NUVEEN TAX EXEMPT UNIT TRUST SERIES 718
497, 1994-03-08
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<PAGE>
NUVEEN  Tax-Exempt Unit Trusts
     NUVEEN
      NORTH CAROLINA
     TRUST 273
              (NORTH CAROLINA TRADITIONAL TRUST 273)
 
            Estimated Current Return
            5.20% to 5.35%
            as of 03/03/94
 
            Estimated Long Term Return
            5.28% to 5.44%
             35,000 units in a
             diversified $3,500,000
             portfolio of tax-exempt
             bonds
                  Cusip:
                  670958 677 Monthly Payment Option
                  670958 685 Quarterly Payment Option
                  670958 693 Semi-Annual Payment Option
 
                  Registered in North Carolina
                    John Nuveen & Co. Incorporated
                    Investment Bankers
 
<TABLE>
<S>                           <C>
Chicago:                      Atlanta
333 W. Wacker Dr.             Austin
Chicago, Illinois 60606       Boca Raton
Telephone: 312.917.7700       Boston
                              Columbus
New York:                     Dallas/Ft. Worth
Swiss Bank Tower              Irvine
10 East 50th Street           Philadelphia
New York, New York 10022      Phoenix
Telephone: 212.207.2000       San Francisco
                              Seattle
                              Tampa
                              Washington, D.C.
</TABLE>
 
<PAGE>
- --------------------------------------------------------------------------------
 
NUVEEN TAX-EXEMPT UNIT TRUST--NORTH CAROLINA TRADITIONAL TRUST 273
SCHEDULE OF INVESTMENTS
DATE OF DEPOSIT MARCH 4, 1994
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                                                             Ratings
                                                                                    Optional         -----------------------
  Aggregate            Name of Issuer and Title of Issue Represented               Redemption        Standard
  Principal               by Sponsor's Contracts to Purchase Bonds                 Provisions        & Poor's       Moody's
  <C>       <C> <S>                                                              <C>                 <C>           <C>
  --------------------------------------------------------------------------------------------------------------------------
  $  500,000    North Carolina Medical Care Commission, Hospital Revenue           2003 at 102          AAA           Aaa
                  Refunding Bonds (Wesley Long Community Hospital Project),
                  Series 1993, 5.25% Due 10/1/17. (AMBAC Insured.)
     500,000    North Carolina Medical Care Commission, Hospital Revenue           2002 at 102          AAA           Aaa
                  Bonds (Memorial Mission Hospital Project), Series 1992,
                  6.00% Due 10/1/22. (FSA Insured.)
     500,000    North Carolina Medical Care Commission, Hospital Revenue           2003 at 102          AA            Aa
                  Refunding Bonds (Presbyterian Health Services Corp,
                  Project), Series 1993, 5.50% Due 10/1/20.
     500,000    North Carolina Municipal Power Agency Number 1, Catawba            2003 at 100          AAA           Aaa
                  Electric Revenue Bonds, Series 1992, 5.75% Due 1/1/20.
                  (Original issue discount bonds delivered on or about
                  December 10, 1992 at a price of 92.75% of principal
                  amount.)(MBIA Insured.)
     500,000    Metropolitan Sewerage District of Buncombe County (North           2003 at 102          AAA           Aaa
                  Carolina), Sewerage System Revenue Refunding Bonds, Series
                  1993A, 5.50% Due 7/1/22. (FGIC Insured.)
     500,000    City of Charlotte, North Carolina, Refunding Certificates of       2003 at 100          AAA           Aaa
                  Participation (Convention Facility Project), Series 1993C,
                  5.00% Due 12/1/21. (Original issue discount bonds
                  delivered on or about August 25, 1993 at a price of
                  90.737% of principal amount.)(AMBAC Insured.)
     500,000    City of Fayetteville, North Carolina, Public Works                 2003 at 100          AAA           Aaa
                  Commission Revenue Refunding Bonds, Series 1993, 4.75% Due
                  3/1/14. (Original issue discount bonds delivered on or
                  about November 23, 1993 at a price of 94.037% of principal
                  amount.)(FGIC Insured.)
  ----------
  $3,500,000
  ----------
  ----------
</TABLE>
 
<PAGE>
- --------------------------------------------------------------------------------
UNIT PRICE, ESTIMATED CURRENT RETURN AND ESTIMATED LONG TERM RETURN DEPEND ON
AMOUNT PURCHASED AND PAYMENT OPTION
Sales charge/volume discount applies on all concurrent purchases of any Nuveen
trust units. Estimated Current Return equals net income divided by offering
price. Estimated Long Term Return represents an average of the yields to
maturity (or call) of the Bonds in the Trust adjusted to reflect expenses and
sales charges.
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                          Estimated Current Return (2)
                                                              -----------------------------------------------------
          AMOUNT PURCHASED                         Public
- -------------------------------------  Sales      Offering          Monthly         Quarterly       Semi-Annual
     Units              Dollars        Charge     Price (1)         Payment          Payment          Payment
- ----------------  -------------------  ------    -----------     -------------    -------------    -------------
<S>               <C>                  <C>       <C>         <C>                <C>              <C>
50-999                 $5,000-$99,999   4.90 %   $    100.46          5.20%            5.23%            5.25%
1,000-2,499           100,000-249,999   4.50          100.04          5.22             5.25             5.27
2,500-4,999           250,000-499,999   4.25           99.78          5.23             5.27             5.28
5,000-9,999           500,000-999,999   3.50           99.01          5.27             5.31             5.33
10,000 and over    1,000,000 and over   3.00           98.49          5.30             5.33             5.35
</TABLE>
 
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                         Estimated Long Term Return (3)
                                                              -----------------------------------------------------
          AMOUNT PURCHASED                         Public
- -------------------------------------  Sales      Offering          Monthly         Quarterly       Semi-Annual
     Units              Dollars        Charge     Price (1)         Payment          Payment          Payment
- ----------------  -------------------  ------    -----------     -------------    -------------    -------------
<S>               <C>                  <C>       <C>         <C>                <C>              <C>
50-999                 $5,000-$99,999   4.90 %   $    100.46          5.28%            5.32%            5.34%
1,000-2,499           100,000-249,999   4.50          100.04          5.30             5.34             5.36
2,500-4,999           250,000-499,999   4.25           99.78          5.31             5.35             5.37
5,000-9,999           500,000-999,999   3.50           99.01          5.36             5.39             5.41
10,000 and over    1,000,000 and over   3.00           98.49          5.38             5.42             5.44
</TABLE>
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
(1) As of the business day prior to the Date of Deposit. Units are offered at
    the Public Offering Price plus accrued interest.
(2) All figures as of the business day prior to Date of Deposit. The estimated
    current return for purchases made on such date will be as shown, as long as
    the portfolio size and composition remain the same.
(3) In contrast to Estimated Current Return, Estimated Long Term Return reflects
    the amortization of premium or accretion of discount, if any, on the bonds
    in the Trust's portfolio.
 
- --------------------------------------------------------------------------------
 
INTEREST DISTRIBUTIONS TO UNITHOLDERS   Unitholders may elect to have interest
distributions made on a monthly, quarterly, or semi-annual basis. Record Dates
are May 1 and November 1 for semi-annual distributions; February 1, May 1,
August 1 and November 1 for quarterly distributions; and the first of each month
for monthly distributions. Details of interest distributions per unit under the
various plans appear in the following table based upon estimated net annual
interest income at the Date of Deposit:
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                                                                       Normal
                                                                                                                   Distributions
North Carolina Traditional Trust                         1994                                  1995                  per Year +
<S>                                     <C>            <C>            <C>            <C>            <C>            <C>
- -------------------------------------------------------------------------------------------------------------      --------------
Record Date*..........................        6/1            8/1           11/1            2/1            5/1
Distribution Date.....................       6/15           8/15          11/15           2/15           5/15
- ---------------------------------------------------------------------------------------------------------------------------------
Monthly Distribution Plan.............  $   .4351(1)                                                               $  5.2218
                                                             --------    $.4351 every month    --------
Quarterly Distribution Plan...........  $   .4351(1)   $   .8756(2)   $  1.3134      $  1.3134      $  1.3134      $  5.2538
Semi-Annual Distribution Plan.........  $   .4351(1)                  $  2.1969(3)                  $  2.6363      $  5.2728
- ---------------------------------------------------------------------------------------------------------------------------------
<FN>
  * Record Dates for semi-annual distributions are May 1 and November 1; for quarterly distributions, they are February 1, May 1,
    August 1 and November 1. Record Dates for monthly distributions are the first day of each month.
(1) The first distribution will be paid to all Unitholders, regardless of the distribution plan selected.
(2) The second distribution under the quarterly distribution plan represents a 2-month distribution; subsequent quarterly
    distributions will be regular 3-month distributions.
(3) The second distribution under the semi-annual distribution plan represents a 5-month distribution; subsequent semi-annual
    distributions will be regular 6-month distributions.
</TABLE>
 
+ Interest for Unitholders of this series began to accrue as of the Date of
Deposit. Units purchased on the Date of Deposit will have $.10 of accrued
interest that will be added to the Public Offering Price on the Settlement Date.
After provision for expenses of the Fund, the daily rate of accrual from the
Date of Deposit to the first Record Date is $.01450 per unit per day.
Consequently, on the first Record Date (06/01/94), accrued interest will total
$1.2615 per unit for the 87-day period. Because a substantial portion of this
interest will not yet be due from the issuers of the bonds in the Fund, the
first payment to all Unitholders of Record on 06/01/94 is $.4351, and the
remaining $.8264 of accrued interest will remain an asset of the Trust and be
distributed in subsequent periods as portfolio bonds mature, or are redeemed, or
sold and the accrued interest on these bonds is collected. After the first
Record Date daily rates of accrual are:
              Monthly - $0.01450              Quarterly - $0.01459
                             Semi-Annual - $0.01465
This daily rate of accrual, and the annual distributions shown above, will
remain the same as long as the portfolio size and composition remain the same.
 
- --------------------------------------------------------------------------------
 
                                                          718
<PAGE>
- -------------------------------------------------------
 
AVERAGE PORTFOLIO LIFE   The average maturity of portfolio bonds is 25.8 years.
The first bond is scheduled to mature in March, 2014, with the last bond
maturity being October, 2022.
 
- -------------------------------------------------
 
QUALITY OF PORTFOLIO AS RATED BY
STANDARD & POOR'S CORPORATION
OR MOODY'S INVESTORS SERVICES
- -------------------------------------------------
 
<TABLE>
<CAPTION>
       Rating          Percent of Portfolio
      Category              Par Value
<S>                    <C>                   <C>
- -------------------------------------------------------------
AAA                         86%
AA                          14
                           ---
                           100%
</TABLE>
 
- -------------------------------------------------
 
CALL PROTECTION   Bonds are first subject to optional redemption by the issuers
in the years and at the prices shown under the Redemption Provisions column in
the Schedule of Investments. Unless otherwise stated, in subsequent years, bonds
are redeemable at declining prices, but not usually below par value. Some issues
or some portions of issues may also be subject to sinking fund redemption or
extraordinary redemption without premium prior to the dates shown.
 
- -------------------------------------------------
 
NO CHARGE FOR REDEMPTION   The Trustee, United States Trust Company of New York,
will redeem units at net asset value. In addition, John Nuveen & Co.
Incorporated intends to maintain a secondary market for this Nuveen Tax-Exempt
Unit Trust. Inasmuch as all securities investments are subject to market price
fluctuation, net asset value at the time of redemption could be more or less
than the initial investment.
 
- -------------------------------------------------
 
REINVESTMENT OPTIONS   Specify automatic reinvestment of trust income, with no
sales charge, to earn compounded dividends with Nuveen mutual funds.
 
- -------------------------------------------------
 
FOR A PROSPECTUS CONTAINING MORE COMPLETE INFORMATION, INCLUDING CHARGES AND
EXPENSES, ON THIS NUVEEN TAX-EXEMPT UNIT TRUST AND ANY OTHER NUVEEN FUND, CALL
YOUR BROKER . . . OR NUVEEN AT
 
                                 1-800-351-4100
 
READ THE PROSPECTUS CAREFULLY BEFORE YOU INVEST OR SEND MONEY.
<PAGE>
NUVEEN  Tax-Exempt Unit Trusts
     NUVEEN
     NATIONAL
     INSURED
     TRUST 265
 
            Estimated Current Return
            First
            Year: 5.44% to 5.60%
            Subsequent
            Years: 5.49% to 5.65%
            as of 03/03/94
 
            Estimated Long Term Return
            5.51% to 5.67%
             75,000 units in a
             diversified $7,500,000
             portfolio of tax-exempt
             bonds rated "AAA"
                  Cusip:
                  67101X 526 Monthly Payment Option
                  67101X 534 Quarterly Payment Option
                  67101X 542 Semi-Annual Payment Option
 
                  Registered in all states
                    John Nuveen & Co. Incorporated
                    Investment Bankers
 
<TABLE>
<S>                           <C>
Chicago:                      Atlanta
333 W. Wacker Dr.             Austin
Chicago, Illinois 60606       Boca Raton
Telephone: 312.917.7700       Boston
                              Columbus
New York:                     Dallas/Ft. Worth
Swiss Bank Tower              Irvine
10 East 50th Street           Philadelphia
New York, New York 10022      Phoenix
Telephone: 212.207.2000       San Francisco
                              Seattle
                              Tampa
                              Washington, D.C.
</TABLE>
 
<PAGE>
- --------------------------------------------------------------------------------
 
NUVEEN TAX-EXEMPT UNIT TRUST--INSURED, NATIONAL INSURED TRUST 265
SCHEDULE OF INVESTMENTS
DATE OF DEPOSIT MARCH 4, 1994
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                                                             Ratings
                                                                                    Optional         -----------------------
  Aggregate            Name of Issuer and Title of Issue Represented               Redemption        Standard
  Principal               by Sponsor's Contracts to Purchase Bonds                 Provisions        & Poor's       Moody's
  <C>       <C> <S>                                                              <C>                 <C>           <C>
  --------------------------------------------------------------------------------------------------------------------------
  $  750,000    Broward County, Florida, Certificates of Participation,            2004 at 102          AAA           Aaa
                  Series 1994A, 5.50% Due 6/1/13. (Original issue discount
                  bonds will be delivered on or about March 23, 1994 at a
                  price of 94.882% of principal amount.)(When issued.)
     550,000    Orlando (Florida) Utilities Commission, Water and Electric         2002 at 102          AAA           Aaa
                  Subordinated Revenue Bonds, Series 1992A, 6.00% Due
                  10/1/20.
   1,000,000    Illinois Health Facilities Authority, Revenue Bonds, Series        2004 at 102          AAA           Aaa
                  1994 (Southern Illinois Hospital Services), 5.90% Due
                  3/1/20. (When issued.)
     400,000    Metropolitan Pier and Exposition Authority (Illinois),             2003 at 102          AAA           Aaa
                  McCormick Place Expansion Project Bonds, Series 1992A,
                  6.50% Due 6/15/27.
     400,000    Solid Waste Agency of Northern Cook County (Illinois),             2003 at 100          AAA           Aaa
                  Contract Revenue Bonds, Series 1994, 5.50% Due 5/1/15.
                  (When issued.)
     750,000    Massachusetts Health and Educational Facilities Authority,         2003 at 102          AAA           Aaa
                  Revenue Bonds, Lahey Clinic Medical Center Issue, Series
                  B, 5.375% Due 7/1/23. (Original issue discount bonds
                  delivered on or about April 27, 1993 at a price of 94.511%
                  of principal amount.)
     305,000    North Carolina Municipal Power Agency Number 1, Catawba            2003 at 100          AAA           Aaa
                  Electric Revenue Bonds, Series 1992, 5.75% Due 1/1/20.
                  (Original issue discount bonds delivered on or about
                  December 10, 1992 at a price of 92.75% of principal
                  amount.)
     115,000    State of Ohio (Ohio Higher Educational Facility Commission),       2003 at 102          AAA           Aaa
                  Higher Educational Facility Revenue Bonds (Kenyon College
                  Project), 5.375% Due 12/1/16.
     750,000    Pennsylvania Intergovernmental Cooperation Authority,              2003 at 100          AAA           Aaa
                  Special Tax Revenue Bonds (City of Philadelphia Funding
                  Program), Series of 1993, 5.625% Due 6/15/23.
     780,000    Piedmont Municipal Power Agency (South Carolina), Electric         2003 at 102          AAA           Aaa
                  Revenue Bonds, 1992 Refunding Series, 6.30% Due 1/1/22.
     750,000    North Central Texas Health Facilities Development                  2003 at 100          AAA           Aaa
                  Corporation, Hospital Revenue Refunding Bonds (Children's
                  Medical Center of Dallas Project), Series 1993, 6.00% Due
                  8/15/16.
     750,000    Washington Public Power Supply System, Nuclear Project No. 1       2003 at 102          AAA           Aaa
                  Refunding Revenue Bonds, Series 1993A, 5.70% Due 7/1/17.
     200,000    Wisconsin Health and Educational Facilities Authority              2003 at 102          AAA           Aaa
                  Revenue Bonds, Series 1993 (Aurora Health Care Obligated
                  Group), 5.25% Due 8/15/23. (Original issue discount bonds
                  delivered on or about December 8, 1993 at a price of
                  92.911% of principal amount.)
  ----------
  $7,500,000
  ----------
  ----------
</TABLE>
 
<PAGE>
- --------------------------------------------------------------------------------
UNIT PRICE, ESTIMATED CURRENT RETURN AND ESTIMATED LONG TERM RETURN DEPEND ON
AMOUNT PURCHASED AND PAYMENT OPTION
Sales charge/volume discount applies on all concurrent purchases of any Nuveen
trust units. Estimated Current Return equals net income divided by offering
price. Estimated Long Term Return represents an average of the yields to
maturity (or call) of the Bonds in the Trust adjusted to reflect expenses and
sales charges.
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                              Estimated Current Return (2)
          AMOUNT PURCHASED                         Public      -----------------------------------------------------------
- -------------------------------------  Sales      Offering         Monthly           Quarterly            Semi-Annual
     Units              Dollars        Charge     Price (1)        Payment            Payment               Payment
- ----------------  -------------------  ------    -----------   ---------------    ---------------    ---------------------
<S>               <C>                  <C>       <C>           <C>       <C>      <C>       <C>      <C>       <C>
50-999                 $5,000-$99,999   4.90 %   $    102.67     (5.44%)  5.49%     (5.47%)  5.52%     (5.49%)  5.54%
1,000-2,499           100,000-249,999   4.50          102.24     (5.46)   5.51      (5.49)   5.55      (5.51)   5.56
2,500-4,999           250,000-499,999   4.25          101.97     (5.48)   5.53      (5.51)   5.56      (5.53)   5.58
5,000-9,999           500,000-999,999   3.50          101.18     (5.52)   5.57      (5.55)   5.60      (5.57)   5.62
10,000 and over    1,000,000 and over   3.00          100.66     (5.55)   5.60      (5.58)   5.63      (5.60)   5.65
</TABLE>
 
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                         Estimated Long Term Return (3)
                                                              -----------------------------------------------------
          AMOUNT PURCHASED                         Public
- -------------------------------------  Sales      Offering          Monthly         Quarterly       Semi-Annual
     Units              Dollars        Charge     Price (1)         Payment          Payment          Payment
- ----------------  -------------------  ------    -----------     -------------    -------------    -------------
<S>               <C>                  <C>       <C>         <C>                <C>              <C>
50-999                 $5,000-$99,999   4.90 %   $    102.67          5.51%            5.54%            5.55%
1,000-2,499           100,000-249,999   4.50          102.24          5.53             5.56             5.58
2,500-4,999           250,000-499,999   4.25          101.97          5.54             5.57             5.59
5,000-9,999           500,000-999,999   3.50          101.18          5.59             5.62             5.64
10,000 and over    1,000,000 and over   3.00          100.66          5.62             5.65             5.67
</TABLE>
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
(1) As of the business day prior to the Date of Deposit. Units are offered at
    the Public Offering Price plus accrued interest.
(2) All figures as of the business day prior to the Date of Deposit. Figures in
    brackets represent the current return. The first year's estimated current
    returns are slightly lower than those for subsequent years because a portion
    of the monies received in the first year only will be treated as a return of
    principal due to the inclusion in the portfolio of "when issued" or other
    Bonds having delivery dates after the date of settlement for a purchase made
    on the Date of Deposit.
(3) In contrast to Estimated Current Return, Estimated Long Term Return reflects
    the amortization of premium or accretion of discount, if any, on the bonds
    in the Trust's portfolio.
 
- --------------------------------------------------------------------------------
 
REINVESTMENT OPTIONS   Specify automatic reinvestment of trust income, with no
sales charge, to earn compounded dividends with Nuveen mutual funds.
- --------------------------------------------------------------------------------
 
INTEREST DISTRIBUTIONS TO UNITHOLDERS   Unitholders may elect to have interest
distributions made on a monthly, quarterly, or semi-annual basis. Record Dates
are May 1 and November 1 for semi-annual distributions; February 1, May 1,
August 1 and November 1 for quarterly distributions; and the first of each month
for monthly distributions. Details of interest distributions per unit under the
various plans appear in the following table based upon estimated net annual
interest income at the Date of Deposit:
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                                                                       Normal
                                                                                                                   Distributions
National Insured Trust                                   1994                                  1995                  per Year +
<S>                                     <C>            <C>            <C>            <C>            <C>            <C>
- -------------------------------------------------------------------------------------------------------------      --------------
Record Date*..........................        6/1            8/1           11/1            2/1            5/1
Distribution Date.....................       6/15           8/15          11/15           2/15           5/15
- ---------------------------------------------------------------------------------------------------------------------------------
Monthly Distribution Plan.............  $   .4698(1)                                                               $  5.6383
                                                             --------    $.4698 every month    --------
Quarterly Distribution Plan...........  $   .4698(1)   $   .9450(2)   $  1.4175      $  1.4175      $  1.4175      $  5.6703
Semi-Annual Distribution Plan.........  $   .4698(1)                  $  2.3705(3)                  $  2.8446      $  5.6893
- ---------------------------------------------------------------------------------------------------------------------------------
<FN>
  * Record Dates for semi-annual distributions are May 1 and November 1; for quarterly distributions, they are February 1, May 1,
    August 1 and November 1. Record Dates for monthly distributions are the first day of each month.
(1) The first distribution will be paid to all Unitholders, regardless of the distribution plan selected.
(2) The second distribution under the quarterly distribution plan represents a 2-month distribution; subsequent quarterly
    distributions will be regular 3-month distributions.
(3) The second distribution under the semi-annual distribution plan represents a 5-month distribution; subsequent semi-annual
    distributions will be regular 6-month distributions.
</TABLE>
 
+ Interest for Unitholders of this series began to accrue as of the Date of
Deposit. Units purchased on the Date of Deposit will have $.11 of accrued
interest that will be added to the Public Offering Price on the Settlement Date.
After provision for expenses of the Fund, the daily rate of accrual from the
Date of Deposit to the first Record Date is $.01566 per unit per day.
Consequently, on the first Record Date (06/01/94), accrued interest will total
$1.3624 per unit for the 87-day period. Because a substantial portion of this
interest will not yet be due from the issuers of the bonds in the Fund, the
first payment to all Unitholders of Record on 06/01/94 is $.4698, and the
remaining $.8926 of accrued interest will remain an asset of the Trust and be
distributed in subsequent periods as portfolio bonds mature, or are redeemed, or
sold and the accrued interest on these bonds is collected. After the first
Record Date daily rates of accrual are:
              Monthly - $0.01566              Quarterly - $0.01575
                             Semi-Annual - $0.01580
This daily rate of accrual, and the annual distributions shown above, will
remain the same as long as the portfolio size and composition remain the same.
 
- --------------------------------------------------------------------------------
<PAGE>
- -------------------------------------------------
 
DIVERSIFICATION OF PORTFOLIO INCOME
 
There are 13 Tax-exempt bond issues in this trust; this diversified portfolio
yields current income from issuers in 10 states.
- -------------------------------------------------
<TABLE>
<CAPTION>
                   Percent
                   of Total
                   Income
<S>                    <C>        <C>
- ------------------------
                                  %
Florida                     17.1
Illinois                    24.7
Massachusetts                9.3
North Carolina               4.0
Ohio                         1.4
 
<CAPTION>
                   Percent
                   of Total
                   Income
- ------------------------
<S>                    <C>        <C>
                                  %
Pennsylvania                 9.7
South Carolina              11.3
Texas                       10.3
Washington                   9.8
Wisconsin                    2.4
</TABLE>
 
- -------------------------------------------------
 
AVERAGE PORTFOLIO LIFE   The average maturity of portfolio bonds is 25.8 years.
The first bond is scheduled to mature in June, 2013, with the last bond maturity
being June, 2027.
 
- -------------------------------------------------
 
BONDS INSURED BY MBIA   Each bond in this Nuveen Insured series has been
insured* by the Municipal Bond Investors Assurance Corporation, which guarantees
timely payments of principal and interest. Premium payments have been fully paid
by the Date of Deposit.
 
- -------------------------------------------------
 
CALL PROTECTION   Bonds are first subject to optional redemption by the issuers
in the years and at the prices shown under the Redemption Provisions column in
the Schedule of Investments. Unless otherwise stated, in subsequent years, bonds
are redeemable at declining prices, but not usually below par value. Some issues
or some portions of issues may also be subject to sinking fund redemption or
extraordinary redemption without premium prior to the dates shown.
 
- -------------------------------------------------
 
* Insurance relates specifically to the bonds and not to the units or to the
  market value of units. Terms of the insurance are more fully described in the
  prospectus. No representation is made as to the insurer's ability to meet its
  commitments. See Section 5 of the prospectus for details.
 
- -------------------------------------------------------
 
FOR A PROSPECTUS CONTAINING MORE COMPLETE INFORMATION, INCLUDING CHARGES AND
EXPENSES, ON THIS NUVEEN TAX-EXEMPT UNIT TRUST AND ANY OTHER NUVEEN FUND, CALL
YOUR BROKER . . . OR NUVEEN AT
 
                                 1-800-351-4100
 
READ THE PROSPECTUS CAREFULLY BEFORE YOU INVEST OR SEND MONEY.
 
718
<PAGE>
NUVEEN  Tax-Exempt Unit Trusts
     NUVEEN
     SHORT INTERMEDIATE
     INSURED
     TRUST 28
 
            Estimated Current Return
            First
            Year: 4.10% to 4.20%
            Subsequent
            Years: 4.15% to 4.25%
            as of 03/03/94
 
            Estimated Long Term Return
            4.37% to 4.46%
             100,000 units in a
             diversified $10,000,000
             portfolio of tax-exempt
             bonds rated "AAA"
                  Cusip:
                  6710A0 130 Monthly Payment Option
                  6710A0 148 Quarterly Payment Option
                  6710A0 155 Semi-Annual Payment Option
 
                  Registered in all states
                    John Nuveen & Co. Incorporated
                    Investment Bankers
<PAGE>
 
<TABLE>
<S>                           <C>
Chicago:                      Atlanta
333 W. Wacker Dr.             Austin
Chicago, Illinois 60606       Boca Raton
Telephone: 312.917.7700       Boston
                              Columbus
New York:                     Dallas/Ft. Worth
Swiss Bank Tower              Irvine
10 East 50th Street           Los Angeles
New York, New York 10022      Philadelphia
Telephone: 212.207.2000       Phoenix
                              San Francisco
                              Seattle
                              Tampa
                              Washington, D.C.
</TABLE>
 
<PAGE>
- --------------------------------------------------------------------------------
 
NUVEEN TAX-EXEMPT UNIT TRUST--INSURED, SHORT INTERMEDIATE INSURED TRUST 28
SCHEDULE OF INVESTMENTS
DATE OF DEPOSIT MARCH 4, 1994
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                                                             Ratings
                                                                                    Optional         -----------------------
  Aggregate            Name of Issuer and Title of Issue Represented               Redemption        Standard
  Principal               by Sponsor's Contracts to Purchase Bonds                 Provisions        & Poor's       Moody's
  <C>       <C> <S>                                                              <C>                 <C>           <C>
  --------------------------------------------------------------------------------------------------------------------------
  $  500,000    The Board of Trustees of the University of Alabama, The            No Optional          AAA           Aaa
                  University of Alabama in Huntsville, Student Housing                Call
                  Revenue Bonds, Series 1994-A,
                200M-3.70% Due 6/1/98,
                300M-3.90% Due 6/1/99.
   1,000,000    City of Phoenix, Arizona, Senior Lien Street and Highway           No Optional          AAA           Aaa
                  User Revenue Refunding Bonds, Series 1992, 5.75% Due                Call
                  7/1/99.
     500,000    City of Tucson, Arizona, Junior Lien Street and Highway User       No Optional          AAA           Aaa
                  Revenue Refunding Bonds, Series 1993, 4.60% Due 7/1/99.             Call
   1,000,000    Desert Sands Unified School District (California), Refunding       No Optional          AAA           Aaa
                  Certificates of Participation (Measure O Project), 1994             Call
                  Series D, 4.10% Due 3/1/99. (When issued.)
     300,000    District of Columbia (Washington, D.C.), General Obligation        No Optional          AAA           Aaa
                  Refunding Bonds (Series 1989B), 0.00% Due 6/1/99.                   Call
                  (Original issue discount bonds delivered on or about
                  August 1, 1989 at a price of 52.058% of principal amount.)
   1,000,000    Broward County, Florida, Certificates of Participation,            No Optional          AAA           Aaa
                  Series 1994A, 4.75% Due 6/1/99. (When issued.)                      Call
   1,450,000    City of Homestead, Florida, Special Insurance Assessment           No Optional          AAA           Aaa
                  Revenue Bonds, Series 1993 (Hurricane Andrew Covered                Call
                  Claims Assistance Program), 4.75% Due 3/1/99.
     665,000    Illinois Health Facilities Authority, Revenue Bonds, Series        No Optional          AAA           Aaa
                  1994 (Southern Illinois Hospital Services), 4.75% Due               Call
                  3/1/99. (When issued.)
   1,000,000    Public Building Commission of Chicago (Illinois), Building         No Optional          AAA           Aaa
                  Revenue Bonds, Series A of 1993 (Board of Education of the          Call
                  City of Chicago), 4.70% Due 12/1/99. (General Obligation
                  Bonds.)
     585,000    The Industrial Development Authority of the County of              No Optional          AAA           Aaa
                  Jackson, State of Missouri Health Care System Revenue               Call
                  Bonds, Saint Joseph Health Center Issue, Series 1993,
                  4.05% Due 7/1/98.
   1,000,000    Port of Seattle, Washington, Revenue Refunding Bonds, Series       No Optional          AAA           Aaa
                  1994C, 3.80% Due 7/1/98. (When issued.)                             Call
   1,000,000    Washington Health Care Facilities Authority Revenue Bonds,         No Optional          AAA           Aaa
                  Series 1994 (Sisters of St. Joseph of Peace, Health and             Call
                  Hospital Services),
                500M-4.10% Due 3/1/98,
                500M-4.25% Due 3/1/99.
  ----------
  $10,000,000
  ----------
  ----------
</TABLE>
 
<PAGE>
- --------------------------------------------------------------------------------
UNIT PRICE, ESTIMATED CURRENT RETURN AND ESTIMATED LONG TERM RETURN DEPEND ON
AMOUNT PURCHASED AND PAYMENT OPTION
Sales charge/volume discount applies on all concurrent purchases of any Nuveen
trust units. Estimated Current Return equals net income divided by offering
price. Estimated Long Term Return represents an average of the yields to
maturity (or call) of the Bonds in the Trust adjusted to reflect expenses and
sales charges.
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                              Estimated Current Return (2)
          AMOUNT PURCHASED                         Public      -----------------------------------------------------------
- -------------------------------------  Sales      Offering         Monthly           Quarterly            Semi-Annual
     Units              Dollars        Charge     Price (1)        Payment            Payment               Payment
- ----------------  -------------------  ------    -----------   ---------------    ---------------    ---------------------
<S>               <C>                  <C>       <C>           <C>       <C>      <C>       <C>      <C>       <C>
50-999                 $5,000-$99,999   3.00 %   $    101.96     (4.10%)  4.15%     (4.13%)  4.18%     (4.15%)  4.20%
1,000-2,499           100,000-249,999   2.60          101.54     (4.12)   4.17      (4.15)   4.20      (4.17)   4.22
2,500-4,999           250,000-499,999   2.35          101.28     (4.13)   4.18      (4.16)   4.21      (4.18)   4.23
5,000-9,999           500,000-999,999   2.10          101.02     (4.14)   4.19      (4.17)   4.22      (4.19)   4.24
10,000 and over    1,000,000 and over   1.85          100.76     (4.15)   4.20      (4.18)   4.23      (4.20)   4.25
</TABLE>
 
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                         Estimated Long Term Return (3)
                                                              -----------------------------------------------------
          AMOUNT PURCHASED                         Public
- -------------------------------------  Sales      Offering          Monthly         Quarterly       Semi-Annual
     Units              Dollars        Charge     Price (1)         Payment          Payment          Payment
- ----------------  -------------------  ------    -----------     -------------    -------------    -------------
<S>               <C>                  <C>       <C>         <C>                <C>              <C>
50-999                 $5,000-$99,999   3.00 %   $    101.96          4.37%            4.39%            4.41%
1,000-2,499           100,000-249,999   2.60          101.54          4.38             4.41             4.43
2,500-4,999           250,000-499,999   2.35          101.28          4.39             4.42             4.44
5,000-9,999           500,000-999,999   2.10          101.02          4.41             4.44             4.45
10,000 and over    1,000,000 and over   1.85          100.76          4.42             4.44             4.46
</TABLE>
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
(1) As of the business day prior to the Date of Deposit. Units are offered at
    the Public Offering Price plus accrued interest.
(2) All figures as of the business day prior to the Date of Deposit. Figures in
    brackets represent the current return. The first year's estimated current
    returns are slightly lower than those for subsequent years because a portion
    of the monies received in the first year only will be treated as a return of
    principal due to the inclusion in the portfolio of "when issued" or other
    Bonds having delivery dates after the date of settlement for a purchase made
    on the Date of Deposit.
(3) In contrast to Estimated Current Return, Estimated Long Term Return reflects
    the amortization of premium or accretion of discount, if any, on the bonds
    in the Trust's portfolio.
 
- --------------------------------------------------------------------------------
 
REINVESTMENT OPTIONS   Specify automatic reinvestment of trust income, with no
sales charge, to earn compounded dividends with Nuveen mutual funds.
- --------------------------------------------------------------------------------
 
INTEREST DISTRIBUTIONS TO UNITHOLDERS   Unitholders may elect to have interest
distributions made on a monthly, quarterly, or semi-annual basis. Record Dates
are May 1 and November 1 for semi-annual distributions; February 1, May 1,
August 1 and November 1 for quarterly distributions; and the first of each month
for monthly distributions. Details of interest distributions per unit under the
various plans appear in the following table based upon estimated net annual
interest income at the Date of Deposit:
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                                                                       Normal
                                                                                                                   Distributions
Short Intermediate Insured Trust                         1994                                  1995                  per Year +
<S>                                     <C>            <C>            <C>            <C>            <C>            <C>
- -------------------------------------------------------------------------------------------------------------      --------------
Record Date*..........................        6/1            8/1           11/1            2/1            5/1
Distribution Date.....................       6/15           8/15          11/15           2/15           5/15
- ---------------------------------------------------------------------------------------------------------------------------------
Monthly Distribution Plan.............  $   .3527(1)                                                               $  4.2336
                                                             --------    $.3527 every month    --------
Quarterly Distribution Plan...........  $   .3527(1)   $   .7109(2)   $  1.0663      $  1.0663      $  1.0663      $  4.2656
Semi-Annual Distribution Plan.........  $   .3527(1)                  $  1.7852(3)                  $  2.1422      $  4.2846
- ---------------------------------------------------------------------------------------------------------------------------------
<FN>
  * Record Dates for semi-annual distributions are May 1 and November 1; for quarterly distributions, they are February 1, May 1,
    August 1 and November 1. Record Dates for monthly distributions are the first day of each month.
(1) The first distribution will be paid to all Unitholders, regardless of the distribution plan selected.
(2) The second distribution under the quarterly distribution plan represents a 2-month distribution; subsequent quarterly
    distributions will be regular 3-month distributions.
(3) The second distribution under the semi-annual distribution plan represents a 5-month distribution; subsequent semi-annual
    distributions will be regular 6-month distributions.
</TABLE>
 
+ Interest for Unitholders of this series began to accrue as of the Date of
Deposit. Units purchased on the Date of Deposit will have $.08 of accrued
interest that will be added to the Public Offering Price on the Settlement Date.
After provision for expenses of the Fund, the daily rate of accrual from the
Date of Deposit to the first Record Date is $.01176 per unit per day.
Consequently, on the first Record Date (06/01/94), accrued interest will total
$1.0231 per unit for the 87-day period. Because a substantial portion of this
interest will not yet be due from the issuers of the bonds in the Fund, the
first payment to all Unitholders of Record on 06/01/94 is $.3527, and the
remaining $.6704 of accrued interest will remain an asset of the Trust and be
distributed in subsequent periods as portfolio bonds mature, or are redeemed, or
sold and the accrued interest on these bonds is collected. After the first
Record Date daily rates of accrual are:
              Monthly - $0.01176              Quarterly - $0.01185
                             Semi-Annual - $0.01190
This daily rate of accrual, and the annual distributions shown above, will
remain the same as long as the portfolio size and composition remain the same.
 
- --------------------------------------------------------------------------------
<PAGE>
- -------------------------------------------------
 
DIVERSIFICATION OF PORTFOLIO INCOME
 
There are 12 Tax-exempt bond issues in this trust; this diversified portfolio
yields current income from issuers in 7 states.
- -------------------------------------------------
<TABLE>
<CAPTION>
                   Percent
                   of Total
                   Income
<S>                    <C>        <C>
- ------------------------
                                  %
Alabama                      4.4
Arizona                     18.3
California                   9.3
Florida                     26.5
 
<CAPTION>
                   Percent
                   of Total
                   Income
- ------------------------
<S>                    <C>        <C>
                                  %
Illinois                    17.9
Missouri                     5.4
Washington                  18.2
</TABLE>
 
- -------------------------------------------------
 
AVERAGE PORTFOLIO LIFE   The average maturity of portfolio bonds is 5.0 years.
The first bond is scheduled to mature in March, 1998, with the last bond
maturity being December, 1999.
 
- -------------------------------------------------
 
BONDS INSURED BY MBIA   Each bond in this Nuveen Insured series has been
insured* by the Municipal Bond Investors Assurance Corporation, which guarantees
timely payments of principal and interest. Premium payments have been fully paid
by the Date of Deposit.
 
- -------------------------------------------------
 
CALL PROTECTION   Bonds are first subject to optional redemption by the issuers
in the years and at the prices shown under the Redemption Provisions column in
the Schedule of Investments. Unless otherwise stated, in subsequent years, bonds
are redeemable at declining prices, but not usually below par value. Some issues
or some portions of issues may also be subject to sinking fund redemption or
extraordinary redemption without premium prior to the dates shown.
 
- -------------------------------------------------
 
* Insurance relates specifically to the bonds and not to the units or to the
  market value of units. Terms of the insurance are more fully described in the
  prospectus. No representation is made as to the insurer's ability to meet its
  commitments. See Section 5 of the prospectus for details.
 
- -------------------------------------------------------
 
FOR A PROSPECTUS CONTAINING MORE COMPLETE INFORMATION, INCLUDING CHARGES AND
EXPENSES, ON THIS NUVEEN TAX-EXEMPT UNIT TRUST AND ANY OTHER NUVEEN FUND, CALL
YOUR BROKER . . . OR NUVEEN AT
 
                                 1-800-351-4100
 
READ THE PROSPECTUS CAREFULLY BEFORE YOU INVEST OR SEND MONEY.
 
718
<PAGE>
NUVEEN  Tax-Exempt Unit Trusts
     NUVEEN
     FLORIDA
     INSURED
     TRUST 186
 
            Estimated Current Return
            First
            Year: 5.29% to 5.45%
            Subsequent
            Years: 5.32% to 5.48%
            as of 03/03/94
 
            Estimated Long Term Return
            5.36% to 5.53%
             30,000 units in a
             diversified $3,000,000
             portfolio of tax-exempt
             bonds rated "AAA"
                  Cusip:
                  6706H3 168 Monthly Payment Option
                  6706H3 176 Quarterly Payment Option
                  6706H3 184 Semi-Annual Payment Option
 
                  Registered in Florida
                    John Nuveen & Co. Incorporated
                    Investment Bankers
 
<TABLE>
<S>                           <C>
Chicago:                      Atlanta
333 W. Wacker Dr.             Austin
Chicago, Illinois 60606       Boca Raton
Telephone: 312.917.7700       Boston
                              Columbus
New York:                     Dallas/Ft. Worth
Swiss Bank Tower              Irvine
10 East 50th Street           Philadelphia
New York, New York 10022      Phoenix
Telephone: 212.207.2000       San Francisco
                              Seattle
                              Tampa
                              Washington, D.C.
</TABLE>
 
<PAGE>
- --------------------------------------------------------------------------------
 
NUVEEN TAX-EXEMPT UNIT TRUST--INSURED, FLORIDA INSURED TRUST 186
SCHEDULE OF INVESTMENTS
DATE OF DEPOSIT MARCH 4, 1994
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                                                             Ratings
                                                                                    Optional         -----------------------
  Aggregate            Name of Issuer and Title of Issue Represented               Redemption        Standard
  Principal               by Sponsor's Contracts to Purchase Bonds                 Provisions        & Poor's       Moody's
  <C>       <C> <S>                                                              <C>                 <C>           <C>
  --------------------------------------------------------------------------------------------------------------------------
  $  450,000    Broward County, Florida, Certificates of Participation,            2004 at 102          AAA           Aaa
                  Series 1994A, 5.50% Due 6/1/13. (Original issue discount
                  bonds will be delivered on or about March 23, 1994 at a
                  price of 94.882% of principal amount.)(When issued.)
     450,000    Dade County, Florida, Public Facilities Revenue Bonds              2003 at 102          AAA           Aaa
                  (Jackson Memorial Hospital), Series 1993, 5.25% Due
                  6/1/23. (Original issue discount bonds delivered on or
                  about June 15, 1993 at a price of 92.625% of principal
                  amount.)
     290,000    Lee County, Florida, Capital and Transportation Facilities         2003 at 102          AAA           Aaa
                  Refunding Revenue Bonds, Series 1993A, 5.60% Due 10/1/21.
     450,000    Orange County (Florida), Health Facilities Authority               2002 at 102          AAA           Aaa
                  Hospital Revenue Bonds (Orlando Regional Healthcare System
                  Project), Series 1993, 6.00% Due 11/1/24.
     450,000    Orlando (Florida) Utilities Commission, Water and Electric         2002 at 102          AAA           Aaa
                  Subordinated Revenue Bonds, Series 1992A, 6.00% Due
                  10/1/20.
     450,000    City of Tampa, Florida, Allegany Health System Revenue             2003 at 102          AAA           Aaa
                  Bonds, St. Joseph's Hospital, Inc. Issue, Series 1993,
                  5.125% Due 12/1/23. (Original issue discount bonds
                  delivered on or about January 4, 1994 at a price of
                  94.522% of principal amount.)
     460,000    Commonwealth of Puerto Rico, Public Improvement Refunding          2003 at 101          AAA           Aaa
                  Bonds, Series 1993 (General Obligation Bonds.), 5.25% Due            1/2
                  7/1/18. (Original issue discount bonds delivered on or
                  about July 15, 1993 at a price of 93.414% of principal
                  amount.)
  ----------
  $3,000,000
  ----------
  ----------
</TABLE>
 
<PAGE>
- --------------------------------------------------------------------------------
UNIT PRICE, ESTIMATED CURRENT RETURN AND ESTIMATED LONG TERM RETURN DEPEND ON
AMOUNT PURCHASED AND PAYMENT OPTION
Sales charge/volume discount applies on all concurrent purchases of any Nuveen
trust units. Estimated Current Return equals net income divided by offering
price. Estimated Long Term Return represents an average of the yields to
maturity (or call) of the Bonds in the Trust adjusted to reflect expenses and
sales charges.
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                              Estimated Current Return (2)
          AMOUNT PURCHASED                         Public      -----------------------------------------------------------
- -------------------------------------  Sales      Offering         Monthly           Quarterly            Semi-Annual
     Units              Dollars        Charge     Price (1)        Payment            Payment               Payment
- ----------------  -------------------  ------    -----------   ---------------    ---------------    ---------------------
<S>               <C>                  <C>       <C>           <C>       <C>      <C>       <C>      <C>       <C>
50-999                 $5,000-$99,999   4.90 %   $    100.55     (5.29%)  5.32%     (5.32%)  5.35%     (5.34%)  5.37%
1,000-2,499           100,000-249,999   4.50          100.13     (5.31)   5.34      (5.35)   5.37      (5.37)   5.39
2,500-4,999           250,000-499,999   4.25           99.86     (5.33)   5.36      (5.36)   5.39      (5.38)   5.41
5,000-9,999           500,000-999,999   3.50           99.09     (5.37)   5.40      (5.40)   5.43      (5.42)   5.45
10,000 and over    1,000,000 and over   3.00           98.58     (5.40)   5.42      (5.43)   5.46      (5.45)   5.48
</TABLE>
 
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                         Estimated Long Term Return (3)
                                                              -----------------------------------------------------
          AMOUNT PURCHASED                         Public
- -------------------------------------  Sales      Offering          Monthly         Quarterly       Semi-Annual
     Units              Dollars        Charge     Price (1)         Payment          Payment          Payment
- ----------------  -------------------  ------    -----------     -------------    -------------    -------------
<S>               <C>                  <C>       <C>         <C>                <C>              <C>
50-999                 $5,000-$99,999   4.90 %   $    100.55          5.36%            5.40%            5.42%
1,000-2,499           100,000-249,999   4.50          100.13          5.39             5.42             5.44
2,500-4,999           250,000-499,999   4.25           99.86          5.40             5.44             5.46
5,000-9,999           500,000-999,999   3.50           99.09          5.44             5.48             5.50
10,000 and over    1,000,000 and over   3.00           98.58          5.47             5.51             5.53
</TABLE>
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
(1) As of the business day prior to the Date of Deposit. Units are offered at
    the Public Offering Price plus accrued interest.
(2) All figures as of the business day prior to the Date of Deposit. Figures in
    brackets represent the current return. The first year's estimated current
    returns are slightly lower than those for subsequent years because a portion
    of the monies received in the first year only will be treated as a return of
    principal due to the inclusion in the portfolio of "when issued" or other
    Bonds having delivery dates after the date of settlement for a purchase made
    on the Date of Deposit.
(3) In contrast to Estimated Current Return, Estimated Long Term Return reflects
    the amortization of premium or accretion of discount, if any, on the bonds
    in the Trust's portfolio.
 
- --------------------------------------------------------------------------------
 
INTEREST DISTRIBUTIONS TO UNITHOLDERS   Unitholders may elect to have interest
distributions made on a monthly, quarterly, or semi-annual basis. Record Dates
are May 1 and November 1 for semi-annual distributions; February 1, May 1,
August 1 and November 1 for quarterly distributions; and the first of each month
for monthly distributions. Details of interest distributions per unit under the
various plans appear in the following table based upon estimated net annual
interest income at the Date of Deposit:
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                                                                       Normal
                                                                                                                   Distributions
Florida Insured Trust                                    1994                                  1995                  per Year +
<S>                                     <C>            <C>            <C>            <C>            <C>            <C>
- -------------------------------------------------------------------------------------------------------------      --------------
Record Date*..........................        6/1            8/1           11/1            2/1            5/1
Distribution Date.....................       6/15           8/15          11/15           2/15           5/15
- ---------------------------------------------------------------------------------------------------------------------------------
Monthly Distribution Plan.............  $   .4456(1)                                                               $  5.3478
                                                             --------    $.4456 every month    --------
Quarterly Distribution Plan...........  $   .4456(1)   $   .8966(2)   $  1.3449      $  1.3449      $  1.3449      $  5.3798
Semi-Annual Distribution Plan.........  $   .4456(1)                  $  2.2494(3)                  $  2.6993      $  5.3988
- ---------------------------------------------------------------------------------------------------------------------------------
<FN>
  * Record Dates for semi-annual distributions are May 1 and November 1; for quarterly distributions, they are February 1, May 1,
    August 1 and November 1. Record Dates for monthly distributions are the first day of each month.
(1) The first distribution will be paid to all Unitholders, regardless of the distribution plan selected.
(2) The second distribution under the quarterly distribution plan represents a 2-month distribution; subsequent quarterly
    distributions will be regular 3-month distributions.
(3) The second distribution under the semi-annual distribution plan represents a 5-month distribution; subsequent semi-annual
    distributions will be regular 6-month distributions.
</TABLE>
 
+ Interest for Unitholders of this series began to accrue as of the Date of
Deposit. Units purchased on the Date of Deposit will have $.10 of accrued
interest that will be added to the Public Offering Price on the Settlement Date.
After provision for expenses of the Fund, the daily rate of accrual from the
Date of Deposit to the first Record Date is $.01485 per unit per day.
Consequently, on the first Record Date (06/01/94), accrued interest will total
$1.2919 per unit for the 87-day period. Because a substantial portion of this
interest will not yet be due from the issuers of the bonds in the Fund, the
first payment to all Unitholders of Record on 06/01/94 is $.4456, and the
remaining $.8463 of accrued interest will remain an asset of the Trust and be
distributed in subsequent periods as portfolio bonds mature, or are redeemed, or
sold and the accrued interest on these bonds is collected. After the first
Record Date daily rates of accrual are:
              Monthly - $0.01485              Quarterly - $0.01494
                             Semi-Annual - $0.01500
This daily rate of accrual, and the annual distributions shown above, will
remain the same as long as the portfolio size and composition remain the same.
 
- --------------------------------------------------------------------------------
 
                                                          718
<PAGE>
- -------------------------------------------------------
 
AVERAGE PORTFOLIO LIFE   The average maturity of portfolio bonds is 26.7 years.
The first bond is scheduled to mature in June, 2013, with the last bond maturity
being November, 2024.
 
- -------------------------------------------------
 
BONDS INSURED BY MBIA   Each bond in this Nuveen Insured series has been
insured* by the Municipal Bond Investors Assurance Corporation, which guarantees
timely payments of principal and interest. Premium payments have been fully paid
by the Date of Deposit.
 
- -------------------------------------------------
 
CALL PROTECTION   Bonds are first subject to optional redemption by the issuers
in the years and at the prices shown under the Redemption Provisions column in
the Schedule of Investments. Unless otherwise stated, in subsequent years, bonds
are redeemable at declining prices, but not usually below par value. Some issues
or some portions of issues may also be subject to sinking fund redemption or
extraordinary redemption without premium prior to the dates shown.
 
- -------------------------------------------------
 
NO CHARGE FOR REDEMPTION   The Trustee, United States Trust Company of New York,
will redeem units at net asset value. In addition, John Nuveen & Co.
Incorporated intends to maintain a secondary market for this Nuveen Tax-Exempt
Unit Trust. Inasmuch as all securities investments are subject to market price
fluctuation, net asset value at the time of redemption could be more or less
than the initial investment.
 
- -------------------------------------------------
 
REINVESTMENT OPTIONS   Specify automatic reinvestment of trust income, with no
sales charge, to earn compounded dividends with Nuveen mutual funds.
 
- -------------------------------------------------
 
* Insurance relates specifically to the bonds and not to the units or to the
  market value of units. Terms of the insurance are more fully described in the
  prospectus. No representation is made as to the insurer's ability to meet its
  commitments. See Section 5 of the prospectus for details.
- -------------------------------------------------------
 
FOR A PROSPECTUS CONTAINING MORE COMPLETE INFORMATION, INCLUDING CHARGES AND
EXPENSES, ON THIS NUVEEN TAX-EXEMPT UNIT TRUST AND ANY OTHER NUVEEN FUND, CALL
YOUR BROKER . . . OR NUVEEN AT
 
                                 1-800-351-4100
 
READ THE PROSPECTUS CAREFULLY BEFORE YOU INVEST OR SEND MONEY.
<PAGE>
NUVEEN  Tax-Exempt Unit Trusts
     NUVEEN
     OHIO
     INSURED
     TRUST 112
 
            Estimated Current Return
            5.23% to 5.39%
            as of 03/03/94
 
            Estimated Long Term Return
            5.31% to 5.46%
             35,000 units in a
             diversified $3,500,000
             portfolio of tax-exempt
             bonds rated "AAA"
                  Cusip:
                  67101Y 318 Monthly Payment Option
                  67101Y 326 Quarterly Payment Option
                  67101Y 334 Semi-Annual Payment Option
 
                  Registered in Ohio
                    John Nuveen & Co. Incorporated
                    Investment Bankers
 
<TABLE>
<S>                           <C>
Chicago:                      Atlanta
333 W. Wacker Dr.             Austin
Chicago, Illinois 60606       Boca Raton
Telephone: 312.917.7700       Boston
                              Columbus
New York:                     Dallas/Ft. Worth
Swiss Bank Tower              Irvine
10 East 50th Street           Philadelphia
New York, New York 10022      Phoenix
Telephone: 212.207.2000       San Francisco
                              Seattle
                              Tampa
                              Washington, D.C.
</TABLE>
 
<PAGE>
- --------------------------------------------------------------------------------
 
NUVEEN TAX-EXEMPT UNIT TRUST--INSURED, OHIO INSURED TRUST 112
SCHEDULE OF INVESTMENTS
DATE OF DEPOSIT MARCH 4, 1994
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                                                             Ratings
                                                                                    Optional         -----------------------
  Aggregate            Name of Issuer and Title of Issue Represented               Redemption        Standard
  Principal               by Sponsor's Contracts to Purchase Bonds                 Provisions        & Poor's       Moody's
  <C>       <C> <S>                                                              <C>                 <C>           <C>
  --------------------------------------------------------------------------------------------------------------------------
  $  500,000    Ohio Air Quality Development Authority, State of Ohio,             2004 at 102          AAA           Aaa
                  Collateralized Air Quality Development Revenue Refunding
                  Bonds, 1994 Series B (The Cincinnati Gas & Electric
                  Company Project), 5.45% Due 1/1/24.
     420,000    State of Ohio (Ohio Higher Educational Facility Commission),       2003 at 102          AAA           Aaa
                  Higher Educational Facility Revenue Bonds (Kenyon College
                  Project), 5.375% Due 12/1/16.
     375,000    State of Ohio, Turnpike Revenue Bonds, 1994 Series A, Issued       2004 at 102          AAA           Aaa
                  by the Ohio Turnpike Commission, 5.75% Due 2/15/24. (When
                  issued.)
     500,000    County of Cuyahoga, Ohio, Hospital Facilities Refunding            2004 at 102          AAA           Aaa
                  Revenue Bonds, Series 1994A (Health Cleveland, Inc.)
                  (Fairview General Hospital Project), 5.50% Due 8/15/19.
     525,000    City of Hamilton] Ohio, Gas System Revenue Bonds, 1993             2003 at 102          AAA           Aaa
                  Series A, 5.00% Due 10/15/18.
     480,000    County of Lucas, Ohio, Hospital Refunding Revenue Bonds,           2003 at 102          AAA           Aaa
                  Series 1993C (St. Vincent Medical Center), 5.375% Due
                  8/15/17.
     200,000    County of Lucas, Ohio, Hospital Improvement and Refunding          2003 at 102          AAA           Aaa
                  Revenue Bonds, Series 1993 (The Toledo Hospital), 5.00%
                  Due 11/15/22. (Original issue discount bonds delivered on
                  or about July 29, 1993 at a price of 91.402% of principal
                  amount.)
     500,000    The University of Toledo (A State University of Ohio),             2002 at 102          AAA           Aaa
                  General Receipts Bonds, Series 1992A, 5.90% Due 6/1/20.
  ----------
  $3,500,000
  ----------
  ----------
</TABLE>
 
<PAGE>
- --------------------------------------------------------------------------------
UNIT PRICE, ESTIMATED CURRENT RETURN AND ESTIMATED LONG TERM RETURN DEPEND ON
AMOUNT PURCHASED AND PAYMENT OPTION
Sales charge/volume discount applies on all concurrent purchases of any Nuveen
trust units. Estimated Current Return equals net income divided by offering
price. Estimated Long Term Return represents an average of the yields to
maturity (or call) of the Bonds in the Trust adjusted to reflect expenses and
sales charges.
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                          Estimated Current Return (2)
                                                              -----------------------------------------------------
          AMOUNT PURCHASED                         Public
- -------------------------------------  Sales      Offering          Monthly         Quarterly       Semi-Annual
     Units              Dollars        Charge     Price (1)         Payment          Payment          Payment
- ----------------  -------------------  ------    -----------     -------------    -------------    -------------
<S>               <C>                  <C>       <C>         <C>                <C>              <C>
50-999                 $5,000-$99,999   4.90 %   $    100.62          5.23%            5.27%            5.28%
1,000-2,499           100,000-249,999   4.50          100.20          5.26             5.29             5.31
2,500-4,999           250,000-499,999   4.25           99.94          5.27             5.30             5.32
5,000-9,999           500,000-999,999   3.50           99.16          5.31             5.34             5.36
10,000 and over    1,000,000 and over   3.00           98.65          5.34             5.37             5.39
</TABLE>
 
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                         Estimated Long Term Return (3)
                                                              -----------------------------------------------------
          AMOUNT PURCHASED                         Public
- -------------------------------------  Sales      Offering          Monthly         Quarterly       Semi-Annual
     Units              Dollars        Charge     Price (1)         Payment          Payment          Payment
- ----------------  -------------------  ------    -----------     -------------    -------------    -------------
<S>               <C>                  <C>       <C>         <C>                <C>              <C>
50-999                 $5,000-$99,999   4.90 %   $    100.62          5.31%            5.34%            5.35%
1,000-2,499           100,000-249,999   4.50          100.20          5.33             5.36             5.38
2,500-4,999           250,000-499,999   4.25           99.94          5.34             5.37             5.39
5,000-9,999           500,000-999,999   3.50           99.16          5.39             5.41             5.43
10,000 and over    1,000,000 and over   3.00           98.65          5.41             5.44             5.46
</TABLE>
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
(1) As of the business day prior to the Date of Deposit. Units are offered at
    the Public Offering Price plus accrued interest.
(2) All figures as of the business day prior to Date of Deposit. The estimated
    current return for purchases made on such date will be as shown, as long as
    the portfolio size and composition remain the same.
(3) In contrast to Estimated Current Return, Estimated Long Term Return reflects
    the amortization of premium or accretion of discount, if any, on the bonds
    in the Trust's portfolio.
 
- --------------------------------------------------------------------------------
 
INTEREST DISTRIBUTIONS TO UNITHOLDERS   Unitholders may elect to have interest
distributions made on a monthly, quarterly, or semi-annual basis. Record Dates
are May 1 and November 1 for semi-annual distributions; February 1, May 1,
August 1 and November 1 for quarterly distributions; and the first of each month
for monthly distributions. Details of interest distributions per unit under the
various plans appear in the following table based upon estimated net annual
interest income at the Date of Deposit:
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                                                                       Normal
                                                                                                                   Distributions
Ohio Insured Trust                                       1994                                  1995                  per Year +
<S>                                     <C>            <C>            <C>            <C>            <C>            <C>
- -------------------------------------------------------------------------------------------------------------      --------------
Record Date*..........................        6/1            8/1           11/1            2/1            5/1
Distribution Date.....................       6/15           8/15          11/15           2/15           5/15
- ---------------------------------------------------------------------------------------------------------------------------------
Monthly Distribution Plan.............  $   .4388(1)                                                               $  5.2660
                                                             --------    $.4388 every month    --------
Quarterly Distribution Plan...........  $   .4388(1)   $   .8830(2)   $  1.3245      $  1.3245      $  1.3245      $  5.2980
Semi-Annual Distribution Plan.........  $   .4388(1)                  $  2.2154(3)                  $  2.6585      $  5.3170
- ---------------------------------------------------------------------------------------------------------------------------------
<FN>
  * Record Dates for semi-annual distributions are May 1 and November 1; for quarterly distributions, they are February 1, May 1,
    August 1 and November 1. Record Dates for monthly distributions are the first day of each month.
(1) The first distribution will be paid to all Unitholders, regardless of the distribution plan selected.
(2) The second distribution under the quarterly distribution plan represents a 2-month distribution; subsequent quarterly
    distributions will be regular 3-month distributions.
(3) The second distribution under the semi-annual distribution plan represents a 5-month distribution; subsequent semi-annual
    distributions will be regular 6-month distributions.
</TABLE>
 
+ Interest for Unitholders of this series began to accrue as of the Date of
Deposit. Units purchased on the Date of Deposit will have $.10 of accrued
interest that will be added to the Public Offering Price on the Settlement Date.
After provision for expenses of the Fund, the daily rate of accrual from the
Date of Deposit to the first Record Date is $.01463 per unit per day.
Consequently, on the first Record Date (06/01/94), accrued interest will total
$1.2728 per unit for the 87-day period. Because a substantial portion of this
interest will not yet be due from the issuers of the bonds in the Fund, the
first payment to all Unitholders of Record on 06/01/94 is $.4388, and the
remaining $.8340 of accrued interest will remain an asset of the Trust and be
distributed in subsequent periods as portfolio bonds mature, or are redeemed, or
sold and the accrued interest on these bonds is collected. After the first
Record Date daily rates of accrual are:
              Monthly - $0.01463              Quarterly - $0.01472
                             Semi-Annual - $0.01477
This daily rate of accrual, and the annual distributions shown above, will
remain the same as long as the portfolio size and composition remain the same.
 
- --------------------------------------------------------------------------------
 
                                                          718
<PAGE>
- -------------------------------------------------------
 
AVERAGE PORTFOLIO LIFE   The average maturity of portfolio bonds is 26.1 years.
The first bond is scheduled to mature in December, 2016, with the last bond
maturity being February, 2024.
 
- -------------------------------------------------
 
BONDS INSURED BY MBIA   Each bond in this Nuveen Insured series has been
insured* by the Municipal Bond Investors Assurance Corporation, which guarantees
timely payments of principal and interest. Premium payments have been fully paid
by the Date of Deposit.
 
- -------------------------------------------------
 
CALL PROTECTION   Bonds are first subject to optional redemption by the issuers
in the years and at the prices shown under the Redemption Provisions column in
the Schedule of Investments. Unless otherwise stated, in subsequent years, bonds
are redeemable at declining prices, but not usually below par value. Some issues
or some portions of issues may also be subject to sinking fund redemption or
extraordinary redemption without premium prior to the dates shown.
 
- -------------------------------------------------
 
NO CHARGE FOR REDEMPTION   The Trustee, United States Trust Company of New York,
will redeem units at net asset value. In addition, John Nuveen & Co.
Incorporated intends to maintain a secondary market for this Nuveen Tax-Exempt
Unit Trust. Inasmuch as all securities investments are subject to market price
fluctuation, net asset value at the time of redemption could be more or less
than the initial investment.
 
- -------------------------------------------------
 
REINVESTMENT OPTIONS   Specify automatic reinvestment of trust income, with no
sales charge, to earn compounded dividends with Nuveen mutual funds.
 
- -------------------------------------------------
 
* Insurance relates specifically to the bonds and not to the units or to the
  market value of units. Terms of the insurance are more fully described in the
  prospectus. No representation is made as to the insurer's ability to meet its
  commitments. See Section 5 of the prospectus for details.
- -------------------------------------------------------
 
FOR A PROSPECTUS CONTAINING MORE COMPLETE INFORMATION, INCLUDING CHARGES AND
EXPENSES, ON THIS NUVEEN TAX-EXEMPT UNIT TRUST AND ANY OTHER NUVEEN FUND, CALL
YOUR BROKER . . . OR NUVEEN AT
 
                                 1-800-351-4100
 
READ THE PROSPECTUS CAREFULLY BEFORE YOU INVEST OR SEND MONEY.


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