MUNI INVEST TR FD INV GR PORT BBB OR BET LNG INT TRM SE DAF
485BPOS, 2000-02-16
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   AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON FEBRUARY 16, 2000

                                                       REGISTRATION NO. 33-57547
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549
                     -------------------------------------

                         POST-EFFECTIVE AMENDMENT NO. 4
                                       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:
                        MUNICIPAL INVESTMENT TRUST FUND
                           INVESTMENT GRADE PORTFOLIO
                            (BBB QUALITY OR BETTER)
                         LONG INTERMEDIATE TERM SERIES
                              DEFINED ASSET FUNDS

B. NAME OF DEPOSITOR:

                   MERRILL LYNCH, PIERCE, FENNER & SMITH INC.
                           SALOMON SMITH BARNEY INC.
                       PRUDENTIAL SECURITIES INCORPORATED
                            PAINEWEBBER INCORPORATED
                           DEAN WITTER REYNOLDS INC.

C. COMPLETE ADDRESSES OF DEPOSITORS' PRINCIPAL EXECUTIVE OFFICES:

 MERRILL LYNCH, PIERCE,
     FENNER & SMITH
      INCORPORATED
   DEFINED ASSET FUNDS
  POST OFFICE BOX 9051
PRINCETON, NJ 08543-9051                              SALOMON SMITH BARNEY INC.
                                                            388 GREENWICH
                                                         STREET--23RD FLOOR
                                                         NEW YORK, NY 10013

<TABLE>
    <S>                          <C>                          <C>
      PRUDENTIAL SECURITIES      PAINEWEBBER INCORPORATED     DEAN WITTER REYNOLDS INC.
          INCORPORATED              1285 AVENUE OF THE             TWO WORLD TRADE
       ONE NEW YORK PLAZA                AMERICAS                CENTER--59TH FLOOR
       NEW YORK, NY 10292           NEW YORK, NY 10019           NEW YORK, NY 10048
</TABLE>

D. NAMES AND COMPLETE ADDRESSES OF AGENTS FOR SERVICE:

  TERESA KONCICK, ESQ.         ROBERT E. HOLLEY           MICHAEL KOCHMANN
      P.O. BOX 9051            1200 HARBOR BLVD.        388 GREENWICH STREET
PRINCETON, NJ 08543-9051      WEEHAWKEN, NJ 07087        NEW YORK, NY 10013

                                  COPIES TO:             DOUGLAS LOWE, ESQ.
                            PIERRE DE SAINT PHALLE,   DEAN WITTER REYNOLDS INC.
   LEE B. SPENCER, JR.               ESQ.                  TWO WORLD TRADE
   ONE NEW YORK PLAZA        450 LEXINGTON AVENUE        CENTER--59TH FLOOR
   NEW YORK, NY 10292         NEW YORK, NY 10017         NEW YORK, NY 10048

The issuer has registered an indefinite number of Units under the Securities Act
of 1933 pursuant to Rule 24f-2 and filed the Rule 24f-2 Notice for the most
recent fiscal year on March 16, 1999.

Check box if it is proposed that this filing will become effective on February
25, 2000 pursuant to paragraph (b) of Rule 485.  /X/

- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
                           DEFINED ASSET FUNDS--REGISTERED TRADEMARK--
                           ----------------------------------------------------

                           MUNICIPAL INVESTMENT TRUST FUND
                           INVESTMENT GRADE PORTFOLIO
                           (BBB QUALITY OR BETTER)
                           (A UNIT INVESTMENT TRUST)
                           -  PORTFOLIO OF INTERMEDIATE TERM MUNICIPAL BONDS
                           -  DESIGNED FOR INCOME FREE FROM REGULAR FEDERAL
                              INCOME TAX
                           -  MONTHLY INCOME DISTRIBUTIONS
                           -  AMT BONDS

SPONSORS:
MERRILL LYNCH,
PIERCE, FENNER & SMITH
INCORPORATED               -----------------------------------------------------
SALOMON SMITH BARNEY INC.  The Securities and Exchange Commission has not
PRUDENTIAL SECURITIES      approved or disapproved these Securities or passed
INCORPORATED               upon the adequacy of this prospectus. Any
PAINEWEBBER INCORPORATED   representation to the contrary is a criminal offense.
DEAN WITTER REYNOLDS INC.  Prospectus dated February 25, 2000.

<PAGE>
- --------------------------------------------------------------------------------

Defined Asset Funds--Registered Trademark--
Defined Asset Funds-Registered Trademark- is America's oldest and largest family
of unit investment trusts, with over $160 billion sponsored over the last 28
years. Defined Asset Funds has been a leader in unit investment trust research
and product innovation. Our family of Funds helps investors work toward their
financial goals with a full range of quality investments, including municipal,
corporate and government bond portfolios, as well as domestic and international
equity portfolios.

Defined Asset Funds offer a number of advantages:
  - A disciplined strategy of buying and holding with a long-term view is the
    cornerstone of Defined Asset Funds.
  - Fixed portfolio: Defined Funds follow a buy and hold investment strategy;
    funds are not managed and portfolio changes are limited.
  - Defined Portfolios: We choose the stocks and bonds in advance, so you know
    what you're investing in.
  - Professional research: Our dedicated research team seeks out stocks or bonds
    appropriate for a particular fund's objectives.
  - Ongoing supervision: We monitor each portfolio on an ongoing basis.
No matter what your investment goals, tolerance for risk or time horizon,
there's probably a Defined Asset Fund that suits your investment style. Your
financial professional can help you select a Defined Asset Fund that works best
for your investment portfolio.

THE FINANCIAL INFORMATION IN THIS PROSPECTUS IS AS OF OCTOBER 31, 1999, THE
EVALUATION DATE.

<TABLE>
<S>                                    <C>
CONTENTS
                                       PAGE
                                       ----
Risk/Return Summary..................     3
What You Can Expect From Your
  Investment.........................     7
  Monthly Income.....................     7
  Return Figures.....................     7
  Records and Reports................     7
The Risks You Face...................     8
  Interest Rate Risk.................     8
  Call Risk..........................     8
  Reduced Diversification Risk.......     8
  Liquidity Risk.....................     8
  Concentration Risk.................     8
  Bond Quality Risk..................     8
  Insurance Related Risk.............     8
  Litigation and Legislation Risks...     8
Selling or Exchanging Units..........     8
  Sponsors' Secondary Market.........     9
  Selling Units to the Trustee.......     9
  Exchange Option....................     9
How The Fund Works...................    10
  Pricing............................    10
  Evaluations........................    10
  Income.............................    10
  Expenses...........................    10
  Portfolio Changes..................    11
  Fund Termination...................    11
  Certificates.......................    12
  Trust Indenture....................    12
  Legal Opinion......................    12
  Auditors...........................    13
  Sponsors...........................    13
  Trustee............................    13
  Underwriters' and Sponsors'
    Profits..........................    13
  Public Distribution................    13
  Code of Ethics.....................    14
  Year 2000 Issues...................    14
Taxes................................    14
Supplemental Information.............    15
Financial Statements.................   D-1
</TABLE>

                                       2
<PAGE>
- --------------------------------------------------------------------------------

RISK/RETURN SUMMARY

<TABLE>
<C>  <S>
 1.  WHAT IS THE FUND'S OBJECTIVE?
     The Fund seeks interest income that is
     exempt from regular federal income taxes
     by investing in a fixed portfolio
     consisting primarily of municipal revenue
     bonds with an estimated average life of 8
     years.

 2.  WHAT ARE MUNICIPAL REVENUE BONDS?
     Municipal revenue bonds are bonds issued
     by states, municipalities and public
     authorities to finance the cost of
     buying, building or improving various
     projects intended to generate revenue,
     such as airports, health care facilities,
     housing and municipal electric, water and
     sewer utilities. Generally, payments on
     these bonds depend solely on the revenues
     generated by the projects, excise taxes
     or state appropriations, and are not
     backed by the government's taxing power.

 3.  WHAT IS THE FUND'S INVESTMENT STRATEGY?

  -  The Fund plans to hold to maturity 12
     intermediate term tax-exempt municipal
     bonds with a current aggregate face
     amount of $12,105,000. The Fund is a unit
     investment trust which means that, unlike
     a mutual fund, the Fund's portfolio is
     not managed.
  -  The bonds in the Fund were selected by
     the agent for the Sponsors with the help
     of Fitch IBCA, Inc., the Credit
     Consultant, which reviewed the bonds
     proposed by the agent for the Sponsors.
     When initially deposited in the Fund,
     each bond was considered to be investment
     grade quality by Fitch. In some cases,
     Standard & Poort's and/or Moody's rated
     the bonds as investment grade. Fitch as
     Credit Consultant has an ongoing
     responsibility to monitor the bonds and
     to inform the agent for the Sponsors if
     in Fitch's opinion any bond no longer has
     investment grade characteristics. If the
     Credit Consultant does not believe it has
     enough information to continue to monitor
     a bond, it may withdraw its opinion as to
     the investment grade quality of the bond
     unless the agent for the Sponsors
     provides adequate information aboaut the
     bond.
  -  Many of the bonds can be called at a
     premium declining over time to par value.
     Some bonds may be called earlier at par
     for extraordinary reasons. None of the
     bonds are currently callable.

  -  12% of the bonds are backed by bank
     letters of credit.

     Letters of credit and insurance guarantee
     timely payments of principal and interest
     on the bonds (but not Fund units or the
     market value of the bonds before they
     mature).

     The Portfolio consists of municipal bonds
     of the following types:
</TABLE>

<TABLE>
  -  General Obligation                        7%
<C>  <S>
  -  Hospitals/Health Care                    11%
  -  Housing                                  12%
  -  Industrial Development Revenue          23%
  -  Lease Rental                              8%
  -  Refunded Bonds                          21%
  -  Special Tax                              10%
  -  Municipal Electric Utilities              8%
</TABLE>

<TABLE>
<C>  <S>
 4.  WHAT ARE THE SIGNIFICANT RISKS?

     YOU CAN LOSE MONEY BY INVESTING IN THE
     FUND. THIS CAN HAPPEN FOR VARIOUS
     REASONS, INCLUDING:
  -  Rising interest rates, an issuer's
     worsening financial condition or a drop
     in bond ratings can reduce the price of
     your units.
  -  Assuming no changes in interest rates,
     when you sell your units, they will
     generally be worth less than your cost
     because your cost included a sales fee.
  -  The Fund will receive early returns of
     principal if bonds are called or sold
     before they mature. If this happens your
     income will decline and you may not be
     able to reinvest the money you receive at
     as high a yield or as long a maturity.

 5.  IS THIS FUND APPROPRIATE FOR YOU?

     Yes, if you want monthly income free from
     regular federal income tax. You will
     benefit from a professionally selected
     and supervised portfolio whose risk is
     reduced by investing in bonds of several
     different issuers.
     The Fund is NOT appropriate for you if
     you want a speculative investment that
     changes to take advantage of market
     movements, if you do not want a
     tax-advantaged investment, if you are
     subject to AMT or if you cannot tolerate
     any risk.
</TABLE>

                                       3
<PAGE>

<TABLE>
<C>  <S>
     DEFINING YOUR INCOME
</TABLE>

<TABLE>
<C>  <S>                                          <C>
     WHAT YOU MAY EXPECT (PAYABLE ON THE 25TH
     DAY OF EACH MONTH):
     Regular Monthly Income per unit               $ 4.95
     Annual Income per unit                        $59.51
     RECORD DAY: 10th day of each month

     THESE FIGURES ARE ESTIMATES ON THE EVALUATION DATE;
     ACTUAL PAYMENTS MAY VARY.
</TABLE>

<TABLE>
<C>  <S>
 6.  WHAT ARE THE FUND'S FEES AND EXPENSES?

     This table shows the costs and expenses
     you may pay, directly or indirectly,
     when you invest in the Fund.

     INVESTOR FEES

     Maximum Sales Fee (Load) on ne
     purchases (as a percentage of
     $1,000 invested)                   2.75%

     Employees of some of the Sponsors and
     their affiliates may be charged a
     reduced sales fee of no less than $5.00
     per Unit.

     The maximum sales fee is reduced if you
     invest at least $100,000, as follows:
</TABLE>

<TABLE>
<CAPTION>
                               YOUR MAXIMUM
                                SALES FEE
          IF YOU INVEST:         WILL BE:
          --------------       ------------
<C>  <S>                       <C>
     Less than $100,000            2.75%
     $100,000 to $249,999          2.50%
     $250,000 to $499,999          2.25%
     $500,000 to $999,999          2.00%
     $1,000,000 and over           1.75%

     Maximum Exchange Fee          1.75%
</TABLE>

<TABLE>
                                                     $0.68
     Trustee's Fee
                                                     $0.20
     Portfolio Supervision,
     Bookkeeping and
     Administrative Fees
     (including updating
     expenses)
<CAPTION>
     ESTIMATED ANNUAL FUND OPERATING EXPENSES
                                                     AMOUNT
                                                    PER UNIT
                                                    --------
<C>  <S>                                           <C>
                                                     $0.20
     Organization Costs
                                                      0.79
     Credit Consultant's
     Fee
                                                     $0.10
     Evaluator's Fee
                                                     $0.29
     Other Operating Expenses
                                                     -----
                                                     $2.26
     TOTAL
</TABLE>

<TABLE>
<C>  <S>
     The Sponsors historically paid
     organization costs and updating
     expenses.

 7.  IS THE FUND MANAGED?

     Unlike a mutual fund, the Fund is not
     managed and bonds are not sold because
     of market changes. Rather, experienced
     Defined Asset Funds financial analysts
     regularly review the bonds in the Fund.
     The Fund may sell a bond if certain
     adverse credit or other conditions
     exist.

 8.  HOW DO I BUY UNITS?

     You can buy units from any of the
     Sponsors and other broker-dealers. The
     Sponsors are listed later in this
     prospectus. Some banks may offer units
     for sale through special arrangements
     with the Sponsors, although certain
     legal restrictions may apply.

     The minimum investment is one unit.

     UNIT PRICE PER UNIT           $1,038.78
     (as of October 31, 1999)

     Unit price is based on the net asset
     value of the Fund plus the sales fee.
     An amount equal to any principal cash,
     as well as net accrued but
     undistributed interest on the unit, is
     added to the unit price. An independent
     evaluator prices the bonds at 3:30 p.m.
     Eastern time every business day. Unit
     price changes every day with changes in
     the prices of the bonds in the Fund.
</TABLE>

                                       4
<PAGE>
<TABLE>
<C>  <S>
 9.  HOW DO I SELL UNITS?

     You may sell your units at any time to
     any Sponsor or the Trustee for the net
     asset value determined at the close of
     business on the date of sale, less any
     remaining deferred
     sales fee. You will not pay any other
     fee
     when you sell your units.

10.  HOW ARE DISTRIBUTIONS MADE AND TAXED?

     The Fund pays income monthly. In the
     opinion of bond counsel when each bond
     was issued, interest on the bonds in
     this Fund is generally 100% exempt from
     regular federal income tax.
     Interest on approximately 23% of the
     bonds will be taken into account in
     determining your preference items for
     alternative minimum tax purposes. A
     portion of the income may also be
     exempt from state and local personal
     income taxes, depending on where you
     live.

     You will also receive principal
     payments if bonds are sold or called or
     mature, when the cash available is more
     than $5.00 per unit. You will be
     subject to tax on any gain realized by
     the Fund on the disposition of bonds.

11.  WHAT OTHER SERVICES ARE AVAILABLE?

     REINVESTMENT
     You will receive your monthly income in
     cash unless you choose to compound your
     income by reinvesting with no sales fee
     in the Municipal Fund Investment
     Accumulation Program, Inc. This program
     is an open-end mutual fund with a
     comparable investment objective. Income
     from this program will generally be
     subject to state and local income
     taxes. FOR MORE COMPLETE INFORMATION
     ABOUT THE PROGRAM, INCLUDING CHARGES
     AND FEES, ASK THE TRUSTEE FOR THE
     PROGRAM'S PROSPECTUS. READ IT CAREFULLY
     BEFORE YOU INVEST. THE TRUSTEE MUST
     RECEIVE YOUR WRITTEN ELECTION TO
     REINVEST AT LEAST 10 DAYS BEFORE THE
     RECORD DAY OF AN INCOME PAYMENT.

     EXCHANGE PRIVILEGES
     You may exchange units of this Fund for
     units of certain other Defined Asset
     Funds. You may also exchange into this
     Fund from certain other funds. We
     charge a reduced sales fee on
     exchanges.
</TABLE>

                                       5
<PAGE>
- --------------------------------------------------------------------------------
    TAX-FREE VS. TAXABLE INCOME: A COMPARISON OF TAXABLE AND TAX-FREE YIELDS

<TABLE>
                                      EFFECTIVE
TAXABLE INCOME 2000*                  % TAX                                  TAX-FREE YIELD OF
  SINGLE RETURN      JOINT RETURN     BRACKET      3%        3.5%        4%        4.5%        5%        5.5%        6%
                                                                    IS EQUIVALENT TO A TAXABLE YIELD OF
<S>                <C>                <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>
- ---------------------------------------------------------------------------------------------------------------------------
$      0- 26,250   $      0- 43,850    15.00       3.53       4.12       4.71       5.29       5.88       6.47       7.06
- ---------------------------------------------------------------------------------------------------------------------------
$ 26,251- 63,550   $ 43,851-105,950    28.00       4.17       4.86       5.56       6.25       6.94       7.64       8.33
- ---------------------------------------------------------------------------------------------------------------------------
$ 63,551-132,600   $105,951-161,450    31.00       4.35       5.07       5.80       6.52       7.25       7.97       8.70
- ---------------------------------------------------------------------------------------------------------------------------
<S>                <C>                <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>
$132,601-288,350   $161,451-288,350    36.00       4.69       5.47       6.25       7.03       7.81       8.59       9.38
- ---------------------------------------------------------------------------------------------------------------------------
<S>                <C>                <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>
  OVER $288,350    OVER $288,350       39.60       4.97       5.79       6.62       7.45       8.28       9.11       9.93
- ---------------------------------------------------------------------------------------------------------------------------
<S>                <C>                <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>

<S>                <C>
TAXABLE INCOME 20
  SINGLE RETURN     6.5%
                      IS
                   EQUIVALENT
                     TO A
                   TAXABLE
                   YIELD OF
- -----------------
$      0- 26,250     7.65
- -----------------
$ 26,251- 63,550     9.03
- -----------------
$ 63,551-132,600     9.42
                   --------
- -----------------
$132,601-288,350    10.16
                   --------
- -----------------
  OVER $288,350     10.76
                   --------
- -----------------
</TABLE>

To compare the yield of a taxable security with the yield of a federally
tax-free security, find your taxable income and read across. The table
incorporates 2000 federal income tax rates and assumes that all income would
otherwise be taxed at a U.S. investor's highest tax rate. Yield figures are for
example only.

*Based upon net amount subject to federal income tax after deductions and
exemptions. This table does not reflect the possible effect of other tax
factors, such as alternative minimum tax, personal exemptions, the phase-out of
exemptions, itemized deductions, the possible partial disallowance of deductions
or state and local taxation. Consequently, investors are urged to consult their
own tax advisers in this regard.

                MUNICIPAL BONDS AND THE ALTERNATIVE MINIMUM TAX

<TABLE>
       INCOME+             MAXIMUM "PREFERENCE" INCOME
                              WITHOUT TRIGGERING AMT
                             (STATE INCOME TAX RATES)
SINGLE ++   JOINT ++        0%          7%         11%
<S>         <C>         <C>         <C>         <C>
- ----------------------------------------------------------
            $50,000      $20,000     $15,000     $13,000
- ----------------------------------------------------------
$30,000                  $19,000     $16,000     $14,000
- ----------------------------------------------------------
            $100,000     $24,000     $15,000     $11,000
- ----------------------------------------------------------
$55,000                  $21,000     $16,000     $13,000
- ----------------------------------------------------------
            $225,000     $30,000     $12,000     $ 3,000
- ----------------------------------------------------------
$205,000                 $30,000     $14,000     $ 6,000
- ----------------------------------------------------------
</TABLE>

NOTES:
 + Regular taxable income plus state income taxes
   and personal exemptions.
 ++ Assuming no dependents.
Under federal tax law, interest income on certain municipal bonds, although
exempt from regular income tax, is treated as a "preference" item for purposes
of AMT. The table above shows amounts of such municipal bond "preference"
interest income, assuming no other "preference" or similar items apply, that
individual taxpayers could receive in 2000 without becoming subject to the AMT.
The table gives information for single and joint returns of U.S. individuals
having no dependents. The table provides three income levels and three
hypothetical state income tax rates. The table further assumes that the stated
amount of municipal bond "preference" interest income is subject to state income
taxes.

                                       6
<PAGE>
WHAT YOU CAN EXPECT FROM YOUR INVESTMENT

MONTHLY INCOME

The Fund will pay you regular monthly income. Your monthly income may vary
because of:
  - elimination of one or more bonds from the Fund's portfolio because of calls,
    redemptions or sales;
  - a change in the Fund's expenses; or
  - the failure by a bond's issuer to pay interest.

Changes in interest rates generally will not affect your monthly income because
the portfolio is fixed.

Along with your monthly income, you will receive your share of any available
bond principal.

RETURN FIGURES

We cannot predict your actual return, which will vary with unit price, how long
you hold your investment and changes in the portfolio, interest income and
expenses.

ESTIMATED CURRENT RETURN equals the estimated annual cash to be received from
the bonds in the Fund less estimated annual Fund expenses, divided by the Unit
Price (including the maximum sales fee):

<TABLE>
<S>              <C>  <C>
Estimated Annual         Estimated
Interest Income   -   Annual Expenses
- -------------------------------------
             Unit Price
</TABLE>

ESTIMATED LONG TERM RETURN is a measure of the estimated return over the
estimated life of the Fund. Unlike Estimated Current Return, Estimated Long Term
Return reflects maturities, discounts and premiums of the bonds in the Fund. It
is an average of the yields to maturity (or in certain cases, to an earlier call
date) of the individual bonds in the portfolio, adjusted to reflect the Fund's
maximum sales fee and estimated expenses. We calculate the average yield for the
portfolio by weighting each bond's yield by its market value and the time
remaining to the call or maturity date.

Yields on individual bonds depend on many factors including general conditions
of the bond markets, the size of a particular offering and the maturity and
quality rating of the particular issues. Yields can vary among bonds with
similar maturities, coupons and ratings.

These return quotations are designed to be comparative rather than predictive.

RECORDS AND REPORTS

You will receive:
- - a monthly statement of income payments and any principal payments;
- - a notice from the Trustee when new bonds are deposited in exchange or
  substitution for bonds originally deposited;
- - an annual report on Fund activity; and
- - annual tax information. THIS WILL ALSO BE SENT TO THE IRS. YOU MUST REPORT THE
  AMOUNT OF TAX-EXEMPT INTEREST RECEIVED DURING THE YEAR.

You may request:
- - copies of bond evaluations to enable you to comply with federal and state tax
  reporting requirements; and
- - audited financial statements of the Fund.

You may inspect records of Fund transactions at the Trustee's office during
regular business hours.

                                       7
<PAGE>
THE RISKS YOU FACE

INTEREST RATE RISK

Investing involves risks, including the risk that your investment will decline
in value if interest rates rise. Generally, bonds with longer maturities will
change in value more than bonds with shorter maturities. Bonds in the Fund are
more likely to be called when interest rates decline. This would result in early
returns of principal to you and may result in early termination of the Fund. Of
course, we cannot predict how interest rates may change.

CALL RISK

Many bonds can be prepaid or "called" by the issuer before their stated
maturity.

For example, an issuer might call its bonds if it no longer needs the money for
the original purpose or, during periods of falling interest rates, if the
issuer's bonds have a coupon higher than current market rates. If the bonds are
called, your income will decline and you may not be able to reinvest the money
you receive at as high a yield or as long a maturity. An early call at par of a
premium bond will reduce your return.

REDUCED DIVERSIFICATION RISK

If many investors sell their units, the Fund will have to sell bonds. This could
reduce the diversification of your investment and increase your share of Fund
expenses.

LIQUIDITY RISK

The bonds will generally trade in the over-the-counter market. We cannot assure
you that a liquid trading market will exist, especially since current law may
restrict the Fund from selling bonds to any Sponsor. The value of the bonds, and
of your investment, may be reduced if trading in bonds is limited or absent.

CONCENTRATION RISK

When a certain type of bond makes up 25% or more of the portfolio, the Fund is
said to be "concentrated" in that bond type, which makes the Fund less
diversified. However, this Fund is not concentrated in any particular type of
bond.

BOND QUALITY RISK

A reduction in a bond's rating may decrease its value and, indirectly, the value
of your investment in the Fund.

LITIGATION AND LEGISLATION RISKS

We do not know of any pending litigation that might have a material adverse
effect upon the Fund.

Future tax legislation could affect the value of the portfolio by:
  - limiting real property taxes,
  - reducing tax rates,
  - imposing a flat or other form of tax, or
  - exempting investment income from tax.

SELLING OR EXCHANGING UNITS

You can sell your units at any time for a price based on net asset value. Your
net asset value is calculated each business day by:
  - ADDING the value of the bonds, net accrued interest, cash and any other Fund
    assets;
  - SUBTRACTING accrued but unpaid Fund expenses, unreimbursed Trustee advances,
    cash held to buy back units or for distribution to investors and any other
    Fund liabilities; and
  - DIVIDING the result by the number of outstanding units.

                                       8
<PAGE>
Your net asset value when you sell may be more or less than your cost because of
sales fees, market movements and changes in the portfolio.

SPONSORS' SECONDARY MARKET

While we are not obligated to do so, we will buy back units at net asset value
without any other fee or charge. We may resell the units to other buyers or to
the Trustee. You should consult your financial professional for current market
prices to determine if other broker-dealers or banks are offering higher prices.

We have maintained a secondary market continuously for over 25 years, but we
could discontinue it without prior notice for any business reason.

SELLING UNITS TO THE TRUSTEE

Regardless of whether we maintain a secondary market, you can sell your units to
the Trustee at any time by sending the Trustee a letter (with any outstanding
certificates if you hold unit certificates). You must properly endorse your
certificates (or execute a written transfer instrument with signatures
guaranteed by an eligible institution). Sometimes, additional documents are
needed such as a trust document, certificate of corporate authority, certificate
of death or appointment as executor, administrator or guardian.

Within seven days after your request and the necessary documents are received,
the Trustee will mail a check to you. Contact the Trustee for additional
information.

As long as we are maintaining a secondary market, the Trustee will sell your
units to us at a price based on net asset value. If there is no secondary
market, the Trustee may sell your units in the over-the-counter market for a
higher price, but it is not obligated to do so. In that case, you will receive
the net proceeds of the sale.

If the Fund does not have cash available to pay you for units you are selling,
the agent for the Sponsors will select bonds to be sold. Bonds will be selected
based on market and credit factors. These sales could be made at times when the
bonds would not otherwise be sold and may result in your receiving less than the
unit par value and also reduce the size and diversity of the Fund.

There could be a delay in paying you for your units:
  - if the New York Stock Exchange is closed (other than customary weekend and
    holiday closings);
  - if the SEC determines that trading on the New York Stock Exchange is
    restricted or that an emergency exists making sale or evaluation of the
    bonds not reasonably practicable; and
  - for any other period permitted by SEC order.

EXCHANGE OPTION

You may exchange units of certain Defined Asset Funds for units of this Fund at
a maximum exchange fee of 1.75%. You may exchange units of this Fund for units
of certain other funds at a reduced sales fee if your investment goals change.
To exchange units, you should talk to your financial professional about what
funds are exchangeable, suitable and currently available.

Normally, an exchange is taxable and you must recognize any gain or loss on the
exchange. However, the IRS may try to disallow a loss if the portfolios of the
two

                                       9
<PAGE>
funds are not materially different; you should consult your own tax adviser.

We may amend or terminate this exchange option at any time without notice.

HOW THE FUND WORKS

PRICING

The price of a unit includes interest accrued on the bonds, less expenses, from
the most recent Record Day up to, but not including, the settlement date, which
is usually three business days after the purchase date of the unit.

A portion of the price of a unit consists of cash so that the Trustee can
provide you with regular monthly income. When you sell your units you will
receive your share of this cash.

In addition, as with mutual funds, the Fund (and therefore the investors) pay
all or some of the costs of organizing the Fund including:
  - cost of initial preparation of legal documents;
  - federal and state registration fees;
  - initial fees and expenses of the Trustee;
  - initial audit; and
  - legal expenses and other out-of-pocket expenses.

These costs are amortized over the first five years of the Fund.

EVALUATIONS

An independent Evaluator values the bonds on each business day (excluding
Saturdays, Sundays and the following holidays as observed by the New York Stock
Exchange: New Year's Day, Presidents' Day, Martin Luther King, Jr. Day, Good
Friday, Memorial Day, Independence Day, Labor Day, Thanksgiving and Christmas).
Bond values are based on current bid or offer prices for the bonds or comparable
bonds. In the past, the difference between bid and offer prices of publicly
offered tax-exempt bonds has ranged from 0.5% of face amount on actively traded
issues to 3.5% on inactively traded issues; the difference has averaged between
1 and 2%.

INCOME

The Trustee credits interest to an Income Account and other receipts to a
Capital Account. The Trustee may establish a Reserve Account by withdrawing from
these accounts amounts it considers appropriate to pay any material liability.
These accounts do not bear interest.

EXPENSES

The Trustee is paid monthly. It also benefits when it holds cash for the Fund in
non-interest bearing accounts. The Trustee may also receive additional amounts:
  - to reimburse the Trustee for the Fund's operating expenses;
  - for extraordinary services and costs of indemnifying the Trustee and the
    Sponsors;
  - costs of actions taken to protect the Fund and other legal fees and
    expenses;
  - expenses for keeping the Fund's registration statement current; and
  - Fund termination expenses and any governmental charges.

The Sponsors are currently reimbursed up to 55 CENTS per $1,000 face amount
annually for providing portfolio supervisory, bookkeeping and administrative
services and for any other expenses properly chargeable to the Fund. Legal,
typesetting, electronic filing and regulatory filing fees and expenses

                                       10
<PAGE>
associated with updating the Portfolio's registration statement yearly are also
now chargeable to the Portfolio. While this fee may exceed the amount of these
costs and expenses attributable to this Fund, the total of these fees for all
Series of Defined Asset Funds will not exceed the aggregate amount attributable
to all of these Series for any calendar year. The Fund also pays the Evaluator's
fees.

The Trustee's, Credit Consultant's, Sponsors' and Evaluator's fees may be
adjusted for inflation without investors' approval.

The Sponsors will pay advertising and selling expenses at no charge to the Fund.
If Fund expenses exceed initial estimates, the Fund will owe the excess. The
Trustee has a lien on Fund assets to secure reimbursement of Fund expenses and
may sell bonds if cash is not available.

PORTFOLIO CHANGES

The Sponsors and Trustee are not liable for any default or defect in a bond.

Unlike a mutual fund, the portfolio is designed to remain intact and we may keep
bonds in the portfolio even if their credit quality declines or other adverse
financial circumstances occur. However, we may sell a bond in certain cases if
we believe that certain adverse credit conditions exist or if a bond becomes
taxable.

If we maintain a secondary market in units but are unable to sell the units that
we buy in the secondary market, we will redeem units, which may affect the
composition of the portfolio. Units offered in the secondary market may not
represent the same face amount of bonds that they did originally.

We decide whether or not to offer units for sale that we acquire in the
secondary market after reviewing:
  - diversity of the portfolio;
  - size of the Fund relative to its original size;
  - ratio of Fund expenses to income;
  - current and long-term returns;
  - degree to which units may be selling at a premium over par; and
  - cost of maintaining a current prospectus.

FUND TERMINATION

The Fund will terminate following the stated maturity or sale of the last bond
in the portfolio. The Fund may also terminate earlier with the consent of
investors holding 51% of the units or if total assets of the Fund have fallen
below 40% of the face amount of bonds deposited. We will decide whether to
terminate the Fund early based on the same factors used in deciding whether or
not to offer units in the secondary market.

When the Fund is about to terminate you will receive a notice, and you will be
unable to sell your units after that time. On or shortly before termination, we
will sell any remaining bonds, and you will receive your final distribution. Any
bond that cannot be sold at a reasonable price may continue to be held by the
Trustee in a liquidating trust pending its final sale.

You will pay your share of the expenses associated with termination, including
brokerage costs in selling bonds. This may reduce the amount you receive as your
final distribution.

                                       11
<PAGE>
CERTIFICATES

Certificates for units are issued on request. You may transfer certificates by
complying with the requirements for redeeming certificates, described above. You
can replace lost or mutilated certificates by delivering satisfactory indemnity
and paying the associated costs.

TRUST INDENTURE

The Fund is a "unit investment trust" governed by a Trust Indenture, a contract
among the Sponsors, the Trustee and the Evaluator, which sets forth their duties
and obligations and your rights. A copy of the Indenture is available to you on
request to the Trustee. The following summarizes certain provisions of the
Indenture.

The Sponsors and the Trustee may amend the Indenture without your consent:
  - to cure ambiguities;
  - to correct or supplement any defective or inconsistent provision;
  - to make any amendment required by any governmental agency; or
  - to make other changes determined not to be materially adverse to your best
    interest (as determined by the Sponsors).

Investors holding 51% of the units may amend the Indenture. Every investor must
consent to any amendment that changes the 51% requirement. No amendment may
reduce your interest in the Fund without your written consent.

The Trustee may resign by notifying the Sponsors. The Sponsors may remove the
Trustee without your consent if:
  - it fails to perform its duties and the Sponsors determine that its
    replacement is in your best interest; or
  - it becomes incapable of acting or bankrupt or its affairs are taken over by
    public authorities.

Investors holding 51% of the units may remove the Trustee. The Evaluator may
resign or be removed by the Sponsors and the Trustee without the consent of
investors. The resignation or removal of either becomes effective when a
successor accepts appointment. The Sponsors will try to appoint a successor
promptly; however, if no successor has accepted within 30 days after notice of
resignation, the resigning Trustee or Evaluator may petition a court to appoint
a successor.

Any Sponsor may resign as long as one Sponsor with a net worth of $2 million
remains and agrees to the resignation. The remaining Sponsors and the Trustee
may appoint a replacement. If there is only one Sponsor and it fails to perform
its duties or becomes bankrupt the Trustee may:
  - remove it and appoint a replacement Sponsor;
  - liquidate the Fund; or
  - continue to act as Trustee without a Sponsor.

Merrill Lynch, Pierce, Fenner & Smith Incorporated acts as agent for the
Sponsors.

The Trust Indenture contains customary provisions limiting the liability of the
Trustee, the Sponsors and the Evaluator.

LEGAL OPINION

Davis Polk & Wardwell, 450 Lexington Avenue, New York, New York 10017, as
special counsel for the Sponsors, has given an opinion that the units are
validly issued.

                                       12
<PAGE>
AUDITORS

Deloitte & Touche LLP, 2 World Financial Center, New York, New York 10281,
independent accountants, audited the Statement of Condition included in this
prospectus.

SPONSORS

The Sponsors are:
MERRILL LYNCH, PIERCE, FENNER & SMITH INCORPORATED (a wholly-owned subsidiary of
Merrill Lynch & Co., Inc.)
P.O. Box 9051,
Princeton, NJ 08543-9051
SALOMON SMITH BARNEY INC. (an indirectly wholly-owned subsidiary of Citigroup
Inc.)
388 Greenwich Street--23rd Floor,
New York, NY 10013
DEAN WITTER REYNOLDS INC. (a principal operating subsidiary of Morgan Stanley
Dean Witter & Co.)
Two World Trade Center--59th Floor,
New York, NY 10048
PRUDENTIAL SECURITIES INCORPORATED (an indirect wholly-owned subsidiary of the
Prudential Insurance Company of America)
One New York Plaza
New York, NY 10292
PAINEWEBBER INCORPORATED (a wholly-owned subsidiary of PaineWebber Group Inc.)
1285 Avenue of the Americas,
New York, NY 10019

Each Sponsor is a Delaware corporation and it, or its predecessor, has acted as
sponsor to many unit investment trusts. As a registered broker-dealer each
Sponsor buys and sells securities (including investment company shares) for
others (including investment companies) and participates as an underwriter in
various selling groups.

TRUSTEE

The Chase Manhattan Bank, Unit Investment Trust Department, 4 New York
Plaza--6th Floor, New York, New York 10004, is the Trustee.

The Bank of New York, 101 Barclay Street,
17 W, New York, New York 10268, is the Trustee.

It is supervised by the Federal Deposit Insurance Corporation, the Board of
Governors of the Federal Reserve System and New York State banking authorities.

UNDERWRITERS' AND SPONSORS' PROFITS

Underwriters receive sales charges when they sell units. The Sponsors also
realized a profit or loss on the initial deposit of the bonds. Any cash made
available by you to the Sponsors before the settlement date for those units may
be used in the Sponsors' businesses to the extent permitted by federal law and
may benefit the Sponsors.

A Sponsor or Underwriter may realize profits or sustain losses on bonds in the
Fund which were acquired from underwriting syndicates of which it was a member.

In maintaining a secondary market, the Sponsors will also realize profits or
sustain losses in the amount of any difference between the prices at which they
buy units and the prices at which they resell or redeem them.

PUBLIC DISTRIBUTION

The Sponsors do not intend to qualify units for sale in any foreign countries.
This prospectus does not constitute an offer to sell units in any country where
units cannot lawfully be sold.

                                       13
<PAGE>
CODE OF ETHICS

Merrill Lynch, as agent for the Sponsors, has adopted a code of ethics requiring
preclearance and reporting of personal securities transactions by its employees
with access to information on portfolio transactions. The goal of the code is to
prevent fraud, deception or misconduct against the Fund and to provide
reasonable standards of conduct.

YEAR 2000 ISSUES

Many computer systems were designed in such a way that they may be unable to
distinguish between the year 2000 and the year 1900 (commonly known as the "Year
2000 Problem"). We do not expect that the computer system changes necessary to
prepare for the Year 2000 will cause any major operational difficulties for the
Fund. The Year 2000 Problem may adversely affect the issuers of the bonds
contained in the Portfolio, but we cannot predict whether any impact will be
material to the Fund as a whole.

TAXES

The following summary describes some of the important income tax consequences of
holding units. It assumes that you are not a dealer, financial institution,
insurance company or other investor with special circumstances or subject to
special rules. You should consult your own tax adviser about your particular
circumstances.

At the date of issue of each bond, counsel for the issuer delivered an opinion
to the effect that interest on the bond is exempt from regular federal income
tax. However, interest may be subject to state and local taxes and may be taken
into account in determining your preference items for alternative minimum tax
purposes. Neither we nor our counsel have reviewed the issuance of the bonds,
related proceedings or the basis for the opinions of counsel for the issuers. We
cannot assure you that the issuer (or other users) have complied or will comply
with any requirements necessary for a bond to be tax-exempt. If any of the bonds
were determined not to be tax-exempt, you could be required to pay income tax
for current and prior years, and if the Fund were to sell the bond, it might
have to sell it at a substantial discount.

In the opinion of our counsel, under existing law:

GENERAL TREATMENT OF THE FUND AND YOUR INVESTMENT

The Fund will not be taxed as a corporation for federal income tax purposes, and
you will be considered to own directly your share of each bond in the Fund.

GAIN OR LOSS UPON DISPOSITION

When all or part of your share of a bond is disposed of (for example, when the
Fund sells, exchanges or redeems a bond or when you sell or exchange your
units), you will generally recognize capital gain or loss. Your gain, however,
will generally be ordinary income to the extent of any accrued "market
discount". Generally you will have market discount to the extent that your basis
in a bond when you purchase a unit is less than its stated redemption price at
maturity (or, if it is an original issue discount bond, the issue price
increased by original issue discount that has accrued on the bond before your
purchase). You should consult your tax adviser in this regard.

If your net long-term capital gains exceed your net short-term capital losses,
the excess

                                       14
<PAGE>
may be subject to tax at a lower rate than ordinary income. Any capital gain
from the Fund will be long-term if you are considered to have held your
investment on each bond for more than one year and short-term otherwise. If you
are an individual and sell your units after holding them for more than one year,
you may be entitled to a 20% maximum federal tax rate on any resulting gains.
Because the deductibility of capital losses is subject to limitations, you may
not be able to deduct all of your capital losses. Consult your tax adviser in
this regard.

YOUR BASIS IN THE BONDS

Your aggregate basis in the bonds will be equal to the cost of your units,
including any sales charges and the organizational expenses you pay, adjusted to
reflect any accruals of "original issue discount," "acquisition premium" and
"bond premium". You should consult your tax adviser in this regard.

EXPENSES

If you are not a corporate investor, you will not be entitled to a deduction for
your share of fees and expenses of the Fund. Also, if you borrowed money in
order to purchase or carry your units, you will not be able to deduct the
interest on this borrowing for federal income tax purposes. The IRS may treat
your purchase of units as made with borrowed money even if the money is not
directly traceable to the purchase of units.

STATE AND LOCAL TAXES

Under the income tax laws of the State and City of New York, the Fund will not
be taxed as a corporation. If you are a New York taxpayer, your income from the
Fund will not be tax-exempt in New York except to the extent that the income is
earned on bonds that are tax-exempt for New York purposes. Depending on where
you live, your income from the Fund may be subject to state and local taxation.
You should consult your tax adviser in this regard.

SUPPLEMENTAL INFORMATION

You can receive at no cost supplemental information about the Fund by calling
the Trustee. The supplemental information includes more detailed risk disclosure
about the types of bonds that may be in the Fund's portfolio, general risk
disclosure concerning any insurance securing certain bonds, and general
information about the structure and operation of the Fund. The supplemental
information is also available from the SEC.

                                       15
<PAGE>

          MUNICIPAL INVESTMENT TRUST FUND,
          INVESTMENT GRADE PORTFOLIO (BBB QUALITY OR BETTER),
          LONG INTERMEDIATE TERM SERIES,
          DEFINED ASSET FUNDS

          REPORT OF INDEPENDENT ACCOUNTANTS

          The Sponsors, Trustee and Holders
          of Municipal Investment Trust Fund,
          Investment Grade Portfolio (BBB Quality or Better), Long Intermediate
          Term Series, Defined Asset Funds:

          We have audited the accompanying statement of condition of Municipal
          Investment Trust Fund, Investment Grade Portfolio (BBB Quality or
          Better), Long Intermediate Term Series, Defined Asset Funds, including
          the portfolio, as of October 31, 1999 and the related statements of
          operations and of changes in net assets for the period August 1, 1999
          to October 31, 1999 and the years ended July 31, 1999, 1998 and 1997.
          These financial statements are the responsibility of the Trustee. Our
          responsibility is to express an opinion on these financial statements
          based on our audits.

          We conducted our audits 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. Securities owned at October 31, 1999, as shown
          in such portfolio, were confirmed to us by The Chase Manhattan Bank,
          the Trustee. An audit also includes assessing the accounting
          principles used and significant estimates made by the Trustee, as well
          as evaluating the overall financial statement presentation. We believe
          that our audits provide 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 Municipal
          Investment Trust Fund, Investment Grade Portfolio (BBB Quality or
          Better), Long Intermediate Term Series, Defined Asset Funds at October
          31, 1999 and the results of its operations and changes in its net
          assets for the above-stated periods in conformity with generally
          accepted accounting principles.


          DELOITTE & TOUCHE LLP

          New York, N.Y.
          January 26, 2000


                                     D - 1.
<PAGE>

     MUNICIPAL INVESTMENT TRUST FUND,
     INVESTMENT GRADE PORTFOLIO (BBB QUALITY OR BETTER),
     LONG INTERMEDIATE TERM SERIES,
     DEFINED ASSET FUNDS


     STATEMENT OF CONDITION
     As of October 31, 1999

<TABLE>
<S>                                                 <C>             <C>
TRUST PROPERTY:
  Investment in marketable securities -
     at value (cost $ 11,966,143 )(Note 1)........                  $12,502,469
  Accrued interest ...............................                      209,945
  Prepaid Trustee's fees .........................                        6,833
  Cash - principal ...............................                      196,752
  Deferred organization costs (Note 5) ...........                        2,606
                                                                    -----------
    Total trust property .........................                   12,918,605


LESS LIABILITIES:
  Income advance from Trustee.....................  $   169,646
  Accrued Sponsors' fees .........................        1,512
  Accrued Surveillance fees ......................        1,823
  Other liabilities (Note 5) .....................        2,606         175,587
                                                    -----------     -----------


NET ASSETS, REPRESENTED BY:
  12,361 units of fractional undivided
     interest outstanding (Note 3)................   12,699,221

  Undistributed net investment income ............       43,797     $12,743,018
                                                    -----------     ===========

UNIT VALUE ($ 12,743,018 / 12,361 units ).........                  $  1,030.91
                                                                    ===========
</TABLE>

                       See Notes to Financial Statements.


                                     D - 2.
<PAGE>

     MUNICIPAL INVESTMENT TRUST FUND,
     INVESTMENT GRADE PORTFOLIO (BBB QUALITY OR BETTER),
     LONG INTERMEDIATE TERM SERIES,
     DEFINED ASSET FUNDS


     STATEMENTS OF OPERATIONS

<TABLE>
<CAPTION>
                                              August 1, 1999
                                                     to
                                                 October 31,                   Years Ended July 31,
                                                    1999           1999              1998               1997
                                                    ----           ----              ----               ----

<S>                                                            <C>               <C>               <C>
INVESTMENT INCOME:
  Interest income ........................      $   196,548    $   837,740       $   940,705       $   980,933
  Trustee's fees and expenses ............           (4,055)       (16,340)          (18,200)          (18,580)
  Surveillance fees ......................           (2,506)        (9,892)          (12,809)          (14,970)
  Sponsors' fees .........................             (637)        (1,452)           (1,528)             (433)
                                                ---------------------------------------------------------------
  Net investment income ..................          189,350        810,056           908,168           946,950
                                                ---------------------------------------------------------------


REALIZED AND UNREALIZED GAIN (LOSS)
  ON INVESTMENTS:
  Realized gain on
    securities sold or redeemed ..........           15,116        150,510           104,151            14,075
  Unrealized appreciation (depreciation)
    of investments .......................         (275,667)      (439,255)          206,767           826,490
                                                ---------------------------------------------------------------
  Net realized and unrealized
     gain (loss ) on investments .........         (260,551)      (288,745)          310,918           840,565
                                                ---------------------------------------------------------------


NET INCREASE (DECREASE) IN NET ASSETS
  RESULTING FROM OPERATIONS ..............      $   (71,201)   $   521,311       $ 1,219,086       $ 1,787,515
                                                ===============================================================
</TABLE>

                       See Notes to Financial Statements.


                                     D - 3.
<PAGE>

     MUNICIPAL INVESTMENT TRUST FUND,
     INVESTMENT GRADE PORTFOLIO (BBB QUALITY OR BETTER),
     LONG INTERMEDIATE TERM SERIES,
     DEFINED ASSET FUNDS

     STATEMENTS OF CHANGES IN NET ASSETS

<TABLE>
<CAPTION>
                                               August 1, 1999
                                                      to
                                                  October 31,                Years Ended July 31,
                                                     1999          1999              1998              1997
                                                     ----          ----              ----              ----

<S>                                                            <C>               <C>               <C>
OPERATIONS:
  Net investment income ..................      $   189,350    $   810,056       $   908,168       $   946,950
  Realized gain on
    securities sold or redeemed ..........           15,116        150,510           104,151            14,075
  Unrealized appreciation (depreciation)
    of investments .......................         (275,667)      (439,255)          206,767           826,490
                                                ---------------------------------------------------------------
  Net increase (decrease) in net assets
    resulting from operations ............          (71,201)       521,311         1,219,086         1,787,515
                                                ---------------------------------------------------------------
DISTRIBUTIONS TO HOLDERS (Note 2):
  Income  ................................         (190,030)      (812,437)         (908,899)         (946,454)
  Principal ..............................                         (17,752)           (3,426)
                                                ---------------------------------------------------------------
  Total distributions ....................         (190,030)      (830,189)         (912,325)         (946,454)
                                                ---------------------------------------------------------------
SHARE TRANSACTIONS:
  Redemption amounts - income ............           (1,880)        (3,142)           (2,388)             (396)
  Redemption amounts - principal .........         (700,082)    (1,869,602)       (1,031,066)         (209,021)
                                                ---------------------------------------------------------------
  Total share transactions ...............         (701,962)    (1,872,744)       (1,033,454)         (209,417)
                                                ---------------------------------------------------------------

NET INCREASE (DECREASE) IN NET ASSETS ....         (963,193)    (2,181,622)         (726,693)          631,644

NET ASSETS AT BEGINNING OF PERIOD ........       13,706,211     15,887,833        16,614,526        15,982,882
                                                ---------------------------------------------------------------
NET ASSETS AT END OF PERIOD ..............      $12,743,018    $13,706,211       $15,887,833       $16,614,526
                                                ===============================================================
PER UNIT:
  Income distributions during
    period ...............................      $     14.87    $     61.12       $     59.44       $     59.35
                                                ===============================================================
  Principal distributions during
    period ...............................                     $      1.29       $      0.22
                                                               =============================
  Net asset value at end of
    period ...............................      $  1,030.91    $  1,051.41       $  1,075.39       $  1,055.16
                                                ===============================================================
TRUST UNITS:
  Redeemed during period .................              675          1,738               972               201
  Outstanding at end of period ...........           12,361         13,036            14,774            15,746
                                                ===============================================================
</TABLE>

                       See Notes to Financial Statements.


                                     D - 4.
<PAGE>

          MUNICIPAL INVESTMENT TRUST FUND,
          INVESTMENT GRADE PORTFOLIO (BBB QUALITY OR BETTER),
          LONG INTERMEDIATE TERM SERIES,
          DEFINED ASSET FUNDS

          NOTES TO FINANCIAL STATEMENTS

     1.   SIGNIFICANT ACCOUNTING POLICIES

          The Fund is registered under the Investment Company Act of 1940 as a
          Unit Investment Trust. The following is a summary of significant
          accounting policies consistently followed by the Fund in the
          preparation of its financial statements. The policies are in
          conformity with generally accepted accounting principles.

           (A)      Securities are stated at value as determined by the
                    Evaluator based on bid side evaluations for the securities.

           (B)      The Fund is not subject to income taxes. Accordingly, no
                    provision for such taxes is required.

           (C)      Interest income is recorded as earned.

     2.   DISTRIBUTIONS

          A distribution of net investment income is made to Holders each month.
          Receipts other than interest, after deductions for redemptions and
          applicable expenses, are also distributed periodically.

     3.   NET CAPITAL

     Cost of 12,361 units at Date of Deposit ..................  $12,679,268
     Less sales charge ........................................      501,980
                                                                 -----------
     Net amount applicable to Holders .........................   12,177,288
     Redemptions of units - net cost of 2,413 units redeemed
       less redemption amounts (principal).....................     (277,067)
     Realized gain on securities sold or redeemed .............      283,852
     Principal distributions ..................................      (21,178)
     Net unrealized appreciation of investments ...............      536,326
                                                                 -----------

     Net capital applicable to Holders ........................  $12,699,221
                                                                 ===========

     4.   INCOME TAXES

          As of October 31, 1999, net unrealized appreciation of investments,
          based on cost for Federal income tax purposes, aggregated $536,326, of
          which $ 543,046 related to appreciated securities and $ 6,720 related
          to depreciated securities. The cost of investment securities for
          Federal income tax purposes was $11,966,143 at October 31, 1999.


     5.   DEFERRED ORGANIZATION COSTS

          Deferred organization costs are being amortized over a period of five
          years. Included in "Other liabilities" in the accompanying Statement
          of Condition is $ 2,606 payable to the Trustee for reimbursement of
          costs related to the organization of the Trust.


                                     D - 5.
<PAGE>

     MUNICIPAL INVESTMENT TRUST FUND,
     INVESTMENT GRADE PORTFOLIO (BBB QUALITY OR BETTER),
     LONG INTERMEDIATE TERM SERIES,
     DEFINED ASSET FUNDS

     PORTFOLIO
     As of October 31, 1999

<TABLE>
<CAPTION>
                                             Rating of Issues(1)
                                             --------------------
                                             Standard
                                             & Poor's   Moody's    Fitch
     Portfolio No. and Title of              Corpora-   Investors  Investors       Face
            Securities                       tion       Service    Group          Amount        Coupon      Maturities(3)
            ----------                       ---------  ---------  ---------    -----------   ----------    ------------
<S>                                          <C>          <C>      <C>          <C>              <C>           <C>
   1 Pomona, CA, Pub. Fin. Auth., 1993 Rfdg.    A-         A3        O          $  255,000       5.500 %       2008(5)
     Rev. Bonds, Ser. L (Southwest Pomona
     Redev. Proj.)
                                                                                   995,000       5.500         2008


   2 Lemoore, CA, Redev. Agy., Lemoore          NR         Baa2      O             170,000       6.000         2005
     Redev. Proj., Tax Alloc. Rfdg. Bonds,
     Issue of 1995
                                                                                   180,000       6.100         2006


                                                                                   190,000       6.200         2007


                                                                                   205,000       6.300         2008


                                                                                   220,000       6.400         2009


                                                                                   230,000       6.500         2010




   3 City of Fort Wayne, IN, Redev. Dist.       NR         NR        O           1,500,000       6.750         2010(5)
     Tax Increment Rev. Bonds of 1995 (Civic
     Ctr. Urban Renewal Area Proj.)

   4 Massachusetts State Hlth. and Educl.       NR         A3        O           1,030,000       5.900         2008
     Fac. Auth., Rev. Bonds (Addison-
     Gilbert Hosp.), Ser. C

   5 The Ind. Dev. Auth. of the City of         NR         NR        A-
     Lee's Summit, MO, Hlth. Fac. Rev. Bonds                                       315,000       6.550         2010
     (John Knox Vill. Proj.), Ser. 1995

<CAPTION>
                                                Optional
     Portfolio No. and Title of                Redemption
            Securities                        Provisions(3)     Cost       Value(2)
            ----------                        -------------   ----------  ----------
<S>                                            <C>           <C>         <C>
   1 Pomona, CA, Pub. Fin. Auth., 1993 Rfdg.   02/01/04      $  236,541  $  269,385
     Rev. Bonds, Ser. L (Southwest Pomona      @  102.000
     Redev. Proj.)
                                               02/01/04         922,972   1,009,617
                                               @  102.000

   2 Lemoore, CA, Redev. Agy., Lemoore         08/01/03         169,363     173,708
     Redev. Proj., Tax Alloc. Rfdg. Bonds,     @  102.000
     Issue of 1995
                                               08/01/03         179,282     183,913
                                               @  102.000

                                               08/01/03         189,198     194,026
                                               @  102.000

                                               08/01/03         204,092     209,110
                                               @  102.000

                                               08/01/03         218,986     224,033
                                               @  102.000

                                               08/01/03         228,901     237,077
                                               @  102.000



   3 City of Fort Wayne, IN, Redev. Dist.      02/01/05       1,516,680   1,638,690
     Tax Increment Rev. Bonds of 1995 (Civic   @  101.000
     Ctr. Urban Renewal Area Proj.)

   4 Massachusetts State Hlth. and Educl.      07/01/03         998,369   1,031,370
     Fac. Auth., Rev. Bonds (Addison-          @  102.000
     Gilbert Hosp.), Ser. C

   5 The Ind. Dev. Auth. of the City of
     Lee's Summit, MO, Hlth. Fac. Rev. Bonds   08/15/05         316,288     322,009
     (John Knox Vill. Proj.), Ser. 1995        @  102.000
</TABLE>


                                     D - 6.
<PAGE>

     MUNICIPAL INVESTMENT TRUST FUND,
     INVESTMENT GRADE PORTFOLIO (BBB QUALITY OR BETTER),
     LONG INTERMEDIATE TERM SERIES,
     DEFINED ASSET FUNDS

     PORTFOLIO
     As of October 31, 1999

<TABLE>
<CAPTION>
                                             Rating of Issues(1)
                                             --------------------
                                             Standard
                                             & Poor's   Moody's     Fitch
     Portfolio No. and Title of              Corpora-   Investors   Investors     Face
            Securities                       tion       Service     Group        Amount         Coupon      Maturities(3)
            ----------                       ---------  ---------   ---------   ----------    ----------    ------------
<S>                                          <C>          <C>      <C>          <C>              <C>           <C>
   6 Mississippi Bus. Fin. Corp., Ind. Dev.     NR         NR         O        $1,500,000        6.900 %       2010
     Rev. Bonds (T,T & W Farm Products,
     Inc., Proj.), Ser. 1995 (Deposit
     Guaranty National Bank, Jackson, MS
     - Letter of Credit) (AMT) (4) (6)

   7 North Carolina Eastern Mun. Pwr. Agy.,     BBB        Baa3       BBB+        950,000        6.000         2005
     Rfdg. Ser. 1993 B

   8 The City of New York, NY, G.O. Bonds,      A-         A3         A           635,000        6.000         2005
     Ser. 1994 A

   9 New York State Urban Dev. Corp., Corr.     BBB+       Baa1       A           980,000        5.400         2006
     Fac. Rev. Bonds, Rfdg. Ser. A

  10 City of Leander, Williamson Cnty., TX,     NR         NR         O           780,000        6.500         2010(5)
     G.O. Bonds, Ser. 1995

                                                                                  220,000        6.500         2010


  11 South Plains Regl. Hsg. Auth., TX,         NR         NR         BBB         500,000        6.900         2009
     Multi-Family Mtge. Rev. Bonds, Ser.
     1995 A (Sec. 8 Asstd. Proj.)

  12 Tooele Cnty., UT, Hazardous Waste Disp.    BBB        NR         O         1,250,000        6.750         2010
     Rev. Bonds (Laidlaw Inc./U.S.P.C. Clive
     Proj.), Ser. 1995 (Guarantee-Laidlaw
     Inc.) (AMT) (4)

                                                                               ----------
     TOTAL                                                                    $12,105,000
                                                                               ==========


<CAPTION>
                                                 Optional
     Portfolio No. and Title of                 Redemption
            Securities                         Provisions(3)     Cost        Value(2)
            ----------                         ------------    ----------   ----------
<S>                                            <C>            <C>          <C>
   6 Mississippi Bus. Fin. Corp., Ind. Dev.    07/01/03       $ 1,528,485  $ 1,521,765
     Rev. Bonds (T,T & W Farm Products,        @  103.000
     Inc., Proj.), Ser. 1995 (Deposit
     Guaranty National Bank, Jackson, MS
     - Letter of Credit) (AMT) (4) (6)

   7 North Carolina Eastern Mun. Pwr. Agy.,    01/01/03           946,552      959,985
     Rfdg. Ser. 1993 B                         @  102.000

   8 The City of New York, NY, G.O. Bonds,     08/01/04           632,619      666,363
     Ser. 1994 A                               @  101.500

   9 New York State Urban Dev. Corp., Corr.    None               935,057      994,288
     Fac. Rev. Bonds, Rfdg. Ser. A

  10 City of Leander, Williamson Cnty., TX,    08/15/05           772,629      853,484
     G.O. Bonds, Ser. 1995                     @  101.000

                                               08/15/05           217,921      233,273
                                               @  101.000

  11 South Plains Regl. Hsg. Auth., TX,        08/01/05           508,095      509,835
     Multi-Family Mtge. Rev. Bonds, Ser.       @  102.000
     1995 A (Sec. 8 Asstd. Proj.)

  12 Tooele Cnty., UT, Hazardous Waste Disp.   08/01/05         1,244,113    1,270,538
     Rev. Bonds (Laidlaw Inc./U.S.P.C. Clive   @  102.000
     Proj.), Ser. 1995 (Guarantee-Laidlaw
     Inc.) (AMT) (4)

                                                               ----------   ----------
     TOTAL                                                    $11,966,143  $12,502,469
                                                               ==========   ==========
</TABLE>

                             See Notes to Portfolio.


                                     D - 7.
<PAGE>

     MUNICIPAL INVESTMENT TRUST FUND,
     INVESTMENT GRADE PORTFOLIO (BBB QUALITY OR BETTER),
     LONG INTERMEDIATE TERM SERIES,
     DEFINED ASSET FUNDS

     NOTES TO PORTFOLIO
     As of October 31, 1999

    (1)   The ratings are of the bonds themselves by Standard & Poor's Ratings
          Group, or by Moody's Investors Service, Inc., or by Fitch Investors
          Service, Inc.; "(a)" indicates that it is a rating of the outstanding
          debt obligations of the institution providing a letter of credit or
          guarantee. "O" indicates Fitch previously delivered an opinion that
          the issue had investment grade characteristics (however, Fitch has not
          re-evaluated the bond since the initial date of deposit). "NR"
          indicates that Standard & Poor's or Moody's has not rated the bond.
          Bond ratings have been furnished by the Evaluator but not confirmed
          with the rating agencies.

    (2)   See Notes to Financial Statements.

    (3)   Optional redemption provisions, which may be exercised in whole or in
          part, are initially at prices of par plus a premium, then subsequently
          at prices declining to par. Certain securities may provide for
          redemption at par prior or in addition to any optional or mandatory
          redemption dates or maturity, for example, through the operation of a
          maintenance and replacement fund, if proceeds are not able to be used
          as contemplated, the project is condemned or sold or the project is
          destroyed and insurance proceeds are used to redeem the securities.
          Many of the securities are also subject to mandatory sinking fund
          redemption commencing on dates which may be prior to the date on which
          securities may be optionally redeemed. Sinking fund redemptions are at
          par and redeem only part of the issue. Some of the securities have
          mandatory sinking funds which contain optional provisions permitting
          the issuer to increase the principal amount of securities called on a
          mandatory redemption date. The sinking fund redemptions with optional
          provisions may, and optional refunding redemptions generally will,
          occur at times when the redeemed securities have an offering side
          evaluation which represents a premium over par. To the extent that the
          securities were acquired at a price higher than the redemption price,
          this will represent a loss of capital when compared with the Public
          Offering Price of the Units when acquired. Distributions will
          generally be reduced by the amount of the income which would otherwise
          have been paid with respect to redeemed securities and there will be
          distributed to Holders any principal amount and premium received on
          such redemption after satisfying any redemption requests for Units
          received by the Fund. The estimated current return may be affected by
          redemptions.

    (4)   Securities that are tax preference items for purposes of the
          Alternative Minimum Tax are indicated by "(AMT)".

    (5)   Bonds with an aggregate face amount of $ 2,535,000 have been
          pre-refunded and are expected to be called for redemption on the
          optional redemption provision dates shown.

    (6)   Certain bonds are covered by letters of credit which may expire prior
          to the maturity dates of the bonds. Upon expiration of a letter of
          credit, the issuer of the bond is obligated to obtain a replacement
          letter of credit or call the bond.


                                     D - 8.


<PAGE>

DEFINED ASSET FUNDS--REGISTERED TRADEMARK--

<TABLE>
<S>                                      <C>
HAVE QUESTIONS ?                         MUNICIPAL INVESTMENT TRUST FUND
Request the most recent free             INVESTMENT GRADE PORTFOLIO
Information Supplement                   (BBB QUALITY OR BETTER)
that gives more details about            (A Unit Investment Trust)
the Fund, by calling:                    ---------------------------------------
The Chase Manhattan Bank                 This Prospectus does not contain
1-800-323-1508                           complete information about the
                                         investment company filed with the
                                         Securities and Exchange Commission in
                                         Washington, D.C. under the:
                                         - Securities Act of 1933 (file no.
                                         333-57547) and
                                         - Investment Company Act of 1940 (file
                                         no. 811-1777).
                                         TO OBTAIN COPIES AT PRESCRIBED RATES--
                                         WRITE: Public Reference Section of the
                                         Commission
                                         450 Fifth Street, N.W., Washington,
                                         D.C. 20549-6009
                                         CALL: 1-800-SEC-0330.
                                         VISIT: http://www.sec.gov.
                                         ---------------------------------------
                                         No person is authorized to give any
                                         information or representations about
                                         this Fund not contained in this
                                         Prospectus or the Information
                                         Supplement, and you should not rely on
                                         any other information.
                                         ---------------------------------------
                                         When units of this Fund are no longer
                                         available, this Prospectus may be used
                                         as a preliminary prospectus for a
                                         future series, but some of the
                                         information in this Prospectus will be
                                         changed for that series.
                                         UNITS OF ANY FUTURE SERIES MAY NOT BE
                                         SOLD NOR MAY OFFERS TO BUY BE ACCEPTED
                                         UNTIL THAT SERIES HAS BECOME EFFECTIVE
                                         WITH THE SECURITIES AND EXCHANGE
                                         COMMISSION. NO UNITS CAN BE SOLD IN ANY
                                         STATE WHERE A SALE WOULD BE ILLEGAL.
                                                                     15138--2/00
</TABLE>
<PAGE>
                        MUNICIPAL INVESTMENT TRUST FUND
                           INVESTMENT GRADE PORTFOLIO
                         LONG-INTERMEDIATE TERM SERIES
                              DEFINED ASSET FUNDS
                       CONTENTS OF REGISTRATION STATEMENT

    This Post-Effective Amendment to the Registration Statement on Form S-6
comprises the following papers and documents:

    The facing sheet of Form S-6.

    The cross-reference sheet (incorporated by reference to the Cross-Reference
Sheet to the Registration Statement of Defined Asset Funds Municipal Insured
Series, 1933 Act File No. 33-54565).

    The Prospectus.

    The Signatures.

The following exhibits:

    1.1.1-- Form of Standard Terms and Conditions of Trust Effective as of
           October 21, 1993 (incorporated by reference to Exhibit 1.1.1 to the
           Registration Statement of Municipal Investment Trust Fund,
           Multi-state Series--48, 1933 Act File No. 33-50247).

    4.1 --Consent of the Evaluator.

    5.1 --Consent of independent accountants.

    9.1 -- Information Supplement (incorporated by reference to Exhibit 9.1 to
          Amendment No. 1 to the Registration Statement of Municipal Investment
          Trust Fund, Multistate Series--409, 1933 Act File No. 333-81777).

                                      R-1
<PAGE>
                        MUNICIPAL INVESTMENT TRUST FUND
                           INVESTMENT GRADE PORTFOLIO
                         LONG-INTERMEDIATE TERM SERIES
                              DEFINED ASSET FUNDS

                                   SIGNATURES

    PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT OF 1933, THE REGISTRANT,
MUNICIPAL INVESTMENT TRUST FUND, INVESTMENT GRADE PORTFOLIO, LONG-INTERMEDIATE
TERM SERIES, DEFINED ASSET FUNDS, CERTIFIES THAT IT MEETS ALL OF THE
REQUIREMENTS FOR EFFECTIVENESS OF THIS REGISTRATION STATEMENT PURSUANT TO RULE
485(B) UNDER THE SECURITIES ACT OF 1933 AND HAS DULY CAUSED THIS REGISTRATION
STATEMENT OR AMENDMENT TO THE REGISTRATION STATEMENT TO BE SIGNED ON ITS BEHALF
BY THE UNDERSIGNED THEREUNTO DULY AUTHORIZED IN THE CITY OF NEW YORK AND STATE
OF NEW YORK ON THE 16TH DAY OF FEBRUARY, 2000.

             SIGNATURES APPEAR ON PAGES R-3, R-4, R-5, R-6 AND R-7.

    A majority of the members of the Board of Directors of Merrill Lynch,
Pierce, Fenner & Smith Incorporated has signed this Registration Statement or
Amendment to the Registration Statement pursuant to Powers of Attorney
authorizing the person signing this Registration Statement or Amendment to the
Registration Statement to do so on behalf of such members.

    A majority of the members of the Board of Directors of Salomon Smith Barney
Inc. has signed this Registration Statement or Amendment to the Registration
Statement pursuant to Powers of Attorney authorizing the person signing this
Registration Statement or Amendment to the Registration Statement to do so on
behalf of such members.

    A majority of the members of the Board of Directors of Prudential Securities
Incorporated has signed this Registration Statement or Amendment to the
Registration Statement pursuant to Powers of Attorney authorizing the person
signing this Registration Statement or Amendment to the Registration Statement
to do so on behalf of such members.

    A majority of the members of the Executive Committee of the Board of
Directors of PaineWebber Incorporated has signed this Registration Statement or
Amendment to the Registration Statement pursuant to Powers of Attorney
authorizing the person signing this Registration Statement or Amendment to the
Registration Statement to do so on behalf of such members.

    A majority of the members of the Board of Directors of Dean Witter Reynolds
Inc. has signed this Registration Statement or Amendment to the Registration
Statement pursuant to Powers of Attorney authorizing the person signing this
Registration Statement or Amendment to the Registration Statement to do so on
behalf of such members.

                                      R-2
<PAGE>
               MERRILL LYNCH, PIERCE, FENNER & SMITH INCORPORATED
                                   DEPOSITOR

<TABLE>
<S>                                       <C>
By the following persons, who constitute  Powers of Attorney have been filed
  a majority of                             under
  the Board of Directors of Merrill         Form SE and the following 1933 Act
  Lynch, Pierce,                            File
  Fenner & Smith Incorporated:              NumberNumber: 333-70593
</TABLE>

     GEORGE A. SCHIEREN
     JOHN L. STEFFENS
     By J. DAVID MEGLEN
       (As authorized signatory for Merrill Lynch, Pierce,
       Fenner & Smith Incorporated and
       Attorney-in-fact for the persons listed above)

                                      R-3
<PAGE>
                           SALOMON SMITH BARNEY INC.
                                   DEPOSITOR

<TABLE>
<S>                                                           <C>
By the following persons, who constitute a majority of        Powers of Attorney
  the Board of Directors of Salomon Smith Barney Inc.:          have been filed
                                                                under the 1933 Act
                                                                File Numbers:
                                                                333-63417 and
                                                                333-63033
</TABLE>

     MICHAEL A. CARPENTER
     DERYCK C. MAUGHAN

     By GINA LEMON
       (As authorized signatory for
       Salomon Smith Barney Inc. and
       Attorney-in-fact for the persons listed above)

                                      R-4
<PAGE>
                       PRUDENTIAL SECURITIES INCORPORATED
                                   DEPOSITOR

<TABLE>
<S>                                                                     <C>
By the following persons, who constitute a majority of                  Powers of Attorney
  the Board of Directors of Prudential Securities                         have been filed
  Incorporated:                                                           under Form SE and
                                                                          the following 1933
                                                                          Act File Numbers:
                                                                          33-41631 and
                                                                          333-15919
</TABLE>

     ROBERT C. GOLDEN
     ALAN D. HOGAN
     A. LAURENCE NORTON, JR.
     LELAND B. PATON
     VINCENT T. PICA II
     MARTIN PFINSGRAFF
     HARDWICK SIMMONS
     LEE B. SPENCER, JR.
     BRIAN M. STORMS

     By RICHARD R. HOFFMANN
       (As authorized signatory for Prudential Securities
       Incorporated and Attorney-in-fact for the persons
       listed above)

                                      R-5
<PAGE>
                            PAINEWEBBER INCORPORATED
                                   DEPOSITOR

<TABLE>
<S>                                       <C>
By the following persons, who constitute  Powers of Attorney have been filed
  the Board of Directors of PaineWebber     under
  Incorporated:                             the following 1933 Act File
                                            Number: 33-55073
</TABLE>

     MARGO N. ALEXANDER
     TERRY L. ATKINSON
     BRIAN M. BAREFOOT
     STEVEN P. BAUM
     MICHAEL CULP
     REGINA A. DOLAN
     JOSEPH J. GRANO, JR.
     EDWARD M. KERSCHNER
     JAMES P. MacGILVRAY
     DONALD B. MARRON
     ROBERT H. SILVER
     MARK B. SUTTON
     By ROBERT E. HOLLEY
       (As authorized signatory for
       PaineWebber Incorporated
       and Attorney-in-fact for the persons listed above)

                                      R-6
<PAGE>
                           DEAN WITTER REYNOLDS INC.
                                   DEPOSITOR

<TABLE>
<S>                                       <C>
By the following persons, who constitute  Powers of Attorney have been filed
  a majority of                             under Form SE and the following 1933
  the Board of Directors of Dean Witter     Act File Numbers: 33-17085,
  Reynolds Inc.:                            333-13039, 333-47553 and 333-89045
</TABLE>

     BRUCE F. ALONSO
     RICHARD M. DeMARTINI
     RAYMOND J. DROP
     JAMES F. HIGGINS
     JOHN J. MACK
     MITCHELL M. MERIN
     STEPHEN R. MILLER
     PHILIP J. PURCELL
     JOHN H. SCHAEFER
     THOMAS C. SCHNEIDER
     ALAN A. SCHRODER
     ROBERT G. SCOTT
     By MICHAEL D. BROWNE
       (As authorized signatory for
       Dean Witter Reynolds Inc.
       and Attorney-in-fact for the persons listed above)


                                      R-7



                                                                     EXHIBIT 4.1

                               STANDARD & POOR'S
                    A DIVISION OF THE McGRAW-HILL COMPANIES
                                  J. J. KENNY
                                  65 BROADWAY
                           NEW YORK, N.Y. 10006-2551
                            TELEPHONE (212) 770-4422
                                FAX 212/797-8681

                                                      Febraury 16, 2000

Frank A. Ciccotto, Jr
Vice President
Tax-Exempt Evaluations

<TABLE>
<S>                                       <C>
Merrill Lynch, Pierce, Fenner & Smith
Incorporated
Defined Asset Funds
P.O. Box 9051
Princeton, New Jersey 08543-9051

The Chase Manhattan Bank
4 New York Plaza--6th Floor
New York, New York 10004
</TABLE>

RE: MUNICIPAL INVESTMENT TRUST FUND, INVESTMENT GRADE PORTFOLIO,
    DEFINED ASSET FUNDS

Gentlemen:

    We have examined the post-effective Amendment to the Registration Statement
File No. 33-57547 for the above-captioned trust. We hereby acknowledge that
Kenny S&P Evaluation Services, a division of J. J. Kenny Co., Inc. is currently
acting as the evaluator for the trust. We hereby consent to the use in the
Amendment of the reference to Kenny S&P Evaluation Services, a division of J. J.
Kenny Co., Inc. as evaluator.

    In addition, we hereby confirm that the ratings indicated in the
above-referenced Amendment to the Registration Statement for the respective
bonds comprising the trust portfolio are the ratings currently indicated in our
KENNYBASE database.

    You are hereby authorized to file copies of this letter with the Securities
and Exchange Commission.

                                                      Sincerely,
                                                      FRANK A. CICCOTTO
                                                      Vice President



                                                                     Exhibit 5.1
                       CONSENT OF INDEPENDENT ACCOUNTANTS

The Sponsors and Trustee of
Municipal Investment Trust Fund, Investment Grade Portfolio, (BBB Quality or
Better), Long-Intermediate Term Series, Defined Asset Funds

We consent to the use in this Post-Effective Amendment No. 4 to Registration
Statement No. 33-57547 of our opinion dated January 26, 2000 appearing in the
Prospectus, which is part of such Registration Statement, and to the reference
to us under the heading 'Auditors' in such Prospectus.

DELOITTE & TOUCHE LLP
New York, N.Y.
February 16, 2000



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