NUVEEN TAX EXEMPT UNIT TRUST SERIES 724/NEW
497, 1994-04-14
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<PAGE>
NUVEEN  Tax-Exempt Unit Trusts
     NUVEEN
     VIRGINIA
     TRUST 285
              (VIRGINIA TRADITIONAL TRUST 285)
 
            Estimated Current Return
            First
            Year: 5.68% to 5.91%
            Subsequent
            Years: 5.72% to 5.94%
            as of 04/12/94
 
            Estimated Long Term Return
            5.76% to 6.00%
             35,000 units in a
             diversified $3,500,000
             portfolio of tax-exempt
             bonds
                  Cusip:
                  6706L5 259 Monthly Payment Option
                  6706L5 267 Quarterly Payment Option
                  6706L5 275 Semi-Annual Payment Option
 
                  Registered in Virginia
                    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--VIRGINIA TRADITIONAL TRUST 285
SCHEDULE OF INVESTMENTS
DATE OF DEPOSIT APRIL 13, 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    Virginia Public School Authority, School Financing , Series        2004 at 102          AA            Aa
                  1994 A, 6.20% Due 8/1/14. (When issued.)
     500,000    Industrial Development Authority of the City of Alexandria,        2004 at 102          A+            A1
                  Virginia, Pollution Control Revenue Refunding Bonds
                  (Potomac Electric Project), 1994 Series, 5.375% Due
                  2/15/24.
     500,000    Industrial Development Authority of Covington-Alleghany            2002 at 102          A-            --
                  County, Virginia, Hospital Facility Revenue Bonds
                  (Alleghany Regional Hospital), Series 1992, 6.875% Due
                  4/1/22.
     500,000    Fairfax County Economic Development Authority (Virginia),          2004 at 102          AA            Aa
                  Lease Revenue Bonds (Government Center Properties), Series
                  1994, 5.50% Due 5/15/18. (Original issue discount bonds
                  delivered on or about March 15, 1994 at a price of 93.654%
                  of principal amount.)
     500,000    Fairfax County (Virginia), Water Authority, Water Refunding        2002 at 100          AA-           Aa
                  Revenue Bonds, Series 1992, 5.75% Due 4/1/29. (Original
                  issue discount bonds delivered on or about December 8,
                  1992 at a price of 92.25% of principal amount.)
     300,000    Industrial Development Authority of the City of                    2002 at 102          AAA           Aaa
                  Harrisonburg, Virginia, Hospital Revenue Bonds (Rockingham
                  Memorial Hospital), Series 1993, 5.75% Due 12/1/13. (MBIA
                  Insured.)
     200,000    Industrial Development Authority of the County of Prince           2003 at 102          --             A
                  William (Virginia), Hospital Revenue Refunding Bonds
                  (Prince William Hospital), Series 1993, 5.625% Due 4/1/12.
     500,000    Richmond Metropolitan Authority (Virginia), Expressway             2002 at 102          AAA           Aaa
                  Revenue and Refunding Bonds, Series 1992-B, 6.25% Due
                  7/15/22. (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>       <C>      <C>       <C>
50-499                 $5,000-$49,999   4.90 %   $    100.29     (5.68%)  5.72%     (5.71%)  5.75%     (5.73%)  5.77%
500-999                 50,000-99,999   4.75          100.14     (5.69)   5.72      (5.72)   5.76      (5.74)   5.78
1,000-2,499           100,000-249,999   4.50           99.87     (5.71)   5.74      (5.74)   5.77      (5.76)   5.79
2,500-4,999           250,000-499,999   4.25           99.61     (5.72)   5.76      (5.75)   5.79      (5.77)   5.81
5,000-9,999           500,000-999,999   3.50           98.84     (5.76)   5.80      (5.80)   5.83      (5.82)   5.85
10,000-24,999     1,000,000-2,499,999   3.00           98.33     (5.79)   5.83      (5.83)   5.86      (5.85)   5.88
25,000-49,999     2,500,000-4,999,999   2.50           97.83     (5.82)   5.86      (5.86)   5.89      (5.88)   5.91
50,000 and over    5,000,000 and over   2.00           97.33     (5.85)   5.89      (5.89)   5.92      (5.91)   5.94
</TABLE>
 
- --------------------------------------------------------------------------------
 
<TABLE>
<S>               <C>                  <C>       <C>         <C>                <C>              <C>
          AMOUNT PURCHASED
- -------------------------------------
                                                                         Estimated Long Term Return (3)
     Units                                                    -----------------------------------------------------
- ----------------
                                                   Public
                                       Sales      Offering          Monthly         Quarterly       Semi-Annual
                        Dollars        Charge     Price (1)         Payment          Payment          Payment
                  -------------------  ------    -----------     -------------    -------------    -------------
50-499                 $5,000-$49,999   4.90 %   $    100.29          5.76    %        5.80    %        5.82    %
500-999                 50,000-99,999   4.75          100.14          5.77             5.81             5.83
1,000-2,499           100,000-249,999   4.50           99.87          5.79             5.83             5.85
2,500-4,999           250,000-499,999   4.25           99.61          5.80             5.84             5.86
5,000-9,999           500,000-999,999   3.50           98.84          5.85             5.89             5.91
10,000-24,999     1,000,000-2,499,999   3.00           98.33          5.88             5.92             5.94
25,000-49,999     2,500,000-4,999,999   2.50           97.83          5.91             5.95             5.97
50,000 and over    5,000,000 and over   2.00           97.33          5.94             5.98             6.00
</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
Virginia Traditional Trust                               1994                          1995             per Year +
<S>                                     <C>            <C>            <C>            <C>            <C>
- ----------------------------------------------------------------------------------------------------  --------------
Record Date*..........................        5/1            8/1           11/1            2/1
Distribution Date.....................       5/15           8/15          11/15           2/15
- --------------------------------------------------------------------------------------------------------------------
Monthly Distribution Plan.............  $   .2865(1)                                                  $  5.7328
                                                          --------  $.4776 every month  --------
Quarterly Distribution Plan...........  $   .2865(1)   $  1.4409(2)   $  1.4409      $  1.4409        $  5.7648
Semi-Annual Distribution Plan.........  $   .2865(1)                  $  2.8908(3)                    $  5.7838
- --------------------------------------------------------------------------------------------------------------------
<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. Such distribution may
    be more or less than a regular monthly distribution.
(2) Regular 3-month distribution.
(3) Regular 6-month distribution.
</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 $.01592 per unit per day.
Consequently, on the first Record Date (05/01/94), accrued interest will total
$0.2865 per unit for the 18-day period. All interest accrued from the Date of
Deposit to the first Record Date, less expenses, will be distributed on the
first Distribution Date to Unitholders of Record as of the first Record Date.
The first payment to all Unitholders of Record on 05/01/94 is $.2865 per unit.
After the first Record Date daily rates of accrual are:
              Monthly - $0.01592              Quarterly - $0.01601
                             Semi-Annual - $0.01606
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.
 
                                                          724
<PAGE>
- --------------------------------------------------------------------------------
 
                                                          724
<PAGE>
- -------------------------------------------------------
 
AVERAGE PORTFOLIO LIFE   The average maturity of portfolio bonds is 26.3 years.
The first bond is scheduled to mature in April, 2012, with the last bond
maturity being April, 2029.
 
- -------------------------------------------------
 
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                         23%
AA                          43
A1/A+                       14
A                           20
                           ---
                           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
     CALIFORNIA
     INSURED
     TRUST 223
 
            Estimated Current Return
            5.55% to 5.78%
            as of 04/12/94
 
            Estimated Long Term Return
            5.71% to 5.93%
             35,000 units in a
             diversified $3,500,000
             portfolio of tax-exempt
             bonds rated "AAA"
                  Cusip:
                  67064U 162 Monthly Payment Option
                  67064U 170 Quarterly Payment Option
                  67064U 188 Semi-Annual Payment Option
 
                  Registered in California
                    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, CALIFORNIA INSURED TRUST 223
SCHEDULE OF INVESTMENTS
DATE OF DEPOSIT APRIL 13, 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    California Health Facilities Financing Authority, Kaiser           2003 at 102          AAA           Aaa
                  Permanente, Revenue Bonds, 1993 Series C, 5.60% Due
                  5/1/33.
     500,000    State Public Works Board of the State of California Lease          2002 at 102          AAA           Aaa
                  Revenue Bonds (Department of Corrections), 1993 Series D
                  (California State Prison-Lassen County, Susanville),
                  5.375% Due 6/1/18.
     500,000    California Statewide Communities Development Authority,            2003 at 102          AAA           Aaa
                  Insured Health Facilities Revenue Certificates of
                  Participation (UniHealth America), 1993 Series A, 5.50%
                  Due 10/1/14.
     500,000    The City of Los Angeles (California), Wastewater System            2003 at 102          AAA           Aaa
                  Revenue Bonds, Series 1993-B, 5.70% Due 6/1/23.
     500,000    Department of Water and Power of the City of Los Angeles,          2003 at 102          AAA           Aaa
                  California, Electric Plant Refunding Revenue Bonds, Issue
                  of 1993,
                250M-5.875% Due 9/1/30,
                250M-5.875% Due 9/1/30.
     500,000    County of Sacramento, California (Sacramento County Public         2003 at 102          AAA           Aaa
                  Facilities Financing Corporation), Refunding Certificates
                  of Participation (Sacramento Main Detention Facility
                  Project), 5.75% Due 6/1/15.
     500,000    City of Walnut Creek, California, Certificates of                  2004 at 102          AAA           Aaa
                  Participation, Refunding Series 1994 (John Muir Medical
                  Center), 5.00% Due 2/15/20. (Original issue discount bonds
                  delivered on or about February 17, 1994 at a price of
                  94.047% of principal amount.)
  ----------
  $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>
50-499                 $5,000-$49,999   4.90 %   $     95.79          5.55%            5.58%            5.60%
500-999                 50,000-99,999   4.75           95.64          5.56             5.59             5.61
1,000-2,499           100,000-249,999   4.50           95.39          5.57             5.61             5.63
2,500-4,999           250,000-499,999   4.25           95.14          5.59             5.62             5.64
5,000-9,999           500,000-999,999   3.50           94.40          5.63             5.67             5.69
10,000-24,999     1,000,000-2,499,999   3.00           93.92          5.66             5.70             5.72
25,000-49,999     2,500,000-4,999,999   2.50           93.44          5.69             5.73             5.75
50,000 and over    5,000,000 and over   2.00           92.96          5.72             5.75             5.78
</TABLE>
 
- --------------------------------------------------------------------------------
 
<TABLE>
<S>               <C>                  <C>       <C>         <C>                <C>              <C>
          AMOUNT PURCHASED
- -------------------------------------
                                                                         Estimated Long Term Return (3)
     Units                                                    -----------------------------------------------------
- ----------------
                                                   Public
                                       Sales      Offering          Monthly         Quarterly       Semi-Annual
                        Dollars        Charge     Price (1)         Payment          Payment          Payment
                  -------------------  ------    -----------     -------------    -------------    -------------
50-499                 $5,000-$49,999   4.90 %   $     95.79          5.71    %        5.74    %        5.75    %
500-999                 50,000-99,999   4.75           95.64          5.71             5.74             5.76
1,000-2,499           100,000-249,999   4.50           95.39          5.73             5.76             5.78
2,500-4,999           250,000-499,999   4.25           95.14          5.74             5.77             5.79
5,000-9,999           500,000-999,999   3.50           94.40          5.79             5.82             5.84
10,000-24,999     1,000,000-2,499,999   3.00           93.92          5.82             5.85             5.87
25,000-49,999     2,500,000-4,999,999   2.50           93.44          5.85             5.88             5.90
50,000 and over    5,000,000 and over   2.00           92.96          5.88             5.91             5.93
</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
California Insured Trust                                 1994                          1995             per Year +
<S>                                     <C>            <C>            <C>            <C>            <C>
- ----------------------------------------------------------------------------------------------------  --------------
Record Date*..........................        5/1            8/1           11/1            2/1
Distribution Date.....................       5/15           8/15          11/15           2/15
- --------------------------------------------------------------------------------------------------------------------
Monthly Distribution Plan.............  $   .2658(1)                                                  $  5.3177
                                                          --------  $.4431 every month  --------
Quarterly Distribution Plan...........  $   .2658(1)   $  1.3374(2)   $  1.3374      $  1.3374        $  5.3497
Semi-Annual Distribution Plan.........  $   .2658(1)                  $  2.6838(3)                    $  5.3687
- --------------------------------------------------------------------------------------------------------------------
<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. Such distribution may
    be more or less than a regular monthly distribution.
(2) Regular 3-month distribution.
(3) Regular 6-month distribution.
</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 $.01477 per unit per day.
Consequently, on the first Record Date (05/01/94), accrued interest will total
$0.2658 per unit for the 18-day period. All interest accrued from the Date of
Deposit to the first Record Date, less expenses, will be distributed on the
first Distribution Date to Unitholders of Record as of the first Record Date.
The first payment to all Unitholders of Record on 05/01/94 is $.2658 per unit.
After the first Record Date daily rates of accrual are:
              Monthly - $0.01477              Quarterly - $0.01486
                             Semi-Annual - $0.01491
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.
 
- --------------------------------------------------------------------------------
 
                                                          724
<PAGE>
- -------------------------------------------------------
 
AVERAGE PORTFOLIO LIFE   The average maturity of portfolio bonds is 28.0 years.
The first bond is scheduled to mature in October, 2014, with the last bond
maturity being May, 2033.
 
- -------------------------------------------------
 
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
     FLORIDA
     INSURED
     TRUST 188
 
            Estimated Current Return
            5.59% to 5.81%
            as of 04/12/94
 
            Estimated Long Term Return
            5.69% to 5.92%
             35,000 units in a
             diversified $3,500,000
             portfolio of tax-exempt
             bonds rated "AAA"
                  Cusip:
                  6706H3 226 Monthly Payment Option
                  6706H3 234 Quarterly Payment Option
                  6706H3 242 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 188
SCHEDULE OF INVESTMENTS
DATE OF DEPOSIT APRIL 13, 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    Dade County Health Facilities Authority (Florida), Hospital        2003 at 101          AAA           Aaa
                  Revenue Refunding Bonds, Series 1993A (Baptist Hospital of
                  Miami Project), 5.25% Due 5/15/21. (Original issue
                  discount bonds delivered on or about March 17, 1993 at a
                  price of 94.118% of principal amount.)
     500,000    Jacksonville Electric Authority (Jacksonville, Florida),           2002 at 101          AAA           Aaa
                  Bulk Power Supply System Revenue Bonds (Scherer 4 Project,
                  Refunding Issue, Series 1993 A), 5.25% Due 10/1/21.
     500,000    Orange County, Florida, Water Utilities System Revenue             2002 at 102          AAA           Aaa
                  Bonds, Series 1992, 6.25% Due 10/1/17.
     500,000    Orlando (Florida) Utilities Commission, Water and Electric         2002 at 102          AAA           Aaa
                  Subordinated Revenue Bonds, Series 1992A, 6.00% Due
                  10/1/20.
     500,000    Pinellas County (Florida), Health Facilities Authority,            2003 at 102          AAA           Aaa
                  Hospital Revenue Bonds, Series 1993 (Morton Plant Health
                  System Project), 5.625% Due 11/15/23.
     500,000    Pinellas County, Florida, Sewer Revenue Bonds, Series 1994,        2002 at 102          AAA           Aaa
                  5.875% Due 10/1/21.
     500,000    South Broward Hospital District (Florida), Hospital Revenue        2003 at 102          AAA           Aaa
                  and Refunding Revenue Bonds, Series 1993, 5.50% Due
                  5/1/22.
  ----------
  $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>
50-499                 $5,000-$49,999   4.90 %   $     97.67          5.59%            5.62%            5.64%
500-999                 50,000-99,999   4.75           97.51          5.60             5.63             5.65
1,000-2,499           100,000-249,999   4.50           97.26          5.61             5.64             5.66
2,500-4,999           250,000-499,999   4.25           97.00          5.62             5.66             5.68
5,000-9,999           500,000-999,999   3.50           96.25          5.67             5.70             5.72
10,000-24,999     1,000,000-2,499,999   3.00           95.75          5.70             5.73             5.75
25,000-49,999     2,500,000-4,999,999   2.50           95.26          5.73             5.76             5.78
50,000 and over    5,000,000 and over   2.00           94.78          5.76             5.79             5.81
</TABLE>
 
- --------------------------------------------------------------------------------
 
<TABLE>
<S>               <C>                  <C>       <C>         <C>                <C>              <C>
          AMOUNT PURCHASED
- -------------------------------------
                                                                         Estimated Long Term Return (3)
     Units                                                    -----------------------------------------------------
- ----------------
                                                   Public
                                       Sales      Offering          Monthly         Quarterly       Semi-Annual
                        Dollars        Charge     Price (1)         Payment          Payment          Payment
                  -------------------  ------    -----------     -------------    -------------    -------------
50-499                 $5,000-$49,999   4.90 %   $     97.67          5.69    %        5.73    %        5.74    %
500-999                 50,000-99,999   4.75           97.51          5.69             5.73             5.75
1,000-2,499           100,000-249,999   4.50           97.26          5.71             5.75             5.77
2,500-4,999           250,000-499,999   4.25           97.00          5.72             5.76             5.78
5,000-9,999           500,000-999,999   3.50           96.25          5.77             5.81             5.83
10,000-24,999     1,000,000-2,499,999   3.00           95.75          5.80             5.84             5.86
25,000-49,999     2,500,000-4,999,999   2.50           95.26          5.83             5.87             5.89
50,000 and over    5,000,000 and over   2.00           94.78          5.86             5.90             5.92
</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
Florida Insured Trust                                    1994                          1995             per Year +
<S>                                     <C>            <C>            <C>            <C>            <C>
- ----------------------------------------------------------------------------------------------------  --------------
Record Date*..........................        5/1            8/1           11/1            2/1
Distribution Date.....................       5/15           8/15          11/15           2/15
- --------------------------------------------------------------------------------------------------------------------
Monthly Distribution Plan.............  $   .2727(1)                                                  $  5.4560
                                                          --------  $.4545 every month  --------
Quarterly Distribution Plan...........  $   .2727(1)   $  1.3716(2)   $  1.3716      $  1.3716        $  5.4880
Semi-Annual Distribution Plan.........  $   .2727(1)                  $  2.7522(3)                    $  5.5070
- --------------------------------------------------------------------------------------------------------------------
<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. Such distribution may
    be more or less than a regular monthly distribution.
(2) Regular 3-month distribution.
(3) Regular 6-month distribution.
</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 $.01515 per unit per day.
Consequently, on the first Record Date (05/01/94), accrued interest will total
$0.2727 per unit for the 18-day period. All interest accrued from the Date of
Deposit to the first Record Date, less expenses, will be distributed on the
first Distribution Date to Unitholders of Record as of the first Record Date.
The first payment to all Unitholders of Record on 05/01/94 is $.2727 per unit.
After the first Record Date daily rates of accrual are:
              Monthly - $0.01515              Quarterly - $0.01524
                             Semi-Annual - $0.01529
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.
 
- --------------------------------------------------------------------------------
 
                                                          724
<PAGE>
- -------------------------------------------------------
 
AVERAGE PORTFOLIO LIFE   The average maturity of portfolio bonds is 27.1 years.
The first bond is scheduled to mature in October, 2017, with the last bond
maturity being November, 2023.
 
- -------------------------------------------------
 
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
     MASSACHUSETTS
     INSURED
     TRUST 112
 
            Estimated Current Return
            5.69% to 5.92%
            as of 04/12/94
 
            Estimated Long Term Return
            5.73% to 5.95%
             35,000 units in a
             diversified $3,500,000
             portfolio of tax-exempt
             bonds rated "AAA"
                  Cusip:
                  670946 730 Monthly Payment Option
                  670946 748 Quarterly Payment Option
                  670946 755 Semi-Annual Payment Option
 
                  Registered in Massachusetts
                    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, MASSACHUSETTS INSURED TRUST 112
SCHEDULE OF INVESTMENTS
DATE OF DEPOSIT APRIL 13, 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    Massachusetts Bay Transportation Authority, General                2003 at 102          AAA           Aaa
                  Transportation System Bonds, 1993 Series A Refunding,
                  5.50% Due 3/1/22. (General Obligation Bonds.)
     500,000    Massachusetts Health and Educational Facilities Authority,         2004 at 102          AAA           Aaa
                  Revenue Bonds, New England Medical Center Hospitals Issue,
                  Series G-1, 5.375% Due 7/1/24.
     500,000    Massachusetts Health and Educational Facilities Authority,         2002 at 102          AAA           Aaa
                  Revenue Bonds, Northeastern University Issue, Series E,
                  6.55% Due 10/1/22.
     500,000    Massachusetts Health and Educational Facilities Authority,         2004 at 102          AAA           Aaa
                  Revenue Bonds, Smith College Issue, Series D, 5.75% Due
                  7/1/16.
     500,000    Massachusetts Health and Educational Facilities Authority,         2002 at 102          AAA           Aaa
                  Revenue Bonds, South Shore Hospital Issue, Series D, 6.50%
                  Due 7/1/22.
     500,000    Massachusetts Municipal Wholesale Electric Company, A Public       2002 at 102          AAA           Aaa
                  Corporation of the Commonwealth of Massachusetts Power
                  Supply System Revenue Bonds, 1992 Series E, 6.125% Due
                  7/1/19.
     500,000    City of Springfield, Massachusetts, General Obligation             2003 at 102          AAA           Aaa
                  Municpal Purpose Loan of 1993 Bonds, Series B, 6.00% Due
                  1/15/13.
  ----------
  $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>
50-499                 $5,000-$49,999   4.90 %   $    100.97          5.69%            5.73%            5.74%
500-999                 50,000-99,999   4.75          100.81          5.70             5.73             5.75
1,000-2,499           100,000-249,999   4.50          100.54          5.72             5.75             5.77
2,500-4,999           250,000-499,999   4.25          100.28          5.73             5.76             5.78
5,000-9,999           500,000-999,999   3.50           99.50          5.78             5.81             5.83
10,000-24,999     1,000,000-2,499,999   3.00           98.99          5.81             5.84             5.86
25,000-49,999     2,500,000-4,999,999   2.50           98.48          5.84             5.87             5.89
50,000 and over    5,000,000 and over   2.00           97.98          5.87             5.90             5.92
</TABLE>
 
- --------------------------------------------------------------------------------
 
<TABLE>
<S>               <C>                  <C>       <C>         <C>                <C>              <C>
          AMOUNT PURCHASED
- -------------------------------------
                                                                         Estimated Long Term Return (3)
     Units                                                    -----------------------------------------------------
- ----------------
                                                   Public
                                       Sales      Offering          Monthly         Quarterly       Semi-Annual
                        Dollars        Charge     Price (1)         Payment          Payment          Payment
                  -------------------  ------    -----------     -------------    -------------    -------------
50-499                 $5,000-$49,999   4.90 %   $    100.97          5.73    %        5.75    %        5.77    %
500-999                 50,000-99,999   4.75          100.81          5.73             5.76             5.78
1,000-2,499           100,000-249,999   4.50          100.54          5.75             5.78             5.80
2,500-4,999           250,000-499,999   4.25          100.28          5.76             5.79             5.81
5,000-9,999           500,000-999,999   3.50           99.50          5.81             5.84             5.86
10,000-24,999     1,000,000-2,499,999   3.00           98.99          5.84             5.87             5.89
25,000-49,999     2,500,000-4,999,999   2.50           98.48          5.87             5.90             5.92
50,000 and over    5,000,000 and over   2.00           97.98          5.90             5.93             5.95
</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
Massachusetts Insured Trust                              1994                          1995             per Year +
<S>                                     <C>            <C>            <C>            <C>            <C>
- ----------------------------------------------------------------------------------------------------  --------------
Record Date*..........................        5/1            8/1           11/1            2/1
Distribution Date.....................       5/15           8/15          11/15           2/15
- --------------------------------------------------------------------------------------------------------------------
Monthly Distribution Plan.............  $   .2872(1)                                                  $  5.7486
                                                          --------  $.4788 every month  --------
Quarterly Distribution Plan...........  $   .2872(1)   $  1.4445(2)   $  1.4445      $  1.4445        $  5.7806
Semi-Annual Distribution Plan.........  $   .2872(1)                  $  2.8998(3)                    $  5.7996
- --------------------------------------------------------------------------------------------------------------------
<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. Such distribution may
    be more or less than a regular monthly distribution.
(2) Regular 3-month distribution.
(3) Regular 6-month distribution.
</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 $.01596 per unit per day.
Consequently, on the first Record Date (05/01/94), accrued interest will total
$0.2872 per unit for the 18-day period. All interest accrued from the Date of
Deposit to the first Record Date, less expenses, will be distributed on the
first Distribution Date to Unitholders of Record as of the first Record Date.
The first payment to all Unitholders of Record on 05/01/94 is $.2872 per unit.
After the first Record Date daily rates of accrual are:
              Monthly - $0.01596              Quarterly - $0.01605
                             Semi-Annual - $0.01611
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.
 
- --------------------------------------------------------------------------------
 
                                                          724
<PAGE>
- -------------------------------------------------------
 
AVERAGE PORTFOLIO LIFE   The average maturity of portfolio bonds is 25.9 years.
The first bond is scheduled to mature in January, 2013, with the last bond
maturity being July, 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
     NEW YORK
     INSURED
     TRUST 215
 
            Estimated Current Return
            5.58% to 5.80%
            as of 04/12/94
 
            Estimated Long Term Return
            5.62% to 5.84%
             35,000 units in a
             diversified $3,500,000
             portfolio of tax-exempt
             bonds rated "AAA"
                  Cusip:
                  6706H5 528 Monthly Payment Option
                  6706H5 536 Quarterly Payment Option
                  6706H5 544 Semi-Annual Payment Option
 
                  Registered in New York, Connecticut & 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, NEW YORK INSURED TRUST 215
SCHEDULE OF INVESTMENTS
DATE OF DEPOSIT APRIL 13, 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    Dormitory Authority of the State of New York, State                No Optional          AAA           Aaa
                  University Educational Facilities Revenue Bonds, Series             Call
                  1993A, 5.875% Due 5/15/11.
     500,000    Dormitory Authority of the State of New York, Revenue Bonds,       2004 at 102          AAA           Aaa
                  Upstate Community Colleges, Series 1994A, 5.70% Due
                  7/1/21.
     165,000    New York Local Government Assistance Corporation (A Public         2003 at 102          AAA           Aaa
                  Benefit Corporation of the State of New York), Series
                  1993C Refunding Bonds, 5.50% Due 4/1/18.
     335,000    New York Local Government Assistance Corporation (A Public         2004 at 101          AAA           Aaa
                  Benefit Corporation of the State of New York), Series                1/2
                  1994A Bonds, 5.50% Due 4/1/23.
     500,000    New York State Medical Care Facilities Finance Agency,             2004 at 102          AAA           Aaa
                  Mental Health Services Facilities Improvement Revenue
                  Bonds, 1994 Series A, 5.25% Due 8/15/23. (Original issue
                  discount bonds delivered on or about February 24, 1994 at
                  a price of 92.804% of principal amount.)(General
                  Obligation Bonds.)
     500,000    The City of New York (New York), General Obligation Bonds,         2002 at 101          AAA           Aaa
                  Fiscal 1993 Series B, 7.00% Due 10/1/09.                             1/2
     500,000    Metropolitan Transportation Authority (New York), Transit          2003 at 101          AAA           Aaa
                  Facilities Service Contract Bonds, Series P, 5.75% Due               1/2
                  7/1/15.
     500,000    New York City (New York), Municipal Water Finance Authority,       2004 at 101          AAA           Aaa
                  Water and Sewer System Revenue Bonds, Fixed Rate Fiscal
                  1994 Series B, 5.50% Due 6/15/19.
  ----------
  $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>
50-499                 $5,000-$49,999   4.90 %   $     99.87          5.58%            5.61%            5.63%
500-999                 50,000-99,999   4.75           99.72          5.59             5.62             5.64
1,000-2,499           100,000-249,999   4.50           99.46          5.60             5.64             5.66
2,500-4,999           250,000-499,999   4.25           99.20          5.62             5.65             5.67
5,000-9,999           500,000-999,999   3.50           98.42          5.66             5.70             5.71
10,000-24,999     1,000,000-2,499,999   3.00           97.92          5.69             5.72             5.74
25,000-49,999     2,500,000-4,999,999   2.50           97.42          5.72             5.75             5.77
50,000 and over    5,000,000 and over   2.00           96.92          5.75             5.78             5.80
</TABLE>
 
- --------------------------------------------------------------------------------
 
<TABLE>
<S>               <C>                  <C>       <C>         <C>                <C>              <C>
          AMOUNT PURCHASED
- -------------------------------------
                                                                         Estimated Long Term Return (3)
     Units                                                    -----------------------------------------------------
- ----------------
                                                   Public
                                       Sales      Offering          Monthly         Quarterly       Semi-Annual
                        Dollars        Charge     Price (1)         Payment          Payment          Payment
                  -------------------  ------    -----------     -------------    -------------    -------------
50-499                 $5,000-$49,999   4.90 %   $     99.87          5.62    %        5.65    %        5.67    %
500-999                 50,000-99,999   4.75           99.72          5.63             5.66             5.67
1,000-2,499           100,000-249,999   4.50           99.46          5.64             5.67             5.69
2,500-4,999           250,000-499,999   4.25           99.20          5.66             5.69             5.70
5,000-9,999           500,000-999,999   3.50           98.42          5.70             5.73             5.75
10,000-24,999     1,000,000-2,499,999   3.00           97.92          5.73             5.76             5.78
25,000-49,999     2,500,000-4,999,999   2.50           97.42          5.76             5.79             5.81
50,000 and over    5,000,000 and over   2.00           96.92          5.79             5.82             5.84
</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
New York Insured Trust                                   1994                          1995             per Year +
<S>                                     <C>            <C>            <C>            <C>            <C>
- ----------------------------------------------------------------------------------------------------  --------------
Record Date*..........................        5/1            8/1           11/1            2/1
Distribution Date.....................       5/15           8/15          11/15           2/15
- --------------------------------------------------------------------------------------------------------------------
Monthly Distribution Plan.............  $   .2786(1)                                                  $  5.5736
                                                          --------  $.4644 every month  --------
Quarterly Distribution Plan...........  $   .2786(1)   $  1.4013(2)   $  1.4013      $  1.4013        $  5.6056
Semi-Annual Distribution Plan.........  $   .2786(1)                  $  2.8116(3)                    $  5.6246
- --------------------------------------------------------------------------------------------------------------------
<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. Such distribution may
    be more or less than a regular monthly distribution.
(2) Regular 3-month distribution.
(3) Regular 6-month distribution.
</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 $.01548 per unit per day.
Consequently, on the first Record Date (05/01/94), accrued interest will total
$0.2786 per unit for the 18-day period. All interest accrued from the Date of
Deposit to the first Record Date, less expenses, will be distributed on the
first Distribution Date to Unitholders of Record as of the first Record Date.
The first payment to all Unitholders of Record on 05/01/94 is $.2786 per unit.
After the first Record Date daily rates of accrual are:
              Monthly - $0.01548              Quarterly - $0.01557
                             Semi-Annual - $0.01562
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.
 
- --------------------------------------------------------------------------------
 
                                                          724
<PAGE>
- -------------------------------------------------------
 
AVERAGE PORTFOLIO LIFE   The average maturity of portfolio bonds is 23.3 years.
The first bond is scheduled to mature in October, 2009, with the last bond
maturity being August, 2023.
 
- -------------------------------------------------
 
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 113
 
            Estimated Current Return
            5.56% to 5.78%
            as of 04/12/94
 
            Estimated Long Term Return
            5.65% to 5.88%
             35,000 units in a
             diversified $3,500,000
             portfolio of tax-exempt
             bonds rated "AAA"
                  Cusip:
                  67101Y 342 Monthly Payment Option
                  67101Y 359 Quarterly Payment Option
                  67101Y 367 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 113
SCHEDULE OF INVESTMENTS
DATE OF DEPOSIT APRIL 13, 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.
     500,000    Ohio Water Development Authority, Water Development Revenue        2002 at 102          AAA           Aaa
                  Refunding Bonds, Pure Water Refunding and Improvement
                  Series, 5.50% Due 12/1/18. (Original issue discount bonds
                  delivered on or about October 14, 1992 at a price of
                  89.804% of principal amount.)
     500,000    County of Cuyahoga, Ohio, Hospital Facilities Revenue Bonds,       2003 at 102          AAA           Aaa
                  Series 1993, Health Cleveland, Inc. (Fairview General
                  Hospital Project), 6.30% Due 8/15/15.
     500,000    County of Lucas, Ohio, Hospital Refunding Revenue Bonds,           2003 at 102          AAA           Aaa
                  Series 1993B (St. Vincent Medical Center), 5.375% Due
                  8/15/17.
     500,000    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    City of Newark, Ohio, Water System Improvement Bonds               2003 at 102          AAA           Aaa
                  (Limited Tax General Obligation), 6.00% Due 12/1/18.
     500,000    Commonwealth of Puerto Rico, Public Improvement Refunding          2002 at 101          AAA           Aaa
                  Bonds, Series 1992A (General Obligation Bonds.), 6.25% Due           1/2
                  7/1/10.
  ----------
  $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>
50-499                 $5,000-$49,999   4.90 %   $     98.57          5.56%            5.59%            5.61%
500-999                 50,000-99,999   4.75           98.41          5.57             5.60             5.62
1,000-2,499           100,000-249,999   4.50           98.16          5.58             5.62             5.64
2,500-4,999           250,000-499,999   4.25           97.90          5.60             5.63             5.65
5,000-9,999           500,000-999,999   3.50           97.14          5.64             5.68             5.69
10,000-24,999     1,000,000-2,499,999   3.00           96.64          5.67             5.70             5.72
25,000-49,999     2,500,000-4,999,999   2.50           96.14          5.70             5.73             5.75
50,000 and over    5,000,000 and over   2.00           95.65          5.73             5.76             5.78
</TABLE>
 
- --------------------------------------------------------------------------------
 
<TABLE>
<S>               <C>                  <C>       <C>         <C>                <C>              <C>
          AMOUNT PURCHASED
- -------------------------------------
                                                                         Estimated Long Term Return (3)
     Units                                                    -----------------------------------------------------
- ----------------
                                                   Public
                                       Sales      Offering          Monthly         Quarterly       Semi-Annual
                        Dollars        Charge     Price (1)         Payment          Payment          Payment
                  -------------------  ------    -----------     -------------    -------------    -------------
50-499                 $5,000-$49,999   4.90 %   $     98.57          5.65    %        5.69    %        5.71    %
500-999                 50,000-99,999   4.75           98.41          5.66             5.69             5.71
1,000-2,499           100,000-249,999   4.50           98.16          5.67             5.71             5.73
2,500-4,999           250,000-499,999   4.25           97.90          5.69             5.72             5.74
5,000-9,999           500,000-999,999   3.50           97.14          5.73             5.77             5.79
10,000-24,999     1,000,000-2,499,999   3.00           96.64          5.76             5.80             5.82
25,000-49,999     2,500,000-4,999,999   2.50           96.14          5.79             5.83             5.85
50,000 and over    5,000,000 and over   2.00           95.65          5.82             5.86             5.88
</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>
- ----------------------------------------------------------------------------------------------------  --------------
Record Date*..........................        5/1            8/1           11/1            2/1
Distribution Date.....................       5/15           8/15          11/15           2/15
- --------------------------------------------------------------------------------------------------------------------
Monthly Distribution Plan.............  $   .2739(1)                                                  $  5.4811
                                                          --------  $.4566 every month  --------
Quarterly Distribution Plan...........  $   .2739(1)   $  1.3779(2)   $  1.3779      $  1.3779        $  5.5131
Semi-Annual Distribution Plan.........  $   .2739(1)                  $  2.7648(3)                    $  5.5321
- --------------------------------------------------------------------------------------------------------------------
<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. Such distribution may
    be more or less than a regular monthly distribution.
(2) Regular 3-month distribution.
(3) Regular 6-month distribution.
</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 $.01522 per unit per day.
Consequently, on the first Record Date (05/01/94), accrued interest will total
$0.2739 per unit for the 18-day period. All interest accrued from the Date of
Deposit to the first Record Date, less expenses, will be distributed on the
first Distribution Date to Unitholders of Record as of the first Record Date.
The first payment to all Unitholders of Record on 05/01/94 is $.2739 per unit.
After the first Record Date daily rates of accrual are:
              Monthly - $0.01522              Quarterly - $0.01531
                             Semi-Annual - $0.01536
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.
 
- --------------------------------------------------------------------------------
 
                                                          724
<PAGE>
- -------------------------------------------------------
 
AVERAGE PORTFOLIO LIFE   The average maturity of portfolio bonds is 24.1 years.
The first bond is scheduled to mature in July, 2010, with the last bond maturity
being January, 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
     PENNSYLVANIA
     INSURED
     TRUST 178
 
            Estimated Current Return
            5.61% to 5.83%
            as of 04/12/94
 
            Estimated Long Term Return
            5.69% to 5.91%
             35,000 units in a
             diversified $3,500,000
             portfolio of tax-exempt
             bonds rated "AAA"
                  Cusip:
                  6706H9 348 Monthly Payment Option
                  6706H9 355 Quarterly Payment Option
                  6706H9 363 Semi-Annual Payment Option
 
                  Registered in Pennsylvania & 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, PENNSYLVANIA INSURED TRUST 178
SCHEDULE OF INVESTMENTS
DATE OF DEPOSIT APRIL 13, 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    Allegheny County Hospital Development Authority                    2002 at 100          AAA           Aaa
                  (Pennsylvania), Health Center Revenue Bonds, Series 1992A
                  (Presbyterian University Health System, Inc. Project),
                  6.25% Due 11/1/23.
     500,000    Bucks County Community College Authority, Bucks County,            2002 at 100          AAA           Aaa
                  Pennsylvania, College Building Revenue and Refunding
                  Bonds, Series of 1992, 6.25% Due 6/15/14. (General
                  Obligation Bonds.)
     500,000    Delaware County Authority (Commonwealth of Pennsylvania),          2002 at 102          AAA           Aaa
                  University Revenue Bonds, Series of 1992 (Villanova
                  University), 6.00% Due 8/1/12.
     500,000    Lehigh County Industrial Development Authority, Pollution          2004 at 102          AAA           Aaa
                  Control Revenue Refunding Bonds, 1994 Series A
                  (Pennsylvania Power & Light Company Project), 5.50% Due
                  2/15/27.
     500,000    Lehigh-Northampton Airport Authority (Pennsylvania), Airport       2004 at 102          AAA           Aaa
                  Revenue Bonds, Series 1993B (Allentown-Bethlehem-Easton
                  International Airport), 5.50% Due 1/1/18.
     500,000    Oil City Area School District, Venango County, Pennsylvania,       2004 at 100          AAA           Aaa
                  General Obligation Bonds, Series B of 1994, 5.45% Due
                  5/15/18.
     500,000    City of Pittsburgh (Commonwealth of Pennsylvania), General         2002 at 102          AAA           Aaa
                  Obligation Bonds, Series of 1992D, 6.125% Due 9/1/17.
  ----------
  $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>
50-499                 $5,000-$49,999   4.90 %   $    100.71          5.61%            5.64%            5.66%
500-999                 50,000-99,999   4.75          100.56          5.61             5.65             5.67
1,000-2,499           100,000-249,999   4.50          100.29          5.63             5.66             5.68
2,500-4,999           250,000-499,999   4.25          100.03          5.64             5.68             5.70
5,000-9,999           500,000-999,999   3.50           99.25          5.69             5.72             5.74
10,000-24,999     1,000,000-2,499,999   3.00           98.74          5.72             5.75             5.77
25,000-49,999     2,500,000-4,999,999   2.50           98.24          5.75             5.78             5.80
50,000 and over    5,000,000 and over   2.00           97.73          5.78             5.81             5.83
</TABLE>
 
- --------------------------------------------------------------------------------
 
<TABLE>
<S>               <C>                  <C>       <C>         <C>                <C>              <C>
          AMOUNT PURCHASED
- -------------------------------------
                                                                         Estimated Long Term Return (3)
     Units                                                    -----------------------------------------------------
- ----------------
                                                   Public
                                       Sales      Offering          Monthly         Quarterly       Semi-Annual
                        Dollars        Charge     Price (1)         Payment          Payment          Payment
                  -------------------  ------    -----------     -------------    -------------    -------------
50-499                 $5,000-$49,999   4.90 %   $    100.71          5.69    %        5.72    %        5.74    %
500-999                 50,000-99,999   4.75          100.56          5.69             5.72             5.74
1,000-2,499           100,000-249,999   4.50          100.29          5.71             5.74             5.76
2,500-4,999           250,000-499,999   4.25          100.03          5.72             5.75             5.77
5,000-9,999           500,000-999,999   3.50           99.25          5.77             5.80             5.82
10,000-24,999     1,000,000-2,499,999   3.00           98.74          5.80             5.83             5.85
25,000-49,999     2,500,000-4,999,999   2.50           98.24          5.83             5.86             5.88
50,000 and over    5,000,000 and over   2.00           97.73          5.86             5.89             5.91
</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
Pennsylvania Insured Trust                               1994                          1995             per Year +
<S>                                     <C>            <C>            <C>            <C>            <C>
- ----------------------------------------------------------------------------------------------------  --------------
Record Date*..........................        5/1            8/1           11/1            2/1
Distribution Date.....................       5/15           8/15          11/15           2/15
- --------------------------------------------------------------------------------------------------------------------
Monthly Distribution Plan.............  $   .2822(1)                                                  $  5.6458
                                                          --------  $.4704 every month  --------
Quarterly Distribution Plan...........  $   .2822(1)   $  1.4193(2)   $  1.4193      $  1.4193        $  5.6778
Semi-Annual Distribution Plan.........  $   .2822(1)                  $  2.8476(3)                    $  5.6968
- --------------------------------------------------------------------------------------------------------------------
<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. Such distribution may
    be more or less than a regular monthly distribution.
(2) Regular 3-month distribution.
(3) Regular 6-month distribution.
</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 $.01568 per unit per day.
Consequently, on the first Record Date (05/01/94), accrued interest will total
$0.2822 per unit for the 18-day period. All interest accrued from the Date of
Deposit to the first Record Date, less expenses, will be distributed on the
first Distribution Date to Unitholders of Record as of the first Record Date.
The first payment to all Unitholders of Record on 05/01/94 is $.2822 per unit.
After the first Record Date daily rates of accrual are:
              Monthly - $0.01568              Quarterly - $0.01577
                             Semi-Annual - $0.01582
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.
 
- --------------------------------------------------------------------------------
 
                                                          724
<PAGE>
- -------------------------------------------------------
 
AVERAGE PORTFOLIO LIFE   The average maturity of portfolio bonds is 24.6 years.
The first bond is scheduled to mature in August, 2012, with the last bond
maturity being February, 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.
 
- -------------------------------------------------
 
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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