DEAN WITTER NEW YORK MUNICIPAL MONEY MARKET TRUST
497, 1995-03-01
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<PAGE>
              PROSPECTUS
FEBRUARY 24, 1995

              Dean Witter New York Municipal Money Market Trust (the "Fund") is
a no-load, open-end, non-diversified management investment company whose
investment objective is to provide as high a level of daily income exempt from
federal and New York income tax as is consistent with stability of principal and
liquidity. The Fund has a Rule 12b-1 Plan of Distribution (see below). The Fund
seeks to achieve its objective by investing primarily in high quality New York
tax-exempt securities with short-term maturities, including Municipal Bonds,
Municipal Notes and Municipal Commercial Paper. (See "Investment Objective and
Policies.")

               AN INVESTMENT IN THE FUND IS NEITHER INSURED NOR GUARANTEED BY
THE U.S. GOVERNMENT. THERE IS NO ASSURANCE THAT THE FUND WILL BE ABLE TO
MAINTAIN A STABLE NET ASSET VALUE OF $1.00 PER SHARE.

               In accordance with a Plan of Distribution with Dean Witter
Distributors Inc. pursuant to Rule 12b-1 under the Investment Company Act of
1940, the Fund is authorized to reimburse specific expenses incurred in
promoting the distribution of the Fund's shares. Reimbursement may in no event
exceed an amount equal to payments at the annual rate of 0.15% of the average
daily net assets of the Fund.

               This Prospectus sets forth concisely the information you should
know before investing in the Fund. It should be read and retained for future
reference. Additional information about the Fund is contained in the Statement
of Additional Information, dated February 24, 1995, which has been filed with
the Securities and Exchange Commission, and which is available at no charge upon
request of the Fund at its address or at one of its telephone numbers listed on
this page. The Statement of Additional Information is incorporated herein by
reference.

<TABLE>
<S>                                  <C>
Minimum initial investment.........  $5,000
Minimum additional investment......  $ 100
</TABLE>

For information on opening an account, registration of shares, and other
information relating to a specific account, call Dean Witter Trust Company at
800-526-3143 (toll-free).

     DEAN WITTER DISTRIBUTORS INC.
      DISTRIBUTOR

      TABLE OF CONTENTS

Prospectus Summary/2
Summary of Fund Expenses/3
Financial Highlights/4
The Fund and its Management/4
Investment Objective and Policies/5
  Special Considerations Relating to New York
  Tax-Exempt Securities/8
Investment Restrictions/10
Purchase of Fund Shares/10
Shareholder Services/12
Redemption and Repurchase of Fund Shares/15
Dividends, Distributions and Taxes/17
Additional Information/19
Financial Statements--December 31, 1994/21
Report of Independent Accountants/26

For information about the Fund, call:

- - 800-869-FUND (toll-free)
- - In New York State at 212-392-2550
- - For dividend information only
 (when calling from outside New
 York State) 800-869-RATE (toll-free)

SHARES OF THE FUND ARE NOT DEPOSITS OR OBLIGATIONS OF, OR GUARANTEED OR ENDORSED
BY, ANY BANK, AND THE SHARES ARE NOT FEDERALLY INSURED BY THE FEDERAL DEPOSIT
INSURANCE CORPORATION, FEDERAL RESERVE BOARD, OR ANY OTHER AGENCY.

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

    Dean Witter
    New York Municipal Money Market Trust
    Two World Trade Center
    New York, New York 10048
    (212) 392-2550
<PAGE>
PROSPECTUS SUMMARY
- --------------------------------------------------------------------------------

   
<TABLE>
<S>                 <C>
The                 The Fund is organized as a Trust, commonly known as a Massachusetts business trust, and is an open-end,
Fund                non-diversified management investment company investing principally in short-term securities which are exempt
                    from federal and New York income tax.
- ------------------------------------------------------------------------------------------------------------------------------------
Shares Offered      Shares of beneficial interest with $0.01 par value. (see p. 19).
- ------------------------------------------------------------------------------------------------------------------------------------
Purchase of Shares  Investments may be made:
                    - By wire
                    - By mail
                    - Through Dean Witter Reynolds Inc. account executives or other Selected Broker-Dealers
                    Purchases are at net asset value, without a sales charge. Minimum initial investment: $5,000. Subsequent
                    investments: $100 or more (by wire or by mail); $1,000 or more (through account executives) or $100 to $5,000
                    (by EasyInvest-TM-). Orders for purchase of shares are effective on day of receipt of payment in Federal funds
                    if payment is received by the Fund's transfer agent before 12:00 noon New York time (see p. 10).
- ------------------------------------------------------------------------------------------------------------------------------------
Investment          To provide as high a level of daily income exempt from federal and New York income tax as is consistent with
Objective           stability of principal and liquidity (see p. 5).
- ------------------------------------------------------------------------------------------------------------------------------------
Investment          A portfolio of New York tax-exempt fixed-income securities with short-term maturities (see p. 5).
Policy
- ------------------------------------------------------------------------------------------------------------------------------------
Investment          Dean Witter InterCapital Inc. ("InterCapital"), the Investment Manager of the Fund and its wholly-owned
Manager             subsidiary, Dean Witter Services Company Inc., serve in various investment management, advisory, management and
                    administrative capacities to ninety-one investment companies and other portfolios with assets of approximately
                    $66.9 billion at December 31, 1994 (see page 4). The monthly fee is at an annual rate of 1/2 of 1% of average
                    daily net assets, scaled down on assets over $500 million (see p. 4-5).
- ------------------------------------------------------------------------------------------------------------------------------------
Distributor and     Dean Witter Distributors Inc. (the "Distributor") is the Fund's Distributor. The Fund is authorized to reimburse
Plan of             specific expenses incurred in promoting the distribution of the Fund's shares pursuant to a Plan of Distribution
Distribution        pursuant to Rule 12b-1 under the Investment Company Act of 1940. Reimbursement may in no event exceed an amount
                    equal to payments at the annual rate of .15 of 1% of average daily net assets of the Fund (see p. 12).
- ------------------------------------------------------------------------------------------------------------------------------------
Management          The monthly fee is at an annual rate of 1/2 of 1% of average daily net assets, scaled down on assets over $500
Fee                 million (see p. 4).
- ------------------------------------------------------------------------------------------------------------------------------------
Dividends           Declared and automatically reinvested daily in additional shares; cash payments of dividends available monthly
                    (see p. 17).
- ------------------------------------------------------------------------------------------------------------------------------------
Reports             Individual periodic account statements; annual and semi-annual Fund financial statements.
- ------------------------------------------------------------------------------------------------------------------------------------
Redemption of       Shares are redeemable by the shareholder at net asset value without any charge (see p. 15):
Shares              - By check
                    - By telephone or wire instructions, with proceeds wired or mailed to a predesignated bank account
                    - By mail
                    - Via an automatic redemption procedure (see p. 17)
                    A shareholder's account is subject to possible involuntary redemption if its value falls below $1,000 (see p.
                    17).
- ------------------------------------------------------------------------------------------------------------------------------------
Risks               The Fund invests principally in short-term fixed income securities issued or guaranteed by the State of New York
                    and its local governments which are subject to minimal risk of loss of income and principal. However, the
                    investor is directed to the discussions concerning "variable rate obligations" and "when-issued and delayed
                    delivery securities" on page 8 of the Prospectus and on page 15 of the Statement of Additional Information and
                    the discussions concerning "repurchase agreements" and "puts" on pages 16-17 of the Statement of Additional
                    Information, concerning any risks associated with such portfolio securities and management techniques. Since the
                    Fund concentrates its investments in New York tax-exempt securities, the Fund is affected by any political,
                    economic or regulatory developments affecting the ability of New York issuers to pay interest or repay principal
                    (see pages 20-27 of the Statement of Additional Information).
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
    

  THE ABOVE IS QUALIFIED IN ITS ENTIRETY BY THE DETAILED INFORMATION APPEARING
                                   ELSEWHERE
       IN THE PROSPECTUS AND IN THE STATEMENT OF ADDITIONAL INFORMATION.

                                       2
<PAGE>
SUMMARY OF FUND EXPENSES
- --------------------------------------------------------------------------------

    The  following table illustrates all expenses and fees that a shareholder of
the Fund will incur. Expenses and fees set  forth in the table are for the  year
ended December 31, 1994.

<TABLE>
<CAPTION>
SHAREHOLDER TRANSACTION EXPENSES
- ---------------------------------------------------------------------------------------
<S>                                                                                      <C>
Maximum Sales Charge Imposed on Purchases..............................................  None
Maximum Sales Charge Imposed on Reinvested Dividends...................................  None
Deferred Sales Charge..................................................................  None
Redemption Fees........................................................................  None
Exchange Fee...........................................................................  None
</TABLE>

<TABLE>
<S>                                                                                     <C>
ANNUAL FUND OPERATING EXPENSES (AS A PERCENTAGE OF AVERAGE NET ASSETS)
- --------------------------------------------------------------------------------------
Management Fees.......................................................................      0.50%
12b-1 Fees............................................................................      0.10%
Other Expenses........................................................................      0.43%
Total Fund Operating Expenses.........................................................      1.03%
</TABLE>

<TABLE>
<CAPTION>
EXAMPLE                                                                   1 year       3 years      5 years     10 years
- ----------------------------------------------------------------------  -----------  -----------  -----------  -----------
<S>                                                                     <C>          <C>          <C>          <C>
You  would pay the following expenses on a $1,000 investment, assuming
 (1) 5%  annual return  and (2)  redemption at  the end  of each  time
 period:..............................................................   $      11    $      33    $      57    $     126
</TABLE>

    THE  ABOVE  EXAMPLE SHOULD  NOT BE  CONSIDERED A  REPRESENTATION OF  PAST OR
FUTURE EXPENSES OR PERFORMANCE.  ACTUAL EXPENSES OF THE  FUND MAY BE GREATER  OR
LESS THAN THOSE SHOWN.

    The  purpose of this  table is to  assist the investor  in understanding the
various costs and expenses that  an investor in the  Fund will bear directly  or
indirectly.  For a  more complete description  of these costs  and expenses, see
"The Fund and Its Management,"  "Purchase of Fund Shares--Plan of  Distribution"
in this Prospectus.

                                       3
<PAGE>
FINANCIAL HIGHLIGHTS
- --------------------------------------------------------------------------------

    The  following ratios and per share data  for a share of beneficial interest
outstanding throughout each period  have been audited  by Price Waterhouse  LLP,
independent  accountants. The financial highlights should be read in conjunction
with the  financial statements,  notes  thereto and  the unqualified  report  of
independent  accountants which  are contained  in this  Prospectus commencing on
page 21.

<TABLE>
<CAPTION>
                                                                         FOR THE
                                                                         PERIOD
                                                                        MARCH 20,
                                                                          1990*
                                FOR THE YEAR ENDED DECEMBER 31,          THROUGH
                            ---------------------------------------   DECEMBER 31,
                             1994       1993       1992      1991         1990
                            -------    -------    -------   -------   -------------
<S>                         <C>        <C>        <C>       <C>       <C>
PER SHARE OPERATING
  PERFORMANCE:
Net asset value,
  beginning of period....   $  1.00    $  1.00    $  1.00   $  1.00   $1.00
                            -------    -------    -------   -------   -------------
Net investment income....     0.018      0.014      0.019     0.035       0.045
Less dividends from net
  investment income......    (0.018)    (0.014)    (0.019)   (0.035)     (0.045)
                            -------    -------    -------   -------   -------------
Net asset value, end of
  period.................   $  1.00    $  1.00    $  1.00   $  1.00   $1.00
                            -------    -------    -------   -------   -------------
                            -------    -------    -------   -------   -------------
TOTAL INVESTMENT
  RETURN.................      1.78%      1.36%      1.86%     3.57%   4.69   %(1)
RATIOS/SUPPLEMENTAL DATA:
Net assets, end of period
  (in thousands).........   $39,629    $41,112    $45,126   $66,196     $101,294
Ratios to average net
  assets:
  Expenses...............      1.03%      1.03%      0.97%     0.87%   0.12   %(2)(3)
  Net investment
   income................      1.75%      1.34%      1.86%     3.53%   5.66   %(2)(3)
<FN>
- ------------------------------
*     COMMENCEMENT OF OPERATIONS.
(1)   NOT ANNUALIZED.
(2)   ANNUALIZED.
(3)   IF THE FUND HAD BORNE ALL EXPENSES THAT WERE ASSUMED OR WAIVED BY THE
      INVESTMENT MANAGER, THE ABOVE ANNUALIZED EXPENSE AND NET INVESTMENT INCOME
      RATIOS WOULD HAVE BEEN 0.80% AND 4.98%, RESPECTIVELY.
</TABLE>

                       SEE NOTES TO FINANCIAL STATEMENTS

THE FUND AND ITS MANAGEMENT
- --------------------------------------------------------------------------------

    Dean Witter  New  York Municipal  Money  Market  Trust (the  "Fund")  is  an
open-end  non-diversified management investment company.  The Fund was organized
as a trust of  the type commonly  known as a  "Massachusetts business trust"  on
December  28,  1989.  Prior to  February  19,  1993, the  Fund's  name  was Dean
Witter/Sears New York Municipal Money Market Trust.
    Dean Witter InterCapital Inc. ("InterCapital" or the "Investment  Manager"),
whose address is Two World Trade Center, New York, New York 10048, is the Fund's
Investment  Manager.  The Investment  Manager, which  was incorporated  in July,
1992, is a wholly-owned  subsidiary of Dean Witter,  Discover & Co. ("DWDC"),  a
balanced  financial services organization providing  a broad range of nationally
marketed credit and investment products.

    InterCapital and its wholly-owned  subsidiary, Dean Witter Services  Company
Inc.,   serve  in  various  investment   management,  advisory,  management  and
administrative capacities to a total of ninety-one investment companies,  thirty
of  which are listed on the New  York Stock Exchange, with combined total assets
including this Fund of approximately $64.9 billion as of December 31, 1994.  The
Investment  Manager also manages portfolios of pension plans, other institutions
and

                                       4
<PAGE>
individuals which aggregated approximately $2.0 billion at such date.

    The Fund  has  retained the  Investment  Manager to  provide  administrative
services,  manage its business  affairs and manage the  investment of the Fund's
assets, including the placing of orders  for the purchase and sale of  portfolio
securities.  InterCapital  has retained  Dean  Witter Services  Company  Inc. to
perform the  aforementioned administrative  services for  the Fund.  The  Fund's
Board  of  Trustees  reviews  the  various services  provided  by  or  under the
direction of the Investment Manager to ensure that the Fund's general investment
policies and programs  are being  properly carried out  and that  administrative
services are being provided to the Fund in a satisfactory manner.

    As  full compensation for the services  and facilities furnished to the Fund
and expenses of the Fund  assumed by the Investment  Manager, the Fund pays  the
Investment  Manager monthly compensation  calculated daily at  an annual rate of
0.50% of the daily  net assets of the  Fund up to $500  million, scaled down  at
various  asset levels to  0.25% on assets  over $3 billion.  For the fiscal year
ended December 31, 1994, the Fund  accrued total compensation to the  Investment
Manager amounting to 0.50% of the Fund's average daily net assets and the Fund's
total expenses amounted to 1.03% of the Fund's average daily net assets.

INVESTMENT OBJECTIVE AND POLICIES
- --------------------------------------------------------------------------------

   
    The  investment objective of the Fund is to provide as high a level of daily
income exempt  from  federal and  New  York income  tax  as is  consistent  with
stability  of principal and  liquidity. It is  a fundamental policy  of the Fund
that at least 80% of its total  assets will be invested in tax-exempt  Municipal
Obligations  and at least 65% of the Fund's total assets will be invested in New
York Municipal Obligations. The  interest on New  York Municipal Obligations  is
exempt  from Federal, New York  State and New York  City income taxes. Municipal
Obligations other than New  York Municipal Obligations  are exempt from  Federal
tax  but  not from  New York  State and  New York  City taxes.  However, certain
Municipal Obligations in  which the Fund  may invest without  limit may  subject
certain  investors to the alternative minimum  tax and, therefore, a substantial
portion of the income  produced by the  Fund may be  taxable for such  investors
under  the alternative minimum tax. The Fund, therefore, may not ordinarily be a
suitable investment for  investors who  are subject to  the alternative  minimum
tax.  The  suitability  of the  Fund  for  these investors  will  depend  upon a
comparison of  the  after-tax yield  likely  to be  provided  from the  Fund  to
comparable tax-exempt investments not subject to such tax and also to comparable
fully  taxable investments  in light of  each such investor's  tax position (see
"Dividends, Distributions and  Taxes"). This  policy and  the Fund's  investment
objective  may  not  be changed  without  a vote  of  a majority  of  the Fund's
outstanding voting securities, as defined in the Investment Company Act of 1940,
as amended  (the  "Act"). There  is  no assurance  that  the objective  will  be
achieved.
    

    The  Fund seeks  to achieve  its investment  objective by  investing in high
quality tax-exempt securities with  short-term maturities (remaining  maturities
of  thirteen months or  less) as follows.  Such securities will  include (i) New
York Municipal Bonds, New York Municipal Notes and New York Municipal Commercial
Paper, which are rated at the time of purchase in one of the two highest  rating
categories   for  debt  obligations  by   at  least  two  nationally  recognized
statistical  rating  organizations   ("NRSROS"),  primarily  Moody's   Investors
Service,  Inc. ("Moody's")  or Standard and  Poor's Corporation  ("S&P"), or one
NRSRO if the obligation is rated by  only one NRSRO. Unrated obligations may  be
purchased  if they  are determined  to be  of comparable  quality by  the Fund's
Trustees.

                                       5
<PAGE>
    Up to 35% of the  Fund's total assets may  be invested in securities  exempt
from  federal income tax  but not from New  York State and  New York City income
taxes ("non-New York tax-exempt securities") and  up to 20% of the Fund's  total
assets  may  be  invested  in  taxable securities.  In  addition,  the  Fund may
temporarily invest more than 20% of  its total assets in taxable securities  and
more  than 35%  of its  total assets  in non-New  York tax-exempt  securities to
maintain a "defensive" posture when, in  the opinion of the Investment  Manager,
prevailing  market  or financial  conditions so  warrant.  The types  of taxable
securities in which the Fund may temporarily invest are limited to the following
short-term fixed-income securities (maturing in one  year or less from the  time
of  purchase); (i) obligations of the  United States Government or its agencies,
instrumentalities or authorities; (ii) commercial paper rated P-1 by Moody's  or
A-1  by S&P; (iii) certificates  of deposit of domestic  banks with assets of $1
billion or  more; and  (iv) repurchase  agreements with  respect to  any of  the
foregoing portfolio securities.

    Municipal  Bonds and  Municipal Notes are  debt obligations of  a state, its
cities, municipalities and municipal  agencies which generally have  maturities,
at  the time of their issuance,  of either one year or  more (Bonds) or from six
months to three years (Notes).  Municipal Commercial Paper refers to  short-term
obligations  of  municipalities  which  may  be issued  at  a  discount  and are
sometimes referred  to  as Short-Term  Discount  Notes. Any  Municipal  Bond  or
Municipal Note which depends directly or indirectly on the credit of the Federal
Government,  its agencies  or instrumentalities  shall be  considered to  have a
Moody's rating of Aaa or S&P rating of AAA. An obligation shall be considered  a
New  York  Municipal  Bond,  New  York  Municipal  Note  or  New  York Municipal
Commercial Paper only if, in the  opinion of bond counsel, the interest  payable
therefrom  is exempt from both  federal income tax and  New York personal income
tax.

    The foregoing  percentage  and  rating  limitations apply  at  the  time  of
acquisition of a security based on the last previous determination of the Fund's
net  asset value.  Any subsequent change  in any  rating by a  rating service or
change in percentages  resulting from  market fluctuations or  other changes  in
total  assets  will not  require  elimination of  any  security from  the Fund's
portfolio. However, in accordance with procedures adopted by the Fund's Trustees
pursuant to federal securities regulations governing money market funds, if  the
Investment  Manager becomes aware  that a portfolio security  has received a new
rating from an NRSRO that is below  the second highest rating, then, unless  the
security  is disposed of within five days, the Investment Manager will perform a
creditworthiness analysis  of  any such  downgraded  securities, which  will  be
reported  to the  Trustees who will,  in turn, determine  whether the securities
continue to present minimal credit risks to the Fund.

    The ratings assigned by NRSROs represent their opinions as to the quality of
the securities which they undertake to  rate (see the Appendix to the  Statement
of  Additional Information). It should be  emphasized, however, that the ratings
are general and not absolute standards of quality.

    The two principal classifications of  Municipal Bonds, Notes and  Commercial
Paper  are "general obligation" and "revenue"  bonds, notes or commercial paper.
General obligation bonds, notes or commercial paper are secured by the  issuer's
pledge  of its faith, credit  and taxing power for  the payment of principal and
interest. Issuers of general obligation bonds, notes or commercial paper include
a state,  its counties,  cities,  towns and  other governmental  units.  Revenue
bonds,  notes or commercial paper  are payable from the  revenues derived from a
particular facility or  class of  facilities or,  in some  cases, from  specific
revenue  sources. Revenue bonds, notes or commercial paper are issued for a wide
variety of purposes, including the financing  of electric, gas, water and  sewer
systems and other public utilities; industrial development and pollution control
facilities;   single  and  multi-family  housing  units;  public  buildings  and
facilities;

                                       6
<PAGE>
air and marine ports; transportation facilities such as toll roads, bridges  and
tunnels;   and  health  and   educational  facilities  such   as  hospitals  and
dormitories. They rely primarily on user fees to pay debt service, although  the
principal  revenue source is often  supplemented by additional security features
which are intended to enhance the creditworthiness of the issuer's  obligations.
In  some cases, particularly revenue bonds  issued to finance housing and public
buildings, a direct or implied "moral obligation" of a governmental unit may  be
pledged  to the payment of debt service. In  other cases, a special tax or other
charge may augment user fees.

    Included within  the  revenue bonds  category  are participations  in  lease
obligations  or installment purchase  contracts (hereinafter collectively called
"lease obligations") of municipalities. State and local governments issue  lease
obligations to acquire equipment and facilities.

    Lease  obligations  may  have  risks not  normally  associated  with general
obligation  or  other  revenue  bonds.   Leases  and  installment  purchase   or
conditional  sale contracts (which may provide for  title to the leased asset to
pass eventually  to the  issuer)  have developed  as  a means  for  governmental
issuers  to acquire  property and equipment  without the  necessity of complying
with the constitutional and statutory requirements generally applicable for  the
issuance  of debt. Certain lease obligations contain "non-appropriation" clauses
that provide  that the  governmental issuer  has no  obligation to  make  future
payments  under  the lease  or contract  unless money  is appropriated  for such
purpose by  the appropriate  legislative body  on an  annual or  other  periodic
basis.  Consequently,  continued  lease  payments  on  those  lease  obligations
containing "non-appropriation"  clauses  are  dependent  on  future  legislative
actions.  If such  legislative actions  do not occur,  the holders  of the lease
obligation may  experience  difficulty  in exercising  their  rights,  including
disposition of the property.

    Lease  obligations represent a relatively new type of financing that has not
yet developed  the  depth of  marketability  associated with  more  conventional
municipal  obligations, and, as a result,  certain of such lease obligations may
be considered illiquid  securities. To determine  whether or not  the Fund  will
consider  such securities to be illiquid (the  Fund may not invest more than ten
percent of its net assets in illiquid securities), the Trustees of the Fund have
established guidelines to be utilized by  the Fund in determining the  liquidity
of  a lease obligation. The factors to be considered in making the determination
include: (1) the frequency of trades  and quoted prices for the obligation;  (2)
the number of dealers willing to purchase or sell the security and the number of
other  potential purchasers; (3) the willingness of dealers to undertake to make
a market  in  the  security; and  (4)  the  nature of  the  marketplace  trades,
including  the time needed to dispose of  the security, the method of soliciting
offers, and the mechanics of the transfer.

   
    The Fund is classified as a non-diversified investment company under the Act
and as such is not limited  by the Act in the  proportion of its assets that  it
may  invest in the obligations of a  single issuer. However, the Fund intends to
conduct its operations  so as  to qualify  as a  "regulated investment  company"
under  Subchapter M of  the Internal Revenue Code  (the "Code"). See "Dividends,
Distribution and Taxes." In order to qualify, among other requirements, the Fund
will limit its investments so that at  the close of each quarter of the  taxable
year,  (i) not more than 25% of the market value of the Fund's total assets will
be invested in the securities of a  single issuer, and (ii) with respect to  50%
of the market value of its total assets not more than 5% will be invested in the
securities  of a single  issuer and the Fund  will not own more  than 10% of the
outstanding voting  securities  of  a  single  issuer.  To  the  extent  that  a
relatively  high  percentage  of  the  Fund's  assets  may  be  invested  in the
obligations of a limited number of issuers, the Fund's portfolio securities will
be more susceptible
    

                                       7
<PAGE>
to any single economic,  political or regulatory  occurrence than the  portfolio
securities  of a diversified investment  company. Additionally, the Fund's yield
will fluctuate to a greater extent than that of a diversified investment company
as a result of changes in the financial condition or in the market's  assessment
of  the various  issuers. The  limitations described  in this  paragraph are not
fundamental policies and may be revised to the extent applicable Federal  income
tax requirements are revised.

    The  Fund  may  invest more  than  25%  of its  total  assets  in industrial
development and  pollution  control bonds  (two  kinds of  tax-exempt  Municipal
Bonds)  whether or not the users of facilities financed by such bonds are in the
same industry. In cases where such users are in the same industry, there may  be
additional  risk  to the  Fund  in the  event of  an  economic downturn  in such
industry, which may result generally in a lowered need for such facilities and a
lowered ability of such users to pay for the use of such facilities.

    The high  quality, short-term  fixed  income securities  in which  the  Fund
principally  invests  are  guaranteed by  state  and local  governments  and are
subject to minimal risk of loss of income and principal.

PORTFOLIO MANAGEMENT

    Although the Fund will generally acquire securities for investment with  the
intent  of holding them to maturity and will not seek profits through short-term
trading, the Fund  may dispose of  any security  prior to its  maturity to  meet
redemption  requests. Securities  may also  be sold  when the  Fund's Investment
Manager believes such  disposition to  be advisable on  the basis  of a  revised
evaluation of the issuer or based upon relevant market considerations. There may
be  occasions when, as a result of maturities of portfolio securities or sale of
Fund shares, or in order to  meet anticipated redemption requests, the Fund  may
hold cash which is not earning income.

    The  Fund anticipates  that the average  weighted maturity  of the portfolio
will be  90  days  or less.  The  relatively  short-term nature  of  the  Fund's
portfolio  is expected to result  in a lower yield  than portfolios comprised of
longer-term tax-exempt securities.

    VARIABLE RATE AND FLOATING RATE  OBLIGATIONS. The interest rates payable  on
certain  Municipal Bonds  and Municipal  Notes are  not fixed  and may fluctuate
based upon  changes in  market rates.  Municipal obligations  of this  type  are
called "variable rate" or "floating rate" obligations. The interest rate payable
on  a  variable rate  obligation is  adjusted  either at  predesignated periodic
intervals or whenever there is a change in the market rate of interest on  which
the interest rate payable is based.

    WHEN-ISSUED   AND  DELAYED  DELIVERY  SECURITIES.   The  Fund  may  purchase
tax-exempt securities on a when-issued or delayed delivery basis; i.e., delivery
and payment can take place  a month or more after  the date of the  transaction.
These  securities are subject  to market fluctuation and  no interest accrues to
the purchaser prior to settlement. At the time the Fund makes the commitment  to
purchase  such securities, it will record the transaction and thereafter reflect
the value, each day, of such securities in determining its net asset value.

    BROKERAGE ALLOCATION.   Brokerage commissions  are not  normally charged  on
purchases  and sales of short-term  municipal obligations, but such transactions
may involve  transaction costs  in the  form of  spreads between  bid and  asked
prices. Pursuant to an order of the Securities and Exchange Commission, the Fund
may  effect principal transactions in certain money market instruments with Dean
Witter Reynolds  Inc. ("DWR"),  a broker-dealer  affiliate of  InterCapital.  In
addition,  the Fund  may incur  brokerage commissions  on transactions conducted
through DWR.

SPECIAL CONSIDERATIONS RELATING TO NEW YORK TAX-EXEMPT SECURITIES

    Since  the  Fund  concentrates  its  investments  in  New  York   tax-exempt
securities,  the  Fund  is affected  by  any political,  economic  or regulatory
develop-

                                       8
<PAGE>
ments affecting the ability  of New York tax-exempt  issuers to pay interest  or
repay  principal. Investors  should be  aware that  certain issuers  of New York
tax-exempt securities have experienced serious financial difficulties in  recent
years.  A reoccurrence of  these difficulties may impair  the ability of certain
New York issuers to maintain debt service on their obligations.

   
    The fiscal  stability of  New York  State (the  "State") is  related to  the
fiscal  stability of  the State's  municipalities, its  Agencies and Authorities
(which generally finance, construct and operate revenue-producing public benefit
facilities). This is  due in  part to the  fact that  Agencies, Authorities  and
local  governments in financial  trouble often seek  State financial assistance.
The experience  has been  that if  New  York City  (the "City")  or any  of  the
Agencies  or Authorities suffers serious  financial difficulty, both the ability
of the State, the City, the State's political subdivisions, the Agencies and the
Authorities to obtain  financing in  the public  credit markets  and the  market
price of outstanding New York tax-exempt securities are adversely affected.
    

    Over the long term, the State and City face potential economic problems. The
City accounts for a large portion of the State's population and personal income,
and  the City's financial health  affects the State in  numerous ways. The State
has historically been one of the  wealthiest states in the nation. For  decades,
however,  the State has grown more slowly  than the nation as a whole, gradually
eroding its relative economic affluence. The causes of this relative decline are
varied  and  complex,  in  many  cases  involving  national  and   international
developments   beyond  the  State's  control.   Statewide,  urban  centers  have
experienced significant changes involving migration of the more affluent to  the
suburbs  and an  influx of  generally less  affluent residents.  Regionally, the
older Northeast cities have  suffered because of the  relative success that  the
South and the West have had in attracting people and business. The City has also
had  to face greater competition as  other major cities have developed financial
and business  capabilities which  make them  less dependent  on the  specialized
services traditionally available almost exclusively in the City.

    The  State has  for many years  had a very  high state and  local tax burden
relative to other states.  The existence of this  tax burden limits the  State's
ability  to impose higher  taxes in the event  of future financial difficulties.
The State and its localities have used these taxes to develop and maintain their
transportation network,  public schools  and  colleges, public  health  systems,
other  social services and recreational  facilities. Despite these benefits, the
burden of state and local taxation, in combination with the many other causes of
regional economic dislocation, has contributed to the decisions of some business
and individuals to relocate outside, or not to locate within, the State. Certain
manufacturing facilities have  relocated to  other states. This  trend has  been
partially  offset by the location of  some manufacturing facilities in the State
and by the  expansion of existing  facilities in the  State. While no  sustained
reversal  of  the State's  relative economic  position  has been  projected, the
actions taken  to  date, in  combination  with  many other  causes  of  regional
economic  changes, have slowed this trend. Further reduction in Federal spending
could materially  and  adversely  affect  the  financial  condition  and  budget
projections of the State's localities.

    On  January 6, 1992,  Moody's lowered to  Baa-1 from A  its ratings on about
$14.2 billion  of  New  York  State appropriations  backed  debt.  Moody's  also
announced  that it had put New York  State general obligation debt rated A under
review for possible  downgrade in the  coming months. On  June 27, 1994  Moody's
reconfirmed   its  A  rating   on  the  State's   general  obligation  long-term
indebtedness.

    On January 13,  1992, S&P  lowered its rating  on New  York State's  general
obligation  bonds from A to A-. On  November 12, 1992, S&P continued its January
rating and  reiterated its  negative rating  outlook assessment  on the  State's
general  obligation  debt.  On  April  26,  1993,  S&P  raised  its  outlook  to

                                       9
<PAGE>
positive and, on June 27, 1994, confirmed its A- rating.

    For a  more  detailed discussion  of  New  York economic  factors,  see  the
Statement of Additional Information.

    The  summary information furnished above and  in the Statement of Additional
Information is based on  official statements prepared by  the State of New  York
and  the  City  of New  York  and  their authorities  in  connection  with their
borrowings  and  contains  such  information  as  the  Fund  deems  relevant  in
considering  an investment  in the Fund.  It does  not purport to  be a complete
description of the considerations contained therein.

INVESTMENT RESTRICTIONS
- --------------------------------------------------------------------------------

    The investment restrictions  listed below are  among the restrictions  which
have  been  adopted  by the  Fund  as  fundamental policies.  Under  the  Act, a
fundamental policy may  not be changed  without the  vote of a  majority of  the
outstanding voting securities of the Fund, as defined in the Act.

    For purposes of the following restrictions: (a) an "issuer" of a security is
the  entity whose assets and  revenues are committed to  the payment of interest
and principal on  that particular  security, provided  that the  guarantee of  a
security  will be  considered a  separate security  and provided  further that a
guarantee of a security shall not be  deemed a security issued by the  guarantor
if  the value of all securities issued  or guaranteed by the guarantor and owned
by the Fund does not exceed  10% of the value of  the total assets of the  Fund;
(b)  a "taxable security"  is any security  the interest on  which is subject to
federal income tax; and (c) all percentage limitations apply immediately after a
purchase or  initial investment,  and any  subsequent change  in any  applicable
percentage  resulting from market fluctuations or  other changes in total assets
does not require elimination of any security from the portfolio.

    The Fund may not:

    1. Make loans of money or securities, except:
(a) by the purchase of debt obligations in which the Fund may invest  consistent
with  its investment objective and policies; and (b) by investment in repurchase
agreements.

    2. Invest 25% or more of the value of its total
assets in  taxable  securities  of  issuers  in  any  one  industry  (industrial
development  and pollution control bonds are  grouped into industries based upon
the business  in  which the  issuers  of  such obligations  are  engaged).  This
restriction  does not  apply to obligations  issued or guaranteed  by the United
States  Government,   its  agencies   or  instrumentalities   or  to   Municipal
Obligations,  including those issued by  the State of New  York or its political
subdivisions, or to domestic bank obligations.

PURCHASE OF FUND SHARES
- --------------------------------------------------------------------------------

    The Fund offers its own shares for sale to the public on a continuous basis,
without a sales charge.  Pursuant to a Distribution  Agreement between the  Fund
and  Dean Witter  Distributors Inc.,  (the "Distributor"),  an affiliate  of the
Investment Manager, shares of  the Fund are distributed  by the Distributor  and
offered  by DWR  and other  dealers who  have entered  into agreements  with the
Distributor ("Selected Broker-Dealers"). The  principal executive office of  the
Distributor  is located at Two World Trade Center, New York, New York 10048. The
offering price of the shares  will be at their  net asset value next  determined
(see "Determination of Net Asset Value" below) after receipt of a purchase order
and  acceptance by  Dean Witter Trust  Company (the "Transfer  Agent") in proper
form and accompanied by payment in  Federal Funds (i.e., monies of member  banks
within the Federal Reserve System held

                                       10
<PAGE>
on  deposit at  a Federal  Reserve Bank) available  to the  Fund for investment.
Shares commence earning income on the day following the date of purchase.  Share
certificates will not be issued unless requested in writing by the shareholder.

    To  initiate purchase  by mail or  wire, a  completed Investment Application
(contained in  the  Prospectus) must  be  sent  directly to  Dean  Witter  Trust
Company,  at  P.O. Box  1040, Jersey  City,  N.J. 07303.  Checks should  be made
payable to the Dean  Witter New York  Municipal Money Market  Trust and sent  to
Dean  Witter  Trust Company  at the  above  address. Purchases  by wire  must be
preceded by  a call  to the  Transfer Agent  advising it  of the  purchase  (see
Investment  Application or the front cover  of this Prospectus for the telephone
number) and must be wired to The Bank of New York, for credit to the Account  of
Dean  Witter Trust Company, Harborside Financial Center, Plaza Two, Jersey City,
New Jersey, Account No. 8900188413. Wire purchase instructions must include  the
name  of the Fund and the shareholder's  account number. Purchases made by check
are normally effective  within two  business days  for checks  drawn on  Federal
Reserve  System member banks,  and longer for most  other checks. Wire purchases
received by the  Transfer Agent  prior to  12 noon  New York  time are  normally
effective  that day, and wire purchases received after 12 noon New York time are
normally effective the next business day.  Initial investments must be at  least
$5,000,  although the Fund, at its discretion, may accept initial investments of
smaller amounts, not less  than $1,000. Subsequent investments  must be $100  or
more and may be made through the Transfer Agent. The Fund will waive the minimum
initial  investment for the automatic reinvestment of distributions from certain
unit investment trusts. The Fund and the Distributor reserve the right to reject
any purchase order.

    Sales personnel are compensated for selling  shares of the Fund at the  time
of  their sale  by the Distributor  and/or Selected  Broker-Dealer. In addition,
some sales personnel of the Selected Broker-

Dealer will  receive various  types of  non-cash compensation  as special  sales
incentives,   including   trips,  educational   and/or  business   seminars  and
merchandise.

    Orders for the purchase  of Fund shares placed  by customers through DWR  or
other  Selected  Broker-Dealers with  payment in  clearing  house funds  will be
transmitted to  the Fund  with payment  in  Federal Funds  on the  business  day
following  the  day the  order is  placed by  the customer  with DWR  or another
Selected Broker-Dealer. Investors  desiring same day  effectiveness should  wire
Federal  Funds directly  to the Transfer  Agent. An order  procedure pursuant to
which customers can, upon request; (a) have the proceeds from the sale of listed
securities invested in  shares of  the Fund  on the  day following  the day  the
customer   receives  such  proceeds  in  his   or  her  DWR  or  other  Selected
Broker-Dealer brokerage account; and (b) pay for the purchase of certain  listed
securities  by automatic  liquidation of Fund  shares owned by  the customer. In
addition, there is  an automatic  purchase procedure whereby  consenting DWR  or
another  Selected Broker-Dealer customers who are  shareholders of the Fund will
have free cash credit  balances in their DWR  or another Selected  Broker-Dealer
brokerage accounts as of the close of business (4:00 P.M., New York time) on the
last  business  day of  each week  (where  such balances  do not  exceed $5,000)
automatically invested in shares  of the Fund the  next following business  day.
Investors  with free cash credit balances (i.e., immediately available funds) in
brokerage accounts at DWR or other Selected Broker-Dealers will not have any  of
such funds invested in the Fund until the business day after the customer places
an  order with DWR  or other Selected  Broker-Dealers to purchase  shares of the
Fund and will not receive the daily dividend which would have been received  had
such funds been invested in the Fund on the day the order was placed with DWR or
other Selected Broker-Dealers. Accordingly, DWR or other Selected Broker-Dealers
may have the use of such free credit balances during such period.

                                       11
<PAGE>
PLAN OF DISTRIBUTION

    The  Fund  has entered  into a  Plan of  Distribution with  the Distributor,
pursuant to Rule 12b-1 under the Act, whereby the expenses of certain activities
in connection with  the distribution of  the Fund's shares  are reimbursed.  The
principal activities and services which may be provided by the Distributor, DWR,
its  affiliates or any other Selected Broker-Dealers under the Plan include: (1)
compensation to,  and  expenses of,  DWR's  and other  Selected  Broker-Dealers'
account  executives  and  other  employees,  including  overhead  and  telephone
expenses; (2)  sales incentives  and  bonuses to  sales representatives  and  to
marketing personnel in connection with promoting sales of the Fund's shares; (3)
expenses  incurred in connection with promoting  sales of the Fund's shares; (4)
preparing and distributing sales literature;  and (5) providing advertising  and
promotional  activities,  including  direct  mail  solicitation  and television,
radio, newspaper, magazine  and other media  advertisements. Reimbursements  for
these  services will be  made in monthly payments  by the Fund  which will in no
event exceed an amount equal to  a payment at the annual  rate of 0.15 of 1%  of
the  Fund's average  daily net  assets. For the  fiscal year  ended December 31,
1994, the fee  accrued was equal  to payment at  an annual rate  of .10% of  the
Fund's  average daily net assets. Expenses incurred  pursuant to the Plan in any
fiscal year will not be reimbursed by  the Fund through payments accrued in  any
subsequent fiscal year.

DETERMINATION OF NET ASSET VALUE

    The  net asset value per share of the Fund is determined as of 4:00 p.m. New
York time on each  day that the New  York Stock Exchange is  open by taking  the
value of all assets of the Fund, subtracting its liabilities and dividing by the
number  of  shares  outstanding. The  net  asset  value per  share  will  not be
determined on Good Friday and on such other federal and non-federal holidays  as
are observed by the New York Stock Exchange.

    The  Fund  utilizes  the  amortized cost  method  in  valuing  its portfolio
securities, which method involves valuing a  security at its cost adjusted by  a
constant  amortization to maturity of any discount or premium, regardless of the
impact of fluctuating interest rates on the market value of the instrument.  The
purpose  of this  method of  calculation is to  facilitate the  maintenance of a
constant net asset value per share of $1.00. However, there can be no  assurance
that the $1.00 net asset value will be maintained.

SHAREHOLDER SERVICES
- --------------------------------------------------------------------------------

    SYSTEMATIC  WITHDRAWAL PLAN.  A systematic  withdrawal plan is available for
shareholders who own or purchase shares of the Fund having a minimum value of at
least  $5,000.  The  plan  provides  for  monthly  or  quarterly  (March,  June,
September,  December) checks in any  dollar amount not less  than $25, or in any
whole percentage of the account balance, on an annualized basis. The shares will
be redeemed at their net asset value determined, at the shareholder's option, on
the tenth or twenty-fifth day  (or next business day)  of the relevant month  or
quarter  and normally a  check for the  proceeds will be  mailed by the Transfer
Agent, or amounts  credited to  a shareholder's  DWR or  other Selected  Broker-
Dealer  brokerage  account, within  five days  after the  date of  redemption. A
shareholder wishing  to  make this  election  should  do so  on  the  Investment
Application. The withdrawal plan may be terminated at any time by the Fund.
    EASYINVEST-TM-.    Shareholders may  subscribe  to EasyInvest,  an automatic
purchase plan  which  provides  for  any  amount  from  $100  to  $5,000  to  be
transferred automatically from a checking or savings account, on a semi-monthly,
monthly  or quarterly basis, to  the Transfer Agent for  investment in shares of
the Fund. Shares purchased through EasyInvest will be added to the shareholder's
existing account at the net asset  value calculated the next business day  after
the transfer of funds is effected.

                                       12
<PAGE>
    EXCHANGE  PRIVILEGE.   An "Exchange  Privilege," that  is, the  privilege of
exchanging shares of certain  Dean Witter Funds for  shares of the Fund,  exists
whereby  shares  of  various Dean  Witter  Funds which  are  open-end investment
companies sold with either a front-end (at time of purchase) sales charge ("FESC
funds") or a  contingent deferred (at  time of redemption)  sales charge  ("CDSC
funds")  may be exchanged  for shares of  the Fund, Dean  Witter U.S. Government
Money Market  Trust,  Dean  Witter  Tax-Free Daily  Income  Trust,  Dean  Witter
California  Tax-Free Daily Income Trust and Dean Witter New York Municipal Money
Market Trust (which five funds are hereinafter called "money market funds"), and
for shares of Dean  Witter Short-Term U.S. Treasury  Trust, Dean Witter  Limited
Term  Municipal Trust and Dean Witter  Short-Term Bond Fund (the foregoing eight
non-FESC or CDSC funds are hereinafter collectively referred to in this  section
as  the "Exchange Funds"). When exchanging into a money market fund from an FESC
fund or a CDSC fund, shares  of the FESC fund or  the CDSC fund are redeemed  at
their  next calculated  net asset  value and exchanged  for shares  of the money
market fund at their net asset  value determined the following business day.  An
exchange  from an FESC  fund or a  CDSC fund to  an Exchange Fund  that is not a
money market fund is  on the basis  of the next calculated  net asset value  per
share of each fund after the exchange order is received. Subsequently, shares of
these  Exchange  Funds  received in  an  exchange  for shares  of  an  FESC fund
(regardless of  the type  of  fund originally  purchased)  may be  redeemed  and
exchanged  for shares of the Exchange Funds,  FESC funds or CDSC funds (however,
shares of CDSC funds,  including shares acquired in  exchange for (i) shares  of
FESC  funds or (ii) shares of the Exchange Funds which were acquired in exchange
for shares  of FESC  funds, may  not be  exchanged for  shares of  FESC  funds).
Additionally,  shares  of the  money market  funds received  in an  exchange for
shares of a CDSC fund (regardless of the type of fund originally purchased)  may
be  redeemed  and exchanged  for shares  of  the Exchange  Funds or  CDSC funds.
Ultimately, any applicable contingent deferred  sales charge ("CDSC") will  have
to  be paid upon redemption of shares originally purchased from a CDSC fund. (If
shares of  the  Exchange  Funds  received  in  exchange  for  shares  originally
purchased  from a CDSC fund are exchanged for shares of another CDSC fund having
a different CDSC schedule  than that of  the CDSC fund  from which the  Exchange
Funds  were acquired, the shares  will be subject to  the higher CDSC schedule.)
During the  period of  time the  shares originally  purchased from  a CDSC  fund
remain  in the Exchange Fund (calculated from the last day of the month in which
the Exchange Fund shares were acquired), the holding period (for the purpose  of
determining  the rate of the  CDSC) is frozen. If  those shares are subsequently
re-
exchanged for shares of a CDSC  fund, the holding period previously frozen  when
the first exchange was made resumes on the last day of the month in which shares
of a CDSC fund are reacquired. Thus, the CDSC is based upon the time (calculated
as described above) the shareholder was invested in a CDSC fund. However, in the
case  of shares exchanged into an Exchange Fund on or after April 23, 1990, upon
a redemption of shares which results in  a CDSC being imposed, a credit (not  to
exceed  the amount of the CDSC) will be given in an amount equal to the Exchange
Fund  12b-1  distribution  fees  incurred  on  or  after  that  date  which  are
attributable  to  those  shares  (see  "Purchase  of  Fund  Shares  --  Plan  of
Distribution" in the respective Exchange Funds Prospectuses for a description of
Exchange Fund distribution fees). Exchanges  involving FESC funds or CDSC  funds
may  be made after the shares of the FESC fund or CDSC fund acquired by purchase
(not by exchange or dividend reinvestment) have been held for thirty days. There
is no waiting period  for exchanges of shares  acquired by exchange or  dividend
reinvestment.

    Exchange  Privilege accounts may also be  maintained for shareholders of the
money market funds who acquired their  shares in exchange for shares of  various
TCW/DW  Funds, a  group of  funds distributed by  the Distributor  for which TCW
Funds

                                       13
<PAGE>
Management, Inc. serves as Adviser, under the terms and conditions described  in
the Prospectus and Statement of Additional Information of each TCW/DW Fund.

    Purchases  and  exchanges should  be made  for  investment purposes  only. A
pattern of frequent  exchanges may  be deemed by  the Investment  Manager to  be
abusive and contrary to the best interests of the Fund's other shareholders and,
at  the Investment Manager's discretion, may be limited by the Fund's refusal to
accept additional purchases and/  or exchanges from  the investor. Although  the
Fund  does not  have any  specific definition of  what constitutes  a pattern of
frequent exchanges,  and  will  consider all  relevant  factors  in  determining
whether  a particular situation is abusive and contrary to the best interests of
the Fund and its other shareholders, investors should be aware that the Fund and
each of the other Dean Witter Funds  may in their discretion limit or  otherwise
restrict  the number of  times this Exchange  Privilege may be  exercised by any
investor. Any such restriction will be made  by the Fund on a prospective  basis
only,  upon notice  to the  shareholder not later  than ten  days following such
shareholder's most recent exchange.

    The Exchange Privilege may be terminated or revised at any time by the  Fund
and/or  any of  such Dean Witter  Funds for which  shares of the  Fund have been
exchanged, upon such notice as may be required by applicable regulatory agencies
(presently  sixty  days  prior  written  notice  for  termination  or   material
revision),  provided that six months prior written notice of termination will be
given to the shareholders  who hold shares of  the Exchange Funds, TCW/DW  North
American Government Income Trust, TCW/DW Income and Growth Fund, TCW/DW Balanced
Fund  and  TCW/DW  North  American Intermediate  Income  Trust  pursuant  to the
Exchange Privilege,  and provided  further that  the Exchange  Privilege may  be
terminated   or  materially   revised  without  notice   under  certain  unusual
circumstances described in the Statement of Additional Information. Shareholders
maintaining margin  accounts  with  DWR or  other  Selected  Broker-Dealers  are
referred to their account executive regarding restrictions on exchange of shares
of the Fund pledged in the margin account.

    The  current prospectus for each  fund describes its investment objective(s)
and policies, and shareholders  should obtain one and  read it carefully  before
investing.  Exchanges are subject to the  minimum investment requirement and any
other conditions imposed by each fund. In the case of any shareholder holding  a
share certificate or certificates, no exchanges may be made until all applicable
share certificates have been received by the Transfer Agent and deposited in the
shareholder's  account.  An  exchange will  be  treated for  federal  income tax
purposes the  same  as  a  repurchase  or redemption  of  shares  on  which  the
shareholder  has realized a capital gain or loss. However, the ability to deduct
capital losses on an  exchange may be  limited in situations  where there is  an
exchange  of  shares within  ninety  days after  the  shares are  purchased. The
Exchange Privilege is only available in states where an exchange may legally  be
made.

    If DWR or another Selected Broker-Dealer is the current dealer of record and
its  account  numbers  are part  of  the account  information,  shareholders may
initiate an exchange of shares of the Fund  for shares of any of the above  Dean
Witter  Funds pursuant  to this  Exchange Privilege  by contacting  their DWR or
other  Selected   Broker-Dealer  account   executive  (no   Exchange   Privilege
Authorization  Form is required). Other shareholders (and those shareholders who
are clients  of DWR  or another  Selected  Broker-Dealer but  who wish  to  make
exchanges  directly by writing or telephoning  the Transfer Agent) must complete
and forward  to the  Transfer Agent  an Exchange  Privilege Authorization  Form,
copies  of  which  may be  obtained  from  the Transfer  Agent,  to  initiate an
exchange. If the Authorization Form is used, exchanges may be made in writing or
by contacting the Transfer  Agent at (800) 526-3143  (toll free). The Fund  will
employ  reasonable procedures to confirm that exchange instructions communicated
over the telephone are  genuine. Such procedures  may include requiring  various
forms of

                                       14
<PAGE>
personal  identification such as name, mailing address, social security or other
tax identification number and DWR or other Selected Broker-Dealer account number
(if any). Telephone instructions  may also be recorded.  If such procedures  are
not  employed, the  Fund may  be liable  for any  losses due  to unauthorized or
fraudulent instructions.  Telephone exchange  instructions will  be accepted  if
received by the Transfer Agent between 9:00 a.m. and 4:00 p.m. New York time, on
any  day the New York Stock Exchange is open. Any shareholder wishing to make an
exchange who has previously filed  an Exchange Privilege Authorization Form  and
who  is unable to reach the  Fund by telephone should contact  his or her DWR or
other Selected  Broker-Dealer  account  executive, if  appropriate,  or  make  a
written  exchange  request.  Shareholders  are advised  that  during  periods of
drastic economic or market changes, it  is possible that the telephone  exchange
procedures  may  be  difficult to  implement,  although  this has  not  been the
experience of the Dean Witter Funds in the past.

    For further information regarding the Exchange Privilege shareholders should
contact their  DWR or  other  Selected Broker-Dealer  account executive  or  the
Transfer Agent.

REDEMPTION AND REPURCHASE OF FUND SHARES
- --------------------------------------------------------------------------------

    A shareholder may withdraw all or any of his or her investments at any time,
without penalty or charge, by redeeming shares through the Transfer Agent at the
net  asset value  per share  next determined  (see "Purchase  of Fund  Shares --
Determination of Net  Asset Value") after  the receipt of  a redemption  request
meeting  the applicable requirements as follows (all of which are subject to the
General Redemption Requirements set forth below):

1. BY CHECK

    The Transfer  Agent will  supply blank  checks to  any shareholder  who  has
requested  them on  an Investment Application.  The shareholder  may make checks
payable to the order of anyone in any amount not less than $500 (checks  written
in  amounts under $500 will not be  honored by the Transfer Agent). Shareholders
must sign checks exactly  as their shares  are registered. If  the account is  a
joint  account, the check may contain one signature unless the joint owners have
specified on an  Investment Application  that all  owners are  required to  sign
checks.  Only shareholders having  accounts in which  no share certificates have
been issued will be permitted to redeem shares by check.

    Shares will  be redeemed  at  their net  asset  value next  determined  (see
"Purchase  of Fund Shares -- Determination of Net Asset Value") after receipt by
the Transfer Agent of a  check which does not exceed  the value of the  account.
Payment  of the proceeds of  a check will normally be  made on the next business
day after receipt  by the Transfer  Agent of  the check in  proper form.  Shares
purchased  by  check (including  a certified  or bank  cashier's check)  are not
normally available to cover redemption  checks until fifteen days after  receipt
of  the check used for investment by the Transfer Agent. The Transfer Agent will
not honor a check in  an amount exceeding the value  of the account at the  time
the check is presented for payment.

2. BY TELEPHONE OR WIRE INSTRUCTIONS WITH PAYMENT TO PREDESIGNATED BANK ACCOUNT

    A  shareholder may redeem shares by telephoning or sending wire instructions
to the  Transfer Agent.  Payment  will be  made by  the  Transfer Agent  to  the
shareholder's  bank account at any commercial bank designated by the shareholder
in an Investment Application, by  wire if the amount is  $1,000 or more and  the
shareholder  so requests,  and otherwise by  mail. Normally,  the Transfer Agent
will transmit payment the next business  day following receipt of a request  for
redemption   in  proper  form.  Only   shareholders  having  accounts  in  which

                                       15
<PAGE>
no share certificates  have been issued  will be permitted  to redeem shares  by
telephone or wire instructions.

    DWR  and  other  participating  Selected  Broker-Dealers  have  informed the
Distributor and the Fund that, on behalf of and as agent for their customers who
are shareholders  of the  Fund, they  will  transmit to  the Fund  requests  for
redemption of shares owned by their customers. In such cases, the Transfer Agent
will  wire proceeds of redemptions to  DWR's or another Selected Broker-Dealer's
bank account for  credit to  the shareholders' accounts  the following  business
day.  DWR and other participating Selected Broker-Dealers have also informed the
Distributor and the Fund that they do not charge for this service.

    Redemption instructions  must include  the  shareholder's name  and  account
number and be wired or called to the Transfer Agent:

    -- 800-526-3143 (Toll-Free)
    -- Telex No. 125076

3. BY MAIL

    A  shareholder may redeem  shares by sending  a letter to  Dean Witter Trust
Company, P.O.  Box  983,  Jersey  City,  NJ  07303,  requesting  redemption  and
surrendering share certificates if any have been issued.

    Redemption  proceeds  will  be  mailed  to the  shareholder  at  his  or her
registered address or mailed or wired to his or her predesignated bank  account,
as  he or she may request. Proceeds of redemption may also be sent to some other
person, as requested by the shareholder.

GENERAL REDEMPTION REQUIREMENTS

    Written  requests  for   redemption  must  be   signed  by  the   registered
shareholder[s].  If  the  proceeds are  to  be  paid to  anyone  other  than the
registered shareholder[s] or sent  to any address  other than the  shareholder's
registered  address or predesignated bank account, signatures must be guaranteed
by an eligible guarantor acceptable  to the Transfer Agent (shareholders  should
contact  the  Transfer Agent  for  a determination  as  to whether  a particular
institution is  an eligible  guarantor), except  in the  case of  redemption  by
check.  Additional  documentation may  be required  where shares  are held  by a
corporation, partnership, trustee or executor. With regard to shares of the Fund
acquired pursuant to the Exchange Privilege, any applicable contingent  deferred
sales  charge will be imposed upon the  redemption of such shares (see "Purchase
of Fund Shares--Exchange Privilege").

    If shares to be redeemed are represented by a share certificate, the request
for redemption  must  be  accompanied  by the  share  certificate  and  a  share
assignment  form signed by the registered  shareholder[s] exactly as the account
is registered. Shareholders are advised, for  their own protection, to send  the
share  certificate and assignment form in  separate envelopes (if they are being
mailed and  not  hand delivered)  to  the  Transfer Agent.  Signatures  must  be
guaranteed  by  an  eligible guarantor  acceptable  to the  Transfer  Agent (see
above). Additional documentation  may be  required where  shares are  held by  a
corporation, partnership, trustee or executor.

    All   requests  for  redemption,  all   share  certificates  and  all  share
assignments should be sent  to Dean Witter Trust  Company, P.O. Box 983,  Jersey
City, NJ 07303.

    Generally,  the Fund  will attempt to  make payment for  all redemptions and
repurchases within one business day, but in no event later than seven days after
receipt of such redemption request in proper form. However, if the shares  being
redeemed  or repurchased were purchased by  check (including a certified or bank
cashier's check), payment may be delayed  for the minimum time needed to  verify
that  the check used for investment has been honored (not more than fifteen days
from the time of receipt of the  check by the Transfer Agent). In addition,  the
Fund  may  postpone  redemptions or  repurchases  at certain  times  when normal
trading is not taking place on the New York Stock Exchange.

                                       16
<PAGE>

<TABLE>
<S>                                                                                                 <C><C><C><C>
                                                                                                    5 5 0 --
                                                                                                    for office
                                                                                                    use only
</TABLE>

APPLICATION

DEAN WITTER NEW YORK MUNICIPAL MONEY MARKET TRUST
Send to: Dean Witter Trust Company (the "Transfer Agent"), P.O. Box 1040, Jersey
City, NJ 07303

<TABLE>
<S>                   <C>  <C><C><C><C><C><C><C><C><C><C><C><C>
INSTRUCTIONS          For assistance in completing this application, telephone
Dean Witter Trust Company at (800) 526-3143 (Toll Free).

TO REGISTER
SHARES                1.
(please print)
                               First          Last
                               Name           Name
- -As joint tenants,
  use line 1 & 2      2.
                               First          Last
                               Name           Name
                          (Joint tenants with
                          rights of survivorship
                          unless otherwise
                          specified)
                                                   Social
                                                   Security
                                                   Number
- -As custodian
  for a minor,        3.
  use lines 1 & 3
                                          Minor's
                                          Name
                          Under the  Uniform      Minor's
                          Gifts to Minors Act     Social
                                                  Security
                                                  Number
                          State of Residence of
                          Minor
- -In the name of a
  corporation,        4.
  trust,
  partnership
  or other                           Name of Corporation,
                                       Trust (including
                                     trustee name(s)) or
                                      Other Organization
  institutional
  investors, use
  line 4
                          If Trust, Date of          Tax
                          Trust Instrument:       Identification
                                                  Number
ADDRESS
                                              City                                        State
                          Code
</TABLE>

<TABLE>
<S>                   <C>                                                 <C>
TO PURCHASE
SHARES:
Minimum Initial       / / CHECK (enclosed) $ (Make Payable to Dean
Investment:           Witter New York Municipal Money Market Trust)

$5,000                / / WIRE*  On           MF*
                              (Date)      (Control number, this transaction)

</TABLE>

<TABLE>
<S>         <C>                                                 <C>
            Name of Bank                                Branch

            Address

            Telephone Number

            * For an initial investment made by wiring funds,
            obtain a control number by calling: (800) 526-3143
            (Toll Free) or (201) 413-7067.
             Your bank should wire to:

            Bank of New York for credit to account of Dean
            Witter Trust Company
</TABLE>

<TABLE>
<S>         <C>                                                 <C>
            Account Number: 8900188413
            Re: Dean Witter New York Municipal Money Market
            Trust
            Account Of:  (Investor's Account as Registered at
             the Transfer Agent)

            Control or Account Number:
                        (Assigned by Telephone)

                                                OPTIONAL SERVICES
</TABLE>

<TABLE>
<S>       <C> <C><C><C>  <C>
            NOTE: If you are a current shareholder of Dean Witter New York Municipal Market Trust, please indicate
            your fund account number here.
            [5] [5] [0] -
</TABLE>

<TABLE>
<S>         <C>
DIVIDENDS   All dividends will be reinvested daily in additional shares, unless the following option is
            selected:
            / / Pay income dividends by check at the end of each month.
WRITE YOUR  / / Send an initial supply of checks.
OWN         FOR JOINT ACCOUNTS:
CHECK       / / Check this box if all owners are required to sign checks.
SYSTEMATIC  / / Systematic Withdrawal Plan  / / Percentage of balance (annualized basis)
WITHDRAWAL  ($25 minimum)                   % / / Monthly or / / Quarterly
PLAN        $ / / Monthly or / / Quarterly  / / 10th    or / / 25th of Month/Quarter
Minimum     / / 10th    or / / 25th of
Account     Month/Quarter
Value:      / / Pay shareholder(s) at
$5,000      address of record.
            / / Pay to the following: (If this payment option is selected a signature guarantee is required)
</TABLE>

<TABLE>
<S>         <C>                                                 <C>
            Name
            Address
            City                                                   State                                                   Zip
            Code
</TABLE>

<PAGE>
<TABLE>
<S>                         <C>
                            /  /    Dean Witter  Trust  Company is  hereby
authorized  to honor  telephonic  or other instructions, without signature
guarantee,  from any person for  the redemption of any  or
all  shares of  Dean Witter New  York Municipal Money  Market Trust held  in
my (our)

PAYMENT TO                       account provided that proceeds  are transmitted only to  the following bank  account.

PREDESIGNATED
BANK ACCOUNT                     (Absent its own negligence, neither Dean Witter New York Municipal Money Market Trust
                                 nor  Dean  Witter  Trust Company  (the  "Transfer  Agent") shall  be  liable  for any
                                 redemption caused by unauthorized instruction(s)):
Bank Account must be in
same  name  as  shares  are
registered
                            NAME & BANK ACCOUNT NUMBER
Minimum Amount:
$1,000                      NAME OF BANK

                            ADDRESS OF BANK

                            ()
                            TELEPHONE NUMBER OF BANK

                            SIGNATURE AUTHORIZATION
FOR ALL ACCOUNTS            NOTE: RETAIN A COPY OF THIS DOCUMENT FOR YOUR
                            RECORDS. ANY MODIFICATION OF THE INFORMATION
                            BELOW WILL REQUIRE AN AMENDMENT  TO THIS FORM.
                            THIS DOCUMENT  IS IN FULL FORCE AND  EFFECT
                            UNTIL ANOTHER DULY EXECUTED FORM IS RECEIVED BY
                            THE TRANSFER AGENT.

                            The  "Transfer Agent"  is hereby authorized  to
                            act as  agent for the  registered owner of
                            shares of Dean  Witter New York  Municipal Money
                            Market Trust (the  "Fund") in  effecting
                            redemptions  of shares and is authorized to
                            recognize the signature(s) below in payment of
                            funds resulting from such redemptions on behalf
                            of the registered owners of such  shares.
                            The  Transfer Agent shall  be liable only  for its
                            own  negligence and not  for default or
                            negligence of its correspondents, or for losses
                            in transit. The Fund shall not be  liable
                            for any default or negligence of the Transfer
                            Agent.

                            I (we) certify to my (our) legal capacity, or the
                            capacity of the investor named above, to
                            invest in and redeem shares of, and I (we)
                            acknowledge receipt of a current prospectus of,
                            Dean  Witter  New York  Municipal Money  Market
                            Trust  and (we)  further certify  my (our)
                            authority to sign and act for and on behalf of the
                            investor.

                            Under penalties of perjury, I certify (1) that the
                            number shown on this form is my correct
                            taxpayer identification number and (2) that I am
                            not subject to backup withholding  either
                            because  I have not been notified that I am
                            subject to backup withholding as a result of a
                            failure to report all interest or dividends, or
                            the Internal Revenue Service has  notified
                            me  that I am no longer subject to backup
                            withholding. (Note: You must cross out item (2)
                            above if  you  have  been notified  by  IRS  that
                            you are  currently  subject  to  backup
                            withholding because of underreporting interest or
                            dividends on your tax return.)

                            For Individual, Joint and Custodial Accounts
                            for  Minors, Check Applicable Box:
                            / / I am a United States Citizen.
                           / /  I am not a United States
                                 Citizen.

                   SIGNATURE(S) (IF JOINT TENANTS, ALL MUST SIGN)

<CAPTION>

PAYMENT TO
PREDESIGNATED
BANK ACCOUNT

Bank Account must be in
same  name  as  shares  ar
registered
                              BANK'S ROUTING TRANSMIT
                                       CODE
                                  (ASK YOUR BANK)
Minimum Amount:
$1,000

FOR ALL ACCOUNTS

</TABLE>

<TABLE>
<S>                   <C>                                                <C>
Name(s) must be
signed exactly the
same as shown on
lines 1 to 4 on the
reverse side of this
application

                      SIGNED THIS  DAY OF , 19.

         FOR CORPORATIONS, TRUSTS, PARTNERSHIPS AND OTHER ORGANIZATIONS

The  following  named  persons  are  currently  officers/trustees/general
partners/other authorized signatories of the Registered  Owner, and any  * of
them  ("Authorized Person(s)") is/are  currently authorized  under  the applicable  governing
document  to act  with  full power  to sell,  assign or
transfer securities  of the  the  Fund for  the Registered  Owner  and to
execute and  deliver  any instrument necessary to effectuate the authority hereby conferred:
                                         NAME/TITLE                                          SIGNATURE


In addition,
complete
Section A or B
below.

                      SIGNED THIS  DAY OF , 19.
                      The  Transfer Agent may, without inquiry, act only  upon
the instruction of ANY PERSON(S) purporting to be (an) Authorized  Person(s)
as named in  the Certification Form last  received by the  Transfer Agent. The
Transfer Agent and the Fund shall not be liable for any claims, expenses
(including legal fees)  or losses  resulting from  the Transfer  Agent having
acted upon  any instruction reasonably believed genuine.

*INSERT A NUMBER. UNLESS OTHERWISE INDICATED, THE  TRANSFER AGENT MAY HONOR
INSTRUCTIONS OF ANY  ONE OF THE PERSONS NAMED ABOVE.
</TABLE>

<TABLE>
<S>                   <C>
SECTION (A)           NOTE: EITHER A SIGNATURE GUARANTEE OR CORPORATE SEAL
                      IS REQUIRED.
CORPORATIONS AND IN-
CORPORATED
ASSOCIATIONS ONLY.    I,  , Secretary of the Registered Owner, do hereby
                      certify  that at a meeting on at which a quorum
SIGN ABOVE AND COM-   was present throughout, the Board of Directors of the
                      corporation/the officers of the  association
PLETE THIS            duly adopted a resolution, which is in full force and
                      effect and in accordance with the Registered
SECTION               Owner's  charter and by-laws,  which resolution did  the
                      following: (1)  empowered the above-named
                      Authorized Person(s)  to effect  securities
                      transactions  for the  Registered Owner  on the  terms
                      described  above; (2) authorized the Secretary to
                      certify, from time to time, the names and titles
                      of the officers of the Registered  Owner and to notify
                      the  Transfer Agent when changes in  office
                      occur;  and (3) authorized the Secretary  to certify
                      that such a  resolution has been duly adopted
                      and will  remain in  full force  and effect  until the
                      Transfer Agent  receives a  duly  executed
                      amendment to the Certification Form.
SIGNATURE
GUARANTEE**           Witness my hand on behalf of the corporation/association
                      this day of , 19.
(or Corporate Seal)
                                        Secretary**
                      The  undersigned officer (other than the Secretary)
                      hereby certifies that the foregoing instrument
                      has been signed by the Secretary of the
                      corporation/association.
SIGNATURE
GUARANTEE**
(or Corporate Seal)                  Certifying Officer of the Corporation or
                                      Incorporated Association**

SECTION (B) ALL        NOTE: A SIGNATURE GUARANTEE IS REQUIRED.
OTHER
INSTITUTIONAL
INVESTORS                                    Certifying
SIGNATURE                      Trustee(s)/General Partner(s)/Other(s)**

GUARANTEE**
SIGN ABOVE AND COM-                          Certifying
PLETE THIS SECTION             Trustee(s)/General Partner(s)/Other(s)**

         **SIGNATURE(S) MUST BE GUARANTEED BY AN ELIBIGLE GUARANTOR
</TABLE>
<TABLE>
<S>                             <C>                                                           <C>
DEALER            Above signature(s) guaranteed. Prospectus has been delivered
                  by undersigned to above-named applicant(s).
(if any)
Completion by dealer only
                                Firm Name
                                Address
                                City, State, Zip Code

<CAPTION>
DEALER
(if any)
Completion by dealer only
                                Office Number-Account Number at Dealer-A/E Number
                                Account Executive's Last Name
                                Branch Office
</TABLE>

   
- -Registered Trademark- 1995 Dean Witter Distributors Inc.
    
<PAGE>
    The  Fund reserves  the right, on  60 days'  notice, to redeem  at their net
asset value  the  shares  of any  shareholder  (other  than shares  held  in  an
Individual  Retirement Account or  custodial account under  Section 403(b)(7) of
the Internal Revenue Code)  whose shares due to  redemptions by the  shareholder
have  a value of less than $1,000, or such  lesser amount as may be fixed by the
Board of Trustees.

AUTOMATIC REDEMPTION PROCEDURE

    The Distributor has  instituted an automatic  redemption procedure which  it
may  utilize to satisfy amounts due it  by a shareholder maintaining a brokerage
account with DWR or another Selected Broker-Dealer, as a result of purchases  of
securities  or other transactions in  the shareholder's brokerage account. Under
this procedure, if the shareholder elects to participate by so notifying DWR  or
another   Selected  Broker-Dealer,  the  shareholder's  DWR  or  other  Selected
Broker-Dealer brokerage account will be scanned  each business day prior to  the
close  of business  (4:00 P.M.,  New York time).  After application  of any cash
balances in the account, a sufficient number  of Fund shares may be redeemed  at
the  close  of business  to satisfy  any  amounts for  which the  shareholder is
obligated to make payment  to DWR or  other Selected Broker-Dealer.  Redemptions
will  be effected  on the  business day  preceding the  date the  shareholder is
obligated to make  such payment, and  DWR or other  Selected Broker-Dealer  will
receive  the  redemption  proceeds on  the  day following  the  redemption date.
Shareholders will receive all dividends declared and reinvested through the date
of redemption.

DIVIDENDS, DISTRIBUTIONS AND TAXES
- --------------------------------------------------------------------------------

    DIVIDENDS AND DISTRIBUTIONS.  The  Fund declares dividends, payable on  each
day  the New York Stock Exchange  is open for business, of  all of its daily net
investment income to  shareholders of  record as of  the close  of business  the
preceding  business day.  Dividends from net  short-term capital  gains, if any,
will be paid periodically. The amount of dividend may fluctuate from day to  day
and  may be omitted on some days  if net realized losses on portfolio securities
exceed  the  Fund's   net  investment   income.  Dividends   are  declared   and
automatically  reinvested daily in additional full  and fractional shares of the
Fund (rounded to the last 1/100 of a share) at the net asset value per share  at
the close of business on that day. Any dividends declared in the last quarter of
any  calendar  year which  are  paid in  the  following calendar  year  prior to
February 1 will be deemed received by the shareholder in the prior year.

    Shareholders may  instruct the  Transfer Agent  (in writing)  to have  their
dividends paid out monthly in cash. For such shareholders, the shares reinvested
and  credited to their account during the month will be redeemed as of the close
of business on the monthly  payment date (which will be  no later than the  last
business  day of  the month)  and the proceeds  will be  paid to  them by check.
Processing of dividend checks begins  immediately following the monthly  payment
date. Shareholders who have requested to receive dividends in cash will normally
receive  their monthly dividend check during the first ten days of the following
month.

    Share certificates for dividends or distributions will not be issued  unless
a  shareholder requests in writing  that a certificate be  issued for a specific
number of shares.

    TAXES.  Because the Fund intends to distribute substantially all of its  net
investment income and net capital gains, if any, to shareholders, and intends to
otherwise comply with all the provisions of Subchapter M of the Internal Revenue
Code  of 1986,  as amended  (the "Code"), to  qualify as  a regulated investment
company, it is not expected  that the Fund will be  required to pay any  federal
income tax.

    The  Fund  intends  to qualify  to  pay "exempt-interest  dividends"  to its
shareholders by maintaining,  as of  the close of  each quarter  of its  taxable

                                       17
<PAGE>
year, at least 50% of the value of its total assets in tax-exempt securities. If
the  Fund satisfies  such requirement, dividends  from net  investment income to
shareholders, whether taken  in cash  or reinvested in  additional Fund  shares,
will  be excludable  from gross  income for federal  income tax  purposes to the
extent net interest income is represented by interest on tax-exempt  securities.
Exempt-interest dividends are included, however, in determining what portion, if
any, of a person's Social Security benefits are subject to federal income tax.

    The   Code  subjects  interest  received  on  certain  otherwise  tax-exempt
securities to an alternative minimum  tax. This alternative minimum tax  applies
to interest received on "private activity bonds" (in general, bonds that benefit
non-government entities) issued after August 7, 1986 which, although tax-exempt,
are used for purposes other than those generally performed by governmental units
(e.g.,  bonds used for commercial or  housing purposes). Income received on such
bonds is classified  as a "tax  preference item" under  the alternative  minimum
tax,  for both individual  and corporate investors. The  Fund may invest without
limit in  such "private  activity bonds,"  with the  result that  a  substantial
portion  of the exempt-interest dividends paid by the Fund may be an item of tax
preference to shareholders subject to the alternative minimum tax. In  addition,
certain  corporations which are subject to  the alternative minimum tax may have
to  include  a  portion  of  exempt-interest  dividends  in  calculating   their
alternative  minimum  taxable income  in situations  where the  adjusted current
earnings of the corporation exceeds its alternative minimum taxable income.

    After the  end  of  its calendar  year,  the  shareholders will  be  sent  a
statement  indicating  the percentage  of  the dividend  distributions  for such
taxable year which constitutes exempt-interest dividends and the percentage,  if
any,  that  is  taxable, and  the  percentage,  if any,  of  the exempt-interest
dividends which constitutes an item of  tax preference. (Unlike federal law,  no
portion  of  the  exempt-interest  dividends  will  constitute  an  item  of tax
preference for New York personal income tax purposes.) This percentage should be
applied uniformly to any distributions made during the taxable year to determine
the proportion of dividends that is  tax-exempt. The percentage may differ  from
the percentage of tax-exempt dividend distributions for any particular month.

    To  the  extent  that  dividends  are  derived  from  interest  on  New York
tax-exempt securities, such dividends  will also be exempt  from New York  State
and  New York City personal income  taxes. Shareholders will normally be subject
to federal and New York State and New York City personal income tax on dividends
paid from interest income derived  from taxable securities and on  distributions
of net capital gains. For federal and New York State or New York City income tax
purposes,  distributions of net long-term capital  gains, if any, are taxable to
shareholders as long-term capital gains, regardless of how long the  shareholder
has  held the Fund shares and regardless of whether the distribution is received
in additional  shares  or in  cash.  To avoid  being  subject to  a  31%  backup
withholding  tax on  taxable dividends and  capital gains  distributions and the
proceeds of redemptions and  repurchases, shareholders' taxpayer  identification
numbers must be furnished and certified as to accuracy.

    Interest  on  indebtedness incurred  by shareholders  or related  parties to
purchase or  carry  shares  of  an  investment  company  paying  exempt-interest
dividends,  such as the Fund, will not be deductible by the investor for federal
or New York State or New York City personal income tax purposes.

    The foregoing relates to federal income  taxation and to New York State  and
New  York City  personal income  taxation as in  effect as  of the  date of this
Prospectus.

    Shareholders should consult their  tax advisers as  to the applicability  of
the above to their own tax situation.

                                       18
<PAGE>
CURRENT AND EFFECTIVE YIELD


   
    From  time to  time the Fund  advertises its "yield"  and "effective yield."
Both yield figures  are based  on historical earnings  and are  not intended  to
indicate  future  performance. The  "yield"  of the  Fund  refers to  the income
generated by an  investment in  the Fund over  a given  seven-day period  (which
period  will be stated in the  advertisement). This income is then "annualized."
That is, the amount of income generated by the investment during that  seven-day
period  is assumed to be generated each seven-day period within a 365-day period
and is shown  as a percentage  of the  investment. The "effective  yield" for  a
seven-day  period  is calculated  similarly,  but, when  annualized,  the income
earned by an investment in the Fund is assumed to be reinvested each week within
a 365-day period. The "effective yield" will be slightly higher than the "yield"
because of the  compounding effect of  this assumed reinvestment.  The Fund  may
also  quote tax-equivalent yield which is  calculated by determining the pre-tax
yield which, after  being taxed at  a stated  rate, would be  equivalent to  the
yield  determined as described above. The Fund  may also advertise the growth of
hypothetical investments of $10,000, $50,000 and $100,000 in shares of the Fund.
    
ADDITIONAL INFORMATION
- --------------------------------------------------------------------------------

    VOTING RIGHTS.  All shares of beneficial  interest of the Fund are of  $0.01
par value and are equal as to earnings, assets and voting privileges.

    The  Fund is  not required  to hold Annual  Meetings of  Shareholders and in
ordinary circumstances  the Fund  does not  intend to  hold such  meetings.  The
Trustees  may call  Special Meetings of  Shareholders for  action by shareholder
vote as may be required  by the Act or the  Declaration of Trust. Under  certain
circumstances,  the Trustees may be removed by  action of the Trustees or by the
Shareholders.

    Under Massachusetts law, shareholders of a business trust may, under certain
circumstances, be  held personally  liable as  partners for  obligations of  the
Fund.  However,  the  Declaration of  Trust  contains an  express  disclaimer of
shareholder liability for acts or obligations of the Fund, requires that  notice
of  such disclaimer be given in each  instrument entered into or executed by the
Fund and provides for indemnification and  reimbursement of expenses out of  the
Fund's  property for any shareholder held  personally liable for the obligations
of the Fund. Thus, the risk of a shareholder incurring financial loss on account
of shareholder liability is  limited to circumstances in  which the Fund  itself
would  be  unable  to  meet  its obligations.  Given  the  above  limitations on
shareholder  personal  liability  and  the  nature  of  the  Fund's  assets  and
operations,  the possibility of the Fund being unable to meet its obligations is
remote and, in the  opinion of Massachusetts  counsel to the  Fund, the risk  to
Fund shareholders of personal liability is remote.

   
    CODE  OF ETHICS.   Directors, officers  and employees  of InterCapital, Dean
Witter Services Company Inc. and the Distributor are subject to a strict Code of
Ethics adopted by those companies. The Code of Ethics is intended to ensure that
the interests of shareholders and other clients are placed ahead of any personal
interest, that no undue personal benefit is obtained from a person's  employment
activities  and that actual and potential  conflicts of interest are avoided. To
achieve these goals and comply with regulatory requirements, the Code of  Ethics
requires, among other things, that personal securities transactions by employees
of  the companies be subject to an  advance clearance process to monitor that no
Dean Witter Fund is engaged at the same  time in a purchase or sale of the  same
security.  The Code  of Ethics  bans the  purchase of  securities in  an initial
public offering and prohibits  engaging in futures  and option transactions  and
profiting on short-term trading (that is, a purchase within sixty days of a sale
or  a  sale  within  sixty days  of  a  purchase) of  a  security.  In addition,
investment
person-
    
                                       19
<PAGE>
   
nel may not purchase or sell a security for their personal account within thirty
days before or after any  transaction in any Dean  Witter Fund managed by  them.
Any  violations  of  the Code  of  Ethics  are subject  to  sanctions, including
reprimand, demotion  or suspension  or termination  of employment.  The Code  of
Ethics  comports  with regulatory  requirements and  the recommendations  in the
recent report by  the Investment  Company Institute Advisory  Group on  Personal
Investing.
    

   
    SHAREHOLDER INQUIRIES. All inquiries regarding the Fund should be directed
to the Fund or the Transfer  Agent at one  of the telephone  numbers or at the
addresses, as are set forth on the front cover of this Prospectus.
    

                                       20
<PAGE>
DEAN WITTER NEW YORK MUNICIPAL MONEY MARKET TRUST
FINANCIAL STATEMENTS
- --------------------------------------------------------------------------------
STATEMENT OF ASSETS AND LIABILITIES
DECEMBER 31, 1994
- --------------------------------------------------------------------------------

<TABLE>
<S>                                          <C>
ASSETS:
Investments in securities, at value
  (amortized cost $39,986,178).............  $ 39,986,178
Cash.......................................       163,347
Interest receivable........................       236,261
Deferred organizational expenses...........         2,295
Prepaid expenses...........................        10,038
                                             ------------
        TOTAL ASSETS.......................    40,398,119
                                             ------------
LIABILITIES:
Payable for:
  Shares of beneficial interest
    repurchased............................       650,945
  Investment management fee................        16,950
  Plan of distribution fee.................         3,390
Accrued expenses...........................        97,955
                                             ------------
        TOTAL LIABILITIES..................       769,240
                                             ------------
NET ASSETS:
Paid-in-capital............................    39,629,282
Accumulated undistributed net investment
  income...................................            18
Accumulated net realized loss..............          (421)
                                             ------------
        NET ASSETS.........................  $ 39,628,879
                                             ------------
                                             ------------
NET ASSET VALUE PER SHARE, 39,629,282
  shares outstanding (unlimited shares
  authorized of $.01 par value)............
                                                    $1.00
                                             ------------
                                             ------------
</TABLE>

STATEMENT OF OPERATIONS
FOR THE YEAR ENDED DECEMBER 31, 1994

<TABLE>
<S>                                           <C>
NET INVESTMENT INCOME:
  INTEREST INCOME...........................  $ 1,206,782
                                              -----------
  EXPENSES
    Investment management fee...............      216,726
    Professional fees.......................       48,599
    Transfer agent fees and expenses........       45,972
    Plan of distribution fee................       42,774
    Shareholder reports and notices.........       38,125
    Trustees' fees and expenses.............       27,941
    Organizational expenses.................       10,691
    Registration fees.......................        7,026
    Custodian fees..........................        3,516
    Other...................................        4,550
                                              -----------
        TOTAL EXPENSES......................      445,920
                                              -----------
            NET INVESTMENT INCOME AND NET
              INCREASE IN NET ASSETS
              RESULTING FROM OPERATIONS.....  $   760,862
                                              -----------
                                              -----------
</TABLE>

STATEMENT OF CHANGES IN NET ASSETS
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                                           FOR THE YEAR ENDED  FOR THE YEAR ENDED
                                                                           DECEMBER 31, 1994   DECEMBER 31, 1993
                                                                           ------------------  ------------------
<S>                                                                        <C>                 <C>
INCREASE (DECREASE) IN NET ASSETS:
  Operations:
    Net investment income................................................     $    760,862        $    605,211
    Net realized loss....................................................          --                   (1,000)
                                                                           ------------------  ------------------
        Net increase.....................................................          760,862             604,211
                                                                           ------------------  ------------------
  Dividends to shareholders from net investment income...................         (760,887)           (605,204)
  Net decrease from transactions in shares of beneficial interest........       (1,483,202)         (4,013,139)
                                                                           ------------------  ------------------
        Total decrease...................................................       (1,483,227)         (4,014,132)
NET ASSETS:
  Beginning of period....................................................       41,112,106          45,126,238
                                                                           ------------------  ------------------
  END OF PERIOD (including undistributed net investment income of $18 and
   $43, respectively)....................................................     $ 39,628,879        $ 41,112,106
                                                                           ------------------  ------------------
                                                                           ------------------  ------------------
</TABLE>

                       SEE NOTES TO FINANCIAL STATEMENTS

                                       21
<PAGE>
DEAN WITTER NEW YORK MUNICIPAL MONEY MARKET TRUST
NOTES TO FINANCIAL STATEMENTS
- --------------------------------------------------------------------------------

1.   ORGANIZATION AND ACCOUNTING POLICIES--Dean  Witter New York Municipal Money
Market Trust (the  "Fund") is  registered under  the Investment  Company Act  of
1940,  as  amended  (the  "Act"),  as  a  non-diversified,  open-end  management
investment company. The Fund was organized as a Massachusetts business trust  on
December 28, 1989 and commenced operations on March 20, 1990.

    The following is a summary of significant accounting policies:

    A.  VALUATION OF  INVESTMENTS--Portfolio securities are  valued at amortized
    cost, which approximates market value.

    B. ACCOUNTING FOR  INVESTMENTS--Security transactions are  accounted for  on
    the  trade date (date the order to  buy or sell is executed). Realized gains
    and losses on security  transactions are determined  by the identified  cost
    method.  The Fund amortizes  premiums and discounts  on securities purchased
    over the  life of  the  respective securities.  Interest income  is  accrued
    daily.

    C.  FEDERAL INCOME TAX  STATUS--It is the  Fund's policy to  comply with the
    requirements of the Internal Revenue Code applicable to regulated investment
    companies and to distribute all of its taxable and nontaxable income to  its
    shareholders. Accordingly, no federal income tax provision is required.

    D.  DIVIDENDS AND DISTRIBUTIONS TO  SHAREHOLDERS--The Fund records dividends
    and distributions to shareholders as of the close of each business day.

    E. ORGANIZATIONAL EXPENSES--Dean Witter  InterCapital Inc. (the  "Investment
    Manager")  paid the  organizational expenses of  approximately $58,000 which
    have been reimbursed for  the full amount thereof.  Such expenses have  been
    deferred  and are being amortized on a straight-line basis over a period not
    to exceed five years from the commencement of operations.

2.   INVESTMENT  MANAGEMENT  AGREEMENT--Pursuant  to  an  Investment  Management
Agreement,  the Fund pays its Investment Manager a management fee, accrued daily
and payable monthly, by applying the following annual rates to the net assets of
the Fund determined as of the close  of each business day: 0.50% to the  portion
of the daily net assets not exceeding $500 million; 0.425% to the portion of the
daily  net assets exceeding $500 million  but not exceeding $750 million; 0.375%
to the portion of the daily net assets exceeding $750 million but not  exceeding
$1  billion; 0.35% to the  portion of the daily  net assets exceeding $1 billion
but not exceeding $1.5 billion;  0.325% to the portion  of the daily net  assets
exceeding $1.5 billion but not exceeding $2 billion; 0.30% to the portion of the
daily  net assets exceeding $2 billion but not exceeding $2.5 billion; 0.275% to
the portion of the daily net assets exceeding $2.5 billion but not exceeding  $3
billion; and 0.25% to the portion of the daily net assets exceeding $3 billion.

    Under  the  terms  of the  Agreement,  in  addition to  managing  the Fund's
investments, the Investment Manager  maintains certain of  the Fund's books  and
records  and furnishes, at its own expense, office space, facilities, equipment,
clerical, bookkeeping and certain  legal services and pays  the salaries of  all
personnel,  including officers of  the Fund who are  employees of the Investment
Manager. The Investment Manager also bears the cost of telephone services, heat,
light, power and other utilities provided to the Fund.

3.  PLAN OF DISTRIBUTION--Dean Witter Distributors Inc. (the "Distributor"),  an
affiliate  of the  Investment Manager, is  the distributor of  the Fund's shares
and, in accordance  with a Plan  of Distribution (the  "Plan") pursuant to  Rule
12b-1 under the Act, finances certain expenses in connection therewith.

    Under  the Plan,  the Distributor bears  the expense of  all promotional and
distribution related activities on behalf of the Fund, except for expenses  that
the   Trustees  determine  to  reimburse,  as  described  below.  The  following
activities  and  services  may  be   provided  by  the  Distributor  and   other
broker-dealers under the

                                       22
<PAGE>
DEAN WITTER NEW YORK MUNICIPAL MONEY MARKET TRUST
NOTES TO FINANCIAL STATEMENTS (CONTINUED)
- --------------------------------------------------------------------------------
Plan:   (1)  compensation  to   and  expenses  of   the  Distributor  and  other
broker-dealers; (2) sales incentives and bonuses to sales representatives and to
marketing personnel in connection with promoting sales of the Fund's shares; (3)
expenses incurred in connection with promoting  sales of the Fund's shares;  (4)
preparing  and distributing sales literature;  and (5) providing advertising and
promotional activities,  including  direct  mail  solicitation  and  television,
radio, newspaper, magazine and other media advertisements.

    The  Fund is authorized  to reimburse the  Distributor for specific expenses
the Distributor incurs or  plans to incur in  promoting the distribution of  the
Fund's  shares. The amount of each monthly reimbursement payment may in no event
exceed an amount equal to  a payment at the annual  rate of 0.15% of the  Fund's
average  daily net assets during the month. Expenses incurred by the Distributor
pursuant to the  Plan in  any fiscal  year will not  be reimbursed  by the  Fund
through  payments  accrued in  any subsequent  fiscal year.  For the  year ended
December 31, 1994, the distribution fee was accrued at the annual rate of 0.10%.

4.    SECURITY  TRANSACTIONS  AND  TRANSACTIONS  WITH  AFFILIATES--The  cost  of
purchases  and proceeds  from sales/maturities  of portfolio  securities for the
year  ended   December  31,   1994  aggregated   $88,491,375  and   $89,570,000,
respectively.

    Dean  Witter  Trust  Company, an  affiliate  of the  Investment  Manager and
Distributor, is the Fund's  transfer agent. At December  31, 1994, the Fund  had
transfer agent fees and expenses payable of approximately $4,100.

    On  April 1, 1991, the Fund  established an unfunded noncontributory defined
benefit pension plan covering all independent Trustees of the Fund who will have
served as  independent  Trustees  for  at  least  five  years  at  the  time  of
retirement.  Benefits  under  this  plan  are  based  on  years  of  service and
compensation during the last five years of service. Aggregate pension costs  for
the year ended December 31, 1994, included in Trustees' fees and expenses in the
Statement  of Operations amounted to $2,766. At  December 31, 1994, the Fund had
an accrued pension liability of $37,746 which is included in accrued expenses in
the Statement of Assets and Liabilities.

5.    SHARES  OF  BENEFICIAL  INTEREST--Transactions  in  shares  of  beneficial
interest, at $1.00 per share, were as follows:

<TABLE>
<CAPTION>
                                                                                 For the year ended  For the year ended
                                                                                 December 31, 1994   December 31, 1993
                                                                                 ------------------  ------------------
<S>                                                                              <C>                 <C>
Sold...........................................................................         101,653,911         122,306,064
Reinvestment of dividends......................................................             760,887             605,204
                                                                                 ------------------  ------------------
                                                                                        102,414,798         122,911,268
Repurchased....................................................................        (103,898,000)       (126,924,407)
                                                                                 ------------------  ------------------
Net decrease in shares outstanding.............................................          (1,483,202)         (4,013,139)
                                                                                 ------------------  ------------------
                                                                                 ------------------  ------------------
</TABLE>

6.   SELECTED PER SHARE DATA AND RATIOS--See the "Financial Highlights" table on
page 4 of this Prospectus.

                                       23
<PAGE>
DEAN WITTER NEW YORK MUNICIPAL MONEY MARKET TRUST

PORTFOLIO OF INVESTMENTS DECEMBER 31, 1994
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
   PRINCIPAL
  AMOUNT (IN                                                                                            CURRENT
  THOUSANDS)                                                                                             YIELD         VALUE
- ---------------                                                                                        ----------  -------------
<C>              <S>                                                                                   <C>         <C>
                 NEW YORK TAX-EXEMPT SHORT-TERM VARIABLE RATE MUNICIPAL OBLIGATIONS* (77.1%)
                 NEW YORK
   $   1,000     Babylon, Ser 1994 B, 4.70% due 1/4/95...............................................       4.70%  $   1,000,000
       2,000     Franklin County Industrial Development Agency, KES Chateaugay Ser 1991 A (AMT),
                   5.40% due 1/4/95..................................................................       5.40       2,000,000
                 New York City Cultural Resources Trust,
       1,500     Carnegie Hall Ser 1990, 5.00% due 1/4/95............................................       5.00       1,500,000
       1,600     Jewish Museum Ser 1992, 5.50% due 1/4/95............................................       5.50       1,600,000
       1,000     New York City Housing Development Corporation, Multi-family James Tower Dev 1994 Ser
                   A, 5.40% due 1/4/95...............................................................       5.40       1,000,000
                 New York City Industrial Development Agency,
         750     Composite Offrg I (AMT), 5.35% due 1/4/95...........................................       5.35         750,000
         950     Composite Offrg XXV 1990 Ser E (AMT), 5.35% due 1/4/95..............................       5.35         950,000
       1,900     The Berkeley Carroll School Ser 1993, 5.00% due 1/4/95..............................       5.00       1,900,000
       1,000     The Columbia Grammar & Preparatory School Ser 1994, 5.00% due 1/4/95................       5.00       1,000,000
       2,000     New York Local Government Assistance Corporation, Ser 1994 B, 5.20% due 1/4/95......       5.20       2,000,000
                 New York State Dormitory Authority,
       1,300     Metropolitan Museum of Art Ser A, 5.20% due 1/4/95..................................       5.20       1,300,000
       1,000     Oxford University Press Inc, 6.75% due 1/3/95.......................................       6.75       1,000,000
                 New York State Energy Research & Development Authority,
       2,100     Central Hudson Gas & Electric Corp Ser 1987 A (AMT), 4.80% due 1/5/95...............       4.80       2,100,000
       1,000     Long Island Lighting Co Ser 1985 A, 3.00% due 3/1/95................................       3.00       1,000,000
       1,000     Long Island Lighting Co Ser 1993 (AMT), 4.90% due 1/4/95............................       4.90       1,000,000
       1,000     New York State Medical Care Facilities Finance Agency, The Children's Hospital of
                   Buffalo 1991 Ser A, 5.35% due 1/4/95..............................................       5.35       1,000,000
       3,940     New York State Power Authority, Tender Notes, 3.80% due 3/1/95......................       3.80       3,940,000
       1,000     Port Authority of New York & New Jersey, KIAK Partners Special Proj Ser 3 (AMT),
                   5.35% due 1/4/95..................................................................       5.35       1,000,000
       2,500     Triborough Bridge & Tunnel Authority, Ser 1994 (FGIC Insured), 4.85% due 1/4/95.....       4.85       2,500,000
                                                                                                                   -------------
                                                                                                                      28,540,000
                                                                                                                   -------------
                 PUERTO RICO
       2,000     Puerto Rico Highway & Transportation Authority, Ser X, 5.00% due 1/4/95.............       5.00       2,000,000
                                                                                                                   -------------
                 TOTAL NEW YORK TAX-EXEMPT SHORT-TERM VARIABLE RATE MUNICIPAL OBLIGATIONS (AMORTIZED COST
                   $30,540,000)..................................................................................     30,540,000
                                                                                                                   -------------
</TABLE>

<TABLE>
<CAPTION>
                                                                                                    YIELD TO
                                                                                                    MATURITY
                                                                                                   ON DATE OF
                                                                                                    PURCHASE        VALUE
                                                                                                   -----------  -------------
<C>          <S>                                                                                   <C>          <C>
             NEW YORK TAX-EXEMPT COMMERCIAL PAPER (12.4%)
             NEW YORK
       800   New York City Municipal Water Finance Authority, Ser 1994, 3.75% due 2/8/95.........       3.75          800,000
     1,200   New York State, Ser P BANs, 3.75% due 2/14/95.......................................       3.75        1,200,000
 $   1,000   New York State Energy Research & Development Authority, New York State Electric &
               Gas Corp Ser 1994 B, 4.00% due 1/31/95............................................       4.00%   $   1,000,000
</TABLE>

                                       24
<PAGE>
DEAN WITTER NEW YORK MUNICIPAL MONEY MARKET TRUST

PORTFOLIO OF INVESTMENTS DECEMBER 31, 1994 (CONTINUED)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                                                    YIELD TO
 PRINCIPAL                                                                                          MATURITY
AMOUNT (IN                                                                                         ON DATE OF
THOUSANDS)                                                                                          PURCHASE        VALUE
- -----------                                                                                        -----------  -------------
<C>          <S>                                                                                   <C>          <C>
     1,135   Port Authority of New York & New Jersey, Ser 2 (AMT), 3.75% due 2/16/95.............       3.75        1,135,000
                                                                                                                -------------
                                                                                                                    4,135,000
                                                                                                                -------------
             PUERTO RICO
       800   Puerto Rico Maritime Shipping Authority, Ser A, 4.80% due 1/11/95...................       4.80          800,000
                                                                                                                -------------
             TOTAL NEW YORK TAX-EXEMPT COMMERCIAL PAPER
               (AMORTIZED COST $4,935,000)....................................................................      4,935,000
                                                                                                                -------------
             NEW YORK TAX-EXEMPT SHORT-TERM MUNICIPAL NOTES (11.4%)
     1,000   Erie County, 1994 RANs, dtd 8/16/94 4.75% due 8/15/95...............................       4.00        1,004,484
     1,000   Monroe County, Ser 1994 RANs, dtd 7/28/94 4.25% due 2/28/95.........................       3.55        1,001,098
     1,500   Smithtown, Central School District 1994-95 TANs, dtd 6/23/94 4.00% due 6/23/95......       3.60        1,502,760
     1,000   Suffolk County, 1994 TANs, dtd 9/22/94 4.50% due 9/14/95............................       4.10        1,002,836
                                                                                                                -------------
             TOTAL NEW YORK TAX-EXEMPT SHORT-TERM MUNICIPAL NOTES (AMORTIZED COST $4,511,178).................
                                                                                                                    4,511,178
                                                                                                                -------------
TOTAL INVESTMENTS (AMORTIZED COST $39,986,178) (A)............................      100.9%    39,986,178
LIABILITIES IN EXCESS OF CASH AND OTHER ASSETS................................       (0.9)      (357,299)
                                                                                ----------  ------------
NET ASSETS....................................................................      100.0%  $ 39,628,879
                                                                                ----------  ------------
                                                                                ----------  ------------
<FN>
- ----------------
AMT  ALTERNATIVE MINIMUM TAX.
BANS BOND ANTICIPATION NOTES.
RANS REVENUE ANTICIPATION NOTES.
TANS TAX ANTICIPATION NOTES.
 *   THE DUE DATE REFLECTS THE NEXT RATE CHANGE.
(A)  COST IS THE SAME FOR FEDERAL INCOME TAX PURPOSES.
</TABLE>

                       SEE NOTES TO FINANCIAL STATEMENTS

                                       25
<PAGE>
DEAN WITTER NEW YORK MUNICIPAL MONEY MARKET TRUST
REPORT OF INDEPENDENT ACCOUNTANTS
- --------------------------------------------------------------------------------

To the Shareholders and Trustees of Dean Witter New York Municipal Money Market
Trust

In  our opinion, the accompanying statement of assets and liabilities, including
the portfolio of investments,  and the related statements  of operations and  of
changes  in net assets and the financial highlights (appearing in the "Financial
Highlights" table on page 4 of this Prospectus) present fairly, in all  material
respects,  the financial position of Dean Witter New York Municipal Money Market
Trust (the "Fund") at December 31, 1994,  the results of its operations for  the
year  then ended, the changes in its net assets for each of the two years in the
period then ended and the financial highlights for each of the four years in the
period then ended and for the period March 20, 1990 (commencement of operations)
through December  31, 1990,  in conformity  with generally  accepted  accounting
principles.  These  financial  statements  and  financial  highlights (hereafter
referred to  as "financial  statements") are  the responsibility  of the  Fund's
management;  our  responsibility is  to express  an  opinion on  these financial
statements based  on our  audits. We  conducted our  audits of  these  financial
statements  in  accordance  with  generally  accepted  auditing  standards which
require that we plan and perform the audit to obtain reasonable assurance  about
whether  the financial  statements are free  of material  misstatement. An audit
includes examining,  on  a  test  basis, evidence  supporting  the  amounts  and
disclosures  in the  financial statements,  assessing the  accounting principles
used and significant estimates  made by management,  and evaluating the  overall
financial  statement presentation.  We believe  that our  audits, which included
confirmation of securities owned at December 31, 1994 by correspondence with the
custodian, provide a reasonable basis for the opinion expressed above.

PRICE WATERHOUSE LLP
New York, New York
February 13, 1995

                      1994 FEDERAL TAX NOTICE (UNAUDITED)

 During the year  ended December 31,  1994, the Fund  paid to the  shareholders
 $0.017694  per share from  net investment income. All  of the Fund's dividends
 from net investment  income were  exempt interest  dividends, excludable  from
 gross income for Federal and New York income tax purposes.

                                       26
<PAGE>
                        THE DEAN WITTER FAMILY OF FUNDS

MONEY MARKET FUNDS                       DEAN WITTER RETIREMENT SERIES
Dean Witter Liquid Asset Fund Inc.       Liquid Asset Series
Dean Witter Tax-Free Daily Income Trust  U.S. Government Money Market Series
Dean Witter New York Municipal Money     U.S. Government Securities Series
Market Trust                             Intermediate Income Securities Series
Dean Witter California Tax-Free Daily    American Value Series
Income Trust                             Capital Growth Series
Dean Witter U.S. Government Money        Dividend Growth Series
Market Trust                             Strategist Series
EQUITY FUNDS                             Utilities Series
Dean Witter American Value Fund          Value-Added Market Series
Dean Witter Natural Resource             Global Equity Series
Development Securities Inc.              ASSET ALLOCATION FUNDS
Dean Witter Dividend Growth Securities   Dean Witter Managed Assets Trust
Inc.                                     Dean Witter Strategist Fund
Dean Witter Developing Growth            Dean Witter Global Asset Allocation
Securities Trust                         Fund
Dean Witter World Wide Investment Trust  ACTIVE ASSETS ACCOUNT PROGRAM
Dean Witter Value-Added Market Series    Active Assets Money Trust
Dean Witter Utilities Fund               Active Assets Tax-Free Trust
Dean Witter Capital Growth Securities    Active Assets California Tax-Free Trust
Dean Witter European Growth Fund Inc.    Active Assets Government Securities
Dean Witter Precious Metals and          Trust
Minerals Trust
Dean Witter Pacific Growth Fund Inc.
Dean Witter Health Sciences Trust
Dean Witter Global Dividend Growth
Securities
Dean Witter Global Utilities Fund
Dean Witter International SmallCap Fund
Dean Witter Mid-Cap Growth Fund
FIXED-INCOME FUNDS
Dean Witter High Yield Securities Inc.
Dean Witter Tax-Exempt Securities Trust
Dean Witter U.S. Government Securities
Trust
Dean Witter California Tax-Free Income
Fund
Dean Witter New York Tax-Free Income
Fund
Dean Witter Convertible Securities
Trust
Dean Witter Federal Securities Trust
Dean Witter World Wide Income Trust
Dean Witter Intermediate Income
Securities
Dean Witter Global Short-Term Income
Fund Inc.
Dean Witter Multi-State Municipal
Series Trust
Dean Witter Premier Income Trust
Dean Witter Short-Term U.S. Treasury
Trust
Dean Witter Diversified Income Trust
Dean Witter Limited Term Municipal
Trust
Dean Witter Short-Term Bond Fund
Dean Witter National Municipal Trust
Dean Witter High Income Securities

<PAGE>

   
Dean Witter New York
Municipal Money Market Trust
                                    Dean Witter
Two World Trade Center
New York, New York 10048
BOARD OF TRUSTEES                   New York
Jack F. Bennett                     Municipal
Michael Bozic                       Money Market
Charles A. Fiumefreddo              Trust
Edwin J. Garn
John R. Haire
Dr. Manuel H. Johnson
Paul Kolton
Michael E. Nugent
Philip J. Purcell
John L. Schroeder
OFFICERS
Charles A. Fiumefreddo
Chairman and Chief Executive
Officer
Sheldon Curtis
Vice President, Secretary and
General Counsel
Katherine H. Stromberg
Vice President
Thomas F. Caloia
Treasurer
CUSTODIAN
The Bank of New York
90 Washington Street
New York, New York 10286
TRANSFER AGENT AND DIVIDEND
DISBURSING AGENT
Dean Witter Trust Company
Harborside Financial Center, Plaza
Two,
Jersey City, New Jersey 07311
INDEPENDENT ACCOUNTANTS
Price Waterhouse LLP
1177 Avenue of the Americas
New York, New York 10036
INVESTMENT MANAGER
Dean Witter InterCapital Inc.
                                    PROSPECTUS -- FEBRUARY 24, 1995

    


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