the responsibility of the Sponsor. Our
responsibility is to express an opinion on such financial statements based on
our audit.

   We conducted our audit in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. Our procedures included
confirmation of an irrevocable letter of credit deposited to purchase tax-exempt
bonds by correspondence with the Trustee. An audit also includes assessing the
accounting principles used and significant estimates made by the Sponsor, as
well as evaluating the overall financial statement presentation. We believe our
audit provides a reasonable basis for our opinion.

   
   In our opinion, the financial statements referred to above present fairly, in
all material respects, the financial position of New Jersey Insured Municipals
Income Trust, Series 123 (included in Insured Municipals Income Trust, 233rd
Insured Multi-Series) as of July 29, 1998, in conformity with generally accepted
accounting principles.

   Chicago, Illinois                                        GRANT THORNTON LLP
   July 29, 1998
    

                             STATEMENT OF CONDITION
                               AS OF JULY 29, 1998

   
         INVESTMENT IN BONDS

   Contracts to purchase Bonds (1)(2)                      $           2,904,360
   Accrued interest to the First Settlement Date (1)(2)                   28,172
                                                            --------------------
         Total                                             $           2,932,532
                                                            ====================
         LIABILITY AND INTEREST OF UNITHOLDERS
   Liability--
         Accrued interest payable to Sponsor (1)(2)        $              28,172
   Interest of Unitholders--
         Cost to investors                                             3,054,000
         Less: Gross underwriting commission                             149,640
                                                            --------------------
         Net interest to Unitholders (1)(2)                            2,904,360
                                                            --------------------
         Total                                             $           2,932,532
                                                            ====================
    

- --------------------------------------------------------------------------------
(1) The value of the Bonds is determined by Interactive Data Corporation on the
    bases set forth under "Public Offering--Offering Price" in Prospectus Part
    II. The contracts to purchase Bonds are collateralized by an irrevocable
    letter of credit in an amount sufficient to satisfy such contracts.

(2) The Trustee will advance the amount of the net interest accrued to the First
    Settlement Date to the Trust for distribution to the Sponsor as the
    Unitholder of record as of such date.

                                PROSPECTUS PART I

   
                                  JULY 29, 1998

           INSURED MUNICIPALS INCOME TRUST, 233RD INSURED MULTI-SERIES

             NEW JERSEY INSURED MUNICIPALS INCOME TRUST, SERIES 123

          ------ A Wealth of Knowledge oA Knowledge of Wealthsm ------
                                   VAN KAMPEN
    

                               One Parkview Plaza
                        Oakbrook Terrace, Illinois 60181

                             2800 Post Oak Boulevard
                              Houston, Texas 77056

  THIS PROSPECTUS PART I MAY NOT BE DISTRIBUTED UNLESS ACCOMPANIED BY PART II.
     BOTH PARTS OF THIS PROSPECTUS SHOULD BE RETAINED FOR FUTURE REFERENCE.

February 1998

                           VAN KAMPEN AMERICAN CAPITAL
                               PROSPECTUS PART II

INSURED MUNICIPALS INCOME TRUST, INSURED MULTI-SERIES AND
INSURED MUNICIPALS INCOME TRUST AND INVESTORS' QUALITY TAX-EXEMPT TRUST,
  MULTI-SERIES
- --------------------------------------------------------------------------------

   THE FUND. The objectives of the Fund are Federal and, in the case of a State
Trust, state tax-exempt income and conservation of capital through an investment
in a diversified portfolio of tax-exempt bonds. The Fund consists of the
underlying separate unit investment trusts set forth in Prospectus Part I. The
Bonds are interest-bearing obligations issued by or on behalf of municipalities
and other governmental authorities, the interest on which is exempt from all
Federal income taxes under existing law in the opinion of bond counsel to the
issuer. In addition, the interest income of each State Trust is, in the opinion
of bond counsel to the issuer, exempt to the extent indicated from state and
local taxes, when held by residents of the state where the issuers of the Bonds
are located. Except in specific instances as noted in Prospectus Part I, the
information contained in this Prospectus Part II shall apply to each Trust in
its entirety.

   "AAA" RATING FOR THE INSURED TRUSTS. Insurance guaranteeing the payments of
principal and interest, when due, on the Bonds in each Insured Trust has been
obtained from a municipal bond insurance company. See "Insurance on the Bonds in
the Insured Trusts". Insurance relates only to the Bonds and not to the Units or
to the market value thereof. As a result of such insurance, the Units of each
Insured Trust have received a rating of "AAA" by Standard & Poor's, A Division
of the McGraw-Hill Companies ("Standard & Poor's"). Units of the Trusts are not
insured by the FDIC, are not deposits or other obligations of, or guaranteed by,
any government agency and are subject to investment risk, including possible
loss of the principal amount invested.

   PUBLIC OFFERING PRICE. The Public Offering Price of Units during the initial
offering period includes the aggregate offering price of the Bonds, the
applicable sales charge, cash, if any, in the Principal Account of the Trust,
and accrued interest, if any. Sales charges for the Trusts are set forth under
"Public Offering--General." During the initial offering period, the sales charge
is reduced for sales involving at least 100 Units.

   ESTIMATED CURRENT AND LONG-TERM RETURNS. The Estimated Current Returns and
Estimated Long-Term Returns to Unitholders are described on the cover of 
Prospectus Part I. See "Estimated Current and Long-Term Returns."

   DISTRIBUTION OPTIONS. Unitholders may elect to receive distributions on a
monthly or semi-annual basis. See "Rights of Unitholders--Distributions of
Interest and Principal". Those indicating no choice will be deemed to have
chosen the monthly distribution plan.

   MARKET FOR UNITS. Although not obligated to do so, the Sponsor intends to,
and certain of the other Underwriters may, maintain a secondary market for the
Units. If a secondary market is not available, a Unitholder will always be able
to redeem his Units through the Trustee on any business day. See "Rights of
Unitholders--Redemption of Units" and "Public Offering--Market for Units".

   REINVESTMENT OPTION. Unitholders may reinvest their distributions into Van
Kampen American Capital or Morgan Stanley mutual funds. See "Rights of
Unitholders--Reinvestment Option". Unitholders may also have the option of
exchanging their investment for units of other Van Kampen American Capital unit
investment trusts at a reduced sales charge. Unitholders may obtain a prospectus
for such trusts from the Sponsor.

   RISK FACTORS. An investment in Units should be made with an understanding of
certain risks, including, among other factors, the inability of the issuer or an
insurer, if any, to pay the principal of or interest on a bond when due,
volatile interest rates, early call provisions, and changes to the tax status of
the Bonds. See "The Trusts--Risk Factors".

THIS PROSPECTUS PART II MAY NOT BE DISTRIBUTED UNLESS ACCOMPANIED BY PART I.
BOTH PARTS OF THIS PROSPECTUS SHOULD BE RETAINED FOR FUTURE REFERENCE.

   An Information Supplement has been filed with the Securities and Exchange
Commission ("SEC") and can be obtained without charge by calling (800) 856-8487
 or is available along with other related materials at the SEC's Internet site
   (http://www.sec.gov). This Prospectus incorporates by reference the entire
                            Information Supplement.

- --------------------------------------------------------------------------------
THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
EXCHANGE COMMISSION NOR HAS THE COMMISSION PASSED UPON THE ACCURACY OR ADEQUACY
OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
<PAGE>
THE TRUSTS
- --------------------------------------------------------------------------------

    THE FUND. This series of the Insured Municipals Income Trust or the Insured
Municipals Income Trust and Investors' Quality Tax-Exempt Trust (the "Fund"),
consists of the underlying separate unit investment trusts described in
Prospectus Part I. The Fund was created under the laws of the State of New York
pursuant to a Trust Indenture and Agreement (the "Trust Agreement"), dated the
date of Prospectus Part I (the "Date of Deposit") among Van Kampen American
Capital Distributors, Inc., as Sponsor, American Portfolio Evaluation Services,
a division of Van Kampen American Capital Investment Advisory Corp., as
Evaluator, and The Bank of New York, as Trustee.

    The Fund consists of separate portfolios of interest-bearing obligations
issued by or on behalf of states and territories of the United States, and
political subdivisions and authorities thereof, the interest on which is, in the
opinion of recognized bond counsel to the issuing authorities, excludable from
gross income for Federal income tax purposes under existing law. All issuers of
Bonds in a State Trust are located in the state for which the Trust is named or
in United States territories or possessions and their public authorities;
consequently, in the opinion of recognized bond counsel to the Bond issuers, the
interest earned on the Bonds is exempt to the extent indicated in Prospectus
Part I from state and local taxes. Further, in the opinion of bond counsel to
the respective issuers, the interest income of each Bond in a U.S. Territorial
IM-IT Trust is exempt from state, Commonwealth of Puerto Rico and local income
taxation. With the exception of New York and Pennsylvania Trusts, Units of a
State Trust may be purchased only by residents of the state for which the Trust
is named. Units of a New York Trust may be purchased by residents of New York,
Connecticut and Florida. Units of a Pennsylvania Trust may be purchased by
residents of Pennsylvania, Connecticut, Florida, Maryland, New York, Ohio and
West Virginia. State Trusts, other than State Intermediate Laddered Maturity
Trusts or State Intermediate Trusts, are referred to herein as "Long-Term State
Trusts".

    On the Date of Deposit, the Sponsor deposited with the Trustee the aggregate
principal amount of Bonds indicated in the "Summary of Essential Financial
Information" in Prospectus Part I. The Bonds initially consist of delivery
statements relating to contracts for their purchase and cash, cash equivalents
and/or irrevocable letters of credit issued by a financial institution.
Thereafter, the Trustee, in exchange for the Bonds, delivered to the Sponsor
evidence of ownership of the number of Units indicated under "Summary of
Essential Financial Information" in Prospectus Part I.

    The portfolio of any IM-IT, IM-IT Discount, U.S. Territorial IM-IT,
Long-Term State or National Quality Trust consists of Bonds maturing
approximately 15 to 40 years from the Date of Deposit. The approximate range of
maturities from the Date of Deposit for Bonds in any IM-IT Limited Maturity
Trust, IM-IT Intermediate Trust, State Intermediate Laddered Maturity Trust and
IM-IT Short Intermediate Trust is 12 to 15 years, 5 to 15 years, 5 to 10 years
and 3 to 7 years, respectively. The portfolio of any State Intermediate Laddered
Maturity Trust is structured so that approximately 20% of the Bonds will mature
each year, beginning in approximately the fifth year of the Trust, entitling
each Unitholder to a return of principal. This return of principal may offer
Unitholders the opportunity to respond to changing economic conditions and to
specific financial needs that may arise between the fifth and tenth years of the
Trust. However, the flexibility provided by the return of principal may also
eliminate a Unitholder's ability to reinvest at a rate as high as the yield on
the Bonds which matured.

    Each Unit initially offered represents a fractional undivided interest in
the principal and net income of a Trust. To the extent that any Units are
redeemed by the Trustee, the fractional undivided interest in a Trust
represented by each Unit will increase, although the actual interest in the
Trust will remain unchanged. Units will remain outstanding until redeemed by
Unitholders or until the termination of the Trust Agreement.

    OBJECTIVES AND BOND SELECTION. The objectives of the Fund are income exempt
from Federal income taxation and, in the case of a State Trust, Federal and
state income taxation and conservation of capital through an investment in
diversified portfolios of Federal and state tax-exempt obligations. A State
Intermediate Laddered Maturity Trust has additional objectives of providing
protection against changes in interest rates and investment flexibility through
an investment in a laddered portfolio of intermediate-term interest-bearing
obligations with maturities ranging from approximately 5 to 10 years in which
roughly 20% of the Bonds mature each year beginning in approximately the fifth
year of the Trust. There is, of course, no guarantee that the Trusts will
achieve their objectives. The Fund may be an appropriate investment vehicle for
investors who desire to participate in a portfolio of tax-exempt fixed income
bonds with greater diversification than they might be able to acquire
individually. Insurance guaranteeing the timely payment, when due, of all
principal and interest on the Bonds in each Insured Trust has been obtained from
a municipal bond insurance company. For information relating to insurance on the
Bonds, see "Insurance on the Bonds in the Insured Trusts". In addition, these
bonds are often not available in small amounts.

    In selecting Bonds for the Trusts, the Sponsor considered the following
factors, among others: (a) either the Standard & Poor's rating of the Bonds was
not less than "BBB-" for Insured Trusts and "A-" for Quality Trusts, or the
Moody's Investors Service, Inc. ("Moody's") rating of the Bonds was not less
than "Baa" for Insured Trusts and "A" for the Quality Trusts, including
provisional or conditional ratings, respectively, (or, if not rated, the Bonds
had credit characteristics sufficiently similar to the credit characteristics of
interest-bearing tax-exempt bonds that were so rated as to be acceptable for
acquisition by the Fund in the opinion of the Sponsor), (b) the prices of the
Bonds relative to other bonds of comparable quality and maturity, (c) the
diversification of Bonds as to purpose of issue and location of issuer and (d)
with respect to the Insured Trusts, the availability and cost of insurance.
After the Date of Deposit, a Bond may cease to be rated or its rating may be
reduced below the minimum required as of the Date of Deposit. Neither event
requires elimination of a Bond from a Trust but may be considered in the
Sponsor's determination as to whether or not to direct the Trustee to dispose of
the Bond (see "Fund Administration--Portfolio Administration").

    RISK FACTORS. The Trusts include certain types of bonds as described on the
cover of Prospectus Part I. An investment in Units should be made with an
understanding of the characteristics of and risks associated with such bonds.
The following is a brief summary of certain of these risks. Additional
information is included in Prospectus Part I and in the Information Supplement.
See "Additional Information". Neither the Sponsor nor the Trustee are liable for
any default, failure or defect in any of the Bonds.

    Certain of the Bonds may be general obligations of a governmental entity
that are backed by the taxing power of the entity. All other Bonds are revenue
bonds payable from the income of a specific project or authority and are not
supported by the issuer's power to levy taxes. General obligation bonds are
secured by the issuer's pledge of its faith, credit and taxing power for the
payment of principal and interest. Revenue bonds, on the other hand, are payable
only from the revenues derived from a particular facility or class of facilities
or, in some cases, from the proceeds of a special excise tax or other specific
revenue source. There are, of course, variations in the security of the
different Bonds, both within a particular classification and between
classifications, depending on numerous factors.

    Mortgage loan obligations may be FHA insured or may be single family
mortgage revenue bonds issued for the purpose of acquiring from originating
financial institutions notes secured by mortgages on residences located within
the issuer's boundaries and owned by persons of low or moderate income. Mortgage
loans are generally partially or completely prepaid prior to their final
maturities as a result of events such as sale of the mortgaged premises,
default, condemnation or casualty loss. A substantial portion of these bonds
will probably be redeemed prior to their scheduled maturities or even prior to
their ordinary call dates. Additionally, unusually high rates of default on the
underlying mortgage loans may reduce revenues available for the payment of
principal of or interest on mortgage revenue bonds.

    Health care revenue bonds have ratings issued for health care facilities
that are often based on feasibility studies that contain projections of
occupancy levels, revenues and expenses. A facility's gross receipts and net
income available for debt service may be affected by future events and
conditions including, among other things, demand for services and the ability of
the facility to provide the services required, competition with other health
care facilities, efforts by insurers and governmental agencies to limit rates
and legislation establishing state rate-setting agencies.

    Public utility bond issuers sell wholesale and retail electric power and
gas. General problems of these issuers include difficulty in financing large
construction programs in an inflationary period, costs and delays attributable
to environmental considerations, the difficulty of the capital market in
absorbing utility debt, difficulty in obtaining fuel at reasonable prices, the
effect of energy conservation and government regulations.

    Water and/or sewerage revenue bonds are generally payable from user fees.
The problems of these issuers include the ability to obtain rate increases,
population decline resulting in decreased user fees, financing, environmental
considerations, discovering fresh water and the impact of "no-growth" zoning
ordinances.

    Industrial revenue bonds ("IRBs") have generally been issued under bond
resolutions under which the revenues and receipts payable have been assigned and
pledged to purchasers. In some cases, a mortgage on the underlying project may
have been granted as security for the IRBs. Regardless of the structure, payment
of IRBs is solely dependent upon the creditworthiness of the corporate operator
of the project or corporate guarantor which may be affected by such things as
cyclicality of revenues and earnings, regulatory and environmental restrictions,
litigation resulting from accidents, extensive competition and financial
deterioration resulting from a corporate restructuring.

    Lease bonds are secured by lease payments of a governmental entity and are
often in the form of certificates of participation. Although the lease bonds do
not constitute general obligations of the municipality for which the
municipality's taxing power is pledged, a lease bond is ordinarily backed by the
municipality's covenant to appropriate for and make the payments due under the
lease bond. However, certain lease bonds contain "non-appropriation" clauses
which provide that the municipality has no obligation to make lease payments in
future years unless money is appropriated for such purpose on a yearly basis. A
governmental entity that enters into such a lease agreement cannot obligate
future governments to appropriate for and make lease payments but covenants to
take such action as is necessary to include any lease payments due in its
budgets and to make the appropriations therefor. A governmental entity's failure
to appropriate for and to make payments under its lease bond could result in
insufficient funds available for payment of the bonds secured thereby. Although
"non-appropriation" lease bonds are secured by the leased property, disposition
of the property in the event of foreclosure might prove difficult.

    Education bond issuers govern the operation of schools, colleges and
universities and revenues are derived mainly from ad valorem taxes or from
tuition, dormitory revenues, grants and endowments. General problems relating to
school bonds include litigation contesting the financing of public education, a
declining percentage of the population consisting of "college" age individuals,
inability to raise tuitions and fees sufficiently and government legislation or
regulations which may adversely affect the revenues or costs of the issuers.

    Transportation bonds are payable from revenues derived from the ownership
and operation of facilities such as airports, bridges, turnpikes, port
authorities, convention centers and arenas. Airport operating income may be
affected by the ability of the airlines to meet their obligations under use
agreements. Payment on bonds related to other facilities may be adversely
affected by reduction in revenues due to such factors as increased cost of
maintenance, decreased use of a facility, lower cost of alternative modes of
transportation, scarcity of fuel and reduction or loss of rents.

    Certain Bonds are payable from revenues derived from the operation of
resource recovery facilities which are designed to process solid waste, generate
steam and convert steam to electricity. Resource recovery bonds may be subject
to extraordinary optional redemption at par upon the occurrence of circumstances
such as destruction or condemnation of a project, void or unenforceable
contracts, changes in the economic availability of raw materials, and operating
supplies or facilities, or other unavoidable changes adversely affecting the
operation of a project.

    Certain Bonds may have been acquired at a market discount from par value at
maturity. The interest rates on these bonds are lower than current market
interest rates for newly issued bonds of comparable rating and type. Generally,
if interest rates for newly issued comparable bonds increase, the market
discount of previously issued bonds will increase, and if interest rates for
newly issued comparable bonds decline, the market discount of previously issued
bonds will decrease. The value of bonds purchased at a market discount will
generally increase in value faster than bonds purchased at a market premium if
interest rates decrease. Conversely, if interest rates increase, the value of
bonds purchased at a market discount will generally decrease faster than bonds
purchased at a market premium. In addition, if interest rates rise, the
prepayment risk of higher yielding, premium bonds and the prepayment benefit for
lower yielding, discount bonds will be reduced. A bond purchased at a market
discount and held to maturity will have a larger portion of its total return in
the form of taxable income and capital gain and less in the form of tax-exempt
interest income than a comparable bond newly issued at current market rates. See
"Federal Tax Status." Market discount attributable to interest changes does not
indicate a lack of market confidence in the issue.

    Certain Bonds may be "original issue discount" bonds which were issued
with interest rates less than rates offered by comparable bonds and were
originally sold at a discount from their par value. These bonds may include
"zero coupon" bonds which are described below. In a stable interest rate
envronment, the market value of an original issue discount bond would tend to
increase more slowly in the early years and in greater increments as the bond
approached maturity. These bonds may be subject to redemption at prices based on
the issue price plus the amount of original issue discount accreted to
redemption plus some premium, if applicable. Under these call provisions, these
bonds may be called prior to maturity at a price less than par value. See
"Federal Tax Status" for a discussion of the tax consequenses of owning these
bonds.

    Certain Bonds may be "zero coupon" bonds. Zero coupon bonds are purchased at
a deep discount because the buyer receives only the right to receive a final
payment at the maturity of the bond and does not receive any periodic interest
payments. The effect of owning these bonds is that a fixed yield is earned not
only on the original investment but also, in effect, on all discount earned
during the life of the bond. This implicit reinvestment of earnings at the same
rate eliminates the risk of being unable to reinvest income at a rate as high as
the implicit yield on the discount bond, but at the same time eliminates the
ability to reinvest at higher rates in the future. For this reason, zero coupon
bonds are subject to substantially greater price fluctuations during periods of
changing market interest rates than are bonds of comparable quality which pay
interest.

    Certain Bonds may have been purchased on a "when, as and if issued" or
"delayed delivery" basis. The delivery of these Bonds may be delayed or may not
occur. Interest on these Bonds begins accruing to the benefit of Unitholders on
their respective dates of delivery. To the extent any Bonds are actually
delivered to a Trust after the expected dates of delivery, Unitholders who
purchase their Units prior to the actual delivery date would be required to
adjust their tax basis in their Units for a portion of the interest accruing on
those Bonds during the interval between their purchase of Units and the actual
delivery of the Bonds. As a result of any adjustment, the Estimated Current
Return during the first year would be slightly lower than stated herein.
Unitholders will be "at risk" with respect to all Bonds (i.e., may derive either
gain or loss from fluctuations in the value of the Bonds) from the date they
order Units.

    Certain Bonds may be subject to redemption prior to their stated maturity
date pursuant to sinking fund provisions, call provisions or extraordinary
optional or mandatory redemption provisions or otherwise. A sinking fund is a
reserve fund accumulated over a period of time for retirement of debt. A
callable bond is one which is subject to redemption or refunding prior to
maturity at the option of the issuer. A refunding is a method by which a debt
obligation is redeemed, at or before maturity, by the proceeds of a new debt
obligation. In general, call provisions are more likely to be exercised when the
bond price is at a premium over par than when it is at a discount from par. The
exercise of redemption or call provisions generally will result in the
distribution of principal and may result in a reduction in the amount of
subsequent interest distributions; it may also affect the current return on
Units. See "Portfolio" in Prospectus Part I for a list of the sinking fund and
call provisions, if any, with respect to the Bonds. The Sponsor is unable to
predict all of the circumstances which may result in redemption of a Bond.

    To the best knowledge of the Sponsor, there is no litigation pending as of
the Date of Deposit in respect of any Bonds which might reasonably be expected
to have a material adverse effect upon the Trusts. At any time after the Date of
Deposit, litigation may be initiated on a variety of grounds with respect to the
Bonds. Such litigation may affect the validity of the Bonds or the tax-free
nature of interest payments. While the outcome of litigation can never be
predicted, the Fund has received or will receive opinions of bond counsel to the
issuers of each Bond on the date of issuance to the effect that the Bonds have
been validly issued and interest payments are exempt from Federal income tax. In
addition, other factors may arise from time to time which potentially may impair
the ability of issuers to meet obligations undertaken with respect to the Bonds.

    Like other investment companies, financial and business organizations and
individuals around the world, the Trusts could be adversely affected if the
computer systems used by the Sponsor, Evaluator or Trustee or other service
providers to the Trusts do not properly process and calculate date-related
information and data from and after January 1, 2000. This is commonly known as
the "Year 2000 Problem." While the Sponsor, Evaluator and Trustee are taking
steps that they believe are reasonably designed to address the Year 2000
Problem, there can be no assurance that these steps will be sufficient to avoid
any adverse impact to the Trusts. The Year 2000 Problem may impact certain
issuers of the Bonds to varying degrees, however, the Sponsor is unable to
predict what impact, if any, the Year 2000 Problem will have on any issuer.

ESTIMATED CURRENT AND LONG-TERM RETURNS
- --------------------------------------------------------------------------------

    The Estimated Current Returns and the Estimated Long-Term Returns as of the
Date of Deposit are set forth on the cover of the Prospectus Part I. Estimated
Current Return is calculated by dividing the estimated net annual interest
income per Unit by the Public Offering Price. The estimated net annual interest
income per Unit will vary with changes in fees and expenses of the Trust and
with the principal prepayment, redemption, maturity, exchange or sale of Bonds.
The Public Offering Price will vary with changes in the price of the Bonds.
Accordingly, there is no assurance that the present Estimated Current Return
will be realized in the future. Estimated Long-Term Return is calculated using a
formula which (1) takes into consideration, and determines and factors in the
relative weightings of, the market values, yields (which takes into account the
amortization of premiums and the accretion of discounts) and estimated
retirements of the Bonds and (2) takes into account the expenses and sales
charge associated with Units. Since the value and estimated retirements of the
Bonds and the expenses of a Trust will change, there is no assurance that the
present Estimated Long-Term Return will be realized in the future. The Estimated
Current Return and Estimated Long-Term Return are expected to differ because the
calculation of Estimated Long-Term Return reflects the estimated date and amount
of principal returned while the Estimated Current Return calculation includes
only net annual interest income and Public Offering Price.

    In order to acquire certain Bonds, it may be necessary for the Sponsor or
Trustee to pay amounts covering accrued interest on the Bonds which exceed the
amounts which will be made available through cash furnished by the Sponsor on
the Date of Deposit. This cash may exceed the interest which would accrue to the
First Settlement Date. The Trustee has agreed to pay for any amounts necessary
to cover any excess and will be reimbursed when funds become available from
interest payments on the related Bonds. Also, since interest on any "when, as
and if issued" Bonds does not begin accruing as tax-exempt interest income to
the benefit of Unitholders until the date of delivery, the Trustee may reduce
its fee and pay Trust expenses in order to maintain or approach the same
estimated net annual interest income during the first year of the Trust's
operations as described under "Summary of Essential Financial Information" in
Prospectus Part I.

PUBLIC OFFERING
- --------------------------------------------------------------------------------

    GENERAL. Units are offered at the Public Offering Price. During the initial
offering period the Public Offering Price is based on the aggregate offering
price of the Bonds, the sales charge described below, cash, if any, in the
Principal Account and accrued interest, if any. After the initial public
offering period, the secondary market public offering price is based on the bid
prices of the Bonds, the sales charge described below, cash, if any, in the
Principal Account and accrued interest, if any. The minimum purchase in the
primary and secondary market is one Unit.

    The initial offering period sales charges are as follows:

<TABLE>
<CAPTION>
                                                                   INITIAL OFFERING PERIOD SALES CHARGE
                                                                               AS PERCENT OF
                                                                   ------------------------------------
                                                                   PUBLIC OFFERING       OFFERING PRICE
  TRUST                                                                  PRICE              OF BONDS
 ------------------------------------------------------------------------------------------------------
<S>                                                                <C>                   <C>
  IM-IT, U.S. Territorial IM-IT, Long-Term State and National 
    Quality Trusts                                                       4.900%               5.152%
  IM-IT Limited Maturity Trusts                                          4.300                4.493
  IM-IT Discount Trusts                                                  4.000                4.167
  IM-IT Intermediate Trusts                                              3.900                4.058
  State Intermediate Laddered Maturity Trusts                            3.000                3.093
  IM-IT Short Intermediate Trusts                                        2.000                2.041
</TABLE>

    The sales charge applicable to quantity purchases during the initial
offering period is reduced as follows:

<TABLE>
<CAPTION>
                                                              SALES CHARGE REDUCTION PER UNIT
                                    -----------------------------------------------------------------------------------
                                        IM-IT, U.S.
                                    TERRITORIAL IM-IT,
                                      LONG-TERM STATE
        AGGREGATE NUMBER OF            AND NATIONAL              IM-IT SHORT             IM-IT
         UNITS PURCHASED*             QUALITY TRUSTS         INTERMEDIATE TRUST      DISCOUNT TRUST       OTHER TRUSTS
- -----------------------------       --------------------    --------------------    ----------------      -------------
<S>                                 <C>                     <C>                     <C>                   <C>
100-249 Units                       $               4.00    $               2.00    $           2.00      $        4.00
250-499 Units                       $               6.00    $               3.00    $           4.00      $        6.00
500-999 Units                       $              14.00    $               4.00    $           6.00      $        9.00
1,000 or more Units                 $              19.00    $               6.00    $           8.00      $       11.00
- -----------------------------
</TABLE>

    * The breakpoint sales charges are also applied on a dollar basis
utilizing a breakpoint equivalent in the above table of $1,000 per Unit and will
be applied on whichever basis is more favorable to the investor. The breakpoints
will be adjusted to take into consideration purchase orders stated in dollars
which cannot be completely fulfilled due to the Trusts' requirement that only
whole Units be issued.

    The secondary market sales charge is computed as described in the following
table based upon the estimated long-term return life of a Trust's portfolio:

<TABLE>
<CAPTION>
 YEARS TO MATURITY    SALES CHARGE     YEARS TO MATURITY       SALES CHARGE   YEARS TO MATURITY      SALES CHARGE
 -----------------    ------------     -----------------       ------------   -----------------      ------------
<S>                   <C>              <C>                     <C>            <C>                    <C>
         1                  1.010%            8                      3.627%         15                     5.042%
         2                  1.523             9                      4.167          16                     5.152
         3                  2.041            10                      4.384          17                     5.263
         4                  2.302            11                      4.603          18                     5.374
         5                  2.564            12                      4.712          19                     5.485
         6                  2.828            13                      4.822          20                     5.597
         7                  3.093            14                      4.932          21 to 30               5.708
</TABLE>

    For purposes of computation of the estimated long-term return life, Bonds
will be deemed to mature on their expressed maturity dates unless: (a) the Bonds
have been called for redemption or are subject to redemption at an earlier call
date, in which case this call date will be deemed to be the maturity date; or
(b) the Bonds are subject to a "mandatory tender", in which case the mandatory
tender will be deemed to be the maturity date. The sales charges in the above
table are expressed as a percentage of the aggregate bid prices of the Bonds.
Expressed as a percent of the Public Offering Price, the sales charge on a Trust
consisting entirely of Bonds with 15 years to maturity would be 4.80%. The sales
charges in the table above do not apply to IM-IT Discount Trusts. The applicable
secondary market sales charges for an IM-IT Discount Trust are set forth in the
applicable Prospectus Part I.

    Any reduced sales charge is the responsibility of the selling Underwriter,
broker, dealer or agent. The Sponsor will, however, increase the concession or
agency commission for quantity purchases. The reduced sales charge structure in
the initial offering period sales charge table above will apply on all purchases
by the same person from any one Underwriter or dealer of units of Van Kampen
American Capital-sponsored unit investment trusts which are being offered in the
initial offering period (a) on any one day (the "Initial Purchase Date") or (b)
on any day subsequent to the Initial Purchase Date, if (1) the units purchased
are of a unit investment trust purchased on the Initial Purchase Date, and (2)
the person purchasing the units purchased a sufficient amount of units on the
Initial Purchase Date to qualify for a reduced sales charge on such date. In the
event units of more than one trust are purchased on the Initial Purchase Date,
the aggregate dollar amount of such purchases will be used to determine whether
purchasers are eligible for a reduced sales charge. Such aggregate dollar amount
will be divided by the public offering price per unit (on the day preceding the
date of purchase) of each respective trust purchased to determine the total
number of units which such amount could have purchased of each individual trust.
Purchasers must then consult the applicable trust's prospectus to determine
whether the total number of units which could have been purchased of a specific
trust would have qualified for a reduced sales charge and, if so qualified, the
amount of such reduction. Assuming a purchaser qualifies for a sales charge
reduction or reductions, to determine the applicable sales charge reduction or
reductions it is necessary to accumulate all purchases made on the Initial
Purchase Date and all purchases made in accordance with (b) above. Units
purchased in the name of the spouse of a purchaser or in the name of a child of
such purchaser ("immediate family members") will be deemed for the purposes of
calculating the applicable sales charge to be additional purchases by the
purchaser. The reduced sales charges will also be applicable to a trustee or
other fiduciary purchasing Units for one or more trust, estate or fiduciary
accounts.

    Employees, officers and directors (including their spouses, children,
grandchildren, parents, grandparents, siblings, mothers-in-law, fathers-in-law,
sons-in-law and daughters-in-law, and trustees, custodians or fiduciaries for
the benefit of such persons (collectively referred to herein as "related
purchasers")) of Van Kampen American Capital Distributors, Inc. and its
affiliates and Underwriters and their affiliates may purchase Units at the
Public Offering Price less the applicable underwriting commission or less the
applicable dealer concession in the absence of an underwriting commission.
Employees, officers and directors (including related purchasers) of dealers and
their affiliates and vendors providing services to the Sponsor may purchase
Units at the Public Offering Price less the applicable dealer concession.

    Purchasers of units of any two consecutive series of a Trust may aggregate
purchases of units of such series for purposes of the sales charge reduction for
quantity purchases, provided that at the time of the initial purchase of units
such purchaser submitted a purchase order for at least 100 units that was
partially unfulfilled due to a lack of units of such Trust series available for
sale at such time. The sales charge reduction shall be applied to the subsequent
purchase of units such that the aggregate sales charge reduction applicable to
both purchases will equal the amount described in the initial offering period
sales charge table above.

    Units may be purchased in the primary or secondary market at the Public
Offering Price (for purchases which do not qualify for a sales charge reduction
for quantity purchases) less the concession the Sponsor typically allows to
brokers and dealers for purchases by (1) investors who purchase Units through
registered investment advisers, certified financial planners and registered
broker-dealers who in each case either charge periodic fees for financial
planning, investment advisory or asset management services, or provide such
services in connection with the establishment of an investment account for which
a comprehensive "wrap fee" charge is imposed, (2) bank trust departments
investing funds over which they exercise exclusive discretionary investment
authority and that are held in a fiduciary, agency, custodial or similar
capacity, (3) any person who for at least 90 days, has been an officer, director
or bona fide employee of any firm offering Units for sale to investors or their
immediate family members (as described above) and (4) officers and directors of
bank holding companies that make Units available directly or through
subsidiaries or bank affiliates. Notwithstanding anything to the contrary in
this Prospectus, such investors, bank trust departments, firm employees and bank
holding company officers and directors who purchase Units through this program
will not receive sales charge reductions for quantity purchases.

    OFFERING PRICE. The Public Offering Price of Units will vary from the
amounts stated under "Summary of Essential Financial Information" in Prospectus
Part I in accordance with fluctuations in the prices of the Bonds. The price of
Units on the Date of Deposit was determined by adding the applicable sales
charge to the aggregate offering price of the Bonds and dividing the sum by the
number of Units outstanding. This price determination was made on the basis of
an evaluation of the Bonds prepared by Interactive Data Corporation, a firm
regularly engaged in the business of evaluating, quoting or appraising
comparable securities. During the initial offering period, the Evaluator will
value the Bonds as of the Evaluation Time on days the New York Stock Exchange is
open for business and will adjust the Public Offering Price of Units
accordingly. This Public Offering Price will be effective for all orders
received at or prior to the Evaluation Time on each such day. The "Evaluation
Time" is the close of trading on the New York Stock Exchange on each day that
the Exchange is open for trading. Orders received by the Trustee, Sponsor or any
Underwriter for purchases, sales or redemptions after that time, or on a day
when the New York Stock Exchange is closed, will be held until the next
determination of price. The secondary market Public Offering Price per Unit will
be equal to the aggregate bid price of the Bonds plus the applicable secondary
market sales charge and dividing the sum by the number of Units outstanding. For
secondary market purposes, this computation will be made by the Evaluator as of
the Evaluation Time for each day on which any Unit is tendered for redemption
and as necessary. The offering price of Bonds may be expected to average
approximately 0.5%-1% more than the bid price.

    The aggregate price of the Bonds is determined on the basis of bid prices or
offering prices, as is appropriate, (a) on the basis of current market prices
obtained from dealers or brokers who customarily deal in bonds comparable to
those held by the Fund; (b) if these prices are not available, on the basis of
current market prices for comparable bonds; (c) by causing the value of the
Bonds to be determined by others engaged in the practice of evaluation, quoting
or appraising comparable bonds; or (d) by any combination of the above. Market
prices of the Bonds will generally fluctuate with changes in market interest
rates. Unless Bonds are in default in payment of principal or interest or in
significant risk of default, the Evaluator will not attribute any value to the
insurance obtained by an Insured Trust, if any.

    The Evaluator will consider in its evaluation of Bonds which are in default
in payment of principal or interest or, in the Sponsor's opinion, in significant
risk of default (the "Defaulted Bonds") the value of any insurance guaranteeing
interest and principal payments. The value of the insurance will be equal to the
difference between (i) the market value of Defaulted Bonds assuming the exercise
of the right to obtain Permanent Insurance (less the insurance premiums and
related expenses attributable to the purchase of Permanent Insurance) and (ii)
the market value of Defaulted Bonds not covered by Permanent Insurance. In
addition, the Evaluator will consider the ability of a Portfolio Insurer to meet
its commitments under any insurance policy, including commitments to issue
Permanent Insurance. No value has been ascribed to insurance obtained by an
Insured Trust, if any, as of the date of this Prospectus.

    A person will become the owner of Units on the date of settlement provided
payment has been received. Cash, if any, made available to the Sponsor prior to
the date of settlement for the purchase of Units may be used in the Sponsor's
business and may be deemed to be a benefit to the Sponsor, subject to the
limitations of the Securities Exchange Act of 1934.

    ACCRUED INTEREST. Accrued interest is an accumulation of unpaid interest on
securities which generally is paid semi-annually, although each Trust accrues
interest daily. Because of this, a Trust always has an amount of interest earned
but not yet collected by the Trustee. For this reason, with respect to sales
settling after the First Settlement Date, the proportionate share of accrued
interest to the settlement date is added to the Public Offering Price of Units.
Unitholders will receive the amount of accrued interest paid on their Units on
the next distribution date. In an effort to reduce the accrued interest which
would have to be paid by Unitholders, the Trustee will advance the amount of
accrued interest to the Sponsor as the Unitholder of record as of the First
Settlement Date. Consequently, the accrued interest added to the Public Offering
Price of Units will include only accrued interest from the First Settlement Date
to the date of settlement, less any distributions from the Interest Account
after the First Settlement Date. Because of the varying interest payment dates
of the Bonds, accrued interest at any point in time will be greater than the
amount of interest actually received by a Trust and distributed to Unitholders.
If a Unitholder sells or redeems all or a portion of his Units, he will be
entitled to receive his proportionate share of the accrued interest from the
purchaser of his Units.

    UNIT DISTRIBUTION. Units will be distributed to the public by Underwriters,
broker-dealers and others at the Public Offering Price, plus accrued interest.
The Sponsor intends to qualify Units for sale in a number of states.
Broker-dealers or others will be allowed a concession or agency commission in
connection with the distribution of Units during the initial offering period for
any single transaction as described in the following table, provided that the
Units are acquired from the Sponsor.

<TABLE>
<CAPTION>
                                            IM-IT, U.S.
                                            TERRITORIAL
                                           IM-IT, LONG-                                              IM-IT                STATE
                              IM-IT      TERM STATE AND     IM-IT SHORT             IM-IT          LIMITED         INTERMEDIATE
                           DISCOUNT            NATIONAL    INTERMEDIATE      INTERMEDIATE         MATURITY             LADDERED
                              TRUST      QUALITY TRUSTS           TRUST             TRUST            TRUST       MATURITY TRUST
                        -----------      --------------    ------------       -----------      -----------       --------------
<S>                     <C>                 <C>             <C>               <C>              <C>               <C>           
  1 - 99 Units          $     18.00         $     30.00     $     10.00       $     25.00      $     27.00       $        20.00
  100 - 249 Units       $     19.00         $     32.00     $     11.00       $     28.00      $     30.00       $        21.00
  250 - 499 Units       $     20.00         $     34.00     $     11.00       $     27.00      $     30.00       $        21.00
  500 - 999 Units       $     20.00         $     35.00     $     12.00       $     30.00      $     32.00       $        23.00
  1,000 - 1,499 Units   $     20.00         $     34.00     $     12.00       $     29.00      $     29.00       $        22.00
  1,500 or more Units   $     20.00         $     34.00     $     12.00       $     29.00      $     29.00       $        22.00
</TABLE>

    The increased concession or agency commission is a result of the discount
given to purchasers for quantity purchases. See "Public Offering--General". In
addition to the concessions and agency commissions described in the table,
volume concessions or agency commissions of an additional $5.00 per Unit of an
IM-IT, a U.S. Territorial IM-IT, a Long-Term State or a National Quality Trust
and $2.00 per Unit of all other Trusts will be given to any broker/dealer or
agent (other than Underwriters) who purchases from the Sponsor at least 250
Units of such Trust during the initial offering period. These additional
concessions will be allowed at the time of purchase, provided, however, the
additional concession applicable to initial purchases totaling less than 250
Units will be paid retroactively at the end of the initial offering period. The
breakpoint concessions or agency commissions are also applied on a dollar basis
utilizing a breakpoint equivalent of $1,000 per Unit and will be applied on
whichever basis is more favorable to the distributor. The breakpoints will be
adjusted to take into consideration purchase orders stated in dollars which
cannot be completely fulfilled due to the requirement that only whole Units be
issued. Certain commercial banks may be making Units available to their
customers on an agency basis. A portion of the sales charge paid by these
customers (equal to the agency commission referred to above) is retained by or
remitted to the banks. Any discount provided to investors will be borne by the
selling dealer or agent. For secondary market transactions, the concession or
agency commission will amount to 70% of the applicable sales charge. The Sponsor
reserves the right to reject, in whole or in part, any order for the purchase of
Units and to change the amount of the concession or agency commission to dealers
and others from time to time.

    SPONSOR AND UNDERWRITER COMPENSATION. The Underwriters will receive a gross
sales commission equal to the sales charge applicable to the transaction
involved. "Public Offering--General". The Sponsor will receive from the
Underwriters the excess of this gross sales commission over the amounts set
forth in the following table, as of the Date of Deposit. For a list of the
Underwriters that have purchased Units from the Sponsor, see "Underwriting" in
Prospectus Part I.

<TABLE>
<CAPTION>
                                               IM-IT, U.S.
                                               TERRITORIAL
                                              IM-IT, LONG-                                           IM-IT                STATE
                              IM-IT         TERM STATE AND   IM-IT SHORT            IM-IT          LIMITED         INTERMEDIATE
                           DISCOUNT               NATIONAL  INTERMEDIATE     INTERMEDIATE         MATURITY             LADDERED
                              TRUST         QUALITY TRUSTS         TRUST            TRUST            TRUST       MATURITY TRUST
                        -----------         --------------  ------------      -----------      -----------       --------------
<S>                     <C>                 <C>             <C>               <C>              <C>               <C>           
  1 - 99 Units          $     20.00         $     35.00     $     12.00       $     27.00      $     29.00       $        22.00
  100 - 249 Units       $     21.00         $     37.00     $     13.00       $     30.00      $     32.00       $        23.00
  250 - 499 Units       $     22.00         $     39.00     $     13.50       $     29.50      $     32.00       $        23.00
  500 - 999 Units       $     22.00         $     40.00     $     14.00       $     32.50      $     34.50       $        25.00
  1,000 - 1,499 Units   $     22.00         $     39.00     $     14.00       $     31.00      $     31.00       $        24.00
  1,500 or more Units   $     22.00         $     39.00     $     14.00       $     31.00      $     31.00       $        24.00
</TABLE>

    A. G. Edwards & Sons, Inc. which acts as a Managing Underwriter of Units of
the various series of the IM-IT or National Quality Trust, will receive from the
Sponsor reimbursement for certain costs and further compensation in the amount
of $5.00 for each Unit of the IM-IT or National Quality Trust it underwrites. In
addition, the Sponsor will receive from the Managing Underwriters of any
National Quality, (who underwrite 15% of the Trust involved or 1,000 Units of
such Trust, whichever is greater) the excess of such gross sales commission over
$38.00 per Unit of any such Trust, as of the Date of Deposit. Also, any such
Managing Underwriter that sells a total of 25% or 1,500 Units, whichever is
greater, of any individual series of such Trusts will receive an additional
$2.00 per each such Unit. In connection with quantity sales to purchasers of any
Pennsylvania IM-IT Trust the Underwriters will receive from the Sponsor
commissions totalling $35.00 per Unit for any single transaction of 100 to 249
Units, $36.00 per Unit for any single transaction of 250 to 499 units, $37.00
per Unit for any single transaction of 500 to 999 Units and $38.00 per Unit for
any single transaction of 1,000 or more Units. In addition, any Underwriter that
sells a total of 25% or 1,500 Units, whichever is greater, of any Pennsylvania
IM-IT Trust will receive an additional $2.00 per each such Unit. In addition,
the Sponsor has entered into agreements with Advest, Inc. ("Advest") and Gruntal
& Co., Inc. ("Gruntal") whereby Advest and Gruntal will receive an additional
$2.00 per Unit in connection with a minimum commitment of 1,500 Units of any New
York IM-IT Trust. In addition, the Sponsor and J. J. B. Hilliard, W. L. Lyons,
Inc. ("Hilliard, Lyons") have entered into an agreement under which Hilliard,
Lyons may receive an additional $2.00 for each Unit of the Kentucky Quality
Trust which it underwrites, provided it underwrites a minimum of 400 Units of
such Trust. Further, each Underwriter who underwrites 1,000 or more Units in any
Trust will receive additional compensation from the Sponsor of $1.00 for each
Unit it underwrites. The breakpoints listed herein will also be applied on a
dollar basis utilizing a breakpoint equivalent of $1,000 per Unit and will be
applied on whichever basis is more favorable to the Underwriter.

    In addition, the Sponsor and certain Underwriters will realize a profit or
loss, as a result of the difference between the price paid for the Bonds by the
Sponsor and the cost of the Bonds to a Trust. See "Portfolio" and "Notes to
Portfolio" in Prospectus Part I. Underwriters may also realize profits or losses
with respect to Bonds which were acquired by the Sponsor from underwriting
syndicates of which they were members. The Sponsor has not participated as sole
underwriter or as manager or as a member of the underwriting syndicates from
which the Bonds in the Trusts were acquired. Underwriters may further realize
profit or loss during the initial offering period as a result of possible
fluctuations in the market value of the Bonds since all proceeds received from
purchasers of Units (excluding dealer concessions or agency commissions allowed,
if any) will be retained by the Underwriters. Affiliates of an Underwriter are
entitled to the same dealer concessions or agency commissions that are available
to the Underwriter. In addition to any other benefits Underwriters may realize
from the sale of Units, the Sponsor will share on a pro rata basis among senior
Underwriters (those who underwrite at least 250 Units) 50% of any gain (less
deductions for accrued interest and certain costs) represented by the difference
between the cost of the Bonds to the Sponsor and the evaluation of the Bonds on
the Date of Deposit. The Sponsor and certain of the other Underwriters will also
realize profits or losses in the amount of any difference between the price at
which Units are purchased and the price at which Units are resold in connection
with maintaining a secondary market for Units and will also realize profits or
losses resulting from a redemption of repurchased Units at a price above or
below the purchase price.

    Underwriters and broker-dealers of the Trusts, banks and/or others are
eligible to participate in a program in which such firms receive from the
Sponsor a nominal award for each of their representatives who have sold a
minimum number of units of unit investment trusts created by the Sponsor during
a specified time period. In addition, at various times the Sponsor may implement
other programs under which the sales forces of such firms may be eligible to win
other nominal awards for certain sales efforts, or under which the Sponsor will
reallow to any such firms that sponsor sales contests or recognition programs
conforming to criteria established by the Sponsor, or participate in sales
programs sponsored by the Sponsor, an amount not exceeding the total applicable
sales charges on the sales generated by such persons at the public offering
price during such programs. Also, the Sponsor in its discretion may from time to
time pursuant to objective criteria established by the Sponsor pay fees to
qualifying firms for certain services or activities which are primarily intended
to result in sales of Units of the Trusts. Such payments are made by the Sponsor
out of its own assets, and not out of the assets of the Trusts. These programs
will not change the price Unitholders pay for their Units or the amount that the
Trusts will receive from the Units sold. Approximately every eighteen months the
Sponsor holds a business seminar which is open to Underwriters that sell units
of trusts it sponsors. The Sponsor pays substantially all costs associated with
the seminar, excluding Underwriter travel costs. Each Underwriter is invited to
send a certain number of representatives based on the gross number of units such
firm underwrites during a designated time period.

    MARKET FOR UNITS. Although not obligated to do so, the Sponsor intends to,
and certain of the other Underwriters may, maintain a market for Units and offer
to purchase Units at prices, subject to change at any time, based upon the
aggregate bid prices of the Bonds plus accrued interest and any principal cash
on hand, less any amounts representing taxes or other governmental charges
payable out of the Trust and less any accrued Trust expenses. If the supply of
Units exceeds demand or if some other business reason warrants it, the Sponsor
and/or the Underwriters may either discontinue all purchases of Units or
discontinue purchases of Units at these prices. If a market is not maintained
and the Unitholder cannot find another purchaser, a Unitholder will be able to
dispose of Units by tendering them to the Trustee for redemption at the
Redemption Price. See "Rights of Unitholders--Redemption of Units". A Unitholder
who wishes to dispose of his Units should inquire of his broker as to current
market prices in order to determine whether there is in any price in excess of
the Redemption Price and, if so, the amount thereof. The Trustee will notify the
Sponsor of any tender of Units for redemption. If the Sponsor's bid in the
secondary market at that time equals or exceeds the Redemption Price per Unit,
it may purchase the Units not later than the day on which the Units would
otherwise have been redeemed by the Trustee.

RIGHTS OF UNITHOLDERS
- --------------------------------------------------------------------------------

    DISTRIBUTIONS OF INTEREST AND PRINCIPAL. Interest received by a Trust, pro
rated on an annual basis, will be distributed monthly unless a Unitholder elects
to receive semi-annual distributions. The amount and time of the first
distribution is described in Prospectus Part I under "Summary of Essential
Financial Information". The plan of distribution selected by a Unitholder will
remain in effect until changed. Unitholders who purchase Units in the secondary
market will receive distributions in accordance with the election of the prior
owner. Unitholders may change their distribution plan by indicating the change
on a card which may be obtained from the Trustee and return the card to the
Trustee with their certificates and other documentation required by the Trustee.
Certificates should be sent by registered or certified mail to avoid their being
lost or stolen. If the card and certificate are properly presented to the
Trustee, the change will become effective on the first day after the next
semi-annual record date and will remain effective until changed.

    Interest received by a Trust, including that part of the proceeds of any
disposition of Bonds which represents accrued interest, is credited by the
Trustee to the Interest Account. Other receipts are credited to the Principal
Account. After deduction of amounts sufficient to reimburse the Trustee, without
interest, for any amounts advanced and paid to the Sponsor as the Unitholder of
record as of the First Settlement Date, interest received will be distributed on
each distribution date to Unitholders of record as of the preceding record date.
All distributions will be net of estimated expenses. Funds in the Principal
Account will be distributed on each semi-annual distribution date to Unitholders
of record as of the preceding semi-annual record date. The Trustee is not
required to pay interest on funds held in the Principal or Interest Account (but
may itself earn interest thereon and therefore benefits from the use of these
funds) nor to make a distribution from the Principal Account unless the amount
available for distribution therein shall equal at least $1.00 per Unit. However,
should the amount available for distribution in the Principal Account equal or
exceed $10.00 per Unit, the Trustee will make a special distribution from the
Principal Account on the next monthly distribution date to Unitholders of record
on the related monthly record date.

    Because interest payments are not received by a Trust at a constant rate
throughout the year, interest distributions may be more or less than the amount
credited to the Interest Account as of the record date. For the purpose of
minimizing fluctuations in interest distributions, the Trustee is authorized to
advance amounts necessary to provide interest distributions of approximately
equal amounts. The Trustee is reimbursed for these advances from funds in the
Interest Account on the next record date. Persons who purchase Units between a
record date and a distribution date will receive their first distribution on the
second distribution date after the purchase, under the applicable plan of
distribution.

    REINVESTMENT OPTION. Unitholders may elect to have distributions on their
Units automatically reinvested in shares of certain Van Kampen American Capital
or Morgan Stanley mutual funds which are registered in the Unitholder's state of
residence (the "Reinvestment Funds"). Each Reinvestment Fund has investment
objectives that differ from those of the Trusts. The prospectus relating to each
Reinvestment Fund describes its investment policies and the procedures to follow
to begin reinvestment. A Unitholder may obtain a prospectus for the Reinvestment
Funds from Van Kampen American Capital Distributors, Inc. at One Parkview Plaza,
Oakbrook Terrace, Illinois 60181.

    After becoming a participant in a reinvestment plan, each Trust distribution
will automatically be applied on the applicable distribution date to purchase
shares of the applicable Reinvestment Fund at a net asset value computed on such
date. Unitholders with an existing Guaranteed Reinvestment Option (GRO) Program
account (whereby a sales charge is imposed on distribution reinvestments) may
transfer their existing account into a new GRO account which allows purchases of
Reinvestment Fund shares at net asset value. Confirmations of all reinvestments
will be mailed to the Unitholder by the Reinvestment Fund. A participant may
elect to terminate his or her reinvestment plan and receive future distributions
in cash by notifying the Trustee in writing at least five days before the next
distribution date. Each Reinvestment Fund, its sponsor and investment adviser
have the right to terminate its reinvestment plan at any time. Unitholders of
New York Trusts who are New York residents may elect to have distributions
reinvested in shares of First Investors New York Insured Tax Free Fund, Inc.
subject to a sales charge of $1.50 per $100 reinvested (paid to First Investors
Management Company, Inc.).

    REDEMPTION OF UNITS. A Unitholder may redeem all or a portion of his Units
by tender to the Trustee, at its Unit Investment Trust Division, 101 Barclay
Street, 20th Floor, New York, New York 10286, of the certificates representing
the Units to be redeemed, duly endorsed or accompanied by proper instruments of
transfer with signature guaranteed (or by providing satisfactory indemnity, such
as in connection with lost, stolen or destroyed certificates) and by payment of
applicable governmental charges, if any. Redemption of Units cannot occur until
certificates representing the Units or satisfactory indemnity have been received
by the Trustee. No later than seven calendar days following satisfactory tender,
the Unitholder will receive an amount for each Unit equal to the Redemption
Price per Unit next computed after receipt by the Trustee of the tender of
Units. The "date of tender" is deemed to be the date on which Units are received
by the Trustee, except that as regards Units received after the Evaluation Time
on days of trading on the New York Stock Exchange, the date of tender is the
next day on which that Exchange is open and the Units will be deemed to have
been tendered to the Trustee on that day for redemption at the Redemption Price.

    Under Internal Revenue Service regulations, the Trustee is required to
withhold a specified percentage of a Unit redemption if the Trustee has not
received the Unitholder's tax identification number as required by such
regulations. Any amount withheld is transmitted to the Internal Revenue Service
and may be recovered by the Unitholder only when filing a return. Under normal
circumstances the Trustee obtains the Unitholder's tax identification number
from the selling broker. However, at any time a Unitholder elects to tender
Units for redemption, the Unitholder should provide a tax identification number
to the Trustee in order to avoid this possible "back-up withholding".

    The Redemption Price per Unit (as well as the secondary market Public
Offering Price) will be determined on the basis of the bid price of the Bonds as
of the Evaluation Time on days of trading on the New York Stock Exchange on the
date any such determination is made. The Evaluator determines the Redemption
Price per Unit on days Units are tendered for redemption. The Redemption Price
per Unit is the pro rata share of each Unit on the basis of (i) the cash on hand
in the Trust or moneys in the process of being collected, (ii) the value of the
Bonds based on the bid prices of the Bonds, except for cases in which the value
of insurance has been included, (iii) accrued interest, less (a) amounts
representing taxes or other governmental charges and (b) the accrued Trust
expenses. The Evaluator may determine the value of the Bonds by employing any of
the methods set forth in "Public Offering--Offering Price". In determining the
Redemption Price per Unit no value will be assigned to the portfolio insurance
maintained on the Bonds in an Insured Trust unless the Bonds are in default in
payment of principal or interest or in significant risk of default. For a
description of the situations in which the Evaluator may value the insurance
obtained by the Insured Trusts, see "Public Offering--Offering Price". Accrued
interest paid on redemption shall be withdrawn from the Interest Account or, if
the balance therein is insufficient, from the Principal Account. All other
amounts will be withdrawn from the Principal Account. Units so redeemed shall be
cancelled.

    The price at which Units may be redeemed could be less than the price paid
by the Unitholder and may be less than the par value of the Bonds represented by
the Units redeemed. The Trustee may sell Bonds to cover redemptions. When Bonds
are sold, the size and diversity of the Trust will be reduced. Sales may be
required at a time when Bonds would not otherwise be sold and might result in
lower prices than might otherwise be realized.

    The right of redemption may be suspended and payment postponed for any
period during which the New York Stock Exchange is closed, other than for
customary weekend and holiday closings, or during which the SEC determines that
trading on that Exchange is restricted or an emergency exists, as a result of
which disposal or evaluation of the Bonds is not reasonably practicable, or for
other periods as the SEC may by order permit. Under certain extreme
circumstances the Sponsor may apply to the SEC for an order permitting a full or
partial suspension of the right of Unitholders to redeem their Units.

    CERTIFICATES. Ownership of Units is evidenced by certificates unless a
Unitholder makes a written request to the Trustee that ownership be in book
entry form. Units are transferable by making a written request to the Trustee
and, in the case of Units in certificate form, by presentation and surrender of
the certificate to the Trustee properly endorsed or accompanied by a written
instrument or instruments of transfer. A Unitholder must sign the written
request, or certificate transfer instrument, exactly as his name appears on the
records of the Trustee and on the face of any certificate with the signature
guaranteed by a participant in the Securities Transfer Agents Medallion Program
("STAMP") or a signature guaranty program accepted by the Trustee. The Trustee
may require additional documents such as, but not limited to, trust instruments,
certificates of death, appointments as executor or administrator or certificates
of corporate authority. Certificates will be issued in denominations of one Unit
or any multiple thereof. Although no such charge is now made, the Trustee may
require a Unitholder to pay a reasonable fee for each certificate re-issued or
transferred and to pay any governmental charge that may be imposed in connection
with each transfer or interchange. Destroyed, stolen, mutilated or lost
certificates will be replaced upon delivery to the Trustee of satisfactory
indemnity, evidence of ownership and payment of expenses incurred. Mutilated
certificates must be surrendered to the Trustee for replacement.

    REPORTS PROVIDED. Unitholders will receive a statement of interest and other
receipts received for each distribution. For as long as the Sponsor deems it to
be in the best interest of Unitholders, the accounts of each Trust will be
audited annually by independent certified public accountants and the report of
the accountants will be furnished to Unitholders upon request. Within a
reasonable period of time after the end of each year, the Trustee will furnish
to each person who was a registered Unitholder during that year a statement
describing the interest and principal received on the Bonds, actual Trust
distributions, Trust expenses, a list of the Bonds and other Trust information.
Unitholders will be furnished the Evaluator's evaluations of the Bonds upon
request.

INSURANCE ON THE BONDS IN THE INSURED TRUSTS
- --------------------------------------------------------------------------------

    Insurance has been obtained guaranteeing prompt payment of interest and
principal, when due, in respect of the Bonds in each Insured Trust. An insurance
policy obtained by an Insured Trust, if any, is non-cancellable and will
continue in force so long as the Trust is in existence, the respective Portfolio
Insurer is still in business and the Bonds described in the policy continue to
be held by the Trust. Any portfolio insurance premium for an Insured Trust is
paid by the Trust on a monthly basis. The premium for any Preinsured Bond
insurance has been paid by the issuer, by a prior owner of the Bonds or the
Sponsor and any policy is non-cancellable and will continue in force so long as
the Bonds so insured are outstanding and the Preinsured Bond Insurer remains in
business. The Portfolio Insurers and the Preinsured Bond Insurers are described
in "Portfolio" and the notes thereto in Prospectus Part I. The Portfolio
Insurers are either AMBAC Assurance Corporation or Financial Guaranty Insurance
Company. More detailed information regarding insurance on the Bonds and the
Preinsured Bond and Portfolio Insurers is included in the Information
Supplement. See "Additional Information".

    The portfolio insurance obtained by an Insured Trust, if any, guarantees the
timely payment of principal and interest on the Bonds when they fall due. For
this purpose, "when due" generally means the stated payment or maturity date for
the payment of principal and interest. However, in the event (a) an issuer
defaults in the payment of principal or interest, (b) an issuer enters into a
bankruptcy proceeding or (c) the maturity of the Bond is accelerated, the
affected Portfolio Insurer has the option to pay the outstanding principal
amount of the Bond plus accrued interest to the date of payment and thereby
retire the Bond from the Trust prior to the Bond's stated maturity date. The
insurance does not guarantee the market value of the Bonds or the value of the
Units. The Trustee, upon the sale of a Bond covered under a portfolio insurance
policy has the right to obtain permanent insurance with respect to the Bond
(i.e., insurance to maturity of the Bond regardless of the identity of the
holder) (the "Permanent Insurance") upon the payment of a single predetermined
insurance premium and expenses from the proceeds of the sale of the Bond. It is
expected that the Trustee would exercise the right to obtain Permanent Insurance
only if upon exercise the Trust would receive net proceeds in excess of the sale
proceeds if the Bonds were sold on an uninsured basis.

    The following summary information relating to the listed insurance companies
has been obtained from publicly available information:

<TABLE>
<CAPTION>
                                                     FINANCIAL INFORMATION (IN MILLIONS OF DOLLARS)
                                                     ----------------------------------------------
                                                          ADMITTED              POLICYHOLDERS'
NAME                                                       ASSETS                  SURPLUS
- ---------------------------------------------------------------------------------------------------
<S>                                                       <C>                     <C>
AMBAC Assurance Corporation (at 6/30/97)                  $  2,736                $   1,548
Capital Markets Assurance Corporation (at 9/30/97)             351                      192
Financial Guaranty Insurance Company (at 9/30/97)            2,531                    1,247
Financial Security Assurance, Inc. (at 9/30/97)              1,404                      517
MBIA Insurance Corporation (at 9/30/97)                      5,100                    1,700
</TABLE>

    Because the Bonds are insured by Portfolio Insurers or Preinsured Bond
Insurers as to the timely payment of principal and interest, when due, and on
the basis of the various reinsurance agreements in effect, Standard & Poor's has
assigned to the Units of each Insured Trust its "AAA" investment rating. This
rating will be in effect for a period of thirteen months from the Date of
Deposit and will, unless renewed, terminate at the end of such period. See
"Description of Ratings" in the Information Supplement. This rating should not
be construed as an approval of the offering of the Units by Standard & Poor's or
as a guarantee of the market value of the Trust or of the Units.

    Each Portfolio Insurer is subject to regulation by the department of
insurance in the state in which it is qualified to do business. Such regulation,
however, is no guarantee that each Portfolio Insurer will be able to perform on
its contract of insurance in the event a claim should be made. At the date
hereof, it is reported that no claims have been submitted or are expected to be
submitted to any of the Portfolio Insurers which would materially impair the
ability of any such company to meet its commitment pursuant to any contract of
insurance. The information relating to each Portfolio Insurer has been furnished
by such companies. The financial information with respect to each Portfolio
Insurer appears in reports filed with state insurance regulatory authorities and
is subject to audit and review by such authorities. No representation is made
herein as to the accuracy or adequacy of such information or as to the absence
of material adverse changes in such information subsequent to the dates thereof.

FUND ADMINISTRATION
- --------------------------------------------------------------------------------

    SPONSOR. Van Kampen American Capital Distributors, Inc., a Delaware
corporation, is the Sponsor of the Trust. The Sponsor is an indirect subsidiary
of VK/AC Holding, Inc. VK/AC Holding, Inc. is a wholly owned subsidiary of MSAM
Holdings II, Inc., which in turn is a wholly owned subsidiary of Morgan Stanley,
Dean Witter, Discover & Co. ("MSDWD").

    MSDWD is a global financial services firm with a market capitalization
of more than $21 billion, which was created by the merger of Morgan Stanley
Group Inc. with Dean Witter, Discover & Co. on May 31, 1997. MSDWD, together
with various of its directly and indirectly owned subsidiaries, is engaged in a
wide range of financial services through three primary businesses: securities,
asset management and credit services. These principal businesses include
securities underwriting, distribution and trading; merger, acquisition,
restructuring and other corporate finance advisory activities; merchant banking;
stock brokerage and research services; asset management; trading of futures,
options, foreign exchange commodities and swaps (involving foreign exchange,
commodities, indices and interest rates); real estate advice, financing and
investing; global custody, securities clearance services and securities lending;
and credit card services. As of June 2, 1997, MSDWD, together with its
affiliated investment advisory companies, had approximately $270 billion of
assets under management, supervision or fiduciary advice.

    Van Kampen American Capital Distributors, Inc. specializes in the
underwriting and distribution of unit investment trusts and mutual funds with
roots in money management dating back to 1926. The Sponsor is a member of the
National Association of Securities Dealers, Inc. and has offices at One Parkview
Plaza, Oakbrook Terrace, Illinois 60181, (630) 684-6000 and 2800 Post Oak
Boulevard, Houston, Texas 77056, (713) 993-0500. It maintains a branch office in
Philadelphia and has regional representatives in Atlanta, Dallas, Los Angeles,
New York, San Francisco, Seattle and Tampa. As of November 30, 1996, the total
stockholders' equity of Van Kampen American Capital Distributors, Inc. was
$129,451,000 (unaudited). (This paragraph relates only to the Sponsor and not to
the Fund or to any other Series thereof. The information is included herein only
for the purpose of informing investors as to the financial responsibility of the
Sponsor and its ability to carry out its contractual obligations. More detailed
financial information will be made available by the Sponsor upon request.)

    As of March 31, 1997, the Sponsor and its Van Kampen American Capital
affiliates managed or supervised approximately $58.45 billion of investment
products, of which over $10.85 billion is invested in municipal bonds. The
Sponsor and its Van Kampen American Capital affiliates managed $47 billion of
assets, consisting of $29.23 billion for 59 open-end mutual funds (of which 46
are distributed by Van Kampen American Capital Distributors, Inc.) $13.4 billion
for 37 closed-end funds and $4.97 billion for 106 institutional accounts. The
Sponsor has also deposited approximately $26 billion of unit investment trusts.
All of Van Kampen American Capital's open-end funds, closed-ended funds and unit
investment trusts are professionally distributed by leading financial firms
nationwide. Based on cumulative assets deposited, the Sponsor believes that it
is the largest sponsor of insured municipal unit investment trusts, primarily
through the success of its Insured Municipals Income Trust(R) or the IM-IT(R)
trust. The Sponsor also provides surveillance and evaluation services at cost
for approximately $13 billion of unit investment trust assets outstanding. Since
1976, the Sponsor has serviced over two million investor accounts, opened
through retail distribution firms.

    If the Sponsor shall fail to perform any of its duties under the Trust
Agreement or become incapable of acting or become bankrupt or its affairs are
taken over by public authorities, then the Trustee may (i) appoint a successor
Sponsor at rates of compensation deemed by the Trustee to be reasonable and not
exceeding amounts prescribed by the SEC, (ii) terminate the Trust Agreement and
liquidate the Fund as provided therein or (iii) continue to act as Trustee
without terminating the Trust Agreement.

    TRUSTEE. The Trustee is The Bank of New York, a trust company organized
under the laws of New York. The Bank of New York has its unit investment trust
division offices at 101 Barclay Street, New York, New York 10286, telephone
(800) 221-7668. The Bank of New York is subject to supervision and examination
by the Superintendent of Banks of the State of New York and the Board of
Governors of the Federal Reserve System, and its deposits are insured by the
Federal Deposit Insurance Corporation to the extent permitted by law. Additional
information regarding the Trustee is set forth in the Information Supplement,
including the Trustee's qualifications and duties, its ability to resign, the
effect of a merger involving the Trustee and the Sponsor's ability to remove and
replace the Trustee. See "Additional Information".

    PORTFOLIO ADMINISTRATION. The Trusts are not managed funds and, except as
provided in the Trust Agreement, Bonds generally will not be sold or replaced.
The Sponsor may, however, direct that Bonds be sold in certain limited
situations to protect to the Trust based on advice from the Evaluator. These
situations may include default in interest or principal payments on the Bonds or
other obligations of an issuer, an advanced refunding or institution of certain
legal proceedings. In addition, the Trustee may sell Bonds designated by the
Evaluator for purposes of redeeming Units or payment of expenses. The Evaluator
will consider a variety of factors in designating Bonds to be sold including
interest rates, market value and marketability. Except in limited circumstances,
the Trustee must reject any offer by an issuer to issue bonds in exchange or
substitution for the Bonds (such as a refunding or refinancing plan). The
Trustee will promptly notify Unitholders of any exchange or substitution. The
Information Supplement contains a more detailed description of circumstances in
which Bonds may be sold or replaced. See "Additional Information".

    REPLACEMENT BONDS. No assurance can be given that a Trust will retain its
present size or composition because Bonds may be sold, redeemed or mature from
time to time and the proceeds will be distributed to Unitholders and will not be
reinvested. In the event of a failure to deliver any Bond that has been
purchased under a contract ("Failed Bonds"), the Sponsor is authorized under the
Trust Agreement to direct the Trustee to acquire other bonds ("Replacement
Bonds") to make up the original portfolio of a Trust. Replacement Bonds must be
purchased within 20 days after delivery of the notice of the failed contract and
the purchase price (exclusive of accrued interest) may not exceed the amount of
funds reserved for the purchase of the Failed Bonds. The Replacement Bonds must
be substantially identical to the Failed Bonds in terms of (i) the exemption
from federal and state taxation, (ii) maturity, (iii) yield to maturity and
current return, (iv) Standard & Poor's or Moody's ratings, and (v) insurance in
an Insured Trust. The Trustee shall notify all Unitholders of a Trust within
five days after the acquisition of a Replacement Bond and shall make a pro rata
distribution of the amount, if any, by which the cost of the Failed Bond
exceeded the cost of the Replacement Bond plus accrued interest. If Failed Bonds
are not replaced, the Sponsor will refund the sales charge attributable to the
Failed Bonds to all Unitholders of the Trust and distribute the principal and
accrued interest (at the coupon rate of the Failed Bonds to the date of removal
from the Trust) attributable to the Failed Bonds within 30 days after removal.
All interest paid to a Unitholder which accrued after the expected date of
settlement for Units will be paid by the Sponsor and accordingly will not be
treated as tax-exempt income. If Failed Bonds are not replaced, the Estimated
Net Annual Interest Income per Unit would be reduced and the Estimated Current
Return and Estimated Long-Term Return might be lowered. Unitholders may not be
able to reinvest their proceeds in other securities at a yield equal to or in
excess of the yield of the Failed Bonds.

    AMENDMENT OF TRUST AGREEMENT. The Sponsor and the Trustee may amend the
Trust Agreement without the consent of Unitholders to correct any provision
which may be defective or to make other provisions that will not adversely
affect the interest of the Unitholders (as determined in good faith by the
Sponsor and the Trustee). The Trust Agreement may not be amended to increase the
number of Units or to permit the acquisition of Bonds in addition to or in
substitution for any of the Bonds initially deposited in the Trust, except for
the substitution of certain refunding Bonds. The Trustee will notify Unitholders
of any amendment.

    TERMINATION OF TRUST AGREEMENT. A Trust will terminate upon the redemption,
sale or other disposition of the last Bond held in the Trust. A Trust may also
be terminated at any time by consent of Unitholders of 51% of the Units then
outstanding or by the Trustee when the value of the Trust is less than 20% of
the original principal amount of Bonds. The Trustee will notify each Unitholder
of any termination within a reasonable time and will then liquidate any
remaining Bonds. The sale of Bonds upon termination may result in a lower amount
than might otherwise be realized if sale were not required at that time. For
this reason, among others, the amount realized by a Unitholder upon termination
may be less than the principal amount of Bonds per Unit or value at the time of
purchase. The Trustee will distribute to each Unitholder his share of the
balance of the Interest and Principal Accounts after deduction of costs,
expenses or indemnities. The Unitholder will receive a final distribution
statement with this distribution. When the Trustee in its sole discretion
determines that any amounts held in reserve are no longer necessary, it will
distribute these amounts to Unitholders. The Information Supplement contains
further information regarding termination of a Trust. See "Additional
Information".

    LIMITATION ON LIABILITIES. The Sponsor, Evaluator and Trustee shall be
under no liability to Unitholders for taking any action or for refraining from
taking any action in good faith pursuant to the Trust Agreement, or for errors
in judgment, but shall be liable only for their own willful misfeasance, bad
faith or gross negligence (negligence in the case of the Trustee) in the
performance of their duties or by reason of their reckless disregard of their
obligations and duties hereunder. The Trustee shall not be liable for
depreciation or loss incurred by reason of the sale by the Trustee of any of the
Bonds. In the event of the failure of the Sponsor to act under the Trust
Agreement, the Trustee may act thereunder and shall not be liable for any action
taken by it in good faith under the Trust Agreement. The Trustee is not liable
for any taxes or governmental charges imposed on the Bonds, on it as Trustee
under the Trust Agreement or on the Fund which the Trustee may be required to
pay under any present or future law of the United States of America or of any
other taxing authority having jurisdiction. In addition, the Trust Agreement
contains other customary provisions limiting the liability of the Trustee. The
Trustee and Sponsor may rely on any evaluation furnished by the Evaluator and
have no responsibility for the accuracy thereof. Determinations by the Evaluator
shall be made in good faith upon the basis of the best information available to
it; provided, however, that the Evaluator shall be under no liability to the
Trustee, Sponsor or Unitholders for errors in judgment.

FEDERAL TAX STATUS
- --------------------------------------------------------------------------------

    At the respective times of issuance of the Bonds, opinions relating to the
validity thereof and to the exclusion of interest thereon from Federal gross
income were rendered by bond counsel to the respective issuing authorities. In
addition, with respect to State Trusts, where applicable, bond counsel to the
issuing authorities rendered opinions as to the exemption of interest on such
Bonds when held by residents of the State in which the issuers of such Bonds are
located from state income taxes and certain state or local intangibles and local
income taxes. Neither the Sponsor nor Chapman and Cutler have made any review of
the Trust proceedings relating to the issuance of the Bonds or of the basis of
such opinions. If the interest on a Bond should be determined to be taxable, the
Bond would generally have to be sold at a substantial discount. In addition,
investors could be required to pay income tax on interest received prior to the
date on which interest is determined to be taxable. Gain realized on the sale or
redemption of the Bonds by the Trustee or of a Unit by a Unitholder is
includible in gross income for Federal income tax purposes and may be includible
in gross income for state tax purposes. Such gain does not include any amounts
received in respect of accrued interest or accrued original issue discount, if
any. If a Bond is acquired with accrued interest, that portion of the price paid
for the accrued interest is added to the tax basis of the Bond. When this
accrued interest is received, it is treated as a return of capital and reduces
the tax basis of the Bond. If a Bond is purchased for a premium, the amount of
the premium is added to the tax basis of the Bond. Bond premium is amortized
over the remaining term of the Bond, and the tax basis of the Bond is reduced
each tax year by the amount of the premium amortized in that tax year. For
purposes of the following opinions, it is assumed that each asset of the Trust
is debt, the interest on which is excluded for Federal income tax purposes.

    In the opinion of Chapman and Cutler, counsel for the Sponsor, under
existing law as of the date of this Prospectus:

   (1)  Each Trust is not an association taxable as a corporation for Federal
        income tax purposes and interest and accrued original issue discount on
        Bonds which is excludable from gross income under the Internal Revenue
        Code of 1986 (the "Code") will retain its status for Federal income tax
        purposes, when received by a Trust and when distributed to Unitholders;
        however such interest may be taken into account in computing the
        alternative minimum tax, an additional tax on branches of foreign 
        corporations and the environmental tax (the "Superfund Tax"), as noted
        below;

   (2)  Each Unitholder is considered to be the owner of a pro rata portion of
        each asset of the respective Trust under subpart E, subchapter J of
        chapter 1 of the Code and will have a taxable event when such Trust
        disposes of a Bond, or when the Unitholder redeems or sells his Units.
        If the Unitholder disposes of a Unit, he is deemed thereby to have
        disposed of his entire pro rata interest in all assets of the Trust
        involved including his pro rata portion of all the Bonds represented by
        a Unit. Legislative proposals have been made that would treat certain
        transactions designed to reduce or eliminate risk of loss and
        opportunities for gain as constructive sales for purposes of recognition
        of gain (but not loss). Unitholders should consult their own tax
        advisors with regard to any such constructive sale rules. Unitholders
        must reduce the tax basis of their Units for their share of accrued
        interest received by the respective Trust, if any, on Bonds delivered
        after the Unitholders pay for their Units to the extent that such
        interest accrued on such Bonds before the date the Trust acquired
        ownership of the Bonds (and the amount of this reduction may exceed the
        amount of accrued interest paid to the seller) and, consequently, such
        Unitholders may have an increase in taxable gain or reduction in capital
        loss upon the disposition of such Units. Gain or loss upon the sale or
        redemption of Units is measured by comparing the proceeds of such sale
        or redemption with the adjusted basis of the Units. If the Trustee
        disposes of Bonds (whether by sale, payment on maturity, redemption or
        otherwise), gain or loss is recognized to the Unitholder (subject to
        various non-recognition provisions of the Code). The amount of any such
        gain or loss is measured by comparing the Unitholder's pro rata share of
        the total proceeds from such disposition with the Unitholder's basis for
        his or her fractional interest in the asset disposed of. In the case of
        a Unitholder who purchases Units, such basis (before adjustment for
        accrued original issue discount and amortized bond premium, if any) is
        determined by apportioning the cost of the Units among each of the Trust
        assets ratably according to value as of the valuation date nearest the
        date of acquisition of the Units. It should be noted that certain
        legislative proposals have been made which could affect the calculation
        of basis for Unitholders holding securities that are substantially
        identical to the Bonds. Unitholders should consult their own tax
        advisors with regard to the calculation of basis. The tax basis
        reduction requirements of the Code relating to amortization of bond
        premium may, under some circumstances, result in the Unitholder
        realizing a taxable gain when his Units are sold or redeemed for an
        amount less than or equal to his original cost;

   (3)  Any proceeds paid under an insurance policy or policies dated the Date
        of Deposit, issued to an Insured Trust with respect to the Bonds which
        represent maturing interest on defaulted obligations held by the Trustee
        will be excludable from Federal gross income if, and to the same extent
        as, such interest would have been so excludable if paid in the normal
        course by the issuer of the defaulted obligations provided that, at the
        time such policies are purchased, the amounts paid for such policies are
        reasonable, customary and consistent with the reasonable expectation
        that the issuer of the obligations, rather than the insurer, will pay
        debt service on the obligations; and

   (4)  Any proceeds paid under individual policies obtained by issuers of Bonds
        which represent maturing interest on defaulted Bonds held by the Trustee
        will be excludable from Federal gross income if, and to the same extent
        as, such interest would have been excludable if paid in the normal
        course by the issuer of the defaulted Bonds provided that, at the time
        such policies are purchased, the amounts paid for such policies are
        reasonable, customary and consistent with the reasonable expectation
        that the issuer of the Bonds, rather than the insurer, will pay debt
        service on the Bonds.

    Sections 1288 and 1272 of the Code provide a complex set of rules governing
the accrual of original issue discount. These rules provide that original issue
discount accrues either on the basis of a constant compound interest rate or
ratably over the term of the Bond, depending on the date the Bond was issued. In
addition, special rules apply if the purchase price of a Bond exceeds the
original issue price plus the amount of original issue discount which would have
previously accrued based upon its issue price (its "adjusted issue price") to
prior owners. If a Bond is acquired with accrued interest, that portion of the
price paid for the accrued interest is added to the tax basis of the Bond. When
this accrued interest is received, it is treated as a return of capital and
reduces the tax basis of the Bond. If a Bond is purchased for a premium, the
amount of the premium is added to the tax basis of the Bond. Bond premium is
amortized over the remaining term of the Bond, and the tax basis of the Bond is
reduced each tax year by the amount of the premium amortized in that tax year.
The application of these rules will also vary depending on the value of the Bond
on the date a Unitholder acquires his Units and the price the Unitholder pays
for his Units. Unitholders should consult with their tax advisers regarding
these rules and their application.

         "The Revenue Reconciliation Act of 1993" (the "Tax Act") subjects
tax-exempt bonds to the market discount rules of the Code effective for bonds
purchased after April 30, 1993. In general, market discount is the amount (if
any) by which the stated redemption price at maturity exceeds an investor's
purchase price (except to the extent that such difference, if any, is
attributable to original issue discount not yet accrued), subject to a statutory
de minimis rule. Market discount can arise based on the price a Trust pays for
Bonds or the price a Unitholder pays for his or her Units. Under the Tax Act,
accretion of market discount is taxable as ordinary income; under prior law the
accretion had been treated as capital gain. Market discount that accretes while
a Trust holds a Bond would be recognized as ordinary income by the Unitholders
when principal payments are received on the Bond, upon sale or at redemption
(including early redemption), or upon the sale or redemption of his or her
Units, unless a Unitholder elects to include market discount in taxable income
as it accrues. The market discount rules are complex and Unitholders should
consult their tax advisers regarding these rules and their application.

    In the case of certain corporations, the alternative minimum tax and the
Superfund Tax for taxable years beginning after December 31, 1986 depends upon
the corporation's alternative minimum taxable income, which is the corporation's
taxable income with certain adjustments. One of the adjustment items used in
computing the alternative minimum taxable income and the Superfund Tax of a
corporation (other than an S Corporation, Regulated Investment Company, Real
Estate Investment Trust, or REMIC) is an amount equal to 75% of the excess of
such corporation's "adjusted current earnings" over an amount equal to its
alternative minimum taxable income (before such adjustment item and the
alternative tax net operating loss deduction). "Adjusted current earnings"
includes all tax exempt interest, including interest on all of the Bonds in the
Fund. Under current Code provisions, the Superfund Tax does not apply to tax
years beginning on or after January 1, 1996. Legislative proposals have been
introduced which would extend the Superfund Tax. Under the provisions of Section
884 of the Code, a branch profits tax is levied on the "effectively connected
earnings and profits" of certain foreign corporations which include tax-exempt
interest such as interest on the Bonds in the Trust. Unitholders should consult
their tax advisers with respect to the particular tax consequences to them
including the corporate alternative minimum tax, the Superfund Tax and the
branch profits tax imposed by Section 884 of the Code.

    Counsel for the Sponsor has also advised that under Section 265 of the Code,
interest on indebtedness incurred or continued to purchase or carry Units of a
Trust is not deductible for Federal income tax purposes. The Internal Revenue
Service has taken the position that such indebtedness need not be directly
traceable to the purchase or carrying of Units (however, these rules generally
do not apply to interest paid on indebtedness incurred to purchase or improve a
personal residence). Also, under Section 265 of the Code, certain financial
institutions that acquire Units would generally not be able to deduct any of the
interest expense attributable to ownership of such Units. Legislative proposals
have been made that would extend the financial institution rules to all
corporations. Investors with questions regarding these issues should consult
their tax advisers.

    In the case of certain of the Bonds in the Fund, the opinions of bond
counsel indicate that interest on such Bonds received by a "substantial user" of
the facilities being financed with the proceeds of these Bonds, or persons
related thereto, for periods while such Bonds are held by such a user or related
person, will not be excludible from Federal gross income, although interest on
such Bonds received by others would be excludible from Federal gross income.
"Substantial user" and "related person" are defined under the Code and U.S.
Treasury Regulations. Any person who believes that he or she may be a
"substantial user" or a "related person" as so defined should contact his or her
tax adviser.

    In the opinion of special counsel to the Fund for New York tax matters,
under existing law, the Fund and each Trust are not associations taxable as
corporations and the income of each Trust will be treated as the income of the
Unitholders under the income tax laws of the State and City of New York.

    All statements of law in the Prospectus concerning exclusion from gross
income for Federal, state or other tax purposes are the opinions of counsel and
are to be so construed.

    At the respective times of issuance of the Bonds, opinions relating to the
validity thereof and to the exclusion of interest thereon from Federal gross
income are rendered by bond counsel to the respective issuing authorities.
Neither the Sponsor nor Chapman and Cutler has made any special review for the
Fund of the proceedings relating to the issuance of the Bonds or of the basis
for such opinions.

    In the case of corporations, the alternative tax rate applicable to
long-term capital gains is 35%, effective for long-term capital gains realized
in taxable years beginning on or after January 1, 1993. For taxpayers other than
corporations, net capital gains (which are defined as net long-term capital gain
over net short-term capital loss for a taxable year) are subject to a maximum
marginal stated tax rate of 28%. However, it should be noted that legislative
proposals are introduced from time to time that affect tax rates and could
affect relative differences at which ordinary income and capital gains are
taxed. Under the Code, taxpayers must disclose to the Internal Revenue Service
the amount of tax-exempt interest earned during the year. For purposes of
computing the alternative minimum tax for individuals and corporations and the
Superfund Tax for corporations, interest on certain private activity bonds
(which includes most industrial and housing revenue bonds) issued on or after
August 8, 1996 is included as an item of tax preference. Except as otherwise
noted in Prospectus Part I, the Trusts do not include any such private activity
bonds issued on or after that date.

    Section 86 of the Code provides that 50% of Social Security benefits are
includible in gross income to the extent that the sum of "modified adjusted
gross income" plus 50% of the Social Security benefits received exceeds a "base
amount". The base amount is $25,000 for unmarried taxpayers, $32,000 for married
taxpayers filing a joint return and zero for married taxpayers who do not live
apart at all times during the taxable year and who file separate returns.
Modified adjusted gross income is adjusted gross income determined without
regard to certain otherwise allowable deductions and exclusions from gross
income and by including tax-exempt interest. To the extent that Social Security
benefits are includible in gross income, they will be treated as any other item
of gross income.

    In addition, under the Tax Act, for taxable years beginning after December
31, 1993, up to 85% of Social Security benefits are includible in gross income
to the extent that the sum of "modified adjusted gross income" plus 50% of
Social Security benefits received exceeds an "adjusted base amount." The
adjusted base amount is $34,000 for unmarried taxpayers, $44,000 for married
taxpayers filing a joint return, and zero for married taxpayers who do not live
apart at all times during the taxable year and who file separate returns.

    Although tax-exempt interest is included in modified adjusted gross income
solely for the purpose of determining what portion, if any, of Social Security
benefits will be included in gross income, no tax-exempt interest, including
that received from a Trust, will be subject to tax. A taxpayer whose adjusted
gross income already exceeds the base amount or the adjusted base amount must
include 50% or 85%, respectively, of his Social Security benefits in gross
income whether or not he receives any tax-exempt interest. A taxpayer whose
modified adjusted gross income (after inclusion of tax-exempt interest) does not
exceed the base amount need not include any Social Security benefits in gross
income.

    Ownership of the Units may result in collateral federal income tax
consequences to certain taxpayers, including, without limitation, corporations
subject to either the environmental tax or the branch profits tax, financial
institutions, certain insurance companies, certain S corporations, individual
recipients of Social Security or Railroad Retirement benefits and taxpayers who
may be deemed to have incurred (or continued) indebtedness to purchase or carry
tax-exempt obligations. Prospective investors should consult their tax advisors
as to the applicability of any collateral consequences.

    For a discussion of the state tax status of income earned on Units of a
Trust and recent changes in Federal tax law, see Prospectus Part I. Except as
noted therein, the exemption of interest on state and local obligations for
Federal income tax purposes discussed above does not necessarily result in
exemption under the income or other tax laws of any state or city. The laws of
the several states vary with respect to the taxation of such obligations.

EXPENSES
- -------------------------------------------------------------------------------

    The Sponsor will not receive any fees in connection with its activities
relating to the Fund. However, American Portfolio Evaluation Services, a
division of Van Kampen American Capital Investment Advisory Corp., which is an
affiliate of the Sponsor, will receive the annual supervisory fee indicated
under "Summary of Essential Financial Information" in Prospectus Part I for
providing portfolio supervisory services for the Fund. In addition, the
Evaluator will receive the annual evaluation fee indicated under "Summary of
Essential Financial Information" in Prospectus Part I for evaluating each
Trust's portfolio. These fees may exceed the actual costs of providing these
services for a Trust but the total amount received by the Evaluator for
providing these services to all Van Kampen American Capital unit investment
trusts will not exceed the total cost of providing the services in any calendar
year. For its services the Trustee will receive the fee indicated under "Summary
of Essential Financial Information" in Prospectus Part I (which may be reduced
as described therein). Part of the Trustee's compensation for its services is
expected to result from the use of the funds being held in the Principal and
Interest Accounts for future distributions, payment of expenses and redemptions
since these Accounts are non-interest bearing to Unitholders. These fees are
based on the outstanding principal amount of Bonds and Units on the Date of
Deposit for the first year and as of the close of business on January 1 for each
year thereafter.

    Premiums for any portfolio insurance are obligations of each Insured
Trust and are payable monthly by the Trustee on behalf of the Trust. As Bonds in
an Insured Trust are redeemed by their respective issuers or are sold by the
Trustee, the amount of the premium will be reduced in respect of those Bonds. If
the Trustee exercises the right to obtain permanent insurance, the premiums
payable for such permanent insurance will be paid solely from the proceeds of
the sale of the related Bonds.

    The following additional charges are or may be incurred by the Trusts: (a)
fees of the Trustee for extraordinary services, (b) expenses of the Trustee
(including legal and auditing expenses) and of counsel designated by the
Sponsor, (c) various governmental charges, (d) expenses and costs of any action
taken by the Trustee to protect the Trusts and the rights and interests of
Unitholders, (e) indemnification of the Trustee for any loss, liability or
expenses incurred by it in the administration of the Fund without negligence,
bad faith or willful misconduct on its part, (f) any special custodial fees
payable in connection with the sale of any of the Bonds in a Trust, (g)
expenditures incurred in contacting Unitholders upon termination of the Trusts
and (h) costs incurred to reimburse the Trustee for advancing funds to the
Trusts to meet scheduled distributions (which costs may be adjusted periodically
in response to fluctuations in short-term interest rates). The fees and expenses
set forth herein are payable out of the Trusts. When such fees and expenses are
paid by or owing to the Trustee, they are secured by a lien on the portfolio of
the applicable Trust. If the balances in the Interest and Principal Accounts are
insufficient to provide for amounts payable by a Trust, the Trustee has the
power to sell Bonds to pay such amounts.

    On or before the twenty-fifth day of each month, the Trustee will deduct
from the Interest Account and, to the extent funds are not sufficient therein,
from the Principal Account, amounts necessary to pay the expenses of the Fund.
The Trustee also may withdraw from these Accounts such amounts, if any, as it
deems necessary to establish a reserve for any governmental charges payable out
of the Fund. Amounts so withdrawn shall not be considered a part of the Fund's
assets until such time as the Trustee shall return all or any part of such
amounts to the appropriate Accounts. All costs and expenses incurred in creating
and establishing the Fund, including the cost of the initial preparation,
printing and execution of the Trust Agreement and the certificates, legal and
accounting expenses, advertising and selling expenses, expenses of the Trustee,
initial evaluation fees and other out-of-pocket expenses have been borne by the
Sponsor at no cost to the Fund.

ADDITIONAL INFORMATION
- -------------------------------------------------------------------------------

    This Prospectus does not contain all the information set forth in the
Registration Statement filed by the Fund with the SEC. The Information
Supplement, which has been filed with the SEC, includes more detailed
information concerning the Bonds, investment risks and general information about
the Fund. This Prospectus incorporates by reference the entire Information
Supplement. The Information Supplement may be obtained by contacting the Trustee
or is available along with other related materials at the SEC's Internet site
(http://www.sec.gov).

OTHER MATTERS
- -------------------------------------------------------------------------------

    LEGAL MATTERS. The legality of the Units offered hereby and certain matters
relating to Federal tax law have been passed upon by Chapman and Cutler, 111
West Monroe Street, Chicago, Illinois 60603, as counsel for the Sponsor. Winston
& Strawn has acted as counsel to the Trustee and Special counsel to the Fund for
New York tax matters. Special counsel to the Fund for certain state tax matters
are named under "Tax Status" appearing in Prospectus Part I.

    INDEPENDENT CERTIFIED PUBLIC ACCOUNTANTS. The statement of condition and the
related portfolio at the Date of Deposit included in Prospectus Part I have been
audited by Grant Thornton LLP, independent certified public accountants, as set
forth in their report in Prospectus Part I, and are included herein in reliance
upon the authority of said firm as experts in accounting and auditing.

                                TABLE OF CONTENTS
                  TITLE                                    PAGE
          The Trusts                                         2
             The Fund                                        2
             Objectives and Bond Selection                   2
             Risk Factors                                    3
          Estimated Current and Long-Term Returns            5
          Public Offering                                    6
             General                                         6
             Offering Price                                  7
             Accrued Interest                                8
             Unit Distribution                               8
             Sponsor and Underwriter Compensation            9
             Market for Units                               10
          Rights of Unitholders                             11
             Distributions of Interest and Principal        11
             Reinvestment Option                            11
             Redemption of Units                            11
             Certificates                                   12
             Reports Provided                               12
          Insurance on the Bonds in the Insured Trusts      13
          Fund Administration                               14
             Sponsor                                        14
             Trustee                                        14
             Portfolio Administration                       14
             Replacement Bonds                              15
             Amendment of Trust Agreement                   15
             Termination of Trust Agreement                 15
             Limitation on Liabilities                      15
          Federal Tax Status                                16
          Expenses                                          18
          Additional Information                            19
          Other Matters                                     19
             Legal Matters                                  19
             Independent Certified Public Accountants       19

- ------------
   No person is authorized to give any information or to make any
representations not contained in this Prospectus; and any information or
representation not contained herein must not be relied upon as having been
authorized by the Fund, the Sponsor or the Underwriters. This Prospectus does
not constitute an offer to sell, or a solicitation of an offer to buy,
securities in any state to any person to whom it is not lawful to make such
offer in such state.

   This Prospectus contains information concerning the Fund and the Sponsor, but
does not contain all of the information set forth in the registration statements
and exhibits relating thereto, which the Fund has filed with the Securities and
Exchange Commission, Washington, D.C., under the Securities Act of 1933 and the
Investment Company Act of 1940, and to which reference is hereby made.

                               PROSPECTUS PART II

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                                  FEBRUARY 1998

              INSURED MUNICIPALS INCOME TRUST, INSURED MULTI-SERIES

                                       AND

                         INSURED MUNICIPALS INCOME TRUST
             AND INVESTORS' QUALITY TAX-EXEMPT TRUST, MULTI-SERIES

          ------ A Wealth of Knowledge o Knowledge of Wealth(sm) ------
                           VAN KAMPEN AMERICAN CAPITAL

                               One Parkview Plaza
                        Oakbrook Terrace, Illinois 60181

                             2800 Post Oak Boulevard
                              Houston, Texas 77056

                                   Van Kampen

                             Information Supplement

Insured Municipals Income Trust, 233rd Insured Multi-Series

- --------------------------------------------------------------------------------
   This Information Supplement provides additional information concerning the
risks and operations of the Fund which is not described in the Prospectus for
the Fund. This Information Supplement should be read in conjunction with the
Fund's prospectus. This Information Supplement is not a prospectus (but is
incorporated into the Prospectus by reference), does not include all of the
information that an investor should consider before investing in a Trust and may
not be used to offer or sell Units without the Prospectus. Copies of the
Prospectus can be obtained by contacting the Sponsor at One Parkview Plaza,
Oakbrook Terrace, Illinois 60181 or by contacting your broker. This Information
Supplement is dated as of the date of Prospectus Part I and all capitalized
terms have been defined in the Prospectus.

                                Table of Contents

                                                                            Page
   Municipal Bond Risk Factors............................................    2
   Insurance on the Bonds in the Insured Trusts...........................    6
   Portfolio Administration...............................................   12
   Trustee Information....................................................   13
   Termination of the Trust Agreement.....................................   14
   Description of Ratings.................................................   14
   Equivalent Taxable Estimated Current Return Tables.....................   16
   California Risk Factors................................................   18
   Michigan Risk Factors..................................................   24
   New Jersey.............................................................   25
   Estimated Cash Flows to Unitholders....................................   29

                           MUNICIPAL BOND RISK FACTORS

   The Trusts include certain types of bonds described below. Accordingly, an
investment in a Trust should be made with an understanding of the
characteristics of and risks associated with such bonds. The types of bonds
included in each Trust are described on the cover of the related Prospectus Part
I. Neither the Sponsor nor the Trustee shall be liable in any way for any
default, failure or defect in any of the Bonds.

   Certain of the Bonds may be general obligations of a governmental entity that
are backed by the taxing power of such entity. All other Bonds in the Trusts are
revenue bonds payable from the income of a specific project or authority and are
not supported by the issuer's power to levy taxes. General obligation bonds are
secured by the issuer's pledge of its faith, credit and taxing power for the
payment of principal and interest. Revenue bonds, on the other hand, are payable
only from the revenues derived from a particular facility or class of facilities
or, in some cases, from the proceeds of a special excise tax or other specific
revenue source. There are, of course, variations in the security of the
different Bonds in the Fund, both within a particular classification and between
classifications, depending on numerous factors.

   Certain of the Bonds may be obligations which derive their payments from
mortgage loans. Certain of such housing bonds may be FHA insured or may be
single family mortgage revenue bonds issued for the purpose of acquiring from
originating financial institutions notes secured by mortgages on residences
located within the issuer's boundaries and owned by persons of low or moderate
income. Mortgage loans are generally partially or completely prepaid prior to
their final maturities as a result of events such as sale of the mortgaged
premises, default, condemnation or casualty loss. Because these bonds are
subject to extraordinary mandatory redemption in whole or in part from such
prepayments of mortgage loans, a substantial portion of such bonds will probably
be redeemed prior to their scheduled maturities or even prior to their ordinary
call dates. Extraordinary mandatory redemption without premium could also result
from the failure of the originating financial institutions to make mortgage
loans in sufficient amounts within a specified time period. Additionally,
unusually high rates of default on the underlying mortgage loans may reduce
revenues available for the payment of principal of or interest on such mortgage
revenue bonds. These bonds were issued under Section 103A of the Internal
Revenue Code, which Section contains certain requirements relating to the use of
the proceeds of such bonds in order for the interest on such bonds to retain its
tax-exempt status. In each case the issuer of the bonds has covenanted to comply
with applicable requirements and bond counsel to such issuer has issued an
opinion that the interest on the bonds is exempt from Federal income tax under
existing laws and regulations. Certain issuers of housing bonds have considered
various ways to redeem bonds they have issued prior to the stated first
redemption dates for such bonds. In connection with the housing bonds held by
the Fund, the Sponsor at the Date of Deposit is not aware that any of the
respective issuers of such bonds are actively considering the redemption of such
bonds prior to their respective stated initial call dates.

   Certain of the Bonds may be health care revenue bonds. Ratings of bonds
issued for health care facilities are often based on feasibility studies that
contain projections of occupancy levels, revenues and expenses. A facility's
gross receipts and net income available for debt service may be affected by
future events and conditions including, among other things, demand for services
and the ability of the facility to provide the services required, physicians'
confidence in the facility, management capabilities, competition with other
health care facilities, efforts by insurers and governmental agencies to limit
rates, legislation establishing state rate-setting agencies, expenses, the cost
and possible unavailability of malpractice insurance, the funding of Medicare,
Medicaid and other similar third party payor programs, government regulation and
the termination or restriction of governmental financial assistance, including
that associated with Medicare, Medicaid and other similar third party payor
programs.

   Certain of the Bonds may be obligations of public utility issuers, including
those selling wholesale and retail electric power and gas. General problems of
such issuers would include the difficulty in financing large construction
programs in an inflationary period, the limitations on operations and increased
costs and delays attributable to environmental considerations, the difficulty of
the capital market in absorbing utility debt, the difficulty in obtaining fuel
at reasonable prices and the effect of energy conservation. In addition,
Federal, state and municipal governmental authorities may from time to time
review existing, and impose additional, regulations governing the licensing,
construction and operation of nuclear power plants, which may adversely affect
the ability of the issuers of certain of the Bonds to make payments of principal
and/or interest on such Bonds.

   Certain of the Bonds may be obligations of issuers whose revenues are derived
from the sale of water and/or sewerage services. Such bonds are generally
payable from user fees. The problems of such issuers include the ability to
obtain timely and adequate rate increases, population decline resulting in
decreased user fees, the difficulty of financing large construction programs,
the limitations on operations and increased costs and delays attributable to
environmental considerations, the increasing difficulty of obtaining or
discovering new supplies of fresh water, the effect of conservation programs and
the impact of "no-growth" zoning ordinances.

   Certain of the Bonds may be industrial revenue bonds ("IRBs"). IRBs have
generally been issued under bond resolutions pursuant to which the revenues and
receipts payable under the arrangements with the operator of a particular
project have been assigned and pledged to purchasers. In some cases, a mortgage
on the underlying project may have been granted as security for the IRBs.
Regardless of the structure, payment of IRBs is solely dependent upon the
creditworthiness of the corporate operator of the project or corporate
guarantor. Corporate operators or guarantors may be affected by many factors
which may have an adverse impact on the credit quality of the particular company
or industry. These include cyclicality of revenues and earnings, regulatory and
environmental restrictions, litigation resulting from accidents or
environmentally-caused illnesses, extensive competition and financial
deterioration resulting from a corporate restructuring pursuant to a leveraged
buy-out, takeover or otherwise. Such a restructuring may result in the operator
of a project becoming highly leveraged which may impact on such operator's
creditworthiness which in turn would have an adverse impact on the rating and/or
market value of such bonds. Further, the possibility of such a restructuring may
have an adverse impact on the market for and consequently the value of such
bonds, even though no actual takeover or other action is ever contemplated or
effected.

   Certain of the Bonds may be obligations that are secured by lease payments of
a governmental entity (hereinafter called "lease obligations"). Lease
obligations are often in the form of certificates of participation. Although the
lease obligations do not constitute general obligations of the municipality for
which the municipality's taxing power is pledged, a lease obligation is
ordinarily backed by the municipality's covenant to appropriate for and make the
payments due under the lease obligation. However, certain lease obligations
contain "non-appropriation" clauses which provide that the municipality has no
obligation to make lease payments in future years unless money is appropriated
for such purpose on a yearly basis. A governmental entity that enters into such
a lease agreement cannot obligate future governments to appropriate for and make
lease payments but covenants to take such action as is necessary to include any
lease payments due in its budgets and to make the appropriations therefor. A
governmental entity's failure to appropriate for and to make payments under its
lease obligation could result in insufficient funds available for payment of the
obligations secured thereby. Although "non-appropriation" lease obligations are
secured by the leased property, disposition of the property in the event of
foreclosure might prove difficult.

   Certain of the Bonds may be obligations of issuers which are, or which govern
the operation of, schools, colleges and universities and whose revenues are
derived mainly from ad valorem taxes or for higher education systems, from
tuition, dormitory revenues, grants and endowments. General problems relating to
school bonds include litigation contesting the state constitutionality of
financing public education in part from ad valorem taxes, thereby creating a
disparity in educational funds available to schools in wealthy areas and schools
in poor areas. Litigation or legislation on this issue may affect the sources of
funds available for the payment of school bonds in the Trusts. General problems
relating to college and university obligations include the prospect of a
declining percentage of the population consisting of "college" age individuals,
possible inability to raise tuitions and fees sufficiently to cover increased
operating costs, the uncertainty of continued receipt of Federal grants and
state funding, and government legislation or regulations which may adversely
affect the revenues or costs of such issuers.

   Certain of the Bonds in certain of the Trusts may be obligations which are
payable from and secured by revenues derived from the ownership and operation of
facilities such as airports, bridges, turnpikes, port authorities, convention
centers and arenas. The major portion of an airport's gross operating income is
generally derived from fees received from signatory airlines pursuant to use
agreements which consist of annual payments for leases, occupancy of certain
terminal space and service fees. Airport operating income may therefore be
affected by the ability of the airlines to meet their obligations under the use
agreements. From time to time the air transport industry has experienced
significant variations in earnings and traffic, due to increased competition,
excess capacity, increased costs, deregulation, traffic constraints and other
factors, and several airlines have experienced severe financial difficulties.
Similarly, payment on bonds related to other facilities is dependent on revenues
from the projects, such as user fees from ports, tolls on turnpikes and bridges
and rents from buildings. Therefore, payment may be adversely affected by
reduction in revenues due to such factors as increased cost of maintenance,
decreased use of a facility, lower cost of alternative modes of transportation,
scarcity of fuel and reduction or loss of rents.

   Certain of the Bonds may be obligations which are payable from and secured by
revenues derived from the operation of resource recovery facilities. Resource
recovery facilities are designed to process solid waste, generate steam and
convert steam to electricity. Resource recovery bonds may be subject to
extraordinary optional redemption at par upon the occurrence of certain
circumstances, including but not limited to: destruction or condemnation of a
project; contracts relating to a project becoming void, unenforceable or
impossible to perform; changes in the economic availability of raw materials,
operating supplies or facilities necessary for the operation of a project or
technological or other unavoidable changes adversely affecting the operation of
a project; and administrative or judicial actions which render contracts
relating to the projects void, unenforceable or impossible to perform or impose
unreasonable burdens or excessive liabilities. The Sponsor cannot predict the
causes or likelihood of the redemption of resource recovery bonds in a Trust
prior to the stated maturity of the Bonds.

   Certain of the Bonds may have been acquired at a market discount from par
value at maturity. The coupon interest rates on discount bonds at the time they
were purchased and deposited in a Trust were lower than the current market
interest rates for newly issued bonds of comparable rating and type. If such
interest rates for newly issued comparable bonds increase, the market discount
of previously issued bonds will become greater, and if such interest rates for
newly issued comparable bonds decline, the market discount of previously issued
bonds will be reduced, other things being equal. Investors should also note that
the value of bonds purchased at a market discount will increase in value faster
than bonds purchased at a market premium if interest rates decrease. Conversely,
if interest rates increase, the value of bonds purchased at a market discount
will decrease faster than bonds purchased at a market premium. In addition, if
interest rates rise, the prepayment risk of higher yielding, premium Securities
and the prepayment benefit for lower yielding, discount bonds will be reduced. A
bond purchased at a market discount and held to maturity will have a larger
portion of its total return in the form of taxable income and capital gain and
less in the form of tax-exempt interest income than a comparable bond newly
issued at current market rates. See "Federal Tax Status" in Prospectus Part II.
Market discount attributable to interest changes does not indicate a lack of
market confidence in the issue.

   Certain of the Bonds may be "zero coupon" bonds. Zero coupon bonds are
purchased at a deep discount because the buyer receives only the right to
receive a final payment at the maturity of the bond and does not receive any
periodic interest payments. The effect of owning deep discount bonds which do
not make current interest payments (such as the zero coupon bonds) is that a
fixed yield is earned not only on the original investment but also, in effect,
on all discount earned during the life of such obligation. This implicit
reinvestment of earnings at the same rate eliminates the risk of being unable to
reinvest the income on such obligation at a rate as high as the implicit yield
on the discount obligation, but at the same time eliminates the holder's ability
to reinvest at higher rates in the future. For this reason, zero coupon bonds
are subject to substantially greater price fluctuations during periods of
changing market interest rates than are securities of comparable quality which
pay interest.

   Certain of the Bonds may have been purchased on a "when, as and if issued" or
"delayed delivery" basis. See "Notes to Portfolio" in Prospectus Part I. The
delivery of any such Bonds may be delayed or may not occur. Interest on these
Bonds begins accruing to the benefit of Unitholders on their respective dates of
delivery. To the extent any Bonds are actually delivered to the Fund after their
respective expected dates of delivery, Unitholders who purchase their Units
prior to the date such Bonds are actually delivered to the Trustee would be
required to adjust their tax basis in their Units for a portion of the interest
accruing on such Bonds during the interval between their purchase of Units and
the actual delivery of such Bonds. As a result of any such adjustment, the
Estimated Current Returns during the first year would be slightly lower than
those stated in the Prospectus which would be the returns after the first year,
assuming the portfolio of a Trust and estimated annual expenses other than that
of the Trustee (which may be reduced in the first year only) do not vary from
that set forth in Prospectus Part I. Unitholders will be "at risk" with respect
to all Bonds in the portfolios including "when, as and if issued" and "delayed
delivery" Bonds (i.e., may derive either gain or loss from fluctuations in the
evaluation of such Bonds) from the date they commit for Units.

   Certain of the Bonds may be subject to redemption prior to their stated
maturity date pursuant to sinking fund provisions, call provisions or
extraordinary optional or mandatory redemption provisions or otherwise. A
sinking fund is a reserve fund accumulated over a period of time for retirement
of debt. A callable debt obligation is one which is subject to redemption or
refunding prior to maturity at the option of the issuer. A refunding is a method
by which a debt obligation is redeemed, at or before maturity, by the proceeds
of a new debt obligation. In general, call provisions are more likely to be
exercised when the offering side valuation is at a premium over par than when it
is at a discount from par. The exercise of redemption or call provisions will
(except to the extent the proceeds of the called bonds are used to pay for Unit
redemptions) result in the distribution of principal and may result in a
reduction in the amount of subsequent interest distributions; it may also affect
the current return on Units of the Trust involved. Each Trust portfolio contains
a listing of the sinking fund and call provisions, if any, with respect to each
of the debt obligations. Extraordinary optional redemptions and mandatory
redemptions result from the happening of certain events. Generally, events that
may permit the extraordinary optional redemption of bonds or may require the
mandatory redemption of bonds include, among others: a final determination that
the interest on the bonds is taxable; the substantial damage or destruction by
fire or other casualty of the project for which the proceeds of the bonds were
used; an exercise by a local, state or Federal governmental unit of its power of
eminent domain to take all or substantially all of the project for which the
proceeds of the bonds were used; changes in the economic availability of raw
materials, operating supplies or facilities or technological or other changes
which render the operation of the project for which the proceeds of the bonds
were used uneconomic; changes in law or an administrative or judicial decree
which renders the performance of the agreement under which the proceeds of the
bonds were made available to finance the project impossible or which creates
unreasonable burdens or which imposes excessive liabilities, such as taxes, not
imposed on the date the bonds are issued on the issuer of the bonds or the user
of the proceeds of the bonds; an administrative or judicial decree which
requires the cessation of a substantial part of the operations of the project
financed with the proceeds of the bonds; an overestimate of the costs of the
project to be financed with the proceeds of the bonds resulting in excess
proceeds of the bonds which may be applied to redeem bonds; or an underestimate
of a source of funds securing the bonds resulting in excess funds which may be
applied to redeem bonds. The issuer of certain bonds in a Trust may have sold or
reserved the right to sell, upon the satisfaction of certain conditions, to
third parties all or any portion of its rights to call bonds in accordance with
the stated redemption provisions of such bonds. In such a case the issuer no
longer has the right to call the bonds for redemption unless it reacquires the
rights from such third party. A third party pursuant to these rights may
exercise the redemption provisions with respect to a bond at a time when the
issuer of the bond might not have called a bond for redemption had it not sold
such rights. The Sponsor is unable to predict all of the circumstances which may
result in such redemption of an issue of Bonds. See also the discussion of
single family mortgage and multi-family revenue bonds above for more information
on the call provisions of such bonds.

   To the best knowledge of the Sponsor, there is no litigation pending as of
the Date of Deposit in respect of any Bonds which might reasonably be expected
to have a material adverse effect upon the Fund or any of the Trusts. At any
time after the Date of Deposit, litigation may be initiated on a variety of
grounds with respect to Bonds in the Fund. Such litigation, as, for example,
suits challenging the issuance of pollution control revenue bonds under
environmental protection statutes, may affect the validity of such Bonds or the
tax-free nature of the interest thereon. While the outcome of litigation of such
nature can never be entirely predicted, the Fund has received or will receive
opinions of bond counsel to the issuing authorities of each Bond on the date of
issuance to the effect that such Bonds have been validly issued and that the
interest thereon is exempt from Federal income tax. In addition, other factors
may arise from time to time which potentially may impair the ability of issuers
to meet obligations undertaken with respect to the Bonds.

                  INSURANCE ON THE BONDS IN THE INSURED TRUSTS

   Insurance has been obtained by each Insured Trust, by the issuer of Bonds in
an Insured Trust, by a prior owner of such Bonds, or by the Sponsor prior to the
deposit of such Bonds in a Trust guaranteeing prompt payment of interest and
principal, when due, in respect of the bonds in such Trust. See Settlement of
Bonds in "The Trusts--Objectives and Bond Selection" in Prospectus Part II. The
Portfolio Insurers and the Preinsured Bond Insurers are described under
"Portfolio" and "Notes to Portfolio" in Prospectus Part I. The Portfolio
Insurers are either AMBAC Assurance Corporation or Financial Guaranty Insurance
Company. An insurance policy obtained by an Insured Trust, if any, is
non-cancellable and will continue in force so long as such Trust is in
existence, the respective Portfolio Insurer is still in business and the Bonds
described in such policy continue to be held by such Trust (see "Portfolio" for
the respective Insured Trust in Prospectus Part I). Any portfolio insurance
premium for an Insured Trust, which is an obligation of such Trust, is paid by
such Trust on a monthly basis. Non-payment of premiums on a policy obtained by
an Insured Trust will not result in the cancellation of insurance but will force
the insurer to take action against the Trustee to recover premium payments due
it. The Trustee in turn will be entitled to recover such payments from such
Trust. Premium rates for each issue of Bonds protected by a policy obtained by
an Insured Trust, if any, are fixed for the life of the Trust. The premium for
any Preinsured Bond insurance has been paid by such issuer, by a prior owner of
such Bonds or the Sponsor and any such policy or policies are non-cancellable
and will continue in force so long as the Bonds so insured are outstanding and
the respective Preinsured Bond Insurer remains in business. If the provider of
an original issuance insurance policy is unable to meet its obligations under
such policy or if the rating assigned to the claims-paying ability of any such
insurer deteriorates, the Portfolio Insurers have no obligation to insure any
issue adversely affected by either of the above described events.

   The aforementioned portfolio insurance obtained by an Insured Trust, if any,
guarantees the timely payment of principal and interest on the Bonds when they
fall due. For the purposes of insurance obtained by an Insured Trust, "when due"
generally means the stated payment or maturity date for the payment of principal
and interest. However, in the event (a) an issuer of a Bond defaults in the
payment of principal or interest on such Bond, (b) such issuer enters into a
bankruptcy proceeding or (c) the maturity of such Bond is accelerated, the
affected Portfolio Insurer has the option, in its sole discretion, after
receiving notice of the earliest to occur of such a default, bankruptcy
proceeding or acceleration to pay the outstanding principal amount of such Bond
plus accrued interest to the date of such payment and thereby retire the Bond
from the affected Trust prior to such Bond's stated maturity date. The insurance
does not guarantee the market value of the Bonds or the value of the Units.
Insurance obtained by an Insured Trust, if any, is only effective as to Bonds
owned by and held in such Trust. In the event of a sale of any such Bond by the
Trustee, such insurance terminates as to such Bond on the date of sale.

   Pursuant to an irrevocable commitment of the Portfolio Insurers, the Trustee,
upon the sale of a Bond covered under a portfolio insurance policy obtained by
an Insured Trust, has the right to obtain permanent insurance with respect to
such Bond (i.e., insurance to maturity of the Bond regardless of the identity of
the holder thereof) (the "Permanent Insurance") upon the payment of a single
predetermined insurance premium and any expenses related thereto from the
proceeds of the sale of such Bond. Accordingly, any Bond in an Insured Trust is
eligible to be sold on an insured basis. It is expected that the Trustee would
exercise the right to obtain Permanent Insurance only if upon such exercise the
affected Trust would receive net proceeds (sale of Bond proceeds less the
insurance premium and related expenses attributable to the Permanent Insurance)
from such sale in excess of the sale proceeds if such Bonds were sold on an
uninsured basis. The insurance premium with respect to each Bond eligible for
Permanent Insurance would be determined based upon the insurability of each Bond
as of the Date of Deposit and would not be increased or decreased for any change
in the creditworthiness of each Bond.

   The Sponsor believes that the Permanent Insurance option provides an
advantage to an Insured Trust in that each Bond insured by a Trust insurance
policy may be sold out of the affected Trust with the benefits of the insurance
attaching thereto. Thus, the value of the insurance, if any, at the time of
sale, can be realized in the market value of the Bond so sold (which is not the
case in connection with any value attributable to an Insured Trust's portfolio
insurance). See Public Offering--Offering Price" in Prospectus Part II. Because
any such insurance value may be realized in the market value of the Bond upon
the sale thereof upon exercise of the Permanent Insurance option, the Sponsor
anticipates that (a) in the event an Insured Trust were to be comprised of a
substantial percentage of Bonds in default or significant risk of default, it is
much less likely that such Trust would need at some point in time to seek a
suspension of redemptions of Units than if such Trust were to have no such
option (see "Rights of Unitholders--Redemption of Units" in Prospectus Part II)
and (b) at the time of termination of an Insured Trust, if such Trust were
holding defaulted Bonds or Bonds in significant risk of default such Trust would
not need to hold such Securities until their respective maturities in order to
realize the benefits of such Trust's portfolio insurance (see "Fund
Administration--Termination of Trust Agreement" in Prospectus Part II).

   Except as indicated below, insurance obtained by an Insured Trust has no
effect on the price or redemption value of Units. It is the present intention of
the Evaluator to attribute a value for such insurance (including the right to
obtain Permanent Insurance) for the purpose of computing the price or redemption
value of Units if the Bonds covered by such insurance are in default in payment
of principal or interest or in significant risk of such default. The value of
the insurance will be the difference between (i) the market value of a bond
which is in default in payment of principal or interest or in significant risk
of such default assuming the exercise of the right to obtain Permanent Insurance
(less the insurance premium and related expenses attributable to the purchase of
Permanent Insurance) and (ii) the market value of such Bonds not covered by
Permanent Insurance. See "Public Offering--Offering Price" in Prospectus Part
II. It is also the present intention of the Trustee not to sell such Bonds to
effect redemptions or for any other reason but rather to retain them in the
portfolio because value attributable to the insurance cannot be realized upon
sale. See "Public Offering--Offering Price" in Prospectus Part II for a more
complete description of an Insured Trust's method of valuing defaulted Bonds and
Bonds which have a significant risk of default. Insurance obtained by the issuer
of a Bond is effective so long as such Bond is outstanding. Therefore, any such
insurance may be considered to represent an element of market value in regard to
the Bonds thus insured, but the exact effect, if any, of this insurance on such
market value cannot be predicted.

   The portfolio insurance policy or policies obtained by an Insured Trust, if
any, with respect to the Bonds in such Trust were issued by one or more of the
Portfolio Insurers. Any other Preinsured Bond insurance policy (or commitment
therefor) was issued by one of the Preinsured Bond Insurers. See "The
Trusts--Objectives and Bond Selection" in Prospectus Part II.

    Capital Markets Assurance Corporation ("CapMAC") is a New York-domiciled
monoline stock insurance company which engages only in the business of financial
guaranty and surety insurance. CapMAC is licensed in all 50 states in addition
to the District of Columbia, the Commonwealth of Puerto Rico and the territory
of Guam. CapMAC insures structured asset-backed, corporate, municipal and other
financial obligations in the U.S. and international capital markets. CapMAC also
provides financial guarantee reinsurance for structured asset-backed, corporate,
municipal and other financial obligations written by other major insurance
companies.

    CapMAC's claims-paying ability is rated "Aaa" by Moody's Investors Service,
Inc. ("Moody's"), "AAA" by Standard & Poor's, "AAA" by Duff & Phelps Credit
Rating Co. ("Duff & Phelps") and "AAA" by Nippon Investors Service, Inc. Such
ratings reflect only the views of the respective rating agencies, are not
recommendations to buy, sell or hold securities and are subject to revision or
withdrawal at any time by such rating agencies.

    Pursuant to a merger of a subsidiary of MBIA Inc. with and into CapMAC
Holdings Inc., CapMAC became an indirect wholly-owned subsidiary of MBIA Inc. on
February 17, 1998. MBIA Inc., through its wholly-owned subsidiary, MBIA
Insurance Corporation, is a financial guaranty insurer of municipal bonds and
structured finance transactions. MBIA Insurance Corporation has a claims paying
rating of triple-A from Moody's Investor Service, Inc., Standard & Poor's
Ratings Services and Fitch IBCA, Inc. (formerly Fitch Investors Service, L.P.).
Pursuant to a reinsurance agreement, it is anticipated that CapMAC will cede all
of its net insured risks, as well as its unearned premiums and contingency
reserves, to MBIA Insurance Corporation and that MBIA Insurance Corporation will
reinsure CapMAC's net outstanding exposure. Neither MBIA Inc. nor any of its
stockholders is obligated to pay any claims under any policy issued by CapMAC or
any debts of CapMAC or to make additional capital contributions to CapMAC.

    CapMAC is regulated by the Superintendent of Insurance of the State of New
York. In addition, CapMAC is subject to regulation by the insurance laws and
regulations of the other jurisdictions in which it is licensed. Such insurance
laws regulate, among other things, the amount of net exposure per risk that
CapMAC may retain, capital transfers, dividends, investment of assets, changes
in control, transactions with affiliates and consolidations and acquisitions.
CapMAC is subject to periodic regulatory examinations by the same regulatory
authorities.

    CapMAC's obligations under the Policy(s) may be reinsured. Such reinsurance
does not relieve CapMAC of any of its obligations under the Policy(s).

    THE POLICY IS NOT COVERED BY THE PROPERTY/CASUALTY INSURANCE SECURITY FUND
SPECIFIED IN ARTICLE 76 OF THE NEW YORK INSURANCE LAW.

    As of December 31, 1995 and 1996, CapMAC had qualified statutory capital
(which consists of policyholders' surplus, statutory capital, and contingency
reserves) of approximately $260 million and $240 million, respectively, and had
not incurred any debt obligations. As of September 30, 1997, CapMAC had
qualified statutory capital of $278.6 million and had not incurred any debt
obligations. Article 69 of the New York State Insurance Law requires CapMAC to
establish and maintain the contingency reserve, which is available to cover 
claims under policies issued by CapMAC.

    Copies of CapMAC's financial statements prepared in accordance with
statutory accounting standards, which differ from generally accepted accounting
principles, are filed with the Insurance Department of the State of New York and
are available upon request. CapMAC is located at 885 Third Avenue, New York, New
York 10022, and its telephone is (212) 755-1155.

    Effective July 14, 1997, AMBAC Indemnity Corporation changed its name to
AMBAC Assurance Corporation ("AMBAC Assurance"). AMBAC Assurance is a
Wisconsin-domiciled stock insurance corporation regulated by the Office of the
Commissioner of Insurance of the State of Wisconsin and licensed to do business
in 50 states, the District of Columbia and the Commonwealth of Puerto Rico, with
admitted assets of approximately $2,967,246,831 (unaudited) and statutory
capital of approximately $1,715,481,691 (unaudited) as of March 31, 1998.
Statutory capital consists of AMBAC Assurance's policyholders' surplus and
statutory contingency reserve. AMBAC Assurance is a wholly owned subsidiary of
AMBAC Financial Group, Inc., a 100% publicly-held company. Moody's Investors
Service, Inc. and Standard & Poor's have both assigned a triple-A claims-paying
ability rating to AMBAC Assurance.

    Copies of its financial statements prepared in accordance with statutory
accounting standards are available from AMBAC Assurance. The address of AMBAC
Assurance's administrative offices and its telephone number are One State Street
Plaza, 17th Floor, New York, New York, 10004 and (212) 668-0340.

    AMBAC Assurance has entered into quota share reinsurance agreements under
which a percentage of the insurance underwritten pursuant to certain municipal
bond insurance programs of AMBAC Assurance has been and will be assumed by a
number of foreign and domestic unaffiliated reinsurers.

    MBIA Insurance Corporation ("MBIA") is the principal operating subsidiary of
MBIA Inc., a New York Stock Exchange listed company. MBIA Inc. is not obligated
to pay the debts of or claims against MBIA. MBIA is domiciled in the State of
New York and licensed to do business in and subject to regulation under the laws
of all fifty states, the District of Columbia, the Commonwealth of the Northern
Mariana Islands, the Commonwealth of Puerto Rico, the Virgin Islands of the
United States and the Territory of Guam. MBIA has two European branches, one in
the Republic of France and the other in the Kingdom of Spain. New York has laws
prescribing minimum capital requirements, limiting classes and concentrations of
investments and requiring the approval of policy rates and forms. State laws
also regulate the amount of both the aggregate and individual risks that may be
insured, the payment of dividends by the insurer, changes in control and
transactions among affiliates. Additionally, the Insurer is required to maintain
contingency reserves on its liabilities in certain amounts and for certain
periods of time.

    Effective February 17, 1998, MBIA, Inc. acquired all of the outstanding
stock of CapMAC, through a merger with its parent, CapMAC Holdings, Inc.
Pursuant to a reinsurance agreement, CapMAC has ceded all of its net insured
risks (including any amounts due but unpaid from third party reinsurers), as
well as its unearned premiums and contingency reserves to MBIA. MBIA, Inc. is
not obligated to pay debts of or claims against CapMAC.

    As of December 31, 1997, the insurer had admitted assets of $5.3 billion
(audited), total liabilities of $3.5 billion (audited), and total capital and
surplus of $1.8 billion (audited) determined in accordance with statutory
accounting practices prescribed or permitted by insurance regulatory
authorities. As of March 31, 1998, MBIA had admitted assets of $5.4 billion
(unaudited), total liabilities of $3.6 billion (unaudited), and total capital
and surplus of $1.8 billion (unaudited), determined in accordance with statutory
accounting practices prescribed or permitted by insurance regulatory
authorities. Copies of MBIA's financial statements prepared in accordance with
statutory accounting practices are available from MBIA. The address of MBIA is
113 King Street, Armonk, New York 10504.

    Effective December 31, 1989, MBIA, Inc. acquired Bond Investors Group, Inc.
On January 5, 1990, MBIA acquired all of the outstanding stock of Bond Investors
Group, Inc., the parent of Bond Investors Guaranty Insurance Company (BIG), now
known as MBIA Insurance Corp. of Illinois. Through a reinsurance agreement, BIG
has ceded all of its net insured risks, as well as its unearned premium and
contingency reserves, to MBIA and MBIA has reinsured BIG's net outstanding
exposure.

    Moody's Investors Service, Inc. rates all bond issues insured by MBIA "Aaa"
and short-term loans "MIG-1," both designated to be of the highest quality.
Standard & Poor's rates all new issues insured by MBIA "AAA" Prime Grade.
Moody's, Standard & Poor's and Fitch IBCA, Inc. (formerly Fitch Investors
Service, L.P.), all rate the claims paying ability of MBIA as "Triple A." The 
Moody's Investors Service, Inc. rating of MBIA should be evaluated independently
of the Standard & Poor's rating of MBIA. No application has been made
to any other rating agency in order to obtain additional ratings on the
Obligations. The ratings reflect the respective rating agency's current
assessment of the creditworthiness of MBIA and its ability to pay claims on its
policies of insurance. Any further explanation as to the significance of the
above ratings may be obtained only from the applicable rating agency.

    The above ratings are not recommendations to buy, sell or hold the
Obligations and such ratings may be subject to revision or withdrawal at any
time by the rating agencies. Any downward revision or withdrawal of either or
both ratings may have an adverse effect on the market price of the Obligations.

    Financial Guaranty Insurance Company ("Financial Guaranty" or "FGIC") is a
wholly-owned subsidiary of FGIC Corporation (the "Corporation"), a Delaware
holding company. The Corporation is a wholly-owned subsidiary of General
Electric Capital Corporation ("GE Capital"). Neither the Corporation nor GE
Capital is obligated to pay the debts of or the claims against Financial
Guaranty. Financial Guaranty is a monoline financial guaranty insurer domiciled
in the State of New York and subject to regulation by the State of New York
Insurance Department. As of December 31, 1997, the total capital and surplus of
Financial Guaranty was $1,255,590,411. Financial Guaranty prepares financial
statements on the basis of both statutory accounting principles, and generally
accepted accounting principles. Copies of such financial statements may be
obtained by writing to Financial Guaranty at 115 Broadway, New York, New York
10006, Attention: Communications Department, telephone number: (212) 312-3000 or
to the New York State Insurance Department at 25 Beaver Street, New York, New
York 10004-2319, Attention: Financial Condition Property/Casualty Bureau,
telephone number: (212) 480-5187.

    In addition, Financial Guaranty is currently licensed to write insurance in
all 50 states and the District of Columbia.

    Financial Security Assurance Inc. ("Financial Security" or "FSA") is a
monoline insurance company incorporated in 1984 under the laws of the State of
New York. Financial Security is licensed to engage in the financial guaranty
insurance business in all 50 states, the District of Columbia and Puerto Rico.

    Financial Security and its subsidiaries are engaged in the business of
writing financial guaranty insurance, principally in respect of securities
offered in domestic and foreign markets. In general, financial guaranty
insurance consists of the issuance of a guaranty of scheduled payments of an
issuer's securities, thereby enhancing the credit rating of those securities, in
consideration for payment of a premium to the insurer. Financial Security and
its subsidiaries principally insure asset-backed, collateralized and municipal
securities. Asset-backed securities are generally supported by residential
mortgage loans, consumer or trade receivables, securities or other assets having
an ascertainable cash flow or market value. Collateralized securities include
public utility first mortgage bonds and sale/leaseback obligation bonds.
Municipal securities consist largely of general obligation bonds, special
revenue bonds and other special obligations of state and local governments.
Financial Security insures both newly issued securities sold in the primary
market and outstanding securities sold in the secondary market that satisfy
Financial Security's underwriting criteria.

    Financial Security is a wholly-owned subsidiary of Financial Security
Assurance Holdings Ltd. ("Holdings"), a New York Stock Exchange listed company.
Major shareholders of Holdings include Fund American Enterprises Holdings, Inc.,
U S WEST Capital Corporation and The Tokio Marine and Fire Insurance Co., Ltd.
No shareholder of Financial Security is obligated to pay any debt of Financial
Security or its subsidiaries or any claim under any insurance policy issued by
Financial Security or its subsidiaries or to make any additional contribution to
the capital of Financial Security or its subsidiaries. As of March 31, 1998, the
total policyholders' surplus and contingency reserves and the total unearned
premium reserve, respectively, of Financial Security and its consolidated
subsidiaries were, in accordance with statutory accounting principles,
approximately $808,603,000 (unaudited) and $503,683,000 (unaudited), and the
total shareholders' equity and the total unearned premium reserve, respectively,
of Financial Security and its consolidated subsidiaries were, in accordance with
generally accepted accounting principles, approximately $923,047,000 (unaudited)
and $428,158,000 (unaudited). Copies of Financial Security's financial
statements may be obtained by writing to Financial Security at 350 Park Avenue,
New York, New York, 10022, Attention: Communications Department.
Its telephone number is (212) 826-0100.

    Pursuant to an intercompany agreement, liabilities on financial guaranty
insurance written or reinsured from third parties by Financial Security or any
of its domestic operating insurance company subsidiaries (including FSA
Maryland) are reinsured among such companies on an agreed-upon percentage
substantially proportional to their respective capital, surplus and reserves,
subject to applicable statutory risk limitations. In addition, Financial
Security and FSA Maryland reinsure a portion of their liabilities under certain
of their financial guaranty insurance policies with other reinsurers under
various quota share treaties and on a transaction-by-transaction basis. Such
reinsurance is utilized as a risk management device and to comply with certain
statutory and rating agency requirements; it does not alter or limit the
obligations of Financial Security or FSA Maryland under any financial guaranty
insurance policy.

    The claims-paying ability of Financial Security and FSA Maryland is rated
"Aaa" by Moody's Investors Service, Inc., and "AAA" by Standard & Poor's Ratings
Services, Nippon Investors Service Inc. and Standard & Poor's (Australia) Pty.
Ltd. Such ratings reflect only the views of the respective rating agencies, are
not recommendations to buy, sell or hold securities and are subject to revision
or withdrawal at any time by such rating agencies.

    Capital Guaranty Insurance Company was involved in a merger in 1995. On
December 20, 1995, Capital Guaranty Corporation ("CGC") merged with a subsidiary
of Financial Security Assurance Holdings Ltd. and Capital Guaranty Insurance
Company, CGC's principal operating subsidiary, changed its name to Financial
Security Assurance of Maryland Inc. ("FSA Maryland") and became a wholly owned
subsidiary of Financial Security Assurance Inc. For further description, see
"Financial Security Assurance Inc." herein.

    The address of FSA Maryland and its telephone number are Steuart Tower, One
Market Plaza, San Francisco, CA 94105-1413 and (415) 995-8000. In order to be
in an Insured Trust, Bonds must be insured by one of the Preinsured Bond
Insurers or be eligible for the insurance being obtained by such
Trust. In determining eligibility for insurance, the Preinsured Bond Insurers
and the Portfolio Insurers have applied their own standards which correspond
generally to the standards they normally use in establishing the insurability of
new issues of municipal bonds and which are not necessarily the criteria used in
the selection of Bonds by the Sponsor. To the extent the standards of the
Preinsured Bond Insurers and the Portfolio Insurers are more restrictive than
those of the Sponsor, the previously stated Trust investment criteria have been
limited with respect to the Bonds. This decision is made prior to the Date of
Deposit, as debt obligations not eligible for insurance are not deposited in an
Insured Trust. Thus, all of the Bonds in the portfolios of the Insured Trusts in
the Fund are insured either by the respective Trust or by the issuer of the
Bonds, by a prior owner of such Bonds or by the Sponsor prior to the deposit of
such Bonds in a Trust.

   Because the Bonds are insured by one of the Portfolio Insurers or one of the
Preinsured Bond Insurers as to the timely payment of principal and interest,
when due, and on the basis of the various reinsurance agreements in effect,
Standard & Poor's has assigned to the Units of each Insured Trust its "AAA"
investment rating. Such rating will be in effect for a period of thirteen months
from the Date of Deposit and will, unless renewed, terminate at the end of such
period. See "Description of Ratings". The obtaining of this rating by an Insured
Trust should not be construed as an approval of the offering of the Units by
Standard & Poor's or as a guarantee of the market value of such Trust or of the
Units.

   An objective of portfolio insurance obtained by an Insured Trust is to obtain
a higher yield on the portfolio of such Trust than would be available if all the
Bonds in such portfolio had Standard & Poor's "AAA" rating and yet at the same
time to have the protection of insurance of prompt payment of interest and
principal, when due, on the Bonds. There is, of course, no certainty that this
result will be achieved. Preinsured Bonds in an Insured Trust (all of which are
rated "AAA" by Standard & Poor's) may or may not have a higher yield than
uninsured bonds rated "AAA" by Standard & Poor's. In selecting such Bonds for an
Insured Trust, the Sponsor has applied the criteria hereinbefore described.

   In the event of nonpayment of interest or principal, when due, in respect of
a Bond, AMBAC Assurance shall make such payment not later than 30 days and
Financial Guaranty shall make such payment within one business day after the
respective insurer has been notified that such nonpayment has occurred or is
threatened (but not earlier than the date such payment is due). The insurer, as
regards any payment it may make, will succeed to the rights of the Trustee in
respect thereof. All policies issued by the Portfolio Insurers and the
Preinsured Bond Insurers are substantially identical insofar as obligations to
an Insured Trust are concerned.

   The Internal Revenue Service has issued a letter ruling which holds in effect
that insurance proceeds representing maturing interest on defaulted municipal
obligations paid to holders of insured bonds, under policy provisions
substantially identical to the policies described herein, will be excludable
from Federal gross income under Section 103(a)(1) of the Internal Revenue Code
to the same extent as if such payments were made by the issuer of the municipal
obligations. Holders of Units in an Insured Trust should discuss with their tax
advisers the degree of reliance which they may place on this letter ruling.
However, Chapman and Cutler, counsel for the Sponsor, has given an opinion to
the effect such payment of proceeds would be excludable from Federal gross
income to the extent described under "Federal Tax Status" in Prospectus Part II.

   Each Portfolio Insurer is subject to regulation by the department of
insurance in the state in which it is qualified to do business. Such regulation,
however, is no guarantee that each Portfolio Insurer will be able to perform on
its contract of insurance in the event a claim should be made thereunder at some
time in the future. At the date hereof, it is reported that no claims have been
submitted or are expected to be submitted to any of the Portfolio Insurers which
would materially impair the ability of any such company to meet its commitment
pursuant to any contract of bond or portfolio insurance.

   The information relating to each Portfolio Insurer has been furnished by such
companies. The financial information with respect to each Portfolio Insurer
appears in reports filed with state insurance regulatory authorities and is
subject to audit and review by such authorities. No representation is made
herein as to the accuracy or adequacy of such information or as to the absence
of material adverse changes in such information subsequent to the dates thereof.

                            PORTFOLIO ADMINISTRATION

   The Trustee is empowered to sell, for the purpose of redeeming Units tendered
by any Unitholder, and for the payment of expenses for which funds may not be
available, such of the Bonds designated by the Evaluator as the Trustee in its
sole discretion may deem necessary. The Evaluator, in designating such Bonds,
will consider a variety of factors including (a) interest rates, (b) market
value and (c) marketability. The Sponsor, in connection with the Quality Trusts,
may direct the Trustee to dispose of Bonds upon default in payment of principal
or interest, institution of certain legal proceedings, default under other
documents adversely affecting debt service, default in payment of principal or
interest or other obligations of the same issuer, decline in projected income
pledged for debt service on revenue bonds or decline in price or the occurrence
of other market or credit factors, including advance refunding (i.e., the
issuance of refunding securities and the deposit of the proceeds thereof in
trust or escrow to retire the refunded securities on their respective redemption
dates), so that in the opinion of the Sponsor the retention of such Bonds would
be detrimental to the interest of the Unitholders. In connection with the
Insured Trusts to the extent that Bonds are sold which are current in payment of
principal and interest in order to meet redemption requests and defaulted Bonds
are retained in the portfolio in order to preserve the related insurance
protection applicable to said Bonds, the overall quality of the Bonds remaining
in such Trust's portfolio will tend to diminish. Except as described in this
section and in certain other unusual circumstances for which it is determined by
the Trustee to be in the best interests of the Unitholders or if there is no
alternative, the Trustee is not empowered to sell Bonds from an Insured Trust
which are in default in payment of principal or interest or in significant risk
of such default and for which value has been attributed for the insurance
obtained by such Insured Trust. Because of restrictions on the Trustee under
certain circumstances, the Sponsor may seek a full or partial suspension of the
right of Unitholders to redeem their Units in an Insured Trust. See "Rights of
Unitholders--Redemption of Units" in Prospectus Part II. The Sponsor is
empowered, but not obligated, to direct the Trustee to dispose of Bonds in the
event of an advanced refunding.

   The Sponsor is required to instruct the Trustee to reject any offer made by
an issuer of any of the Bonds to issue new obligations in exchange or
substitution for any Bond pursuant to a refunding or refinancing plan, except
that the Sponsor may instruct the Trustee to accept or reject such an offer or
to take any other action with respect thereto as the Sponsor may deem proper if
(1) the issuer is in default with respect to such Bond or (2) in the written
opinion of the Sponsor the issuer will probably default with respect to such
Bond in the reasonably foreseeable future. Any obligation so received in
exchange or substitution will be held by the Trustee subject to the terms and
conditions of the Trust Agreement to the same extent as Bonds originally
deposited thereunder. Within five days after the deposit of obligations in
exchange or substitution for underlying Bonds, the Trustee is required to give
notice thereof to each Unitholder of the Trust thereby affected, identifying the
Bonds eliminated and the Bonds substituted therefor. Except as stated herein and
under "Fund Administration--Replacement Bonds" in Prospectus Part II regarding
the substitution of Replacement Bonds for Failed Bonds, the acquisition by the
Fund of any securities other than the Bonds initially deposited is not
permitted.

   If any default in the payment of principal or interest on any Bonds occurs
and no provision for payment is made therefor within 30 days, the Trustee is
required to notify the Sponsor thereof. If the Sponsor fails to instruct the
Trustee to sell or to hold such Bonds within 30 days after notification by the
Trustee to the Sponsor of such default, the Trustee may in its discretion sell
the defaulted Bond and not be liable for any depreciation or loss thereby
incurred.

                               TRUSTEE INFORMATION

   The Trustee is The Bank of New York, a trust company organized under the laws
of New York. The Bank of New York has its unit investment trust division offices
at 101 Barclay Street, New York, New York 10286, telephone (800) 221-7668. The
Bank of New York is subject to supervision and examination by the Superintendent
of Banks of the State of New York and the Board of Governors of the Federal
Reserve System, and its deposits are insured by the Federal Deposit Insurance
Corporation to the extent permitted by law.

   The duties of the Trustee are primarily ministerial in nature. It did not
participate in the selection of Bonds for the portfolios of any of the Trusts.
In accordance with the Trust Agreement, the Trustee shall keep proper books of
record and account of all transactions at its office for the Fund. Such records
shall include the name and address of, and the certificates issued by the Fund
to, every Unitholder of the Fund. Such books and records shall be open to
inspection by any Unitholder at all reasonable times during the usual business
hours. The Trustee shall make such annual or other reports as may from time to
time be required under any applicable state or Federal statute, rule or
regulation. The Trustee is required to keep a certified copy or duplicate
original of the Trust Agreement on file in its office available for inspection
at all reasonable times during the usual business hours by any Unitholder,
together with a current list of the Bonds held in the Fund.

   Under the Trust Agreement, the Trustee or any successor trustee may resign
and be discharged of the trusts created by the Trust Agreement by executing an
instrument in writing and filing the same with the Sponsor. The Trustee or
successor trustee must mail a copy of the notice of resignation to all Fund
Unitholders then of record, not less than 60 days before the date specified in
such notice when such resignation is to take effect. The Sponsor upon receiving
notice of such resignation is obligated to appoint a successor trustee promptly.
If, upon such resignation, no successor trustee has been appointed and has
accepted the appointment within 30 days after notification, the retiring Trustee
may apply to a court of competent jurisdiction for the appointment of a
successor. The Sponsor may remove the Trustee and appoint a successor trustee as
provided in the Trust Agreement at any time with or without cause. Notice of
such removal and appointment shall be mailed to each Unitholder by the Sponsor.
Upon execution of a written acceptance of such appointment by such successor
trustee, all the rights, powers, duties and obligations of the original trustee
shall vest in the successor. The resignation or removal of a Trustee becomes
effective only when the successor trustee accepts its appointment as such or
when a court of competent jurisdiction appoints a successor trustee. Any
corporation into which a Trustee may be merged or with which it may be
consolidated, or any corporation resulting from any merger or consolidation to
which a Trustee shall be a party, shall be the successor trustee. The Trustee
must be a banking corporation organized under the laws of the United States or
any state and having at all times an aggregate capital, surplus and undivided
profits of not less than $5,000,000.

                       TERMINATION OF THE TRUST AGREEMENT

   A Trust may be terminated at any time by consent of Unitholders of 51% of the
Units of such Trust then outstanding or by the Trustee when the value of such
Trust, as shown by any semi-annual evaluation, is less than 20% of the original
principal amount of Bonds. A Trust will be liquidated by the Trustee in the
event that a sufficient number of Units not yet sold are tendered for redemption
by the Underwriters, including the Sponsor, so that the net worth of such Trust
would be reduced to less than 40% of the initial principal amount of such Trust.
If a Trust is liquidated because of the redemption of unsold Units by the
Underwriters, the Sponsor will refund to each purchaser of Units the entire
sales charge paid by such purchaser. The Trust Agreement provides that each
Trust shall terminate upon the redemption, sale or other disposition of the last
Bond held in such Trust, but in no event shall it continue beyond the end of the
year preceding the fiftieth anniversary of the Trust Agreement in the case of an
IM-IT Discount, a U.S. Territorial IM-IT, a Long-Term State or a National
Quality Trust, or beyond the end of the year preceding the twentieth anniversary
of the Trust Agreement in the case of IM-IT Limited Maturity, IM-IT
Intermediate, State Intermediate Laddered Maturity and IM-IT Short Intermediate
Trusts. In the event of termination of any Trust, written notice thereof will be
sent by the Trustee to each Unitholder of such Trust at his address appearing on
the registration books of the Fund maintained by the Trustee. Within a
reasonable time thereafter the Trustee shall liquidate any Bond then held in
such Trust and shall deduct from the funds of such Trust any accrued costs,
expenses or indemnities provided by the Trust Agreement, including estimated
compensation of the Trustee and costs of liquidation and any amounts required as
a reserve to provide for payment of any applicable taxes or other government
charges. The sale of Bonds in the Trust upon termination may result in a lower
amount than might otherwise be realized if such sale were not required at such
time. For this reason, among others, the amount realized by a Unitholder upon
termination may be less than the principal amount or par amount of Bonds
represented by the Units held by such Unitholder. The Trustee shall then
distribute to each Unitholder his share of the balance of the Interest and
Principal Accounts. With such distribution the Unitholder shall be furnished a
final distribution statement of the amount distributable. At such time as the
Trustee in its sole discretion shall determine that any amounts held in reserve
are no longer necessary, it shall make distribution thereof to Unitholders in
the same manner.

   Notwithstanding the foregoing, in connection with final distributions to
Unitholders of an Insured Trust, it should be noted that because the portfolio
insurance obtained by an Insured Trust is applicable only while Bonds so insured
are held by such Trust, the price to be received by such Trust upon the
disposition of any such Bond which is in default, by reason of nonpayment of
principal or interest, will not reflect any value based on such insurance.
Therefore, in connection with any liquidation, it shall not be necessary for the
Trustee to, and the Trustee does not currently intend to, dispose of any Bond or
Bonds if retention of such Bond or Bonds, until due, shall be deemed to be in
the best interest of Unitholders, including, but not limited to, situations in
which a Bond or Bonds so insured have deteriorated market prices resulting from
a significant risk of default. Since the Preinsured Bonds will reflect the value
of the related insurance, it is the present intention of the Sponsor not to
direct the Trustee to hold any of such Preinsured Bonds after the date of
termination. All proceeds received, less applicable expenses, from insurance on
defaulted Bonds not disposed of at the date of termination will ultimately be
distributed to Unitholders of record as of such date of termination as soon as
practicable after the date such defaulted Bond or Bonds become due and
applicable insurance proceeds have been received by the Trustee.

                             DESCRIPTION OF RATINGS

   Standard & Poor's, A Division of the McGraw-Hill Companies. A Standard &
Poor's municipal bond rating is a current assessment of the creditworthiness of
an obligor with respect to a specific debt obligation. This assessment of
creditworthiness may take into consideration obligors such as guarantors,
insurers or lessees.

   The bond rating is not a recommendation to purchase or sell a security,
inasmuch as it does not comment as to market price.

   The ratings are based on current information furnished to Standard & Poor's
by the issuer and obtained by Standard & Poor's from other sources it considers
reliable. The ratings may be changed, suspended or withdrawn as a result of
changes in, or unavailability of, such information.

   The ratings are based, in varying degrees, on the following considerations:
       I.   Likelihood of default--capacity and willingness of the obligor as to
            the timely payment of interest and repayment of principal in
            accordance with the terms of the obligation.

       II.  Nature of and provisions of the obligation.

       III. Protection afforded by, and relative position of, the obligation in
            the event of bankruptcy, reorganization or other arrangements under
            the laws of bankruptcy and other laws affecting creditors' rights.

   AAA--This is the highest rating assigned by Standard & Poor's to a debt
obligation and indicates an extremely strong capacity to pay principal and
interest.

   AA--Bonds rated AA also qualify as high-quality debt obligations. Capacity to
pay principal and interest is very strong, and in the majority of instances they
differ from AAA issues only in small degree.

   A--Bonds rated A have a strong capacity to pay principal and interest,
although they are somewhat more susceptible to the adverse effects of changes in
circumstances and economic conditions.

   BBB--Bonds rated BBB are regarded as having an adequate capacity to pay
interest and repay principal. Whereas they normally exhibit adequate protection
parameters, adverse economic conditions or changing circumstances are more
likely to lead to a weakened capacity to pay interest and repay principal for
debt in this category than in higher rated categories.

   Plus (+) or Minus (-): To provide more detailed indications of credit
quality, the ratings from "AA" to "BBB" may be modified by the addition of a
plus or minus sign to show relative standing within the major rating categories.

   Provisional Ratings: A provisional rating ("p") assumes the successful
completion of the project being financed by the issuance of the bonds being
rated and indicates that payment of debt service requirements is largely or
entirely dependent upon the successful and timely completion of the project.
This rating, however, while addressing credit quality subsequent to completion,
makes no comment on the likelihood of, or the risk of default upon failure of,
such completion. Accordingly, the investor should exercise his own judgment with
respect to such likelihood and risk.

   Moody's Investors Service, Inc. A brief description of the applicable Moody's
rating symbols and their meanings follows:

   Aaa--Bonds which are rated Aaa are judged to be the best quality. They carry
the smallest degree of investment risk and are generally referred to as "gilt
edge". Interest payments are protected by a large, or by an exceptionally
stable, margin and principal is secure. While the various protective elements
are likely to change, such changes as can be visualized are most unlikely to
impair the fundamentally strong position of such issues. With the occasional
exception of oversupply in a few specific instances, the safety of obligations
of this class is so absolute that their market value is affected solely by money
market fluctuations.

   Aa--Bonds which are rated Aa are judged to be of high quality by all
standards. Together with the Aaa group they comprise what are generally known as
high grade bonds. They are rated lower than the best bonds because margins of
protection may not be as large as in Aaa securities or fluctuations of
protective elements may be of greater amplitude or there may be other elements
present which make the long-term risks appear somewhat larger than in Aaa
securities. These Aa bonds are high grade, their market value virtually immune
to all but money market influences, with the occasional exception of oversupply
in a few specific instances.

   A--Bonds which are rated A possess many favorable investment attributes and
are to be considered as higher medium grade obligations. Factors giving security
to principal and interest are considered adequate, but elements may be present
which suggest a susceptibility to impairment sometime in the future. The market
value of A-rated bonds may be influenced to some degree by credit circumstances
during a sustained period of depressed business conditions. During periods of
normalcy, bonds of this quality frequently move in parallel with Aaa and Aa
obligations, with the occasional exception of oversupply in a few specific
instances.

   Baa--Bonds which are rated Baa are considered as medium grade obligations;
i.e., they are neither highly protected nor poorly secured. Interest payments
and principal security appear adequate for the present but certain protective
elements may be lacking or may be characteristically unreliable over any great
length of time. Such bonds lack outstanding investment characteristics and in
fact have speculative characteristics as well.

   Moody's bond rating symbols may contain numerical modifiers of a generic
rating classification. The modifier 1 indicates that the bond ranks at the high
end of its category; the modifier 2 indicates a mid-range ranking; and the
modifier 3 indicates that the issue ranks in the lower end of its generic rating
category.

   Con--Bonds for which the security depends upon the completion of some act or
the fulfillment of some condition are rated conditionally. These are bonds
secured by (a) earnings of projects under construction, (b) earnings of projects
unseasoned in operating experience, (c) rentals which begin when facilities are
completed, or (d) payments to which some other limiting condition attaches.
Parenthetical rating denotes probable credit stature upon completion of
construction or elimination of basis of condition.

               EQUIVALENT TAXABLE ESTIMATED CURRENT RETURN TABLES

   As of the date of the Prospectus, the following tables show the approximate
taxable estimated current returns for individuals that are equivalent to
tax-exempt estimated current returns under combined Federal and State taxes
(where applicable) using the published Federal and State tax rates (where
applicable) scheduled to be in effect in 1998. They incorporate increased tax
rates for higher income taxpayers that were included in the Revenue
Reconciliation Act of 1993. These tables illustrate approximately what you would
have to earn on taxable investments to equal the tax-exempt estimated current
return in your income tax bracket. The tables assume that Federal taxable income
is equal to State income subject to tax, and for cases in which more than one
State rate falls within a Federal bracket, the State rate corresponding to the
highest income within that Federal bracket is used. The combined State and
Federal tax rates shown reflect the fact that State tax payments are currently
deductible for Federal tax purposes. The tables do not reflect any local taxes
or any taxes other than personal income taxes. The tables do not show the
approximate taxable estimated current returns for individuals that are subject
to the alternative minimum tax. The taxable equivalent estimated current returns
may be somewhat higher than the equivalent returns indicated in the following
tables for those individuals who have adjusted gross incomes in excess of
$124,500. The tables do not reflect the effect of Federal or State limitations
(if any) on the amount of allowable itemized deductions and the deduction for
personal or dependent exemptions or any other credits. These limitations were
designed to phase out certain benefits of these deductions for higher income
taxpayers. These limitations, in effect, raise the marginal maximum Federal tax
rate to approximately 44 percent for taxpayers filing a joint return and
entitled to four personal exemptions and to approximately 41 percent for
taxpayers filing a single return entitled to only one personal exemption. These
limitations are subject to certain maximums, which depend on the number of
exemptions claimed and the total amount of taxpayer's itemized deductions. For
example, the limitation on itemized deductions will not cause a taxpayer to lose
more than 80% of his allowable itemized deductions, with certain exceptions. See
"Federal Tax Status" in Prospectus Part II for a more detailed discussion of
recent Federal tax legislation.

<TABLE>
CALIFORNIA
<CAPTION>
         Taxable Income ($1,000's)                                 Tax-Exempt Estimated Current Return
     ----------------------------------        --------------------------------------------------------------------------
          Single           Joint             Tax          4%      4 1/2%     5%       5 1/2%     6%      6 1/2%      7%
          Return          Return           Bracket*                 Equivalent Taxable Estimated Current Return
     --------------------------------------------------------------------------------------------------------------------
<S>                   <C>                   <C>         <C>       <C>       <C>      <C>       <C>       <C>       <C>
     $     0 - 25.35  $     0 - 42.35       20.1%       5.01%     5.63%     6.26%     6.88%     7.51%     8.14%     8.76%
       25.35 - 61.40   42.35 - 102.30       34.7        6.13      6.89      7.66      8.42      9.19      9.95     10.72
      61.40 - 128.10  102.30 - 155.95       37.4        6.39      7.19      7.99      8.79      9.58     10.38     11.18
     128.10 - 278.45  155.95 - 278.45       42.0        6.90      7.76      8.62      9.48     10.34     11.21     12.07
         Over 278.45      Over 278.45       45.2        7.30      8.21      9.12     10.04     10.95     11.86     12.77
- -------------------
*The State tax brackets are those for 1997. The 1998 brackets will be adjusted
to take into account changes in the California Consumer Price Index. These
adjustments have not yet been released.

<CAPTION>
MICHIGAN
         Taxable Income ($1,000's)                                 Tax-Exempt Estimated Current Return
     ----------------------------------        ---------------------------------------------------------------------------
          Single           Joint           Tax          4%       4 1/2%     5%        5 1/2%     6%      6 1/2%      7%
          Return          Return         Bracket                  Equivalent Taxable Estimated Current Return
     ---------------------------------------------------------------------------------------------------------------------
<S>                   <C>                   <C>         <C>       <C>       <C>      <C>       <C>       <C>       <C>
     $    0- 25.35    $      0- 42.35       18.7%       4.92%     5.54%     6.15%     6.77%     7.38%     8.00%     8.61%
      25.35- 61.40       42.35-102.30       31.2        5.81      6.54      7.27      7.99      8.72      9.45     10.17
      61.40-128.10      102.30-155.95       34.0        6.06      6.82      7.58      8.33      9.09      9.85     10.61
     128.10-278.45      155.95-278.45       38.8        6.54      7.35      8.17      8.99      9.80     10.62     11.44
       Over 278.45        Over 278.45       42.3        6.93      7.80      8.67      9.53     10.40     11.27     12.13

<CAPTION>
NEW JERSEY
         Taxable Income ($1,000's)                                 Tax-Exempt Estimated Current Return
     ----------------------------------        ---------------------------------------------------------------------------
          Single           Joint          Tax          4%         4 1/2%     5%      5 1/2%      6%      6 1/2%       7%
          Return          Return        Bracket                 Equivalent Taxable Estimated Current Return
     ---------------------------------------------------------------------------------------------------------------------
<S>                   <C>                   <C>         <C>       <C>       <C>      <C>       <C>       <C>       <C>
     $     0- 25.35   $       0- 42.35       16.5%       4.79%     5.39%     5.99%     6.59%     7.19%     7.78%     8.38%
       25.35- 61.40       42.35-102.30       32.0        5.88      6.62      7.35      8.09      8.82      9.56     10.29
       61.40-128.10      102.30-155.95       35.4        6.19      6.97      7.74      8.51      9.29     10.06     10.84
      128.10-278.45      155.95-278.45       40.1        6.68      7.51      8.35      9.18     10.02     10.85     11.69
        Over 278.45        Over 278.45       43.4        7.07      7.95      8.83      9.72     10.60     11.48     12.37
</TABLE>

   A comparison of tax-free and equivalent taxable estimated current returns
with the returns on various taxable investments is one element to consider in
making an investment decision. The Sponsor may from time to time in its
advertising and sales materials compare the then current estimated returns on
the Trusts and returns over specified periods on other similar Van Kampen
sponsored unit investment trusts with inflation rates and with returns on
taxable investments such as corporate or U.S. Government bonds, bank CDs and
money market accounts or money market funds, each of which has investment
characteristics that may differ from those of the Trusts. U.S. Government bonds,
for example, are backed by the full faith and credit of the federal government.
Money market accounts and money market funds provide stability of principal, but
pay interest at rates that vary with the condition of the short-term debt
market. The investment characteristics of the Trusts are described more fully in
the Prospectus.

                             CALIFORNIA RISK FACTORS

   Economic Factors. Each California Trust is susceptible to political, economic
or regulatory factors affecting issuers of California municipal obligations (the
"California Municipal Obligations"). These include the possible adverse effects
of certain California constitutional amendments, legislative measures, voter
initiatives and other matters that are described below. The following
information provides only a brief summary of the complex factors affecting the
financial situation in California (the "State") and is derived from sources that
are generally available to investors and are believed to be accurate. No
independent verification has been made of the accuracy or completeness of any of
the following information. It is based in part on information obtained from
various State and local agencies in California or contained in Official
Statements for various California Municipal Obligations.

   There can be no assurance that future statewide or regional economic
difficulties, and the resulting impact on State or local governmental finances
generally, will not adversely affect the market value of California Municipal
Obligations held in the portfolio of a Trust or the ability of particular
obligors to make timely payments of debt service on (or relating to) those
obligations.

   Since the recession in California in the early 1990's, California has made a
significant recovery. Deep cuts in the nation's defense budget were the main
reason that California's downturn was so severe. By 1996, nearly 60% of
California's more than 385,000 aerospace jobs had been eliminated. In addition,
California suffered more than two-thirds of all of the nation's job losses
resulting from military base closures. Federal Department of Defense civilian
employment in California is down more than 60,000 from the late 1980s peak and
is still falling.

   Yet, in 1997, California's economy outperformed the national economy due to
strong growth in high-technology manufacturing and services. Employment growth
was 3.1% in 1997, adding approximately 400,000 new jobs. Since 1995,
California's rate of job growth has been roughly one and one-half times the
national average rate of increase. Among industries, business services is the
leading job producer adding close to 70,000 jobs in 1997. One-third of that
increase was concentrated in computer software. Construction was California's
second leading source of new jobs in 1997, adding nearly 50,000 jobs, driven by
a 28% increase in nonresidential building activity. California's large labor
force, at 15,873,000 in 1997, had an unemployment rate of 6.3% in 1997. In
comparison, the 1997 unemployment rate for the United States was 4.9%.

   Personal income grew by 7.2% in 1997. Personal income exceeded the national
rate of increase by a considerable margin. Wage and salary increased by 7.7%;
proprietors' growth was 7.9%; and an increase in property income (dividends,
interest, and rent) was over 9.3%. In contrast, transfer payments (including
unemployment insurance, welfare, Social Security, and Medicare) were up only 2%
in 1997, the smallest gain in more than 60 years.

   California is the nation's leading export state, with shipments of
California-made goods to other countries exceeding $100 billion in 1996.
California exports 15 to 16% of its trillion dollar domestic product to other
countries, compared to less than 11% for the U.S. as a whole. Events in Asia
could have implications for California. Over half of California-made goods
exports are sold to Asia, and the state has already seen declines in cargoes
destined for Japan, South Korea, Singapore and Malaysia. At the same time,
strong growth continues in exports to Taiwan, Hong Kong, and Mexico. Overall,
exports of California-made goods slowed to 2% growth in the first half of 1997,
from over 8% the year before. Strong export growth was a major element during
the initial stages of the state's recovery in 1994 and 1995. The upturn has
broadened sufficiently over the last two years, to the point that California is
now posting solid gains in employment and income despite the slowing of exports.
   For 1998, California's economy should continue to see robust growth.

Nonfarm employment is expected to increase 2.8% or 365,000 jobs. Unemployment is
expected to drop to 5.6% in 1998. Personal income is projected to drop slightly
to a 6.3% increase in 1998.

   During 1997, several tax reform and business measures were enacted.
California's Workers' Compensation system which previously had some of the
highest premiums and lowest benefits in the nation, was reformed with a 40%
premium reduction, saving employers more than $4 billion per year. The Bank and
Corporation tax was cut by 5% to 8.84%, thus lowering the cost of doing business
in California by $300 million per year. The tax rate on Subchapter "S"
corporations was reduced from 2.5% to 1.5%, and the requirements for
qualification for Subchapter "S" status were conformed to recent federal law
changes. Personal income taxes were reduced by $1.1 billion in 1997 and when the
tax package is fully implemented in 1999-2000, the personal income tax cut will
total $800 million.

             CONSTITUTIONAL LIMITATIONS ON TAXES AND APPROPRIATIONS

   Limitation on Taxes. Certain California municipal obligations may be
obligations of issuers which rely in whole or in part, directly or indirectly,
on ad valorem property taxes as a source of revenue. The taxing powers of
California local governments and districts are limited by Article XIIIA of the
California Constitution, enacted by the voters in 1978 and commonly known as
"Proposition 13." Briefly, Article XIIIA limits to 1% of full cash value the
rate of ad valorem property taxes on real property and generally restricts the
reassessment of property to the rate of inflation, not to exceed 2% per year or
decline in value, except upon new construction or change of ownership (subject
to a number of exemptions). Taxing entities may, however, raise ad valorem taxes
above the 1% limit to pay debt service on voter-approved bonded indebtedness.

   Under Article XIIIA, the basic 1% ad valorem tax levy is applied against the
assessed value of property as of the owner's date of acquisition (or as of March
1, 1975, if acquired earlier), subject to certain adjustments. This system has
resulted in widely varying amounts of tax on similarly situated properties.
Several lawsuits have been filed challenging the acquisition-based assessment
system of Proposition 13 and on June 18, 1992, the U.S. Supreme Court announced
a decision upholding Proposition 13.

   Article XIIIA prohibits local governments from raising revenues through ad
valorem property taxes above the 1% limit; it also requires voters of any
governmental unit to give two-thirds approval to levy any "special tax." Court
decisions, however, allowed non-voter approved levy of "general taxes" which
were not dedicated to a specific use. In response to these decisions, the voters
of the State in 1986 adopted an initiative statute which imposed significant new
limits on the ability of local entities to raise or levy general taxes, except
by receiving majority local voter approval. Significant elements of this
initiative, "Proposition 62," have been overturned in recent court cases. An
initiative proposed to re-enact the provisions of Proposition 62 as a
constitutional amendment was defeated by the voters in November 1990, but such a
proposal may be renewed in the future.

   Appropriations Limits. California and its local governments are subject to an
annual "appropriations limit" imposed by Article XIIIB of the California
Constitution, enacted by the voters in 1979 and significantly amended by
Propositions 98 and 111 in 1988 and 1990, respectively. Article XIIIB prohibits
the State or any covered local government from spending "appropriations subject
to limitation" in excess of the appropriations limit imposed. "Appropriations
subject to limitation" are authorizations to spend "proceeds of taxes," which
consist of tax revenues, and certain other funds, including proceeds from
regulatory licenses, user charges or other fees, to the extent that such
proceeds exceed the cost of providing the product or service, but "proceeds of
taxes" exclude most State subventions to local governments. No limit is imposed
on appropriations of funds which are not "proceeds of taxes," such as reasonable
user charges or fees, and certain other non-tax funds, including bond proceeds.

   Among the expenditures not included in the Article XIIIB appropriations limit
are (1) the debt service cost of bonds issued or authorized prior to January 1,
1979 or subsequently authorized by the voters, (2) appropriations arising from
certain emergencies declared by the Governor, (3) appropriations for certain
capital outlay projects, (4) appropriations by the State of post-1989 increases
in gasoline taxes and vehicle weight fees, and (5) appropriations made in
certain cases of emergency.

   The appropriations limit for each year is adjusted annually to reflect
changes in cost of living and population, and any transfers of service
responsibilities between government units. The definitions for such adjustments
were liberalized in 1990 by Proposition 111 to follow more closely growth in
California's economy.

   "Excess" revenues are measured over a two-year cycle. With respect to local
governments, excess revenues must be returned by a revision of tax rates or fee
schedules within the two subsequent fiscal years. The appropriations limit for a
local government may be overridden by referendum under certain conditions for up
to four years at a time. With respect to the State, 50% of any excess revenues
is to be distributed to K-12 school districts and community college districts
(collectively, "K-14 districts") and the other 50% is to be refunded to
taxpayers. With more liberal annual adjustment factors since 1988, and depressed
revenues since 1990 because of the recession, few governments, including the
State, are currently operating near their spending limits, but this condition
may change over time. Local governments may by voter approval exceed their
spending limits for up to four years.

   Because of the complex nature of Articles XIIIA and XIIIB of the California
Constitution, the ambiguities and possible inconsistencies in their terms, and
the impossibility of predicting future appropriations or changes in population
and cost of living, and the probability of continuing legal challenges, it is
not currently possible to determine fully the impact of Article XIIIA or Article
XIIIB on California Municipal Obligations or the ability of California or local
governments to pay debt service on such California Municipal Obligations. It is
not presently possible to predict the outcome of any pending litigation with
respect to the ultimate scope, impact or constitutionality of either Article
XIIIA or Article XIIIB, or the impact of any such determinations upon State
agencies or local governments, or upon their ability to pay debt service on
their obligations. Future initiatives or legislative changes in laws or the
California Constitution may also affect the ability of the State or local
issuers to repay their obligations.

   Obligations of the State of California. Under the California Constitution,
debt service on outstanding general obligation bonds is the second charge to the
General Fund after support of the public school system and public institutions
of higher education. The State had $14.9 billion aggregate principal amount of
non-self liquidating general obligation bonds outstanding, and $6.4 billion
authorized and unissued, as of December 31, 1997. Outstanding lease revenue
bonds totaled $7.2 billion as of December 31, 1997, and are estimated to total
$7.5 billion as of June 30, 1998.

   From July 1, 1996 to July 1, 1997, the State issued approximately $1.03
billion in non-self liquidating general obligation bonds and $1.26 billion in
revenue bonds. Refunding bonds, which are used to refinance existing long-term
debt, accounted for none of the general obligation bonds and $841.38 million of
the revenue bonds.

   General Fund general obligation debt service expenditures for fiscal year 
1996-97 were $1.92 billion, and are estimated at $1.89 billion for fiscal year
1997-98.

   Recent Financial Results. California maintains a Special Fund for Economic
Uncertainties (the "Economic Uncertainties Fund"), derived from General Fund
revenues, as a reserve to meet cash needs of the General Fund. As of November
30, 1997, the General Fund had outstanding internal loans from Special Funds of
$2.8 billion (in addition, there are $3 billion of external loans represented by
the 1997 Revenue Anticipation Notes, which mature on June 30, 1998). The revised
projected 1997-98 fiscal year balance in the General Fund Reserve for Economic
Uncertainties is $329 million. Special Fund revenues are estimated at $14.2
billion for the 1997-98 fiscal year and appropriated Special Fund expenditures
at $14.4 billion.

   The Budget. California's solid economic performance during 1997 led to
healthy revenue growth. General Fund collections grew by over 6% in fiscal year
1996-97 to reach $49.2 billion, an increase of $2.9 billion from the prior year.
Revenue for the 1997-98 and 1998-99 fiscal years is expected to reach $52.9
billion and $55.4 billion, respectively. This represents annual growth of $3.7
billion (7.5%) for 1997-98 and $2.5 billion (4.7%) for 1998-99.

   Overall, General Fund revenues and transfers represent nearly 80% of total
revenues. The remaining 20% are special funds dedicated to specific programs.
The three largest revenue sources (personal income, sales, and bank and
corporation) account for about 75% of total revenues with personal income
comprising 50% of the total. The personal income tax in fiscal year 1997 was
$23,273 million and is expected to increase 11.6% for 1997-98 and 6.4% for
1998-99. The enactment of the Federal Taxpayer Relief Act of 1997 is expected to
result in changes in taxpayer behavior that will generate additional state
revenue (from increased capital gains realizations), adding $480 million to
personal income tax receipts in 1997-98 and $560 million in 1998-99.

   Expenditures for the 1996-97 fiscal year were $49.1 billion, an 8% increase.
Expenditures for the 1997-98 fiscal year are estimated at $53 billion. As of
June 30, 1997, the General Fund balance was $906 million. The estimate for June
30, 1998 is $773.8 million.

   Proposed 1998-99 Budget. The Governor's proposed budget for fiscal year
1998-99 is designed to further economic growth, educational reform, public
safety, and maintain government and environmental quality. K-12 education
remains the State's top funding priority. The Budget includes $350 million to
lengthen the school year to 180 days. The Budget fully funds the fourth and
final year of the Governor's "Compact with Higher Education" and calls for the
development of a new compact with UC and CSU. The Budget provides $50 million in
General Fund and $200 million in a proposed bond to capitalize the
Infrastructure and Development Bank, while will help businesses locate and
expand in California. The Budget also proposes a $7 billion investment plan to
maintain and build the State's school system, water supply, prisons, natural
resources, and other important infrastructure.

   Bond Rating. The State's general obligation bonds have received ratings of
"A1" by Moody's Investors Service, "A+" by Standard & Poor's Ratings Group and
"A+" by Fitch IBCA, Inc. (formerly Fitch Investors Service, L.P.). There can be
no assurance that such ratings will be maintained in the future. It should be
noted that the creditworthiness of obligations issued by local California
issuers may be unrelated to the creditworthiness of obligations issued by the
State of California, and that there is no obligation on the part of the State to
make payment on such local obligations in the event of default.

   Cash Management Policies. Cash temporarily idle during each fiscal year is
invested in the Pooled Money Investment Account (PMIA). The investment of PIMA
is restricted by law to the following categories: U.S. Government securities,
securities of federally sponsored agencies, domestic corporate bonds, bank
notes, interest-bearing time deposits in California banks and savings and loan
associations, prime commercial paper, repurchase and reverse repurchase
agreements, security loans, bankers' acceptances, negotiable certificates of
deposit, and loans to various bond funds. The average daily investment balance
for the year ended June 30, 1997, amounted to $28.3 billion, with an average
effective yield of 5.6%. For the year ended June 30, 1996, the average daily
investment was $26.6 billion and the average effective yield was 5.71%. Total
earnings of the PMIA for fiscal year 1996-97 amounted to $1.6 billion.

   Legal Proceedings. The State is involved in certain legal proceedings
(described in the State's recent financial statements) that, if decided against
the State, may require the State to make significant future expenditures or may
substantially impair revenues. In January of 1997, California experienced major
flooding in six different areas with current estimates of property damage to be
approximately $1.6 to $2 billion. One lawsuit has been filed by 500 homeowners
and more lawsuits are expected. Exposure from all of the anticipated cases
arising from these floods could total approximately $2 billion.

   The primary government is a defendant in Ceridian Corporation v. Franchise
Tax Board, a suit which challenges the validity of two sections of the
California tax laws. The first relates to deduction from corporate taxes for
dividends received fro insurance companies to the extent the insurance companies
have California activities. The second relates to corporate deduction of
dividends to the extent the earnings of the dividend paying corporation have
already been included in the measure of their California tax. If both sections
of the California Tax law are invalidated, and all dividends become deductible,
then the General fund can become liable for approximately $200-$250 million
annually.

                          OBLIGATIONS OF OTHER ISSUERS

   Other Issuers of California Municipal Obligations. There are a number of
state agencies, instrumentalities and political subdivisions of the State that
issue Municipal Obligations, some of which may be conduit revenue obligations
payable from payments from private borrowers. These entities are subject to
various economic risks and uncertainties, and the credit quality of the
securities issued by them may vary considerably from the credit quality of the
obligations backed by the full faith and credit of the State.

   State Assistance. Property tax revenues received by local governments
declined more than 50% following passage of Proposition 13. Subsequently, the
California Legislature enacted measures to provide for the redistribution of the
State's General Fund surplus to local agencies, the reallocation of certain
State revenues to local agencies and the assumption of certain governmental
functions by the State to assist municipal issuers to raise revenues.

   To the extent the State should be constrained by its Article XIIIB
appropriations limit, or its obligation to conform to Proposition 98, or other
fiscal considerations, the absolute level, or the rate of growth, of State
assistance to local governments may be further reduced. Any such reductions in
State aid could compound the serious fiscal constraints already experienced by
many local governments, particularly counties. At least one rural county (Butte)
publicly announced that it might enter bankruptcy proceedings in August 1990,
although such plans were put off after the Governor approved legislation to
provide additional funds for the county. Other counties have also indicated that
their budgetary condition is extremely grave. The Richmond Unified School
District (Contra Costa County) entered bankruptcy proceedings in May 1991 but
the proceedings were dismissed. Los Angeles County, the largest in the State,
has reported severe fiscal problems, leading to a nominal $1.2 billion deficit
in its $11 billion budget for the 1995-96 fiscal year. To balance the budget,
the county imposed severe cuts in services, particularly for health care. The
Legislature is considering actions to help alleviate the County's fiscal
problems, but none were completed before August 15, 1995. As a result of its
bankruptcy proceedings (discussed further below) Orange County also implemented
stringent cuts in services and laid off workers.

   Assessment Bonds. California Municipal Obligations which are assessment bonds
may be adversely affected by a general decline in real estate values or a
slowdown in real estate sales activity. In many cases, such bonds are secured by
land which is undeveloped at the time of issuance but anticipated to be
developed within a few years after issuance. In the event of such reduction or
slowdown, such development may not occur or may be delayed, thereby increasing
the risk of a default on the bonds. Because the special assessments or taxes
securing these bonds are not the personal liability of the owners of the
property assessed, the lien on the property is the only security for the bonds.
Moreover, in most cases the issuer of these bonds is not required to make
payments on the bonds in the event of delinquency in the payment of assessments
or taxes, except from amounts, if any, in a reserve fund established for the
bonds.

   California Long-Term Lease Obligations. Certain California long-term lease
obligations, though typically payable from the general fund of the municipality,
are subject to "abatement" in the event the facility being leased is unavailable
for beneficial use and occupancy by the municipality during the term of the
lease. Abatement is not a default, and there may be no remedies available to the
holders of the certificates evidencing the lease obligation in the event
abatement occurs. The most common cases of abatement are failure to complete
construction of the facility before the end of the period during which lease
payments have been capitalized and uninsured casualty losses to the facility
(e.g., due to earthquake). In the event abatement occurs with respect to a lease
obligation, lease payments may be interrupted (if all available insurance
proceeds and reserves are exhausted) and the certificates may not be paid when
due.

   Several years ago, the Richmond Unified School District (the "District")
entered into a lease transaction in which certain existing properties of the
District were sold and leased back in order to obtain funds to cover operating
deficits. Following a fiscal crisis in which the District's finances were taken
over by a State receiver (including a brief period under bankruptcy court
protection), the District failed to make rental payments on this lease,
resulting in a lawsuit by the Trustee for the Certificate of Participation
holders, in which the State was named defendant (on the grounds that it
controlled the District's finances). One of the defenses raised in answer to
this lawsuit was the invalidity of the District's lease. The trial court has
upheld the validity of the lease and the case has been settled. Any judgment in
a future case against the position asserted by the Trustee in the Richmond case
may have adverse implications for lease transactions of a similar nature by
other California entities.

   Other Considerations. The repayment of industrial development securities
secured by real property may be affected by California laws limiting foreclosure
rights of creditors. Securities backed by health care and hospital revenues may
be affected by changes in State regulations governing cost reimbursements to
health care providers under Medi-Cal (the State's Medicaid program), including
risks related to the policy of awarding exclusive contracts to certain
hospitals.

   Limitations on ad valorem property taxes may particularly affect "tax
allocation" bonds issued by California redevelopment agencies. Such bonds are
secured solely by the increase in assessed valuation of a redevelopment project
area after the start of redevelopment activity. In the event that assessed
values in the redevelopment project decline (e.g., because of a major natural
disaster such as an earthquake), the tax increment revenue may be insufficient
to make principal and interest payments on these bonds. Both Moody's and S&P
suspended ratings on California tax allocation bonds after the enactment of
Articles XIIIA and XIIIB, and only resumed such ratings on a selective basis.

   Proposition 87, approved by California voters in 1988, requires that all
revenues produced by a tax rate increase go directly to the taxing entity which
increased such tax rate to repay that entity's general obligation indebtedness.
As a result, redevelopment agencies (which, typically, are the issuers of tax
allocation securities) no longer receive an increase in tax increment when taxes
on property in the project area are increased to repay voter-approved bonded
indebtedness.

   The effect of these various constitutional and statutory changes upon the
ability of California municipal securities issuers to pay interest and principal
on their obligations remains unclear. Furthermore, other measures affecting the
taxing or spending authority of California or its political subdivisions may be
approved or enacted in the future. Legislation has been or may be introduced
which would modify existing taxes or other revenue-raising measures or which
either would further limit or, alternatively, would increase the abilities of
state and local governments to impose new taxes or increase existing taxes. It
is not presently possible to predict the extent to which any such legislation
will be enacted. Nor is it presently possible to determine the impact of any
such legislation on California Municipal Obligations in which the Fund may
invest, future allocations of state revenues to local governments or the
abilities of state or local governments to pay the interest on, or repay the
principal of, such California Municipal Obligations.

   Substantially all of California is within an active geologic region subject
to major seismic activity. Northern California, in 1989, and southern
California, in 1994, experienced major earthquakes causing billions of dollars
in damages. The federal government provided more than $13 billion in aid for
both earthquakes, and neither event is expected to have any long-term negative
economic impact. Any California Municipal Obligation in a California Trust could
be affected by an interruption of revenues because of damaged facilities, or,
consequently, income tax deductions for casualty losses or property tax
assessment reductions. Compensatory financial assistance could be constrained by
the inability of (i) an issuer to have obtained earthquake insurance coverage at
reasonable rates; (ii) an insurer to perform on its contracts of insurance in
the event of widespread losses; or (iii) the Federal or State government to
appropriate sufficient funds within their respective budget limitations.

   On December 7, 1994, Orange County, California (the "County"), together with
its pooled investment fund (the "County Pooled Fund") filed for protection under
Chapter 9 of the federal Bankruptcy Code, after reports that the County Pooled
Fund had suffered significant market losses in its investments caused a
liquidity crisis for the County Pooled Fund and the County. More than 180 other
public entities, most but not all located in the County, were depositors in the
County Pooled Fund. As of mid-January 1995, the County estimated that the County
Pooled Fund had lost about $1.64 billion, or 23%, of its initial deposits of
around $7.5 billion. The Pooled Fund has been almost completely restructured to
reduce its exposure to changes in County interest rates. Many of the entities
which kept moneys in the County Pooled Fund, including the County, faced cash
flow difficulties because of the bankruptcy filing and may be required to reduce
programs or capital projects. The County and some of these entities have, and
others may in the future, default in payment of their obligations. At that time,
Moody's and Standard & Poor's suspended, reduced to below investment grade
levels, or placed on "Credit Watch" various securities of the County and the
entities participating in the Pooled Fund.

   The State of California has no obligation with respect to any obligations or
securities of the County or any of the other participating entities, although
under existing legal precedents, the State may be obligated to ensure that
school districts have sufficient funds to operate.

                              Michigan Risk Factors

   Investors should be aware that the economy of the State of Michigan has, in
the past, proven to be cyclical, due primarily to the fact that the leading
sector of the State's economy is the manufacturing of durable goods. While the
State's efforts to diversify its economy have proven successful, as reflected by
the fact that the share of employment in the State in the durable goods sector
has fallen from 33.1 percent in 1960 to 17.9 percent in 1990 and to 15.2 percent
in 1997, durable goods manufacturing still represents a sizable portion of the
State's economy. As a result, any substantial national economic downturn is
likely to have an adverse effect on the economy of the State and on the revenues
of the State and some of its local governmental units.

   In July 1995, Moody's Investors Service, Inc. raised the State's general
obligation bond rating to "Aa". In January 1998, Standard & Poor's raised its
rating on the State's general obligation bonds to "AA+". In April, 1998, Fitch
IBCA, Inc., raised its rating on the State's general obligation bonds to AA+.

   The State's economy could continue to be affected by changes in the auto
industry, notably consolidation and plant closings resulting from competitive
pressures and over-capacity. Such actions could adversely affect State revenues
and the financial impact on the local units of government in the areas in which
plants are closed could be more severe. In addition, as described in the State's
comprehensive annual financial report on file with the Nationally Recognized
Municipal Securities Information Repositories, the State is party to a number of
lawsuits and legal actions, some of which, if determined adversely to the State,
could have a materially adverse impact on the State's finances.

   In recent years, the State of Michigan has reported its financial results in
accordance with generally accepted accounting principles. For each of the last
five fiscal years, the State ended the fiscal year with its General Fund in
balance after transfers in most of those years from the General Fund to the
Budget Stabilization Fund. The balance in the Budget Stabilization Fund was
$1.15 billion as of September 30, 1997, including a reserve of $572.6 million
for educational expenses described in the next paragraph. In all but one of the
last five fiscal years, the State has borrowed between $500 million and $900
million for cash flow purposes. It borrowed $900 million in each of the 1996,
1997 and 1998 fiscal years.

   In November of 1997, the State Legislature adopted legislation to provide for
the funding of claims of local school districts, some of whom had alleged in a
lawsuit, Durant v. State of Michigan, that the State had, over a period of
years, paid less in school aid than required by the State's Constitution. Under
this legislation, the State paid to school districts which were plaintiffs in
the suit approximately $212 million from the Budget Stabilization Fund on April
15, 1998, and will be required to pay to other school districts from the Budget
Stabilization Fund (i) an additional $32 million per year in the years 1998-99
through 2007-08, and (ii) up to an additional $40 million per year in the years
1998-99 through 2012-13.

   The Michigan Constitution of 1963 limits the amount of total revenues of the
State raised from taxes and certain other sources to a level for each fiscal
year equal to a percentage of the State's personal income for the prior calendar
year. In the event that the State's total revenues exceed the limit by 1 percent
or more, the Michigan Constitution of 1963 requires that the excess be refunded
to taxpayers. In order to comply with this requirement, the State refunded
approximately $113 million through income tax credits for the 1995 calendar
year.
   On March 15, 1994, Michigan voters approved a school finance reform amendment
to the State's Constitution which, among other things, increased the State sales
tax rate from 4% to 6% and placed a cap on property assessment increases for all
property taxes. Concurrent legislation cut the State's income tax rate from 4.6%
to 4.4%, reduced some property taxes and altered local school funding sources to
a combination of property taxes and state revenues, some of which is provided
from other new or increased State taxes. The legislation also contained other
provisions that alter (and, in some cases, may reduce) the revenues of local
units of government, and tax increment bonds could be particularly affected.
While the ultimate impact of the constitutional amendment and related
legislation cannot yet be accurately predicted, investors should be alert to the
potential effect of such measures upon the operations and revenues of Michigan
local units of government.

   In addition, the State Legislature in 1995 recently adopted a package of
state tax cuts, including a phase out of the intangibles tax, an increase in
exemption amounts for personal income tax, and reductions in single business
tax.

   Although all or most of the Bonds in the Michigan IM-IT Trust are revenue
obligations or general obligations of local governments or authorities rather
than general obligations of the State of Michigan itself, there can be no
assurance that any financial difficulties the State may experience will not
adversely affect the market value or marketability of the Bonds or the ability
of the respective obligors to pay interest on or principal of the Bonds,
particularly in view of the dependency of local governments and other
authorities upon State aid and reimbursement programs and, in the case of bonds
issued by the State Building Authority, the dependency of the State Building
Authority on the receipt of rental payments from the State to meet debt service
requirements upon such bonds. In the 1991 fiscal year, the State deferred
certain scheduled cash payments to municipalities, school districts,
universities and community colleges. While such deferrals were made up at
specified later dates, similar future deferrals could have an adverse impact on
the cash position of some local governmental units. Additionally, while total
State revenue sharing payments have increased in each of the last five years,
the State did reduce revenue sharing payments to municipalities below that level
otherwise provided under formulas in each of those years.

   The Michigan IM-IT Trust may contain general obligation bonds of local units
of government pledging the full faith and credit of the local unit which are
payable from the levy of ad valorem taxes on taxable property within the
jurisdiction of the local unit. Such bonds issued prior to December 22, 1978, or
issued after December 22, 1978 with the approval of the electors of the local
unit, are payable from property taxes levied without limitation as to rate or
amount. With respect to bonds issued after December 22, 1978, and which were not
approved by the electors of the local unit, the tax levy of the local unit for
debt service purposes is subject to constitutional, statutory and charter tax
rate limitations. In addition, several major industrial corporations have
instituted challenges of their ad valorem property tax assessments in a number
of local municipal units in the State. If successful, such challenges could have
an adverse impact on the ad valorem tax bases of such units which could
adversely affect their ability to raise funds for operation and debt service
requirements.

                             NEW JERSEY RISK FACTORS

   The New Jersey IM-IT Trust consists of a portfolio of Bonds. The Trust is
therefore susceptible to political, economic or regulatory factors affecting
issuers of the Bonds. The following information provides only a brief summary of
some of the complex factors affecting the financial situation in New Jersey (the
"State") and is derived from sources that are generally available to investors
and is believed to be accurate. It is based in part on information obtained from
various State and local agencies in New Jersey. No independent verification has
been made of any of the following information.
   New Jersey is the ninth largest state in population and the fifth smallest in
land area. With an average of 1,071 people per square mile, it is the most
densely populated of all the states. The State's economic base is diversified,
consisting of a variety of manufacturing, construction and service industries,
supplemented by rural areas with selective commercial agriculture. Historically,
New Jersey's average per capita income has been well above the national average,
and in 1995, the State ranked second among the states in per capita personal
income ($29,248).

   The New Jersey Economic Policy Council, a statutory arm of the New Jersey
Department of Commerce and Economic Development, has reported in New Jersey
Economic Indicators, a monthly publication of the New Jersey Department of
Labor, Division of Labor Market and Demographic Research, that in 1988 and 1989,
employment in New Jersey's manufacturing sector failed to benefit from the
export boom experienced by many Midwest states and the State's service sectors,
which had fueled the State's prosperity since 1982, lost momentum. In the
meantime, the prolonged fast growth in the State in the mid 1980s resulted in a
tight labor market situation, which has led to relatively high wages and housing
prices. This means that, while the incomes of New Jersey residents are
relatively high, the State's business sector has become more vulnerable to
competitive pressures.

   The onset of the national recession (which officially began in July 1990
according to the National Bureau of Economic Research) caused an acceleration of
New Jersey's job losses in construction and manufacturing. In addition, the
national recession caused an employment downturn in such previously growing
sectors as wholesale trade, retail trade, finance, utilities and trucking and
warehousing. Reflecting the downturn, the rate of unemployment in the State rose
from a low of 3.6% during the first quarter of 1989 to an estimated 4.9% in
December 1997, which is higher than the national average of 4.6% in December
1997. Economic recovery is likely to be slow and uneven in New Jersey, with
unemployment receding at a correspondingly slow pace, due to the fact that some
sectors may lag due to continued excess capacity. In addition, employers even in
rebounding sectors can be expected to remain cautious about hiring until they
become convinced that improved business will be sustained. Also, certain firms
will continue to merge or downsize to increase profitability.

   Debt Service. The primary method for State financing of capital projects is
through the sale of the general obligation bonds of the State. These bonds are
backed by the full faith and credit of the State tax revenues and certain other
fees are pledged to meet the principal and interest payments and if provided,
redemption premium payments, if any, required to repay the bonds. As of June 30,
1996, there was a total authorized bond indebtedness of approximately $10.31
billion, of which $3.69 billion was issued and outstanding, $4.76 billion was
retired (including bonds for which provision for payment has been made through
the sale and issuance of refunding bonds) and $1.86 billion was unissued. The
appropriation for the debt service obligation on such outstanding indebtedness
is $446.9 million for Fiscal Year 1997.

   New Jersey's Budget and Appropriation System. The State operates on a fiscal
year beginning July 1 and ending June 30. At the end of Fiscal Year 1993, there
was a surplus in the State's general fund (the fund into which all State
revenues not otherwise restricted by statute are deposited and from which
appropriations are made) of $937.4 million. At the end of Fiscal Year 1994,
there was a surplus in the general fund of $926.0 million. At the end of Fiscal
Year 1995, there was a surplus in the general fund of $569.2 million. It is
estimated that New Jersey closed its Fiscal Year 1996 with a surplus of $442
million and Fiscal Year 1997 with a surplus of $276.2 million.

   In order to provide additional revenues to balance future budgets, to
redistribute school aid and to contain real property taxes, on June 27, 1990,
and July 12, 1990, Governor Florio signed into law legislation which was
estimated to raise approximately $2.8 billion in additional taxes (consisting of
$1.5 billion in sales and use taxes and $1.3 billion in income taxes), the
biggest tax hike in New Jersey history. There can be no assurance that receipts
and collections of such taxes will meet such estimates.

   The first part of the tax hike took effect on July 1, 1990, with the increase
in the State's sales and use tax rate from 6% to 7% and the elimination of
exemptions for certain products and services not previously subject to the tax,
such as telephone calls, paper products (which has since been reinstated), soaps
and detergents, janitorial services, alcoholic beverages and cigarettes. At the
time of enactment, it was projected that these taxes would raise approximately
$1.5 billion in additional revenue. Projections and estimates of receipts from
sales and use taxes, however, have been subject to variance in recent fiscal
years.

   The second part of the tax hike took effect on January 1, 1991, in the form
of an increased state income tax on individuals. At the time of enactment, it
was projected that this increase would raise approximately $1.3 billion in
additional income taxes to fund a new school aid formula, a new homestead rebate
program and state assumption of welfare and social services costs. Projections
and estimates of receipts from income taxes, however, have also been subject to
variance in recent fiscal years. Under the legislation, income tax rates
increased from their previous range of 2% to 3.5% to a new range of 2% to 7%,
with the higher rates applying to married couples with incomes exceeding $70,000
who file joint returns, and to individuals filing single returns with incomes of
more than $35,000.

   The Florio administration had contended that the income tax package will help
reduce local property tax increases by providing more state aid to
municipalities. Under the income tax legislation, the State will assume
approximately $289 million in social services costs that previously were paid by
counties and municipalities and funded by property taxes. In addition, under the
new formula for funding school aid, an extra $1.1 billion is proposed to be sent
by the State to school districts beginning in 1991, thus reducing the need for
property tax increases to support education programs.

   Effective July 1, 1992, the State's sales and use tax rate decreased from 7%
to 6%. Effective January 1, 1994, an across-the-board 5% reduction in the income
tax rates was enacted and effective January 1, 1995, further reductions ranging
from 1% up to 10% in income tax rates took effect. Governor Whitman recently
signed into law further reductions up to 15% for some taxpayers effective
January 1, 1996, completing her campaign promise to reduce income taxes by up to
30% within three years for most taxpayers.

   In June 1997, Governor Whitman signed the New Jersey Legislature's $16.8
billion budget for Fiscal Year 1998. The balanced budget, which includes $442
million in surplus, is $800 million more than the 1997 budget. Whether the State
can achieve a balanced budget depends on its ability to enact and implement
expenditure reductions and to collect estimated tax revenues.

   Litigation. The State is a party in numerous legal proceedings pertaining to
matters incidental to the performance of routine governmental operations. Such
litigation includes, but is not limited to, claims asserted against the State
arising from alleged torts, alleged breaches of contracts, condemnation
proceedings and other alleged violations of State and Federal laws. Included in
the State's outstanding litigation are cases challenging the following: the
funding of teachers' pension funds; the hospital assessment authorized by the
Health Care Reform Act of 1992; the State's role in a consent order concerning
the construction of a resource facility in Passaic County; the State's actions
regarding alleged chromium contamination of State-owned property in Hudson
County; the constitutionality of annual A-901 hazardous and solid waste
licensure renewal fees collected by the Department of Environmental Protection
and Energy; the State's funding formula that attempts to close the spending gap
between poor urban school districts and wealthy suburban districts; the use by
the State of assessments on certain insurers to retire debt of the Market
Transition Fund, the manner in which mental health services are provided to
inmates with serious mental disorders who are confined within the facilities of
the Department of Corrections; the spousal impoverishment provisions of the
Medicare Catastrophic Coverage Act; Medicaid hospital reimbursements since
February, 1995; and the efforts to revitalize Atlantic City through the design
and construction of a highway and tunnel. Adverse judgments in these and other
matters could have the potential for either a significant loss of revenue or a
significant unanticipated expenditure by the State.

   At any given time, there are various numbers of claims and cases pending
against the State, State agencies and employees, seeking recovery of monetary
damages that are primarily paid out of the fund created pursuant to the New
Jersey Tort Claims Act. In addition, at any given time, there are various
numbers of contract claims against the State and State agencies seeking recovery
of monetary damages. The State is unable to estimate its exposure for these
claims.

   Debt Ratings. For many years prior to 1991, both Moody's Investors Service,
Inc. and Standard and Poor's Corporation had rated New Jersey general obligation
bonds "Aaa" and "AAA," respectively. On July 3, 1991, however, Standard and
Poor's Corporation downgraded New Jersey general obligation bonds to "AA+." On
June 4, 1992, Standard and Poor's Corporation placed New Jersey general
obligation bonds on CreditWatch with negative implications, citing as its
principal reason for its caution the unexpected denial by the Federal Government
of New Jersey's request for $450 million in retroactive Medicaid payments for
psychiatric hospitals. These funds were critical to closing a $1 billion gap in
the State's $15 billion budget for fiscal year 1992 which ended on June 30,
1992. Under New Jersey state law, the gap in the current budget must be closed
before the new budget year began on July 1, 1992. Standard and Poor's
Corporation suggested the State could close fiscal 1992's budget gap and help
fill fiscal 1993's hole by a reversion of $700 million of pension contributions
to its general fund under a proposal to change the way the State calculates its
pension liability. On July 6, 1992, Standard and Poor's Corporation reaffirmed
its "AA+" rating for New Jersey general obligation bonds and removed the debt
from its CreditWatch list, although it stated that New Jersey's long-term
financial outlook was negative. Standard & Poor's Corporation was concerned that
the State was entering the 1993 fiscal year that began July 1, 1992, with a slim
$26 million surplus and remained concerned about whether the sagging State
economy would recover quickly enough to meet lawmakers' revenue projections. It
also remained concerned about the recent federal ruling leaving in doubt how
much the State was due in retroactive Medicaid reimbursements and a ruling by a
federal judge, now on appeal, of the State's method for paying for uninsured
hospital patients. However, on July 27, 1994, S&P announced that it was changing
the State's outlook from negative to stable due to a brightening of the State's
prospects as a result of Governor Whitman's effort to trim spending and cut
taxes, coupled with an improving economy. S&P reaffirmed its "AA+" rating at the
same time.

   On August 24, 1992, Moody's Investors Service, Inc. downgraded New Jersey
general obligation bonds to "Aa1," stating that the reduction reflected a
developing pattern of reliance on nonrecurring measures to achieve budgetary
balance, four years of financial operations marked by revenue shortfalls and
operating deficits, and the likelihood that serious financial pressures would
persist. On August 5, 1994, Moody's reaffirmed its "Aa1" rating, citing on the
positive side New Jersey's broad-based economy, high income levels, history of
maintaining a positive financial position and moderate (albeit rising) debt
ratios, and, on the negative side, a continued reliance on one-time revenues and
a dependence on pension-related savings to achieve budgetary balance.



                       ESTIMATED CASH FLOWS TO UNITHOLDERS

   The tables below set forth the per Unit estimated monthly and semi-annual
distributions of interest and principal to Unitholders. The tables assume no
changes in expenses, no changes in the current interest rates, no exchanges,
redemptions, sales or prepayments of the underlying Bonds prior to maturity or
expected retirement date and the receipt of principal upon maturity or expected
retirement date. To the extent the foregoing assumptions change actual
distributions will vary.

<TABLE>
<CAPTION>
   CALIFORNIA
      MONTHLY
                                                       Estimated                 Estimated               Estimated
               Distribution Dates                      Interest                  Principal                 Total
                  (Each Month)                       Distribution              Distribution            Distribution
      ------------------------------------           ------------              ------------            ------------
<S>                <C>                <C>                <C>                     <C>                     <C>    
      September    1998                                  $ 4.74                                          $  4.74
      October      1998  - June       2010                 3.85                                             3.85
      July         2010                                    3.70                  $116.90                  120.60
      August       2010  - January    2026                 3.35                                             3.35
      February     2026                                    3.35                    50.10                   53.45
      March        2026  - July       2027                 3.35                                             3.35
      August       2027                                    3.23                   100.20                  103.43
      September    2027                                    2.94                                             2.94
      October      2027                                    2.80                   116.90                  119.70
      November     2027  - April      2028                 2.46                                             2.46
      May          2028                                    2.25                   167.00                  169.25
      June         2028  - August     2028                 1.76                                             1.76
      September    2028                                    1.62                   116.90                  118.52
      October      2028  - November   2028                 1.28                                             1.28
      December     2028                                     .72                   167.00                  167.72
      January      2029  - January    2030                  .60                                              .60
      February     2030                                     .40                   167.00                  167.40

<CAPTION>
      SEMI-ANNUAL
               DISTRIBUTION DATES
                 (Each July and                        Estimated                 Estimated               Estimated
                 January Unless                        Interest                  Principal                 Total
              Otherwise Specified)                   Distribution              Distribution            Distribution
      ------------------------------------           ------------              ------------            ------------
<S>                <C>                <C>                <C>                     <C>                     <C>    
      January      1999                                  $20.36                                          $ 20.36
      July         1999  - January    2010                23.35                                            23.35
      July         2010                                   23.20                  $116.90                  140.10
      January      2011  - January    2026                20.38                                            20.38
      February     2026                                                            50.10                   50.10
      July         2026  - July       2027                20.38                                            20.38
      August       2027                                                           100.20                  100.20
      October      2027                                                           116.90                  116.90
      January      2028                                   16.58                                            16.58
      May          2028                                                           167.00                  167.00
      July         2028                                   13.35                                            13.35
      September    2028                                                           116.90                  116.90
      December     2028                                                           167.00                  167.00
      January      2029                                    7.39                                             7.39
      July         2029  - January    2030                 3.73                                             3.73
      February     2030                                     .41                   167.00                  167.41

<CAPTION>
   MICHIGAN
   MONTHLY
                                                       Estimated                 Estimated               Estimated
               Distribution Dates                      Interest                  Principal                 Total
                  (Each Month)                       Distribution              Distribution            Distribution
      ------------------------------------           ------------              ------------            ------------
<S>                <C>                <C>                <C>                     <C>                     <C>    
      September    1998                                  $ 4.72                                          $  4.72
      October      1998  - April      2007                 3.83                                             3.83
      May          2007                                    3.62                  $163.82                  167.44
      June         2007  - April      2020                 3.13                                             3.13
      May          2020                                    3.13                    49.15                   52.28
      June         2020  - November   2020                 3.13                                             3.13
      December     2020                                    2.91                   181.85                  184.76
      January      2021  - April      2024                 2.38                                             2.38
      May          2024                                    2.29                    81.91                   84.20
      June         2024  - April      2026                 2.05                                             2.05
      May          2026                                    2.01                    32.77                   34.78
      June         2026  - November   2027                 1.92                                             1.92
      December     2027                                    1.37                   163.82                  165.19
      January      2028  - April      2028                 1.26                                             1.26
      May          2028                                    1.16                    81.92                   83.08
      June         2028                                     .37                   163.82                  164.19
      July         2028  - September  2028                  .26                                              .26
      October      2028                                     .16                    81.92                   82.08

<CAPTION>
      SEMI-ANNUAL
               DISTRIBUTION DATES
                 (Each July and                        Estimated                 Estimated               Estimated
                 January Unless                        Interest                  Principal                 Total
              Otherwise Specified)                   Distribution              Distribution            Distribution
      ------------------------------------           ------------              ------------            ------------
<S>                <C>                <C>                <C>                     <C>                        <C>    
      January      1999                                  $20.27                                          $ 20.27
      July         1999  - January    2007                23.25                                            23.25
      May          2007                                                          $163.82                  163.82
      July         2007                                   21.63                                            21.63
      January      2008  - January    2020                19.04                                            19.04
      May          2020                                                            49.15                   49.15
      July         2020                                   19.04                                            19.04
      December     2020                                                           181.85                  181.85
      January      2021                                   18.07                                            18.07
      July         2021  - January    2024                14.50                                            14.50
      May          2024                                                            81.91                   81.91
      July         2024                                   13.74                                            13.74
      January      2025  - January    2026                12.50                                            12.50
      May          2026                                                            32.77                   32.77
      July         2026                                   12.20                                            12.20
      January      2027  - July       2027                11.70                                            11.70
      December     2027                                                           163.82                  163.82
      January      2028                                   10.48                                            10.48
      May          2028                                                            81.92                   81.92
      June         2028                                                           163.82                  163.82
      July         2028                                    5.69                                             5.69
      October      2028                                     .72                    81.92                   82.64
<CAPTION>
   NEW JERSEY
      MONTHLY
                                                       Estimated                 Estimated               Estimated
               Distribution Dates                      Interest                  Principal                 Total
                  (Each Month)                       Distribution              Distribution            Distribution
      ------------------------------------           ------------              ------------            ------------
<S>                <C>                <C>                <C>                     <C>                     <C>    
      September    1998                                  $ 4.71                                          $  4.71
      October      1998  - June       2008                 3.82                                             3.82
      July         2008                                    3.61                  $163.71                  167.32
      August       2008  - November   2009                 3.13                                             3.13
      December     2009                                    2.93                   163.72                  166.65
      January      2010  - June       2010                 2.44                                             2.44
      July         2010                                    1.87                   163.72                  165.59
      August       2010  - August     2022                 1.75                                             1.75
      September    2022                                    1.65                    81.86                   83.51
      October      2022  - June       2025                 1.42                                             1.42
      July         2025                                    1.22                   163.72                  164.94
      August       2025  - January    2026                  .76                                              .76
      February     2026                                     .76                    49.12                   49.88
      March        2026  - June       2028                  .76                                              .76
      July         2028                                     .62                   121.15                  121.77
      August       2028  - September  2032                  .28                                              .28
      October      2032                                     .17                    85.14                   85.31

<CAPTION>
      SEMI-ANNUAL
               DISTRIBUTION DATES
                 (Each July and                        Estimated                 Estimated               Estimated
                 January Unless                        Interest                  Principal                 Total
              Otherwise Specified)                   Distribution              Distribution            Distribution
      ------------------------------------           ------------              ------------            ------------
<S>                <C>                <C>                <C>                     <C>                     <C>    
      January      1999                                  $20.19                                          $ 20.19
      July         1999  - January    2008                23.16                                            23.16
      July         2008                                   22.95                  $163.71                  186.66
      January      2009  - July       2009                18.99                                            18.99
      December     2009                                                           163.72                  163.72
      January      2010                                   18.09                                            18.09
      July         2010                                   14.25                   163.72                  177.97
      January      2011  - July       2022                10.64                                            10.64
      September    2022                                                            81.86                   81.86
      January      2023                                    9.20                                             9.20
      July         2023  - January    2025                 8.64                                             8.64
      July         2025                                    8.44                   163.72                  172.16
      January      2026                                    4.64                                             4.64
      February     2026                                                            49.12                   49.12
      July         2026  - January    2028                 4.64                                             4.64
      July         2028                                    4.51                   121.15                  125.66
      January      2029  - July       2032                 1.70                                             1.70
      October      2032                                     .75                    85.14                   85.89
</TABLE>

                       Contents of Registration Statement
  
    This Amendment of Registration Statement comprises the following papers and
documents:

      The facing sheet and the Cross-Reference sheet
      The Prospectus and the signatures
      The consents of independent public accountants, ratings services
      and legal counsel

The following exhibits:

1.1 Copy of Trust Agreement.

1.4 Copy of municipal bond insurance policy (if applicable).

1.5 Form of Master Agreement Among Underwriters.  Reference is made  to
    Exhibit  1.5 to the Registration Statement on Form S-6 for Insured
    Municipals Income Trust, 228th Insured Multi-Series (File No. 333-
    36891) as filed on January 29, 1998.

3.1 Opinion  and consent of counsel as to legality of securities  being
    registered.

3.2 Opinion  of counsel as to the  Federal
    and California income tax status of securities being registered.

3.3 Opinion and consent of counsel as to New York income tax status  of
    the Fund under New York law.

3.4 Opinion  and consent of counsel as to income tax status to Michigan
    residents of Units of the Michigan IM-IT Trust.

3.5 Opinion  and  consent of counsel as to income  tax  status  to  New
    Jersey residents of Units of the New Jersey IM-IT Trust.

4.1 Consent of Interactive Data Corporation.

4.2 Consent of Standard & Poor's with respect to the Insured Trusts.

4.3 Consent of Grant Thornton LLP.

EX-27  Financial Data Schedules.

                                   Signatures
     
The Registrant, Insured Municipals Income Trust, 233rd Insured Multi- Series
hereby identifies Insured Municipals Income Trust and Investors' Quality
Tax-Exempt Trust, Multi Series 300, Insured Municipals Income Trust, 77th
Insured Multi-Series and Insured Municipals Income Trust and Investors' Quality
Tax-Exempt Trust, Multi-Series 189 for purposes of the representations required
by Rule 487 and represents the following: (1) that the portfolio securities
deposited in the series as to the securities of which this Registration
Statement is being filed do not differ materially in type or quality from those
deposited in such previous series; (2) that, except to the extent necessary to
identify the specific portfolio securities deposited in, and to provide
essential financial information for, the series with respect to the securities
of which this Registration Statement is being filed, this Registration Statement
does not contain disclosures that differ in any material respect from those
contained in the registration statements for such previous series as to which
the effective date was determined by the Commission or the staff; and (3) that
it has complied with Rule 460 under the Securities Act of 1933.
     
Pursuant to the requirements of the Securities Act of 1933, the Registrant,
Insured Municipals Income Trust, 233rd Insured Multi-Series has duly caused this
Amendment to the Registration Statement to be signed on its behalf by the
undersigned, thereunto duly authorized, in the City of Chicago and State of
Illinois on the 29th day of July, 1998.

                                    Insured Municipals Income Trust
                                      233rd Insured Multi-Series
                                    
                                    By Van Kampen Funds Inc.
                                    
                                    
                                    By Gina M. Costello
                                       Assistant Secretary
     
     Pursuant  to  the requirements of the Securities Act of  1933,  this
Amendment to the Registration Statement has been signed below on July 29,
1998  by the following persons who constitute a majority of the Board  of
Directors of Van Kampen Funds Inc.

 Signature                 Title

Don G. Powell       Chairman and Chief Executive  )
                      Officer                     )

John H. Zimmerman   President and Chief           )
                      Operating Officer           )

Ronald A. Nyberg    Executive Vice President and  )
                      General Counsel             )

William R. Rybak    Executive Vice President and  )
                      Chief Financial Officer     )

                    Gina M. Costello
                    (Attorney-in-fact*)

- -------------------------------------------------------------------------------
*    An executed copy of each of the related powers of attorney was filed
with  the  Securities  and Exchange Commission  in  connection  with  the
Registration Statement on Form S-6 of Van Kampen American Capital  Equity
Opportunity Trust, Series 64 (file No. 33-33087) and Van Kampen  American
Capital Equity Opportunity Trust, Series 87 (file No. 333-44581) and  the
same are incorporated herein by this reference.


                                                                     Exhibit 1.1
                                   
                     Insured Municipals Income Trust
                       233rd Insured Multi-Series
                                    
                             Trust Agreement
                                    
                                                    Dated:  July 29, 1998
     
    This Trust Agreement between Van Kampen Funds Inc., as Depositor, American
Portfolio Evaluation Services, a division of Van Kampen Investment Advisory
Corp., as Evaluator, and The Bank of New York, as Trustee, sets forth certain
provisions in full and incorporates other provisions by reference to the
document entitled "Standard Terms and Conditions of Trust, For Van Kampen
American Capital Distributors, Inc. Tax-Exempt Trust, Dated March 16, 1995"
(herein called the "Standard Terms and Conditions of Trust"), and such
provisions as are set forth in full and such provisions as are incorporated by
reference constitute a single instrument. All references herein to Articles and
Sections are to Articles and Sections of the Standard Terms and Conditions of
Trust.
                                    
                                    
                            Witnesseth That:
     
    In consideration of the premises and of the mutual agreements herein
contained, the Depositor and the Trustee agree as follows:
                                    
                                    
                                 Part I
                                    
                                    
                 Standard Terms and Conditions of Trust
     
    Subject to the provisions of Part II hereof, all the provisions contained in
the Standard Terms and Conditions of Trust are herein incorporated by reference
in their entirety and shall be deemed to be a part of this instrument as fully
and to the same extent as though said provisions had been set forth in full in
this instrument.
                                    
                                    
                                 Part II
                                    
                                    
                  Special Terms and Conditions of Trust
     
     The following special terms and conditions are hereby agreed to:
     
          (a)    The  Bonds  defined in Section 1.01(4),  listed  in  the
     Schedules hereto, have been deposited in the Trusts under this Trust
     Agreement.
     
          (b)   The fractional undivided interest in and ownership of the
     various  Trusts  represented by each Unit thereof  is  a  fractional
     amount,  the numerator of which is one and the denominator of  which
     is  the  amount  set  forth under "Summary  of  Essential  Financial
     Information__Number of Units" in the related Prospectus Part I.
     
          (c)    The approximate amounts, if any, which the Trustee shall
     be  required to advance out of its own funds and cause to be paid to
     the  Depositor pursuant to Section 3.05 shall be the amount per Unit
     that the Trustee agreed to reduce its fee or pay Trust expenses  set
     forth  in  the footnotes in the related Prospectus Part I times  the
     number  of  units in such Trust referred to in Part II (b)  of  this
     Trust Agreement.
     
         (d)   The First General Record Date and the amount of the second
     distribution of funds from the Interest Account of each Trust  shall
     be the record date for the Interest Account and the amount set forth
     under   "Summary   of   Essential  Financial   Information-Estimated
     Distributions - Initial Distribution" in the related Prospectus Part
     I.
     
          (e)   The First Settlement Date shall be the date set forth  in
     the footnotes to the "Summary of Essential Financial Information" in
     the related Prospectus Part I.
     
          (f)    Any monies held to purchase "when issued" bonds will  be
     held in noninterest bearing accounts.
     
          (g)    The  Evaluation Time for purpose of  sale,  purchase  or
     redemption  of  Units  shall be the close  of  the  New  York  Stock
     Exchange.
     
          (h)    As  set  forth  in Section 3.05, the  Record  Dates  and
     Distribution  Dates for each Trust are those dates set  forth  under
     "Summary    of   Essential   Financial   Information   -   Estimated
     Distributions" in the related Prospectus Part I.
     
          (i)    As  set  forth  in Section 3.15, the Evaluator's  Annual
     Supervisory  Fee  shall  be that amount set  forth  in  "Summary  of
     Essential   Financial  Information-Expenses-Evaluator's  Supervisory
     Fee" in Prospectus Part I.
     
          (j)    As  set  forth  in Section 4.03, the Evaluator's  Annual
     Evaluation Fee shall be that amount, and computed on that basis, set
     forth  in  "Summary  of  Essential  Financial  Information-Expenses-
     Evaluator's Evaluation Fee" in the related Prospectus Part I
     
          (k)    The  Trustee's annual compensation as  set  forth  under
     Section  6.04, under each distribution plan shall be that amount  as
     specified  in  the  related  Prospectus Part  I  under  the  section
     entitled   "Summary  of  Essential  Financial  Information-Expenses-
     Trustee's  Fee"  and  will include a fee to induce  the  Trustee  to
     advance funds to meet scheduled distributions.
     
          (l)   The sixth paragraph of Section 3.05 is hereby revoked and
     replaced by the following paragraph:
          
                      Unitholders   desiring   to   receive   semi-annual
          distributions and who purchase their Units prior to the  Record
          Date  for  the  second distribution under the monthly  plan  of
          distribution  may  elect  at the time of  purchase  to  receive
          distributions on a semi-annual basis by notice to the  Trustee.
          Such  notice  shall  be  effective with respect  to  subsequent
          distributions until changed by further notice to  the  Trustee.
          Unitholders  desiring to receive semi-annual distributions  and
          who purchase their Units prior to the Record Date for the first
          distribution  may  elect  at the time of  purchase  to  receive
          distributions on a semi-annual basis by notice to the  Trustee.
          Such  notice  shall  be  effective with respect  to  subsequent
          distributions until changed by further notice to  the  Trustee.
          Changes in the plan of distribution will become effective as of
          opening of business on the day after the next succeeding  semi-
          annual  Record Date and such distributions will continue  until
          further notice.
     
          (m)    Sections  8.02(d)  and 8.02(e) are  hereby  revoked  and
     replaced with the following:
          
               (d)    distribute  to each Unitholder of such  Trust  such
          holder's pro rata share of the balance of the Interest  Account
          of such Trust;
          
               (e)    distribute  to each Unitholder of such  Trust  such
          holder's pro rata share of the balance of the Principal Account
          of such Trust; and
     
          (n)    Section  1.01(1)  and (3) shall  be  replaced  in  their
     entirety by the following:
     
          (1)    "Depositor"  shall mean Van Kampen Funds  Inc.  and  its
     successors  in  interest, or any successor  depositor  appointed  as
     hereinafter provided.
     
          (3)    "Evaluator"  shall  mean American  Portfolio  Evaluation
     Services  (a division of Van Kampen Investment Advisory  Corp.)  and
     its successors in interest, or any successor evaluator appointed  as
     hereinafter provided.
     
         In Witness Whereof, Van Kampen Funds Inc. has caused this Trust
Agreement to be executed by one of its Vice Presidents or Assistant Vice
Presidents and its corporate seal to be hereto affixed and attested by its
Secretary or one of its Vice Presidents or Assistant Secretaries, American
Portfolio Evaluation Services, a division of Van Kampen Investment Advisory
Corp., has caused this Trust Indenture and Agreement to be executed by its
President or one of its Vice Presidents and its corporate seal to be hereto
affixed and attested to by its Secretary, its Assistant Secretary or one of its
Assistant Vice Presidents and The Bank of New York, has caused this Trust
Agreement to be executed by one of its Vice Presidents and its corporate seal to
be hereto affixed and attested to by one of its Vice Presidents, Assistant Vice
Presidents or Assistant Treasurers; all as of the day, month and year first
above written.

                                    Van Kampen Funds Inc.
                                    
                                    By  James J. Boyne
                                        Vice President, Associate General
                                        Counsel and Assistant Secretary

(Seal)
Attest:

By  Nicholas Dalmaso
    Assistant Secretary

                                    American Portfolio Evaluation
                                       Service, a division of Van Kampen
                                       Investment Advisory Corp.
                                    
                                    By  James J. Boyne
                                        President

(Seal)
Attest:

By  Nicholas Dalmaso
    Assistant Secretary

                                    The Bank Of New York
                                    
                                    By  Jeffrey Cohen
                                        Vice President

(Seal)
Attest:

By  Robert Weir
    Assistant Treasurer

                      Schedules to Trust Agreement
                                    
                     Securities Initially Deposited
                                    
       Insured Municipals Income Trust, 233rd Insured Multi-Series

(Note:   Incorporated  herein and made a part hereof as  indicated  below
         are  the corresponding "Portfolio" of each of the Trusts as  set
         forth in the related Prospectus Part I.)


                           Chapman and Cutler
                         111 West Monroe Street
                        Chicago, Illinois  60603
                                    
                              July 29, 1998
                                    
Van Kampen Funds Inc.
One Parkview Plaza
Oakbrook Terrace, Illinois  60181

     Re:  Insured Municipals Income Trust, 233rd Insured Multi-Series

Gentlemen:
     
     We  have served as counsel for Van Kampen Funds Inc., as Sponsor and
Depositor  of Insured Municipals Income Trust, 233rd Insured Multi-Series
(hereinafter  referred  to  as  the  "Fund"),  in  connection  with   the
preparation, execution and delivery of a Trust Agreement dated  July  29,
1998  between  Van  Kampen Funds Inc., as Depositor,  American  Portfolio
Evaluation Services, a division of Van Kampen Investment Advisory  Corp.,
as Evaluator, and The Bank of New York, as Trustee, pursuant to which the
Depositor has delivered to and deposited Bonds listed in the Schedules to
the  Trust  Agreement with the Trustee and pursuant to which the  Trustee
has  issued  to  or  on  the  order of the  Depositor  a  certificate  or
certificates representing Units of fractional undivided interest  in  and
ownership of the several Trusts of said Fund (hereinafter referred to  as
the "Units") created under said Trust Agreement.
     
     In connection therewith, we have examined such pertinent records and
documents  and  matters of law as we have deemed necessary  in  order  to
enable us to express the opinions hereinafter set forth.
     
     Based upon the foregoing, we are of the opinion that:
     
           1.   The execution and delivery of the Trust Agreement and the
     execution and issuance of certificates evidencing the Units  in  the
     several Trusts of the Fund have been duly authorized; and
     
           2.    The  certificates evidencing the Units  in  the  several
     Trusts of the Fund when duly executed and delivered by the Depositor
     and   the  Trustee  in  accordance  with  the  aforementioned  Trust
     Agreement,  will  constitute valid and binding obligations  of  such
     Trusts and the Depositor in accordance with the terms thereof.
     
     We hereby consent to the filing of this opinion as an exhibit to the
Registration  Statement  (File  No.  333-45259)  relating  to  the  Units
referred to above and to the use of our name and to the reference to  our
firm in said Registration Statement and in the related Prospectus.

                                    Respectfully submitted,

                                    Chapman and Cutler

                               Chapman and Cutler
                             111 West Monroe Street
                             Chicago, Illinois 60603

                                  July 29, 1998

Van Kampen Funds Inc.
One Parkview Plaza
Oakbrook Terrace, Illinois  60181

The Bank of New York
101 Barclay Street
New York, New York 10286

     Re:  Insured Municipals Income Trust, 233rd Insured Multi-Series

Gentlemen:
     
     We  have  acted as counsel for Van Kampen Funds Inc.,  Depositor  of
Insured Municipals Income Trust, 233rd Insured Multi-Series (the "Fund"),
in connection with the issuance of Units of fractional undivided interest
in the several trusts of said Fund (the "Trusts") under a Trust Agreement
dated  July 29, 1998 (the "Indenture") between Van Kampen Funds Inc.,  as
Depositor,  American Portfolio Evaluation Services,  a  division  of  Van
Kampen Investment Advisory Corp., as Evaluator, and The Bank of New York,
as Trustee.
     
     In this connection, we have examined the Registration Statement, the
form  of Prospectus proposed to be filed with the Securities and Exchange
Commission, the Indenture and such other instruments and documents as  we
have  deemed  pertinent.  For purposes of the following opinions,  it  is
assumed  that each asset of the Trusts is debt the interest on  which  is
excluded from gross income for federal income tax purposes.
     
       Based upon the foregoing and upon an investigation of such matters
of law as we consider to be applicable, we are of the opinion that, under
existing Federal income tax law:
     
          (i)   Each Trust is not an association taxable as a corporation
     but will be governed by the provisions of subchapter J (relating  to
     trusts) of Chapter 1, Internal Revenue Code of 1986 (the "Code").
     
         (ii)    Each Unitholder will be considered as owning a pro  rata
     share  of each asset of the respective Trust in the proportion  that
     the  number  of Units of such Trust held by him bears to  the  total
     number  of  Units  outstanding  of such  Trust.   Under  Subpart  E,
     Subchapter J of Chapter 1 of the Code, income of each Trust will  be
     treated as income of each Unitholder of the respective Trust in  the
     proportion described, and an item of Trust income will have the same
     character in the hands of a Unitholder as it would have in the hands
     of  the  Trustee.  Accordingly, to the extent that the income  of  a
     Trust  consists  of interest and original issue discount  excludable
     from gross income under Section 103 of the Code, such income will be
     excludable from Federal gross income of the Unitholders,  except  in
     the  case  of  a Unitholder who is a substantial user (or  a  person
     related to such user) of a facility financed through issuance of any
     industrial development bonds or certain private activity bonds  held
     by  the respective Trust.  In the case of such Unitholder who  is  a
     substantial  user (and no other) interest received with  respect  to
     his  Units attributable to such industrial development bonds or such
     private  activity bonds is includable in his gross income.   In  the
     case  of certain corporations, interest on the Bonds is included  in
     computing the alternative minimum tax pursuant to Section  56(c)  of
     the  Code, and the branch profits tax imposed by Section 884 of  the
     Code with respect to U.S. branches of foreign corporations.
     
        (iii)    Gain  or  loss will be recognized to a  Unitholder  upon
     redemption  or sale of his Units.  Such gain or loss is measured  by
     comparing the proceeds of such redemption or sale with the  adjusted
     basis  of  the Units represented by his Certificate.  If a  Bond  is
     acquired  with accrued interest, that portion of the price paid  for
     the  accrued interest is added to the tax basis of the  Bond.   When
     this  accrued  interest is received, it is treated as  a  return  of
     capital  and  reduces  the tax basis of the  Bond.   If  a  Bond  is
     purchased for a premium, the amount of the premium is added  to  the
     tax basis of the Bond.  Bond premium is amortized over the remaining
     term of the Bond, and the tax basis of the Bond is reduced each  tax
     year  by  the  amount of the premium amortized  in  that  tax  year.
     Accordingly,  Unitholders must reduce the tax basis of  their  Units
     for  their  share  of accrued interest received  by  the  respective
     Trust,  if  any,  on Bonds delivered after the Unitholders  pay  for
     their  Units to the extent that such interest accrued on such  Bonds
     before  the date the Trust acquired ownership of the Bonds (and  the
     amount  of this reduction may exceed the amount of accrued  interest
     paid to the seller) and, consequently, such Unitholders may have  an
     increase  in  taxable  gain or reduction in capital  loss  upon  the
     disposition  of  such  Units.   In  addition,  such  basis  will  be
     increased by the Unitholder's aliquot share of the accrued  original
     issue  discount  (and market discount, if the Unitholder  elects  to
     include  market  discount in income as it accrues) with  respect  to
     each Bond held by the Trust with respect to which there was original
     issue  discount  at  the  time the Bond was  issued  (or  which  was
     purchased   with  market  discount)  and  reduced  by   the   annual
     amortization of bond premium, if any, on Bonds held by the Trust.
     
        (iv)   If the Trustee disposes of a Trust asset (whether by sale,
     payment  on  maturity,  redemption or otherwise)  gain  or  loss  is
     recognized  to the Unitholder and the amount thereof is measured  by
     comparing the Unitholder's aliquot share of the total proceeds  from
     the  transaction with his basis for his fractional interest  in  the
     asset  disposed  of.  Such basis is ascertained by apportioning  the
     tax  basis for his Units among each of the Trust assets (as  of  the
     date  on  which his Units were acquired) ratably according to  their
     values  as  of  the  valuation date nearest the  date  on  which  he
     purchased such Units.  A Unitholder's basis in his Units and of  his
     fractional  interest  in each Trust asset must  be  reduced  by  the
     amount  of  his  aliquot share of accrued interest received  by  the
     Trust,  if  any,  on Bonds delivered after the Unitholders  pay  for
     their  Units to the extent that such interest accrued on  the  Bonds
     before  the date the Trust acquired ownership of the Bonds (and  the
     amount  of this reduction may exceed the amount of accrued  interest
     paid  to the seller), must be reduced by the annual amortization  of
     bond  premium,  if  any,  on Bonds held by the  Trust  and  must  be
     increased  by  the Unitholder's share of the accrued original  issue
     discount  (and market discount, if the Unitholder elects to  include
     market  discount in income as it accrues) with respect to each  Bond
     which,  at the time the Bond was issued, had original issue discount
     (or which was purchased with market discount).
     
          (v)    In  the  case of any Bond held by the  Trust  where  the
     "stated  redemption  price at maturity" exceeds the  "issue  price,"
     such  excess shall be original issue discount.  With respect to each
     Unitholder,  upon  the  purchase of  his  Units  subsequent  to  the
     original issuance of Bonds held by the Trust, Section 1272(a)(7)  of
     the Code provides for a reduction in the accrued "daily portion"  of
     such  original issue discount upon the purchase of a Bond subsequent
     to  the Bond's original issue, under certain circumstances.  In  the
     case  of  any  Bond  held  by the Trust the  interest  on  which  is
     excludable  from  gross income under Section 103 of  the  Code,  any
     original issue discount which accrues with respect thereto  will  be
     treated  as  interest which is excludable from  gross  income  under
     Section 103 of the Code.
     
         (vi)   We have examined the Municipal Bond Unit Investment Trust
     Insurance Policies, if any, issued to certain of the Trusts  on  the
     Date  of  Deposit by AMBAC Assurance Corporation, Financial Guaranty
     Insurance  Corporation or a combination thereof.  Each such  policy,
     or  a  combination of such policies, insures all bonds held  by  the
     Trustee  for  that particular Trust (other than bonds  described  in
     paragraph  (vii)) against default in the prompt payment of principal
     and  interest.   In  our opinion, any amount paid  under  each  said
     policy, or a combination of said policies, which represents maturing
     interest  on  defaulted  obligations held by  the  Trustee  will  be
     excludable from Federal gross income if, and to the same extent  as,
     such interest would have been so excludable if paid in normal course
     by the issuer of the defaulted Bonds provided that, at the time such
     policies  are  purchased, the amounts paid  for  such  policies  are
     reasonable, customary and consistent with the reasonable expectation
     that the issuer of the Bonds, rather than the insurer, will pay debt
     service on the Bonds.  Paragraph (ii) of this opinion is accordingly
     applicable to insurance proceeds representing maturing interest.
     
        (vii)    Certain Bonds in the portfolios of certain of the Trusts
     have  been  insured by the issuers thereof against  default  in  the
     prompt  payment  of  principal and interest (the  "Insured  Bonds").
     Insurance has been obtained for such Insured Bonds, or, in the  case
     of  a  commitment,  the Bonds will be ultimately insured  under  the
     terms  of  such an insurance policy, which are designated as  issuer
     Insured Bonds on the portfolio pages of the respective Trusts in the
     Prospectus  for  the  Fund, by the issuer  of  such  Insured  Bonds.
     Insurance  on  Insured Bonds is effective so long  as  such  Insured
     Bonds remain outstanding.  For each of these Insured Bonds, we  have
     been  advised  that the aggregate principal amount of  such  Insured
     Bonds  listed  on  the portfolio page for the respective  Trust  was
     acquired by the applicable Trust and are part of the series of  such
     Insured Bonds listed in the aggregate principal amount.  Based  upon
     the  assumption that the Insured Bonds of the Trust are part of  the
     series  covered  by  an  insurance policy  or,  in  the  case  of  a
     commitment, will be ultimately insured under the terms  of  such  an
     insurance policy, it is our opinion that any amounts received by the
     applicable  Trust  representing maturing interest  on  such  Insured
     Bonds  will be excludable from Federal gross income if, and  to  the
     same  extent as, such interest would have been so excludable if paid
     in  normal  course  by the issuer provided that, at  the  time  such
     policies  are  purchased, the amounts paid  for  such  policies  are
     reasonable, customary and consistent with the reasonable expectation
     that  the issuer of the Insured Bonds, rather than the insurer, will
     pay  debt  service  on the Insured Bonds.  Paragraph  (ii)  of  this
     opinion is accordingly applicable to such payment.
     
     Sections  1288 and 1272 of the Code provide a complex set  of  rules
governing  the  accrual of original issue discount.  These rules  provide
that  original issue discount accrues either on the basis of  a  constant
compound interest rate or ratably over the term of the Bond, depending on
the  date the Bond was issued.  In addition, special rules apply  if  the
purchase price of a Bond exceeds the original issue price plus the amount
of original issue discount which would have previously accrued based upon
its  issue price (its "adjusted issue price").  The application of  these
rules  will also vary depending on the value of the Bonds on the  date  a
Unitholder acquires his Units, and the price the Unitholder pays for  his
Units.
     
     Because  the  Trusts  do  not include any "private  activity"  bonds
within  the  meaning  of  Section 141 of the  Code  issued  on  or  after
August 8, 1986, none of the Trust Funds' interest income shall be treated
as  an item of tax preference when computing the alternative minimum tax.
In   the  case  of  corporations,  for  taxable  years  beginning   after
December  31,  1986,  the  alternative  minimum  tax  depends  upon   the
corporation's alternative minimum taxable income ("AMTI")  which  is  the
corporation's taxable income with certain adjustments.
     
     Pursuant  to Section 56(c) of the Code, one of the adjustment  items
used  in  computing AMTI of a corporation (other than an  S  Corporation,
Regulated Investment Company, Real Estate Investment Trust or REMIC)  for
taxable  years  beginning after 1989, is an amount equal to  75%  of  the
excess  of such corporation's "adjusted current earnings" over an  amount
equal  to  its AMTI (before such adjustment item and the alternative  tax
net  operating loss deduction).  "Adjusted current earnings" includes all
tax-exempt  interest, including interest on all Bonds in the  Trust,  and
tax-exempt original issue discount.
     
     Effective  for  tax  returns  filed after  December  31,  1987,  all
taxpayers  are required to disclose to the Internal Revenue  Service  the
amount of tax-exempt interest earned during the year.
     
     Section  265  of the Code provides for a reduction in  each  taxable
year  of 100 percent of the otherwise deductible interest on indebtedness
incurred  or  continued  by  financial  institutions,  to  which   either
Section  585  or  Section 593 of the Code applies, to purchase  or  carry
obligations  acquired  after August 7, 1986, the  interest  on  which  is
exempt  from  Federal income taxes for such taxable  year.   Under  rules
prescribed by Section 265, the amount of interest otherwise deductible by
such  financial institutions in any taxable year which is  deemed  to  be
attributable  to  tax-exempt obligations acquired after August  7,  1986,
will  generally be the amount that bears the same ratio to  the  interest
deduction otherwise allowable (determined without regard to Section  265)
to  the  taxpayer for the taxable year as the taxpayer's average adjusted
basis  (within  the  meaning of Section 1016) of  tax-exempt  obligations
acquired  after August 7, 1986, bears to such average adjusted basis  for
all assets of the taxpayer.
     
     We  also call attention to the fact that, under Section 265  of  the
Code, interest on indebtedness incurred or continued to purchase or carry
Units  is  not deductible for Federal income tax purposes.   Under  rules
used  by the Internal Revenue Service for determining when borrowed funds
are  considered used for the purpose of purchasing or carrying particular
assets,  the purchase of Units may be considered to have been  made  with
borrowed  funds even though the borrowed funds are not directly traceable
to the purchase of Units.  However, these rules generally do not apply to
interest  paid  on indebtedness incurred for expenditures of  a  personal
nature  such  as  a mortgage incurred to purchase or improve  a  personal
residence.
     
     "The  Revenue  Reconciliation Act of 1993" (the "Tax Act")  subjects
tax-exempt  bonds to the market discount rules of the Code effective  for
bonds purchased after April 30, 1993.  In general, market discount is the
amount  (if any) by which the stated redemption price at maturity exceeds
an  investor's purchase price (except to the extent that such difference,
if  any,  is  attributable to original issue discount  not  yet  accrued)
subject to a statutory de minimis rule.  Market discount can arise  based
on  the  price a Trust pays for Bonds or the price a Unitholder pays  for
his  or  her  Units.  Under the Tax Act, accretion of market discount  is
taxable  as  ordinary  income; under prior law, the  accretion  had  been
treated  as  capital gain.  Market discount that accretes while  a  Trust
holds  a  Bond would be recognized as ordinary income by the  Unitholders
when  principal  payments  are received on the  Bond,  upon  sale  or  at
redemption  (including early redemption), or upon the sale or  redemption
of  his  or  her  Units,  unless a Unitholder elects  to  include  market
discount in taxable income as it accrues.
     
     We have also examined the income tax laws of the State of California
to  determine  its  applicability to the  California  Insured  Municipals
Income Trust, (the "California Trust") being created as part of the  Fund
and  to  the  holders of Units in the California Trust who are  full-time
residents of the State of California ("California Unitholders").
     
     In   connection   therewith,  we  have  examined  the   Registration
Statement,  the  form  of  Prospectus  proposed  to  be  filed  with  the
Securities  and  Exchange  Commission,  the  Indenture  and  such   other
documents  as  we  have deemed pertinent.  The assets of  the  California
Trust  will consist of bonds issued by the State of California or a local
government  of California (the "California Bonds") or by the Commonwealth
of  Puerto  Rico or its authority (the "Possession Bonds") (collectively,
the "Bonds").  For purposes of the following opinions, it is assumed that
each  asset  of the California Trust is debt, the interest  on  which  is
excluded from gross income for federal income tax purposes.
     
     Neither the Sponsor nor its counsel have independently examined  the
Bonds  to  be  deposited in and held in the California  Trust.   However,
although we express no opinion with respect to the issuance of the Bonds,
in rendering our opinion expressed herein, we have assumed that:  (i) the
Bonds  were validly issued; (ii) the interest thereon is excludable  from
gross income for federal income tax purposes;  and (iii) interest on  the
Bonds,  if received directly by a California Unitholder, would be  exempt
from the income tax imposed by the State of California that is applicable
to  individuals,  trusts  and  estates (the "California  Personal  Income
Tax").  This opinion does not address the taxation of persons other  than
full  time  residents  of  California.  We  have  assumed  that,  at  the
respective  times of issuance of the Bonds, opinions that the Bonds  were
validly  issued  and  that interest on the Bonds is excluded  from  gross
income  for Federal income tax purposes were rendered by bond counsel  to
the  respective issuing authorities.  In addition, we have assumed  that,
with  respect  to  the  California Bonds, bond  counsel  to  the  issuing
authorities  rendered opinions that the interest on the California  Bonds
is  exempt  from the California Personal Income Tax and, with respect  to
the  Possession  Bonds, bond counsel to the issuing authorities  rendered
opinions  that  the Possession Bonds and the interest thereon  is  exempt
from  all state and local income taxation.  Neither the Sponsor  nor  its
counsel  has  made any review for the California Trust of the proceedings
relating  to  the issuance of the Bonds or of the basis for the  opinions
rendered in connection therewith.
     
     Based  upon the foregoing, and upon an investigation of such matters
of  law  as  we considered to be applicable, we are of the opinion  that,
under existing provisions of the law of the State of California as of the
date hereof:
     
           1.    The California Trust is not an association taxable as  a
     corporation for purposes of the California Bank and Corporation  Tax
     Law, and each California Unitholder will be treated as the owner  of
     a  pro rata portion of the California Trust, and the income of  such
     portion of the California Trust will be treated as the income of the
     California Unitholders under the California Personal Income Tax.
     
           2.    Interest on the Bonds which is exempt from tax under the
     California Personal Income Tax when received by the California Trust
     and  which  would be excludable from California taxable  income  for
     purposes  of the California Personal Income Tax if received directly
     by  a  California  Unitholder, will be  excludable  from  California
     taxable  income for purposes of the California Personal  Income  Tax
     when  received  by  the  California  Trust  and  distributed  to   a
     California Unitholder.
     
           3.    Each California Unitholder of the California Trust  will
     generally recognize gain or loss for California Personal Income  Tax
     purposes  if  the Trustee disposes of a Bond (whether by redemption,
     sale  or  otherwise)  or when the California Unitholder  redeems  or
     sells  Units  of  the California Trust, to the extent  that  such  a
     transaction results in a recognized gain or loss to such  California
     Unitholder  for  federal income tax purposes.   However,  there  are
     certain  differences between the recognition of  gain  or  loss  for
     federal  income tax purposes and for California Personal Income  Tax
     purposes,  and  California Unitholders are advised to consult  their
     own  tax  advisors.   Tax basis reduction requirements  relating  to
     amortization  of bond premium may, under some circumstances,  result
     in  a  California Unitholder realizing taxable gain  for  California
     Personal Income Tax purposes when a Unit is sold or redeemed for  an
     amount equal to or less than its original cost.
     
           4.    Under  the California Personal Income Tax,  interest  on
     indebtedness  incurred  or continued by a California  Unitholder  to
     purchase  Units  in  the  California Trust  is  not  deductible  for
     purposes of the California Personal Income Tax.
     
     This  opinion relates only to California Unitholders subject to  the
California Personal Income Tax.  No opinion is expressed with respect  to
the taxation of California Unitholders subject to the California Bank and
Corporation  Tax  Law  and  such California Unitholders  are  advised  to
consult  their own tax advisors.  Please note, however, that interest  on
the  underlying  Bonds  attributed to a  California  Unitholder  that  is
subject  to the California Bank and Corporation Tax Law may be includible
in  its gross income for purposes of determining its California franchise
tax.   We have not examined any of the Bonds to be deposited and held  in
the  California Trust or the proceedings for the issuance thereof or  the
opinions of bond counsel with respect thereto, and we express no  opinion
with  respect  to taxation under any other provisions of  the  California
law.   Ownership  of  the Units may result in collateral  California  tax
consequences to certain taxpayers.  Prospective investors should  consult
their  tax  advisors  as  to the applicability  of  any  such  collateral
consequences.

                                      Very truly yours,

                                      Chapman and Cutler

                                                                     Exhibit 3.3
                               Winston & Strawn
                                200 Park Avenue
                        New York, New York  10166-4193
                                       
                                 July 29, 1998

Insured Municipals Income Trust, 233rd Insured Multi-Series
c/o The Bank of New York, As Trustee
101 Barclay Street, 17 West
New York, New York 10286

Dear Sirs:
     
     We have acted as special counsel for the Insured Municipals Income Trust,
233rd  Insured  Multi-Series  (the "Fund") consisting  of  California  Insured
Municipals Income Trust, Series 174, Michigan Insured Municipals Income Trust,
Series 151 and New Jersey Insured Municipals Income Trust, Series 123 (in  the
aggregate  "Trusts" and individually "Trust") for the purpose  of  determining
the   applicability  of  certain  New  York  taxes  under  the   circumstances
hereinafter described.
     
     The  Fund  is  created pursuant to a Trust Agreement  (the  "Indenture"),
dated  as  of today (the "Date of Deposit") among Van Kampen Funds  Inc.  (the
"Depositor"), American Portfolio Evaluation Services, a division of Van Kampen
Investment  Advisory Corp., as Evaluator, and The Bank of New York as  Trustee
(the  "Trustee").  As described in the prospectus relating to the  Fund  dated
today to be filed as an amendment to a registration statement previously filed
with the Securities and Exchange Commission (File Number 333-45259) under  the
Securities  Act  of  1933, as amended (the "Prospectus" and the  "Registration
Statement"),  the objectives of the Fund are the generation of  income  exempt
from  Federal taxation and as regards each of the Trusts exempt, as  indicated
in  the Prospectus,  from income tax, if any, of the State denominated in  the
name of that Trust.  No opinion is expressed herein with regard to the Federal
or State (other than New York) tax aspects of the bonds, the Fund, the Trusts,
units of each Trust (the "Units"), or any interest, gains or losses in respect
thereof.
     
     As  more  fully  set  forth in the Indenture and in the  Prospectus,  the
activities of the Trustee will include the following:
     
     On  the Date of Deposit, the Depositor will deposit with the Trustee with
respect  to  each  Trust,  the  total principal  amount  of  interest  bearing
obligations  and/or  contracts  for  the purchase  thereof  together  with  an
irrevocable letter of credit in the amount required for the purchase price and
accrued  interest,  if any, along with an insurance policy  purchased  by  the
Depositor  evidencing  the  insurance  guaranteeing  the  timely  payment   of
principal and interest of some of the obligations comprising the corpus of the
Trusts  other  than  those  obligations the timely payment  of  principal  and
interest  of  which  are guaranteed by an insurance policy  purchased  by  the
issuer thereof or a prior owner, which may include the Depositor prior to  the
Date  of  Deposit,  all  as more fully set forth in  the  Prospectus  and  the
Registration Statement with respect to each Trust.
     
     We  understand  that  with respect to the obligations  described  in  the
preceding  paragraph  all  insurance  policies,  whether  purchased   by   the
Depositor,  the  issuer or a prior owner, provide, or will provide,  that  the
amount paid by the insurer in respect of any bond may not exceed the amount of
principal  and  interest due on the bond and such payment  will  in  no  event
relieve  the  issuer  from its continuing obligation  to  pay  such  defaulted
principal and interest in accordance with the terms of the obligation.
     
     The  Trustee will not participate in the selection of the obligations  to
be  deposited in the Fund, and, upon the receipt thereof, will deliver to  the
Depositor  a  registered certificate for the number of Units representing  the
entire corpus of each Trust as more fully set forth in the Prospectus and  the
Registration Statement.  The Units, which are represented by certificates (the
"Certificates"),  will  be offered to the public by the  Prospectus  upon  the
effectiveness of the Registration Statement.
     
     The  duties of the Trustee, which are ministerial in nature, will consist
primarily of crediting the appropriate accounts with interest received by each
Trust  and with the proceeds from the disposition of obligations held in  each
Trust  and the distribution of such interest and proceeds to the Unit  holders
of  that  Trust.   The Trustee will also maintain records  of  the  registered
holders  of Certificates representing an interest in each Trust and administer
the  redemption  of Units by such Certificate holders and may perform  certain
administrative functions with respect to an automatic investment option.
     
     Generally, obligations held in the Fund may be removed therefrom  by  the
Trustee  only upon redemption prior to their stated maturity, at the direction
of  the  Depositor in the event of an advance refunding or upon the occurrence
of  certain other specified events which adversely affect the sound investment
character of the Fund, such as default by the issuer in payment of interest or
principal  on  the  obligation and no provision for payment is  made  therefor
either  pursuant  to the portfolio insurance or otherwise  and  the  Depositor
fails to instruct the Trustee, within thirty (30) days after notification,  to
hold such obligation.
     
     Prior  to the termination of the Fund, the Trustee is empowered  to  sell
Bonds,  from  a list furnished by the Depositor, and only for the purposes  of
redeeming Units tendered to it and of paying expenses for which funds are  not
available.  The Trustee does not have the power to vary the investment of  any
Unit  holder in the Fund, and under no circumstances may the proceeds of  sale
of  any obligations held by the Fund be used to purchase new obligations to be
held therein.
     
     Article  9-A of the New York Tax Law imposes a franchise tax on  business
corporations,  and, for purposes of that Article, Section 208(1)  defines  the
term "corporation" to include, among other things, "any business conducted  by
a   trustee  or  trustees  wherein  interest  or  ownership  is  evidenced  by
certificate or other written instrument."
     
     The Regulations promulgated under Section 208 provide as follows:
          
          The  term  "trust" includes any business  conducted  by  a
          trustee  or  trustees in which interest  or  ownership  is
          evidenced  by  certificate  or other  written  instrument.
          Such  a  trust  includes,  but  is  not  limited  to,   an
          association commonly referred to as a "business trust"  or
          "Massachusetts trust".  In determining whether  a  trustee
          or  trustees  are conducting a business, the form  of  the
          agreement is of significance but is not controlling.   The
          actual  activities of the trustee or trustees,  not  their
          purposes and powers, will be regarded as decisive  factors
          in  determining whether a trust is subject  to  tax  under
          Article  9-A.   The  mere  investment  of  funds  and  the
          collection    of   income   therefrom,   with   incidental
          replacement of securities and reinvestment of funds,  does
          not constitute the conduct of a business in the case of  a
          trust.  20 NYCRR 1-2.5(b)(2) (July 11, 1990).
     
     New  York  cases  dealing with the question of whether a  trust  will  be
subject to the franchise tax have also delineated the general rule that  where
a  trustee  merely  invests  funds and collects  and  distributes  the  income
therefrom,  the  trust is not engaged in business and is not  subject  to  the
franchise  tax.   Burrell v. Lynch, 274 A.D. 347, 84 N.Y.S.2d 171  (3rd  Dept.
1948), order resettled, 274 A.D. 1073, 85 N.Y.S.2d 705 (3rd Dept. 1949).
     
     In  an opinion of the Attorney General of the State of New York, 47  N.Y.
Att'y. Gen. Rep. 213 (Nov. 24, 1942), it was held that where the trustee of an
unincorporated  investment  trust was without authority  to  reinvest  amounts
received  upon the sales of securities and could dispose of securities  making
up  the  trust  only  upon the happening of certain specified  events  or  the
existence  of certain specified conditions, the trust was not subject  to  the
franchise tax.
     
     In  the instant situation, the Trustee is not empowered to, and we assume
will  not,  sell obligations contained in the corpus of the Fund and  reinvest
the  proceeds  therefrom.   Further, the power to  sell  such  obligations  is
limited  to  circumstances in which the creditworthiness or soundness  of  the
obligation  is  in question or in which cash is needed to pay  redeeming  Unit
holders  or to pay expenses, or where the Fund is liquidated pursuant  to  the
termination of the Indenture.  Only in circumstances in which the issuer of an
obligation attempts to refinance it can the Trustee exchange an obligation for
a  new security.  In substance, the Trustee will merely collect and distribute
income  and will not reinvest any income or proceeds, and the Trustee  has  no
power to vary the investment of any Unit holder in the Fund.
     
     Under  Subpart  E  of Part I, Subchapter J of Chapter 1 of  the  Internal
Revenue Code of 1986, as amended (the "Code"), the grantor of a trust will  be
deemed to be the owner of the trust under certain circumstances, and therefore
taxable  on  his  proportionate interest in the income  thereof.   Where  this
Federal  tax rule applies, the income attributed to the grantor will  also  be
income to him for New York income tax purposes.  (See TSB-M-78(9)(C), New York
Department of Taxation and Finance, June 23, 1978.)
     
     By  letter,  dated  today, Messrs. Chapman and Cutler,  counsel  for  the
Depositor,  rendered their opinion that each Unit holder of a  Trust  will  be
considered  as  owning a share of each asset of that Trust in  the  proportion
that  the  number  of Units held by such holder bears to the total  number  of
Units  outstanding and the income of a Trust will be treated as the income  of
each  Unit  holder of that Trust in said proportion pursuant to Subpart  E  of
Part I, Subchapter J of Chapter 1 of the Code.
     
     Based  on the foregoing and on the opinion of Messrs. Chapman and Cutler,
counsel  for the Depositor, dated today, upon which we specifically  rely,  we
are  of  the  opinion that under existing laws, rulings, and  court  decisions
interpreting the laws of the State and City of New York:
     
           1.    Each  Trust will not constitute an association taxable  as  a
     corporation under New York law, and, accordingly, will not be subject  to
     tax  on its income under the New York State franchise tax or the New York
     City general corporation tax.
     
           2.    The income of each Trust will be treated as the income of the
     Unit holders under the income tax laws of the State and City of New York.
     
          3.   Unit holders who are not residents of the State of New York are
     not subject to the income tax law thereof with respect to any interest or
     gain derived from the Fund or any gain from the sale or other disposition
     of  the  Units, except to the extent that such interest or gain  is  from
     property employed in a business, trade, profession or occupation  carried
     on in the State of New York.
     
     In  addition, we are of the opinion no New York State stock transfer  tax
will  be  payable in respect of any transfer of the Certificates by reason  of
the  exemption contained in paragraph (a) of Subdivision 8 of Section  270  of
the New York Tax Law.
     
     We  hereby  consent to the filing of this opinion as an  exhibit  to  the
Registration  Statement relating to the Units and to the use of our  name  and
the reference to us in the Registration Statement and in the Prospectus.
                                    
                                    Very truly yours,
                                    
                                    Winston & Strawn

                                                                     Exhibit 3.4
                   Miller, Canfield, Paddock and Stone

                              July 29, 1998

               Miller, Canfield, Paddock and Stone, p.l.c.
                  1400 North Woodward Avenue, Suite 100
                    Bloomfield Hills, Michigan  48304

                              July 29, 1998

Insured Municipals Income Trust, 233rd Insured Multi-Series
In care of
Van Kampen Funds Inc.
One Parkview Plaza
Oakbrook Terrace, Illinois  60181

The Bank of New York through
its Wall Street Trust division
  as Trustee of Insured Municipals Income
  Trust, 233rd Insured Multi-Series
101 Barclay Street
New York, New York  10286
     
     Re: Insured Municipals Income Trust, 233rd Insured Multi-Series
         (Michigan Insured Municipals Income Trust, Series 151)

Gentlemen:
     
     We  have  acted as special Michigan counsel to you as  sponsors  and
trustees  of  Insured Municipals Income Trust, 233rd Insured Multi-Series
(Michigan Insured Municipals Income Trust, Series 151) referred to  above
(the "Fund").  You have asked that we, acting in such capacity, render an
opinion  to you with respect to certain matters relating to the  issuance
of  the  units of fractional undivided interest in the Fund (the "Units")
pursuant  to  a  Registration  Statement  on  Form  S-6  filed  with  the
Securities   and  Exchange  Commission  (the  "Commission")   under   the
Securities Act of 1933, as amended (the "Registration Statement").
     
     You  have  requested  our  opinion as to the  applicability  to  the
Michigan Insured Municipals Income Trust (the "Michigan Trust")  and  the
holders  of  Units  (the "Holders"), each of which Units  represents  the
ownership  of a specified fractional undivided interest in the assets  of
the  Michigan  Trust, of the Michigan Income Tax Act  (M.C.L.A.  Sections
206.1 et seq.; M.S.A. Sections 7.557 (101) et seq.) (the "Michigan Income
Tax"), the City Income Tax Act (M.C.L.A. Sections 141.501 et seq.; M.S.A.
Sections 5.3194 (1) et seq.), which incorporates the "Uniform City Income
Tax  Ordinance," the First Class School District excise tax  upon  income
(M.C.L.A.  Section 380.451; M.S.A. S15.4451) (collectively,  the  "income
tax laws"), the Michigan Single Business Tax Act (M.C.L.A. Sections 208.1
et  seq.; M.S.A. Sections 7.558 (1) et seq.) (the "Single Business  Tax")
and  the  Michigan  Tax  on  Ownership of  Intangible  Personal  Property
(M.C.L.A.  Sections 205.131 et seq.; M.S.A. Sections 7.556 (1)  et  seq.)
(the  "Intangibles  Tax"). The total repeal of the  Intangibles  Tax  was
effective January 1, 1998 (1995 PA 4 and 5).  You have also requested our
opinion  regarding the tax status of proceeds payable from  an  insurance
policy  to  be obtained by either the Fund or by the issuer of the  Bonds
involved,  guaranteeing prompt payment of principal and interest  on  all
Bonds in the portfolio of the Fund.
     
     The Michigan Trust, its formation, its proposed method of operation,
the  rights of owners of Certificates representing Units, the  nature  of
such ownership and the portfolio of investments of the Michigan Trust are
described and set forth in the Prospectus dated July 29, 1998, filed with
the Securities and Exchange commission in Registration No. 333-45259.  In
giving  our  opinion set forth hereunder, we have relied upon  the  facts
contained in such Registration Statement, including the fact that, at the
respective dates of issuance of the underlying Debt Obligations, opinions
of  bond counsel to the respective Michigan authorities issuing such Debt
Obligations  were  given  with  respect  to  the  validity  of  the  Debt
Obligations  and the exemption of the same, and of the interest  thereon,
from Michigan taxation.
     
     Based on the above, it is our opinion that:
     
     The Michigan Trust and the owners of Units will, in our opinion,  be
treated  for  purposes of the Michigan income tax  laws  and  the  Single
Business Tax in substantially the same manner as they are for purposes of
the  Federal income tax laws, as currently enacted.  Accordingly, we have
relied  upon  the  opinion  of  Messrs. Chapman  and  Cutler  as  to  the
applicability  of Federal income tax under the Internal Revenue  Code  of
1986,  as  currently amended, to the Michigan Trust and  the  Holders  of
Units.
     
     Under  the  income tax laws of the State of Michigan,  the  Michigan
Trust  is not an association taxable as a corporation; the income of  the
Michigan  Trust will be treated as the income of the Holders of Units  of
the  Michigan  Trust  and be deemed to have been received  by  them  when
received by the Michigan Trust.  Interest on the Debt Obligations in  the
Michigan  Trust  which is exempt from tax under the Michigan  income  tax
laws  when received by the Michigan Trust will retain its status  as  tax
exempt interest to the Holders of Units of the Michigan Trust.
     
     For  purposes of the Michigan income tax laws, each Holder of  Units
of  the  Michigan Trust will be considered to have received his pro  rata
share  of interest on each Debt Obligation in the Michigan Trust when  it
is  received by the Michigan Trust, and each Holder will have  a  taxable
event  when the Michigan Trust disposes of a Debt Obligation (whether  by
sale,  exchange,  redemption or payment at maturity)  or  when  the  Unit
Holder  redeems  or  sells  his  Unit,  to  the  extent  the  transaction
constitutes  a  taxable event for Federal income tax purposes.   The  tax
cost of each Unit to a Unit Holder will be established and allocated  for
purposes of the Michigan income tax laws in the same manner as such  cost
is established and allocated for Federal income tax purposes.
     
     The  Michigan Single Business Tax replaced the tax on corporate  and
financial  institution  income under the Michigan  Income  Tax,  and  the
intangible  tax with respect to those intangibles of persons  subject  to
the  Single  Business Tax the income from which would  be  considered  in
computing  the  Single Business Tax.  Persons are subject to  the  Single
Business Tax only if they are  engaged in "business activity," as defined
in the Act.  Under the Single Business Tax, both interest received by the
Michigan  Trust  on  the  underlying  Debt  Obligations  and  any  amount
distributed from the Michigan Trust to a Unit Holder, if not included  in
determining taxable income for Federal income tax purposes, is  also  not
included in the adjusted tax base upon which the Single Business  Tax  is
computed,  of  either  the Michigan Trust or the Unit  Holders.   If  the
Michigan  Trust  or  the Unit Holders have a taxable  event  for  Federal
income tax purposes when the Michigan Trust disposes of a Debt Obligation
(whether  by  sale, exchange, redemption or payment at maturity)  or  the
Holder  redeems or sells his Unit, an amount equal to any  gain  realized
from  such taxable event which was included in the computation of taxable
income  for  Federal  income tax purposes (plus an amount  equal  to  any
capital gain of an individual realized in connection with such event  but
excluded in computing that individual's Federal taxable income)  will  be
included  in  the tax base against which, after allocation, apportionment
and other adjustments, the Single Business Tax is computed.  The tax base
will be reduced by an amount equal to any capital loss realized from such
a  taxable  event,  whether  or  not the capital  loss  was  deducted  in
computing Federal taxable income in the year the loss occurred.   Holders
should consult their tax advisor as to their status under Michigan law.
     
     Any proceeds paid under an insurance policy issued to the Trustee of
the Fund, or paid under individual policies obtained by issuers of Bonds,
which, when received by the Unit Holders, represent maturing interest  on
defaulted  obligations held by the Trustee, will be excludable  from  the
Michigan income tax laws and the Single Business Tax if, and to the  same
extent  as,  such interest would have been so excludable if paid  by  the
issuer  of the defaulted obligations.  While treatment under the Michigan
Intangibles  Tax  is  not  premised upon  the  characterization  of  such
proceeds  under  the  Internal Revenue Code, the Michigan  Department  of
Treasury should adopt the same approach as under the Michigan income  tax
laws and the Single Business tax.
     
     Chapman  and  Cutler  of 111 West Monroe Street,  Chicago,  Illinois
60603,  are entitled to rely on this opinion as though it were  addressed
to them.
     
     We  also  advise you that, as the Tax Reform Act of 1986  eliminated
the  capital  gain deduction for tax years beginning after  December  31,
1986,  the  federal adjusted gross income, the computation base  for  the
Michigan  Income Tax, of a Unit Holder will be increased  accordingly  to
the  extent  such  capital  gains are realized when  the  Michigan  Trust
disposes of a Debt Obligation or when the Unit Holder redeems or sells  a
Unit,  to  the  extent such transaction constitutes a taxable  event  for
Federal income tax purposes.
     
     We  hereby consent to the reference to Miller, Canfield, Paddock and
Stone  under the heading "Michigan Tax Status" in the Prospectus relating
to  the  Michigan  Trust which is part of the Registration  Statement  in
Registration  No.  333-45259  filed  with  the  Securities  and  Exchange
Commission  under  the Securities Act of 1933, as  amended,  and  to  the
filing of this opinion as an exhibit to said registration statement.

                               Yours very truly,
                               
                               Miller, Canfield, Paddock And Stone, p.l.c.


                                                                     Exhibit 3.5

                      Pitney, Hardin, Kipp & Szuch
                              P.O. Box 1945
                    Morristown, New Jersey 07962-1945

                              July 29, 1998

Van Kampen Funds Inc.
One Parkview Plaza
Oakbrook Terrace, Illinois 60181

     Re: Insured Municipals Income Trust, 233rd Insured Multi-Series
         (New Jersey Insured Municipals Income Trust, Series 123)

Gentlemen:
     
     We  have acted as special counsel, with respect to New Jersey  state
tax  matters,  to Insured Municipals Income Trust, 233rd  Insured  Multi-
Series  (the "Fund") concerning a Registration Statement (No.  333-45259)
on  Form  S-6 under the Securities Act of 1933, as amended, covering  the
issuance  by  the  Fund  of units of fractional undivided  interest  (the
"Units")  in several state trusts (the "State Trusts"), one of  which  is
New Jersey Insured Municipals Income Trust, Series 123 included as a part
of  the  Fund (the "New Jersey Trust").  Such Units will be purchased  by
various investors ("Certificateholders").
     
     The  Fund  is  organized under a Trust Indenture and Agreement  (the
"Indenture")  of even date herewith (the "Date of Deposit")  between  Van
Kampen Funds Inc. (the "Depositor") and The Bank of New York through  its
Wall  Street Trust division (the "Trustee").  Each Unit of the New Jersey
Trust represents a fractional undivided interest in the principal and net
income  of  the New Jersey Trust.  The New Jersey Trust will be comprised
of  that number of units which will establish as close as possible as  of
the  Date  of  Deposit  a  Public  Offering  Price  (as  defined  in  the
Prospectus)  per  Unit  of  $1,000.   The  New  Jersey  Trust   will   be
administered   as   a   distinct  entity  with   separate   certificates,
investments, expenses, books and records.
     
     In  acting  as special counsel, we have examined such documents  and
records with respect to a prior series, Insured Municipals Income  Trust,
229th  Insured  Multi-Series, as we deem necessary,  including,  but  not
limited to, the Trust Indenture and Agreement (the "229th Insured  Multi-
Series  Indenture")  and  the Prospectus.   You  have  advised  that  the
Indenture  is  identical in all material respects to  the  229th  Insured
Multi-Series  Indenture.   You  have also advised  that  the  opinion  of
Messrs. Chapman and Cutler with respect to the Federal income tax  status
of  the Fund, its constituent State Trusts and its Certificateholders, is
in  all  material  respects identical to the opinion  issued  by  Messrs.
Chapman and Cutler for the Insured Municipals Income Trust, 229th Insured
Multi-Series.
     
     We  note  that  the assets of the New Jersey Trust will  consist  of
interest-bearing obligations issued by or on behalf of the State  of  New
Jersey,  and  counties, municipalities, authorities and  other  political
subdivisions thereof, and certain territories of the United  States  (the
"Bonds"). Distributions of the interest received by the New Jersey  Trust
will   be  made  to  each  Certificateholder  semi-annually  unless   the
Certificateholder  elects  to receive such  distributions  on  a  monthly
basis.   In  the opinion of bond counsel to each issuer, the interest  on
all Bonds in the New Jersey Trust is exempt from Federal income tax under
existing law.
     
     We  understand  that  on  the  Date of  Deposit  the  Depositor  has
deposited with the Trustee the total principal amount of interest-bearing
obligations  and/or contracts for the purchase thereof together  with  an
irrevocable  letter  of credit in the amount required  for  the  purchase
price and accrued interest, if any, and an insurance policy purchased  by
the Depositor evidencing the insurance guaranteeing the timely payment of
principal  and interest of some of the obligations comprising the  corpus
of  the Fund, as more fully set forth in the Preliminary Prospectus.  All
other obligations included in the deposit described above will be covered
by  insurance  obtained  by  the issuer of such obligations  guaranteeing
timely  payment of principal and interest.   Such insurance will  provide
that the amount paid by the insurer in respect of any Bond may not exceed
the  amount  of principal and interest due on the Bond and  such  payment
will in no event relieve the issuer from its continuing obligation to pay
such defaulted principal and interest in accordance with the terms of the
obligation.
     
     Section  2.04 of the Indenture provides that each State Trust  is  a
separate  and  distinct trust for all purposes, the assets of  one  State
Trust may not be commingled with the assets of any other State Trust, and
the  expenses of one State Trust shall not be charged against  any  other
State  Trust.   Section  2.04  further  provides  that  the  certificates
representing  the ownership of an undivided fractional  interest  in  one
State  Trust shall not be exchangeable for certificates representing  the
ownership of an undivided fractional interest in any other State Trust.
     
     The Indenture provides further, among other things, that the Trustee
shall:
     
          (a)   collect all interest and monies payable to the New Jersey
     Trust,  and  hold  the funds collected in trust  on  behalf  of  the
     Certificateholders of the New Jersey Trust;
     
          (b)    set aside from such funds any amounts necessary for  the
     reimbursement of advances and for the payment of expenses, taxes and
     governmental charges in respect of the New Jersey Trust;
     
         (c)   distribute all remaining amounts semi-annually, or monthly
     if  so elected by a Certificateholder, to the Certificateholders  in
     proportion to their interest in the New Jersey Trust;
     
          (d)    redeem  any  certificates tendered for redemption  by  a
     Certificateholder  provided  that  the  Trustee  has  notified   the
     Depositor  of  the tender and the Depositor has failed  to  indicate
     within  a time specified in the Indenture that it will purchase  the
     tendered certificates from the tendering Certificateholder;
     
          (e)    sell or liquidate any or all Bonds at the sole direction
     of  the  Depositor and at such price and time and in such manner  as
     shall  be  determined by the Depositor, provided that the  Depositor
     has  determined that any one or more of certain conditions specified
     in the Indenture exists;
     
          (f)   in connection with an offer made by an obligor of any  of
     the Bonds to issue new obligations, in exchange and substitution for
     any  issue  of  Bonds  pursuant  to a  plan  for  the  refunding  or
     refinancing of such Bonds, pursuant to the sole instruction  of  the
     Depositor in writing, reject such offer and either hold or sell such
     Bonds,  or  accept or reject such offer or to take any other  action
     with respect thereto as the Depositor may deem proper; and
     
          (g)    at  the  direction of the Depositor, acquire Replacement
     Bonds,  as defined in the Prospectus, to make up the original corpus
     of  the  New  Jersey Trust in the event of a failure to deliver  any
     Bond  that  has  been  purchased for the New Jersey  Trust  under  a
     contract,  including those Bonds purchased on a  "when,  as  and  if
     issued" basis.
     
     The  Trustee  has  no  power of sale except  (a)  on  order  of  the
Depositor   as  stated  herein,  (b)  to  provide  funds,  not  otherwise
available, to pay taxes, charges, expenses, fees or indemnities,  (c)  in
case  of default on any of the Bonds, but only after notification of  the
Depositor,  and provided that the Depositor has not, within  30  days  of
such notification, given any instructions to sell or to hold, or has  not
taken  any  other action in connection with, such Bonds, or (d)  for  the
purpose of redeeming certificates tendered by any Certificateholder.  The
Trustee has no power to reinvest, except as stated in Section 3.08 of the
Indenture.  Such limited power of reinvestment is in furtherance  of  the
Trustee's obligation to protect the trust assets, and does not constitute
power to vary investments.
     
     The  Indenture  provides  further,  among  other  things,  that  the
Certificateholders:
     
          (a)    may  tender  their certificate or  certificates  to  the
     Trustee for redemption except in limited circumstances;
     
         (b)   will not have any right to vote or in any manner otherwise
     control  the  operation and management of the Fund, the  New  Jersey
     Trust, or the obligations of the Depositor or Trustee;
     
          (c)    may  elect to receive distributions from the New  Jersey
     Trust on a monthly basis;
     
          (d)   may terminate the New Jersey Trust at any time by written
     consent   of  Certificateholders  representing  51%  of   the   then
     outstanding Units of the New Jersey Trust; and
     
         (e)   shall be under no liability to any third persons by reason
     of  any  action  taken  by the Depositor or  Trustee  or  any  other
     Certificateholder, or any other cause whatsoever.
     
     You have advised that, in the opinion of Messrs. Chapman and Cutler,
for Federal income tax purposes the Fund and New Jersey Trust will not be
taxable  as  a  corporation or association but will be  governed  by  the
provisions  of  Subchapter J (relating to trusts) of  Chapter  1  of  the
Internal  Revenue Code of 1986, as amended.  Each Certificateholder  will
be considered the owner of a pro rata portion of the New Jersey Trust and
will  be  subject to tax on the income therefrom under the provisions  of
Subpart  E of Subchapter J of Chapter 1 of the Internal Revenue  Code  of
1986,  as  amended.  The New Jersey Trust itself will not be  subject  to
Federal  income  taxes.  For Federal income tax purposes,  each  item  of
trust  income  will  have  the  same  character  in  the  hands  of   the
Certificateholder  as  it  would  have  in  the  hands  of  the  Trustee.
Accordingly,  to  the  extent that the income of  the  New  Jersey  Trust
consists  of interest excludable from gross income under Section  103  of
the  Internal  Revenue  Code of 1986, as amended,  such  income  will  be
excludable   from   Federal  gross  income  of   the   Certificateholder.
Furthermore, any proceeds paid under the insurance policy issued  to  the
Trustee  of  the  Fund  which represent maturing  interest  on  defaulted
obligations  held  by the Trustee will be excludable from  Federal  gross
income  if, and to the same extent as, such interest would have  been  so
excludable  if  paid by the issuer of the defaulted obligations  and  the
excludability from Federal gross income of interest on Bonds which may be
insured  by policies issued directly to the respective Bond issuers  will
not  be  affected if the source of any interest payment  is  from  policy
proceeds.
     
     Based   on   our  examination  of  the  229th  Insured  Multi-Series
Indenture,  your advice that the Indenture is identical in  all  material
respects  to  the 229th Insured Multi-Series Indenture, your advice  that
the  opinion  of Messrs.  Chapman and Cutler with respect to the  Federal
income  tax  status  of the Fund, its constituent State  Trusts  and  its
Certificateholders  dated  as of the date  hereof  is  identical  in  all
material  respects  to  its counterpart in the  prior  issue  of  Insured
Municipals Income Trust, 229th Insured Multi-Series, and, with respect to
Federal  income tax matters, with your approval, relying solely upon  the
opinion of Messrs. Chapman and Cutler, and our examination of such  other
documents, records and matters of law as we deem necessary, we are of the
opinion that for New Jersey state and local tax purposes:
     
          1.   The New Jersey Trust will be recognized as a trust and not
     an  association taxable as a corporation.  The New Jersey Trust will
     not be subject to the New Jersey Corporation Business Tax or the New
     Jersey Corporation Income Tax.
     
           2.    With respect to the non-corporate Certificateholders who
     are  residents  of  New Jersey, the income of the New  Jersey  Trust
     which is allocable to each such Certificateholder will be treated as
     the  income  of  such Certificateholder under the New  Jersey  Gross
     Income  Tax.  Interest on the underlying Bonds which would be exempt
     from  New  Jersey  Gross  Income Tax if directly  received  by  such
     Certificateholder will retain its status as tax-exempt interest when
     received   by  the  New  Jersey  Trust  and  distributed   to   such
     Certificateholder.   Any proceeds paid under  the  insurance  policy
     issued to the Trustee of the Fund with respect to the Bonds or under
     individual  policies  obtained by issuers of Bonds  which  represent
     maturing interest on defaulted obligations held by the Trustee  will
     be  exempt  from  New Jersey Gross Income Tax if, and  to  the  same
     extent  as, such interest would have been so exempt if paid  by  the
     issuer of the defaulted obligations.
     
           3.   A non-corporate Certificateholder will not be subject  to
     the New Jersey Gross Income Tax on any gain realized either when the
     New  Jersey  Trust  disposes of a Bond (whether by  sale,  exchange,
     redemption,  or  payment at maturity) or when the  Certificateholder
     redeems  or  sells his Units, or upon payment of any proceeds  under
     the  insurance policy issued to the Trustee of the Fund with respect
     to  the  Bonds or under individual policies obtained by  issuers  of
     Bonds  which  represent maturing principal on defaulted  obligations
     held by the Trustee.  Any loss realized on such disposition may  not
     be  utilized  to offset gains realized by such Certificateholder  on
     the  disposition of assets the gain on which is subject to  the  New
     Jersey Gross Income Tax.
     
           4.   Units of the New Jersey Trust may be taxable on the death
     of a Certificateholder under the New Jersey Transfer Inheritance Tax
     law or the New Jersey Estate Tax Law.
     
          5.   If a Certificateholder is a corporation subject to the New
     Jersey  Corporation  Business Tax or New Jersey  Corporation  Income
     Tax,  interest  from  the Bonds in the New  Jersey  Trust  which  is
     allocable  to such corporation will be includable in its entire  net
     income  for purposes of the New Jersey Corporation Business  Tax  or
     New  Jersey  Corporation  Income  Tax,  less  any  interest  expense
     incurred  to  carry  such  investment to the  extent  such  interest
     expense  has not been deducted in computing Federal taxable  income.
     Net  gains  derived  by such corporation on the disposition  of  the
     Bonds  by  the New Jersey Trust or on the disposition of  its  Units
     will  be  included in its entire net income for purposes of the  New
     Jersey  Corporation  Business Tax or New Jersey  Corporation  Income
     Tax.   Any  proceeds paid under the insurance policy issued  to  the
     Trustee  of  the Fund with respect to the Bonds or under  individual
     policies  obtained  by  issuers of Bonds  which  represent  maturing
     interest or maturing principal on defaulted obligations held by  the
     Trustee  will be included in its entire net income for  purposes  of
     the  New  Jersey Corporation Business Tax or New Jersey  Corporation
     Income  Tax if, and to the same extent as, such interest or proceeds
     would  have been so included if paid by the issuer of the  defaulted
     obligations.
     
     We  have not examined any of the obligations to be deposited in  the
Fund,  and  express  no opinion as to whether the interest  on  any  such
obligations  would  in  fact  be tax-exempt if  directly  received  by  a
Certificateholder;  nor  have  we made  any  review  of  the  proceedings
relating to the issuance of Bonds or the basis for bond counsel opinions.
     
     We hereby consent to the filing of this opinion as an exhibit to the
Registration Statement and to the reference to our firm and a summary  of
this  opinion  included in such Registration Statement  and  the  related
Prospectus.  In giving such consent we do not thereby admit that  we  are
in  the category of persons whose consent is required by Section 7 of the
Securities  Act  of  1933,  as amended, and  the  rules  and  regulations
thereunder.
     
     Except  as  indicated in the immediately preceding paragraph  hereof
and except with our prior written consent, this opinion may not be quoted
in  whole  or  in  part  or otherwise referred  to  in  any  document  or
instrument or be furnished to or relied upon by any person other than the
addressee  and  The  Bank  of  New York through  its  Wall  Street  Trust
division, as Trustee (including any successor trustee).

                                    Very truly yours,
                                    
                                    Pitney, Hardin, Kipp & Szuch


                                                              Exhibit 4.1

Interactive Data
14 Wall Street
New York, NY  10005

July 29, 1998

Van Kampen Funds Inc.
One Parkview Plaza
Oakbrook Terrace, IL 60181
     
     Re: Insured Municipals Income Trust, 233rd Insured Multi-Series
         (A Unit Investment Trust) Registered Under the Securities Act of 1933
         File No. 333-45259

Gentlemen:
     
     We  have  examined the Registration Statement for the above  captioned
Fund.
     
     We  hereby consent to the reference in the Prospectus and Registration
Statement for the above captioned Fund to Interactive Data Corporation,  as
the  Evaluator, and to the use of the obligations prepared by us which  are
referred to in such Prospectus and Statement.
     
     You  are  authorized to file copies of this letter with the Securities
and Exchange Commission.

Very truly yours,

James Perry
Vice President

                                                                     Exhibit 4.2

Standard & Poor's
A division of The McGraw-Hill Companies, Inc.
25 Broadway
New York, New York  10004-1064

Van Kampen Funds Inc.
One Parkview Plaza
Oakbrook Terrace, Illinois  60181

Re:  Insured Municipals Income Trust, 233rd Insured Multi-Series - consisting
of:  California Insured Municipals Income Trust, Series 174
     Michigan Insured Municipals Income Trust, Series 151
     New Jersey Insured Municipals Income Trust, Series 123
     
     Pursuant  to your request for a Standard & Poor's rating on the units  of
the  above-captioned trust, SEC #333-45259, we have reviewed  the  information
presented to us and have assigned a 'AAA' rating to the units of the trust and
a  'AAA'  rating to the securities contained in the trust for as long as  they
remain in the trust.  The ratings are direct reflections, of the portfolio  of
the  trust,  which  will  be  composed solely of securities  covered  by  bond
insurance policies that insure against default in the payment of principal and
interest  on the securities so long as they remain in the trust.   Since  such
policies  have been issued by one or more insurance companies which have  been
assigned a 'AAA' claims paying ability rating by S&P, S&P has assigned a 'AAA'
rating to the units of the trust and to the securities contained in the  trust
for as long as they remain in the trust.
     
     Standard  &  Poor's will maintain surveillance on the "AAA" Rating  Until
August 29, 1999.  On this date, the rating will be automatically withdrawn  by
Standard & Poor's unless a post effective letter is requested by the trust.
     
     You  have permission to use the name of Standard & Poor's Corporation and
the   above-assigned  ratings  in  connection  with  your   dissemination   of
information relating to these units, provided that it is understood  that  the
ratings are not "market" ratings nor recommendations to buy, hold, or sell the
units  of  the  trust or the securities contained in the trust.   Further,  it
should  be  understood the rating on the units does not take into account  the
extent  to  which  fund expenses or portfolio asset sales for  less  than  the
fund's  purchase price will reduce payment to the unit holders of the interest
and  principal required to be paid on the portfolio assets.  S&P reserves  the
right  to  advise its own clients, subscribers, and the public of the ratings.
S&P  relies on the sponsor and its counsel, accountants, and other experts for
the  accuracy and completeness of the information submitted in connection with
the  ratings.  S&P does not independently verify the truth or accuracy of  any
such information.
     
     This  letter evidences our consent to the use of the name of  Standard  &
Poor's Corporation in connection with the rating assigned to the units in  the
registration  statement  or prospectus relating to the  units  or  the  trust.
However,  this letter should not be construed as a consent by us,  within  the
meaning of Section 7 of the Securities Act of 1933, to the use of the name  of
Standard & Poor's Corporation in connection with the ratings assigned  to  the
securities contained in the trust.  You are hereby authorized to file  a  copy
of this letter with the Securities and Exchange Commission.
     
     Please  be  certain to send us three copies of your final  prospectus  as
soon  as it becomes available.  Should we not receive them within a reasonable
time  after the closing or should they not conform to the representations made
to us, we reserve the right to withdraw the rating.
     
     We  are pleased to have had the opportunity to be of service to you.   If
we can be of further help, please do not hesitate to call upon us.

                                    Sincerely,
                                    
                                    Sanford B. Bragg
                                    Managing Director


                                                                     Exhibit 4.3

            Independent Certified Public Accountants' Consent
     
     We have issued our report dated July 29, 1998 on the statements of
condition and related bond portfolios of Insured Municipals Income Trust,
233rd Insured Multi-Series (California IM-IT, Michigan IM-IT, and New
Jersey IM-IT Trusts) as of July 29, 1998 contained in the Registration
Statement on Form S-6 and Prospectus.  We consent to the use of our
report in the Registration Statement and Prospectus and to the use of our
name as it appears under the caption "Trust Administration-Independent
Certified Public Accountants" in Part II of the Prospectus.

                                    Grant Thornton LLP

Chicago, Illinois
July 29, 1998

<TABLE> <S> <C>

<ARTICLE> 6
<LEGEND>
This report reflects the current time period taken from 487 on July 29, 1998.
It is unaudited
</LEGEND>
<SERIES>
<NUMBER> 174
<NAME> I-CA
       
<S>                                                           <C>
<PERIOD-TYPE>                                                 YEAR
<FISCAL-YEAR-END>                                             JUN-30-1999
<PERIOD-START>                                                JUL-29-1998
<PERIOD-END>                                                  JUL-29-1998
<INVESTMENTS-AT-COST>                                         2,847,304
<INVESTMENTS-AT-VALUE>                                        2,847,304
<RECEIVABLES>                                                 36,703
<ASSETS-OTHER>                                                0
<OTHER-ITEMS-ASSETS>                                          0
<TOTAL-ASSETS>                                                2,884,007
<PAYABLE-FOR-SECURITIES>                                      0
<SENIOR-LONG-TERM-DEBT>                                       0
<OTHER-ITEMS-LIABILITIES>                                     36,703
<TOTAL-LIABILITIES>                                           36,703
<SENIOR-EQUITY>                                               0
<PAID-IN-CAPITAL-COMMON>                                      2,847,304
<SHARES-COMMON-STOCK>                                         2,994
<SHARES-COMMON-PRIOR>                                         0
<ACCUMULATED-NII-CURRENT>                                     0
<OVERDISTRIBUTION-NII>                                        0
<ACCUMULATED-NET-GAINS>                                       0
<OVERDISTRIBUTION-GAINS>                                      0
<ACCUM-APPREC-OR-DEPREC>                                      0
<NET-ASSETS>                                                  2,847,304
<DIVIDEND-INCOME>                                             0
<INTEREST-INCOME>                                             0
<OTHER-INCOME>                                                0
<EXPENSES-NET>                                                0
<NET-INVESTMENT-INCOME>                                       0
<REALIZED-GAINS-CURRENT>                                      0
<APPREC-INCREASE-CURRENT>                                     0
<NET-CHANGE-FROM-OPS>                                         0
<EQUALIZATION>                                                0
<DISTRIBUTIONS-OF-INCOME>                                     0
<DISTRIBUTIONS-OF-GAINS>                                      0
<DISTRIBUTIONS-OTHER>                                         0
<NUMBER-OF-SHARES-SOLD>                                       0
<NUMBER-OF-SHARES-REDEEMED>                                   0
<SHARES-REINVESTED>                                           0
<NET-CHANGE-IN-ASSETS>                                        0
<ACCUMULATED-NII-PRIOR>                                       0
<ACCUMULATED-GAINS-PRIOR>                                     0
<OVERDISTRIB-NII-PRIOR>                                       0
<OVERDIST-NET-GAINS-PRIOR>                                    0
<GROSS-ADVISORY-FEES>                                         0
<INTEREST-EXPENSE>                                            0
<GROSS-EXPENSE>                                               0
<AVERAGE-NET-ASSETS>                                          0
<PER-SHARE-NAV-BEGIN>                                         0
<PER-SHARE-NII>                                               0
<PER-SHARE-GAIN-APPREC>                                       0
<PER-SHARE-DIVIDEND>                                          0
<PER-SHARE-DISTRIBUTIONS>                                     0
<RETURNS-OF-CAPITAL>                                          0
<PER-SHARE-NAV-END>                                           0
<EXPENSE-RATIO>                                               0
<AVG-DEBT-OUTSTANDING>                                        0
<AVG-DEBT-PER-SHARE>                                          0
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<LEGEND>
This report reflects the current time period taken from 487 on July 29, 1998.
It is unaudited
</LEGEND>
<SERIES>
<NUMBER> 151
<NAME> I-MI
       
<S>                                                               <C>
<PERIOD-TYPE>                                                     YEAR
<FISCAL-YEAR-END>                                                 JUN-30-1999
<PERIOD-START>                                                    JUL-29-1998
<PERIOD-END>                                                      JUL-29-1998
<INVESTMENTS-AT-COST>                                             2,902,455
<INVESTMENTS-AT-VALUE>                                            2,902,455
<RECEIVABLES>                                                     33,520
<ASSETS-OTHER>                                                    0
<OTHER-ITEMS-ASSETS>                                              0
<TOTAL-ASSETS>                                                    2,935,975
<PAYABLE-FOR-SECURITIES>                                          0
<SENIOR-LONG-TERM-DEBT>                                           0
<OTHER-ITEMS-LIABILITIES>                                         33,520
<TOTAL-LIABILITIES>                                               33,520
<SENIOR-EQUITY>                                                   0
<PAID-IN-CAPITAL-COMMON>                                          2,902,455
<SHARES-COMMON-STOCK>                                             3,052
<SHARES-COMMON-PRIOR>                                             0
<ACCUMULATED-NII-CURRENT>                                         0
<OVERDISTRIBUTION-NII>                                            0
<ACCUMULATED-NET-GAINS>                                           0
<OVERDISTRIBUTION-GAINS>                                          0
<ACCUM-APPREC-OR-DEPREC>                                          0
<NET-ASSETS>                                                      2,902,455
<DIVIDEND-INCOME>                                                 0
<INTEREST-INCOME>                                                 0
<OTHER-INCOME>                                                    0
<EXPENSES-NET>                                                    0
<NET-INVESTMENT-INCOME>                                           0
<REALIZED-GAINS-CURRENT>                                          0
<APPREC-INCREASE-CURRENT>                                         0
<NET-CHANGE-FROM-OPS>                                             0
<EQUALIZATION>                                                    0
<DISTRIBUTIONS-OF-INCOME>                                         0
<DISTRIBUTIONS-OF-GAINS>                                          0
<DISTRIBUTIONS-OTHER>                                             0
<NUMBER-OF-SHARES-SOLD>                                           0
<NUMBER-OF-SHARES-REDEEMED>                                       0
<SHARES-REINVESTED>                                               0
<NET-CHANGE-IN-ASSETS>                                            0
<ACCUMULATED-NII-PRIOR>                                           0
<ACCUMULATED-GAINS-PRIOR>                                         0
<OVERDISTRIB-NII-PRIOR>                                           0
<OVERDIST-NET-GAINS-PRIOR>                                        0
<GROSS-ADVISORY-FEES>                                             0
<INTEREST-EXPENSE>                                                0
<GROSS-EXPENSE>                                                   0
<AVERAGE-NET-ASSETS>                                              0
<PER-SHARE-NAV-BEGIN>                                             0
<PER-SHARE-NII>                                                   0
<PER-SHARE-GAIN-APPREC>                                           0
<PER-SHARE-DIVIDEND>                                              0
<PER-SHARE-DISTRIBUTIONS>                                         0
<RETURNS-OF-CAPITAL>                                              0
<PER-SHARE-NAV-END>                                               0
<EXPENSE-RATIO>                                                   0
<AVG-DEBT-OUTSTANDING>                                            0
<AVG-DEBT-PER-SHARE>                                              0
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<LEGEND>
This report reflects the current time period taken from 487 on July 29, 1998.
It is unaudited
</LEGEND>
<SERIES>
<NUMBER> 123
<NAME> I-NJ
       
<S>                                                                    <C>
<PERIOD-TYPE>                                                          YEAR
<FISCAL-YEAR-END>                                                      JUN-30-1999
<PERIOD-START>                                                         JUL-29-1998
<PERIOD-END>                                                           JUL-29-1998
<INVESTMENTS-AT-COST>                                                  2,904,360
<INVESTMENTS-AT-VALUE>                                                 2,904,360
<RECEIVABLES>                                                          28,172
<ASSETS-OTHER>                                                         0
<OTHER-ITEMS-ASSETS>                                                   0
<TOTAL-ASSETS>                                                         2,932,532
<PAYABLE-FOR-SECURITIES>                                               0
<SENIOR-LONG-TERM-DEBT>                                                0
<OTHER-ITEMS-LIABILITIES>                                              28,172
<TOTAL-LIABILITIES>                                                    28,172
<SENIOR-EQUITY>                                                        0
<PAID-IN-CAPITAL-COMMON>                                               2,904,360
<SHARES-COMMON-STOCK>                                                  3,054
<SHARES-COMMON-PRIOR>                                                  0
<ACCUMULATED-NII-CURRENT>                                              0
<OVERDISTRIBUTION-NII>                                                 0
<ACCUMULATED-NET-GAINS>                                                0
<OVERDISTRIBUTION-GAINS>                                               0
<ACCUM-APPREC-OR-DEPREC>                                               0
<NET-ASSETS>                                                           2,904,360
<DIVIDEND-INCOME>                                                      0
<INTEREST-INCOME>                                                      0
<OTHER-INCOME>                                                         0
<EXPENSES-NET>                                                         0
<NET-INVESTMENT-INCOME>                                                0
<REALIZED-GAINS-CURRENT>                                               0
<APPREC-INCREASE-CURRENT>                                              0
<NET-CHANGE-FROM-OPS>                                                  0
<EQUALIZATION>                                                         0
<DISTRIBUTIONS-OF-INCOME>                                              0
<DISTRIBUTIONS-OF-GAINS>                                               0
<DISTRIBUTIONS-OTHER>                                                  0
<NUMBER-OF-SHARES-SOLD>                                                0
<NUMBER-OF-SHARES-REDEEMED>                                            0
<SHARES-REINVESTED>                                                    0
<NET-CHANGE-IN-ASSETS>                                                 0
<ACCUMULATED-NII-PRIOR>                                                0
<ACCUMULATED-GAINS-PRIOR>                                              0
<OVERDISTRIB-NII-PRIOR>                                                0
<OVERDIST-NET-GAINS-PRIOR>                                             0
<GROSS-ADVISORY-FEES>                                                  0
<INTEREST-EXPENSE>                                                     0
<GROSS-EXPENSE>                                                        0
<AVERAGE-NET-ASSETS>                                                   0
<PER-SHARE-NAV-BEGIN>                                                  0
<PER-SHARE-NII>                                                        0
<PER-SHARE-GAIN-APPREC>                                                0
<PER-SHARE-DIVIDEND>                                                   0
<PER-SHARE-DISTRIBUTIONS>                                              0
<RETURNS-OF-CAPITAL>                                                   0
<PER-SHARE-NAV-END>                                                    0
<EXPENSE-RATIO>                                                        0
<AVG-DEBT-OUTSTANDING>                                                 0
<AVG-DEBT-PER-SHARE>                                                   0
        

</TABLE>


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