MORGAN STANLEY DEAN WITTER NEW YORK QUALITY MUNICIPAL SECURI
N-30D, 2000-06-22
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<PAGE>   1

<TABLE>
<S>                                                             <C>
MORGAN STANLEY DEAN WITTER NEW YORK QUALITY MUNICIPAL SECURITIES   Two World Trade Center

LETTER TO THE SHAREHOLDERS April 30, 2000                        New York, New York 10048
</TABLE>

DEAR SHAREHOLDER:

The U.S. economy continued its unprecedented expansion into the new year. Strong
growth pushed the unemployment rate to a 30-year low. Rising commodity prices
heightened concern about inflation. The price of oil moved above $30 per barrel
prior to ending April at $25 per barrel. Between June 1999 and March 2000, the
Federal Reserve Board raised the federal funds rate in five, 25 basis-point
moves to reach 6.00 percent. The Fed subsequently demonstrated its resistance to
inflation by raising the federal funds rate another 50 basis points to 6.50
percent in May. Economic growth and a less accommodative monetary policy caused
long-term interest rates to increase throughout 1999. In February, the U.S.
Treasury announced plans to retire debt with the federal budget surplus. This
precipitated a 50-75 basis-point rally in longer Treasury maturities.

MUNICIPAL MARKET CONDITIONS

The long-term insured municipal index began 1999 near a record low yield of 5.05
percent but increased to 5.97 percent by calendar year-end. This index reached a
high of 6.18 percent in January 2000 before ending April at 5.93 percent.
Because bond prices move inversely to changes in interest rates, higher yields
caused bond prices to decline significantly last year and improve modestly in
the first four months of 2000.

The ratio of municipal yields as a percentage of Treasury yields has been used
historically as a measure of relative value. Over the past five years the ratio
has ranged between an average high of 93 percent and an average low of 85
percent. The increase in the ratio from 92 percent at the end of 1999 to 99
percent at the end of April 2000 was primarily the result of the magnitude of
the rally in long Treasuries. A rising yield ratio indicates weaker relative
performance by municipals.

Higher interest rates reduced municipal market underwriting in 1999. New-issue
volume declined 20 percent last year. Refunding activity, the most
interest-rate-sensitive component of supply, was down more than
<PAGE>   2

MORGAN STANLEY DEAN WITTER NEW YORK QUALITY MUNICIPAL SECURITIES

LETTER TO THE SHAREHOLDERS April 30, 2000, continued

50 percent. In the first four months of this year, volume was 30 percent lower
than in the same period last year.

                        30-YEAR BOND YIELDS 1994 - 2000

<TABLE>
<CAPTION>
       30-Year Insured               30-Year U.S.                 Insured Municipal Yields as a
       Municipal Yields            Treasury Yields             Percentage of U.S. Treasury Yields
<S>        <C>                          <C>                                 <C>
1994       5.40%                        6.34%                               85.17%
           5.40                         6.24                                86.54
           5.80                         6.66                                87.09
           6.40                         7.09                                90.27
           6.35                         7.32                                86.75
           6.25                         7.43                                84.12
           6.50                         7.61                                85.41
           6.25                         7.39                                84.57
           6.30                         7.45                                84.56
           6.55                         7.81                                83.87
           6.75                         7.96                                84.80
           7.00                         8.00                                87.50
           6.75                         7.88                                85.66
1995       6.40                         7.70                                83.12
           6.15                         7.44                                82.66
           6.15                         7.43                                82.77
           6.20                         7.34                                84.47
           5.80                         6.66                                87.09
           6.10                         6.62                                92.15
           6.10                         6.86                                88.92
           6.00                         6.66                                90.09
           5.95                         6.48                                91.82
           5.75                         6.33                                90.84
           5.50                         6.14                                89.58
           5.35                         5.94                                90.07
1996       5.40                         6.03                                89.55
           5.60                         6.46                                86.69
           5.85                         6.66                                87.84
           5.95                         6.89                                86.36
           6.05                         6.99                                86.55
           5.90                         6.89                                85.63
           5.85                         6.97                                83.93
           5.90                         7.11                                82.98
           5.70                         6.93                                82.25
           5.65                         6.64                                85.09
           5.50                         6.35                                86.61
           5.60                         6.63                                84.46
1997       5.70                         6.79                                83.95
           5.65                         6.80                                83.09
           5.90                         7.10                                83.10
           5.75                         6.94                                82.85
           5.65                         6.91                                81.77
           5.60                         6.78                                82.60
           5.30                         6.30                                84.13
           5.50                         6.61                                83.21
           5.40                         6.40                                84.38
           5.35                         6.15                                86.99
           5.30                         6.05                                87.60
           5.15                         5.92                                86.99
1998       5.15                         5.80                                88.79
           5.20                         5.92                                87.84
           5.25                         5.93                                88.53
           5.35                         5.95                                89.92
           5.20                         5.80                                89.66
           5.20                         5.65                                92.04
           5.18                         5.71                                90.72
           5.03                         5.27                                95.45
           4.95                         5.00                                99.00
           5.05                         5.16                                97.87
           5.00                         5.06                                98.81
           5.05                         5.10                                99.02
1999       5.00                         5.09                                98.23
           5.10                         5.58                                91.40
           5.15                         5.63                                91.47
           5.20                         5.66                                91.87
           5.30                         5.83                                90.91
           5.47                         5.96                                91.78
           5.55                         6.10                                90.98
           5.75                         6.06                                94.88
           5.85                         6.05                                96.69
           6.03                         6.16                                97.90
           6.00                         6.29                                95.39
           5.97                         6.48                                92.13
2000       6.18                         6.49                                95.22
           6.04                         6.14                                98.37
           5.82                         5.83                                99.83
           5.91                         5.96                                99.16

Source: Municipal Market Data - A Division of Thomson Financial Municipal and Bloomberg L.P.
</TABLE>

PERFORMANCE

During the six-month period ended April 30, 2000, the net asset value (NAV) of
Morgan Stanley Dean Witter New York Quality Municipal Securities (IQN) increased
from $13.03 to $13.16 per share. Based on this change, plus a reinvestment of
tax-free dividends totaling $0.39 per share, the Trust's total NAV return was
4.27 percent. IQN's value on the New York Stock Exchange (NYSE) decreased from
$12.3125 to $12.1875 per share during this period. Based on this change plus
reinvestment of tax-free dividends, IQN's total market return was 2.20 percent.
On April 30, 2000, IQN's share price was at a 7.39 percent discount to its NAV.

Monthly dividends for the second quarter of 2000, declared in March, were
unchanged at $0.065 per share. The Trust's level of undistributed net investment
income was $0.07 per share on April 30, 2000, versus $0.10 per share six months
earlier.

                                       2
<PAGE>   3

MORGAN STANLEY DEAN WITTER NEW YORK QUALITY MUNICIPAL SECURITIES

LETTER TO THE SHAREHOLDERS April 30, 2000, continued

PORTFOLIO STRUCTURE

The Trust's investments were diversified among 12 long-term sectors and 30
credits. At the end of April, the portfolio's average maturity was 18 years.
Average duration, a measure of sensitivity to interest rate changes, was 10.1
years. Current information on the portfolio's credit ratings and sector
distribution is provided in the accompanying charts and tables. Optional call
provisions and with their respective cost (book) yields are also shown.

THE IMPACT OF LEVERAGING

As discussed in previous shareholder reports, the total income available for
distribution to common shareholders includes incremental income provided by the
Trust's outstanding Auction Rate Preferred shares (ARPS). ARPS dividends reflect
prevailing short-term interest rates on maturities normally ranging from one
week to one year. Incremental income to common shareholders depends on two
factors. The first factor is the amount of ARPS outstanding, while the second is
the spread between the portfolio's cost yield and ARPS expenses (ARPS auction
rate and expenses). The greater the spread and amount of ARPS outstanding, the
greater the amount of incremental income available for distribution to common
shareholders. The level of net investment income available for distribution to
common shareholders varies with the level of short-term interest rates. ARPS
leverage also increases the price volatility of common shares and has the effect
of extending portfolio duration.

During the six month period, ARPS leverage contributed approximately $0.02 per
share to common share earnings. Weekly ARPS yields ranged between 2.00 percent
and 5.75 percent. In comparison, the yield on 1-year municipal notes increased
from 3.77 percent at the end of October 1999 to 4.23 percent at the end of
April. The Trust's Two ARPS series totaling $24 million represented 27 percent
of net assets.

LOOKING AHEAD

The Federal Reserve Board has expressed concern about consumer wealth and rising
prices. We anticipate that the central bank will continue to increase short-term
interest rates in an effort to slow the economy. We believe municipal bonds
continue to offer tax-conscious investors good long-term value.

The Trust's procedure for reinvestment of all dividends and distributions on
common shares is through purchases in the open market. This method helps support
the market value of the Trust's shares. In

                                       3
<PAGE>   4

MORGAN STANLEY DEAN WITTER NEW YORK QUALITY MUNICIPAL SECURITIES

LETTER TO THE SHAREHOLDERS April 30, 2000, continued

addition, we would like to remind you that the Trustees have approved a
procedure whereby the Trust may, when appropriate, purchase shares in the open
market or in privately negotiated transactions at a price not above market value
or net asset value, which ever is lower at the time of purchase. The Trust may
also utilize procedures to reduce or eliminate the amount of outstanding ARPS,
including their purchase in the open market or in privately negotiated
transactions. During the six-month period ended April 30, 2000, the Trust
purchased and retired 1.6 percent of its common stock (78,600 shares) at a
weighted average market discount of 6.63 percent. The anti-dilutive effect of
acquiring treasury shares is reported in the table of Financial Highlights on
page 17.

We appreciate your ongoing support of Morgan Stanley Dean Witter New York
Quality Municipal Securities and look forward to continuing to serve your
investment needs.

Very truly yours,

/S/ CHARLES A. FIUMEFREDDO                     /S/ MITCHELL M. MERIN
CHARLES A. FIUMEFREDDO                         MITCHELL M. MERIN
Chairman of the Board                          President

                                       4
<PAGE>   5

MORGAN STANLEY DEAN WITTER NEW YORK QUALITY MUNICIPAL SECURITIES

LETTER TO THE SHAREHOLDERS April 30, 2000, continued


<TABLE>
<CAPTION>
LARGEST SECTORS AS OF APRIL 30, 2000 (% OF NET ASSETS)

<S>                                                               <C>
HOSPITAL                                                          15%
EDUCATION                                                         13%
GENERAL OBLIGATION                                                11%
MORTGAGE                                                           9%
NURSING & HEALTH                                                   9%
TRANSPORTATION                                                     9%
IDR/PCR*                                                           8%
ELECTRIC                                                           7%
PUBLIC FACILITIES                                                  7%

* INDUSTRIAL DEVELOPMENT/POLLUTION CONTROL REVENUE

  PORTFOLIO STRUCTURE IS SUBJECT TO CHANGE.
</TABLE>



<TABLE>
<CAPTION>
CREDIT RATINGS AS OF APRIL 30, 2000
(% OF TOTAL LONG-TERM PORTFOLIO)
<S>                                   <C>                      <C>
               Aaa OR AAA             Aa OR AA                 A OR A
                   28%                   26%                     46%
</TABLE>
AS MEASURED BY MOODY'S INVESTORS SERVICE, INC. OR
STANDARD & POOR'S CORP.

PORTFOLIO STRUCTURE IS SUBJECT TO CHANGE.


                                       5
<PAGE>   6

MORGAN STANLEY DEAN WITTER NEW YORK QUALITY MUNICIPAL SECURITIES

LETTER TO THE SHAREHOLDERS April 30, 2000, continued

                      Call and Cost (Book) Yield Structure
                                 April 30, 2000


                                  [BAR GRAPH]
WEIGHTED AVERAGE
CALL PROTECTION: 6 YEARS

<TABLE>
<CAPTION>
YEARS BONDS CALLABLE                      PERCENT CALLABLE*
--------------------                      ----------------
<S>                                       <C>
        2001                                      0%
        2002                                      0%
        2003                                     46%
        2004                                     22%
        2005                                      1%
        2006                                      2%
        2007                                      0%
        2008                                     16%
        2009                                      6%
        2010+                                     7%
</TABLE>

WEIGHTED AVERAGE
BOOK YIELD: 5.59%
                                  [BAR GRAPH]
<TABLE>
<CAPTION>
YEARS BONDS CALLABLE                  COST (BOOK) YIELD **
--------------------                  --------------------
<S>                                  <C>
        2001                                 0.00%
        2002                                 0.00%
        2003                                 5.70%
        2004                                 5.60%
        2005                                 6.10%
        2006                                 6.90%
        2007                                 0.00%
        2008                                 5.40%
        2009                                 5.40%
        2010+                                5.30%
</TABLE>

*  % Based on Long-Term Portfolio.

** Cost or "book" yield is the annual income earned on a portfolio investment
   based on its original purchase price before Trust operating expenses. For
   example, the Trust earned a book yield of 5.6% on 22% of the long-term
   portfolio that are callable in 2004.
   Portfolio structure is subject to change.



                                       6
<PAGE>   7

MORGAN STANLEY DEAN WITTER NEW YORK QUALITY MUNICIPAL SECURITIES

PORTFOLIO OF INVESTMENTS April 30, 2000 (unaudited)

<TABLE>
<CAPTION>
PRINCIPAL
AMOUNT IN                                                                 COUPON   MATURITY
THOUSANDS                                                                  RATE      DATE         VALUE
----------------------------------------------------------------------------------------------------------
<C>         <S>                                                           <C>      <C>         <C>
            NEW YORK TAX-EXEMPT MUNICIPAL BONDS (97.5%)
            General Obligation (11.2%)
            New York City,
 $ 3,000     1994 Ser C.................................................  5.50 %   10/01/08    $ 3,018,000
   4,000     1994 Ser D.................................................  5.75     08/15/09      4,059,720
            Puerto Rico,
   1,000     Public Improvement Ser 1999................................  5.25     07/01/16        961,970
   2,000     Public Improvement Refg Ser 1993...........................  5.25     07/01/18      1,866,620
 -------                                                                                       -----------
  10,000                                                                                         9,906,310
 -------                                                                                       -----------

            Educational Facilities Revenue (13.0%)
            New York State Dormitory Authority,
   4,000     City University Ser 1993 F.................................  5.50     07/01/12      3,933,520
   1,000     Ithaca College Ser 1998 (AMBAC)............................  5.00     07/01/21        878,740
   5,000     State University Ser 1993 C................................  5.375    05/15/13      4,869,600
   2,000     University of Rochester Ser 1998 A (MBIA)..................  5.00     07/01/18      1,794,620
 -------                                                                                       -----------
  12,000                                                                                        11,476,480
 -------                                                                                       -----------

            Electric Revenue (6.8%)
   3,000    Long Island Power Authority, Ser 1998 A (FSA)...............  5.125    12/01/22      2,657,100
   4,000    Puerto Rico Electric Power Authority, Power Ser DD (FSA)....  4.50     07/01/19      3,357,760
 -------                                                                                       -----------
   7,000                                                                                         6,014,860
 -------                                                                                       -----------

            Hospital Revenue (15.3%)
   2,000    New York State Dormitory Authority, Rochester General
             Hospital - FHA Insured Mtge Ser 1993.......................  5.70     08/01/33      1,889,120
            New York State Medical Care Facilities Finance Agency,
   3,170     Hospital & Nursing Home - FHA Insured Mtge 1993 Ser B......  5.50     02/15/22      3,083,364
   3,000     Hospital & Nursing Home - FHA Insured Mtge 1993 Ser A......  5.90     08/15/33      2,895,600
   4,000     Presbyterian Hospital - FHA Insured Mtge Ser 1994 A........  5.25     08/15/14      3,830,800
   2,000     St Lukes - Roosevelt Hospital - FHA Insured Mtge Ser A.....  5.625    08/15/18      1,936,580
 -------                                                                                       -----------
  14,170                                                                                        13,635,464
 -------                                                                                       -----------

            Industrial Development/Pollution Control Revenue (7.5%)
            New York State Energy Research & Development Authority,
   3,000     Brooklyn Union Gas Co 1991 Ser A & B.......................  6.368    04/01/20      3,063,510
   1,000     Consolidated Edison Co of New York Inc Refg Ser 1993-B.....  5.25     08/15/20        898,500
   3,000     New York State Electric & Gas Co Ser A (AMT)...............  5.95     12/01/27      2,694,300
 -------                                                                                       -----------
   7,000                                                                                         6,656,310
 -------                                                                                       -----------

            Mortgage Revenue - Multi-Family (5.5%)
   3,000    New York City Housing Development Corporation, FHA Ins Mtge
             Ser 1993-B.................................................  5.85     05/01/26      2,887,680
</TABLE>


                       SEE NOTES TO FINANCIAL STATEMENTS

                                       7
<PAGE>   8

MORGAN STANLEY DEAN WITTER NEW YORK QUALITY MUNICIPAL SECURITIES

PORTFOLIO OF INVESTMENTS April 30, 2000 (unaudited) continued

<TABLE>
<CAPTION>
PRINCIPAL
AMOUNT IN                                                                 COUPON   MATURITY
THOUSANDS                                                                  RATE      DATE         VALUE
----------------------------------------------------------------------------------------------------------
<C>         <S>                                                           <C>      <C>         <C>
 $ 1,975    New York State Housing Finance Agency, 1996 Ser A Refg
             (FSA)......................................................  6.10 %   11/01/15    $ 2,016,317
 -------                                                                                       -----------
   4,975                                                                                         4,903,997
 -------                                                                                       -----------

            Mortgage Revenue - Single Family (3.7%)
   3,485    New York State Mortgage Agency, Homeowner Ser 29 A..........  5.25     04/01/15      3,321,902
 -------                                                                                       -----------

            Nursing & Health Related Facilities Revenue (9.2%)
            New York State Dormitory Authority,
   2,990     Department of Health Ser 1993..............................  5.70     07/01/09      3,014,458
   1,750     Mental Health Refg Ser 1999 C (MBIA).......................  4.75     08/15/22      1,462,125
            New York Medical Care Facilities Finance Agency,
   2,000     Mental Health 1993 Ser F...................................  5.375    02/15/14      1,901,640
   2,000     Mental Health 1993 Ser D...................................  5.25     08/15/23      1,749,460
 -------                                                                                       -----------
   8,740                                                                                         8,127,683
 -------                                                                                       -----------

            Public Facilities Revenue (6.6%)
   4,000    New York State Dormitory Authority, Court Facilities Ser
             1993 A.....................................................  5.625    05/15/13      3,907,840
   2,000    New York State Urban Development Corporation, Correctional
             1998 Ser B (AMBAC).........................................  5.25     01/01/16      1,899,420
 -------                                                                                       -----------
   6,000                                                                                         5,807,260
 -------                                                                                       -----------

            Transportation Facilities Revenue (9.3%)
   1,000    Buffalo & Fort Erie Public Bridge Authority, Toll Bridge Ser
             1995 (MBIA)................................................  5.75     01/01/25        976,730
            New York State Thruway Authority,
   2,000     Local Hwy & Bridge Ser 1993................................  5.125    04/01/08      1,957,280
   1,000     Local Hwy & Bridge Ser 2000 A (FSA)........................  5.75     04/01/17      1,005,090
   3,000    Triborough Bridge & Tunnel Authority, Ser 1993 B............  5.00     01/01/20      2,694,330
   2,000    Puerto Rico Highway & Transportation Authority, 1998 Ser
             A..........................................................  4.75     07/01/38      1,596,960
 -------                                                                                       -----------
   9,000                                                                                         8,230,390
 -------                                                                                       -----------

            Water & Sewer Revenue (4.0%)
            New York City Municipal Water Finance Authority,
   2,000     1994 Ser B.................................................  5.50     06/15/19      1,907,740
   2,000     1999 Ser A (FGIC)..........................................  4.75     06/15/31      1,624,240
 -------                                                                                       -----------
   4,000                                                                                         3,531,980
 -------                                                                                       -----------

            Other Revenue (5.4%)
   2,000    New York City Transitional Finance Authority, 2000 Ser A....  5.75     08/15/24      1,958,800
   3,000    New York Local Government Assistance Corporation, Ser 1993 B
             Refg.......................................................  5.50     04/01/21      2,849,790
 -------                                                                                       -----------
   5,000                                                                                         4,808,590
 -------                                                                                       -----------

  91,370    TOTAL NEW YORK TAX-EXEMPT MUNICIPAL BONDS (Identified Cost $89,645,779).........    86,421,226
 -------                                                                                       -----------
</TABLE>


                       SEE NOTES TO FINANCIAL STATEMENTS

                                       8
<PAGE>   9

MORGAN STANLEY DEAN WITTER NEW YORK QUALITY MUNICIPAL SECURITIES

PORTFOLIO OF INVESTMENTS April 30, 2000 (unaudited) continued

<TABLE>
<CAPTION>
PRINCIPAL
AMOUNT IN                                                                 COUPON   MATURITY
THOUSANDS                                                                  RATE      DATE         VALUE
----------------------------------------------------------------------------------------------------------
<S>         <C>                                                           <C>      <C>         <C>
            NEW YORK TAX-EXEMPT SHORT-TERM MUNICIPAL OBLIGATION (0.9%)
 $   800    New York State Dormitory Authority, Cornell University Ser
 -------     1990 B (Demand 05/01/00) (Identified Cost $800,000)........  5.75*%   07/01/25    $   800,000
                                                                                               -----------

 $92,170    TOTAL INVESTMENTS (Identified Cost $90,445,779)(a)....................     98.4%    87,221,226
 =======

            OTHER ASSETS IN EXCESS OF LIABILITIES...................................     1.6     1,407,200
                                                                                      ------   -----------

            NET ASSETS.............................................................   100.0%   $88,628,426
                                                                                      ======   ===========
</TABLE>

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

<TABLE>
<C>    <S>
 AMT   Alternative Minimum Tax.
  *    Current coupon of variable rate demand obligation.
 (a)   The aggregate cost for federal income tax purposes
       approximates identified cost. The aggregate gross unrealized
       appreciation is $363,951 and the aggregate gross unrealized
       depreciation is $3,588,504, resulting in net unrealized
       depreciation of $3,224,553.

Bond Insurance:
-------------------------------------------------------------------
AMBAC  AMBAC Assurance Corporation.
FGIC   Financial Guaranty Insurance Company.
 FSA   Financial Security Assurance Inc.
MBIA   Municipal Bond Investors Assurance Corporation.
</TABLE>


                       SEE NOTES TO FINANCIAL STATEMENTS

                                       9
<PAGE>   10

MORGAN STANLEY DEAN WITTER NEW YORK QUALITY MUNICIPAL SECURITIES

FINANCIAL STATEMENTS

<TABLE>
<S>                                                           <C>
STATEMENT OF ASSETS AND LIABILITIES
April 30, 2000 (unaudited)
ASSETS:
Investments in securities, at value
 (identified cost $90,445,779)..............................  $87,221,226
Cash........................................................       41,463
Interest receivable.........................................    1,433,660
Prepaid expenses............................................       27,861
                                                              -----------

    TOTAL ASSETS............................................   88,724,210
                                                              -----------

LIABILITIES:
Payable for:
    Investment management fee...............................       25,876
    Shares of beneficial interest repurchased...............        1,222
Accrued expenses............................................       68,686
                                                              -----------

    TOTAL LIABILITIES.......................................       95,784
                                                              -----------

    NET ASSETS..............................................  $88,628,426
                                                              ===========

COMPOSITION OF NET ASSETS:
Preferred shares of beneficial interest (1,000,000 shares
 authorized of non-participating $.01 par value, 480 shares
 outstanding)...............................................  $24,000,000
                                                              -----------
Common shares of beneficial interest (unlimited shares
 authorized of $.01 par value, 4,909,913 shares
 outstanding)...............................................   70,066,563
Net unrealized depreciation.................................   (3,224,553)
Accumulated undistributed net investment income.............      328,645
Accumulated net realized loss...............................   (2,542,229)
                                                              -----------

    NET ASSETS APPLICABLE TO COMMON SHAREHOLDERS............   64,628,426
                                                              -----------

    TOTAL NET ASSETS........................................  $88,628,426
                                                              ===========

NET ASSET VALUE PER COMMON SHARE
 ($64,628,426 divided by 4,909,913 common shares
 outstanding)...............................................       $13.16
                                                              ===========
</TABLE>


                       SEE NOTES TO FINANCIAL STATEMENTS

                                       10
<PAGE>   11

MORGAN STANLEY DEAN WITTER NEW YORK QUALITY MUNICIPAL SECURITIES

FINANCIAL STATEMENTS continued

<TABLE>
<S>                                                           <C>
STATEMENT OF OPERATIONS
For the six months ended April 30, 2000 (unaudited)
NET INVESTMENT INCOME:
INTEREST INCOME.............................................  $2,505,913
                                                              ----------

EXPENSES
Investment management fee...................................     154,814
Professional fees...........................................      54,706
Auction commission fees.....................................      30,866
Auction agent fees..........................................      11,749
Transfer agent fees and expenses............................      11,093
Registration fees...........................................       8,186
Trustees' fees and expenses.................................       6,178
Shareholder reports and notices.............................       5,622
Custodian fees..............................................       3,416
Other.......................................................       8,353
                                                              ----------
    TOTAL EXPENSES..........................................     294,983

Less: expense offset........................................      (3,405)
                                                              ----------

    NET EXPENSES............................................     291,578
                                                              ----------

    NET INVESTMENT INCOME...................................   2,214,335
                                                              ----------
NET REALIZED AND UNREALIZED GAIN (LOSS):
Net realized loss...........................................    (199,073)
Net change in unrealized depreciation.......................     940,504
                                                              ----------

    NET GAIN................................................     741,431
                                                              ----------

NET INCREASE................................................  $2,955,766
                                                              ==========
</TABLE>


                       SEE NOTES TO FINANCIAL STATEMENTS

                                       11
<PAGE>   12

MORGAN STANLEY DEAN WITTER NEW YORK QUALITY MUNICIPAL SECURITIES

FINANCIAL STATEMENTS continued

<TABLE>
<CAPTION>
STATEMENT OF CHANGES IN NET ASSETS
                                                       FOR THE SIX
                                                       MONTHS ENDED   FOR THE YEAR
                                                        APRIL 30,         ENDED
                                                          2000        OCTOBER 31, 1999
--------------------------------------------------------------------------------------
                                                       (unaudited)

<S>                                                    <C>            <C>
INCREASE (DECREASE) IN NET ASSETS:
OPERATIONS:
Net investment income................................  $ 2,214,335      $ 4,436,173
Net realized gain (loss).............................     (199,073)         284,493
Net change in unrealized depreciation................      940,504       (8,810,577)
                                                       -----------      -----------

    NET INCREASE (DECREASE)..........................    2,955,766       (4,089,911)
                                                       -----------      -----------

DIVIDENDS TO SHAREHOLDERS FROM NET INVESTMENT INCOME:
Preferred............................................     (447,027)        (766,540)
Common...............................................   (1,929,464)      (3,812,064)
                                                       -----------      -----------

    TOTAL DIVIDENDS..................................   (2,376,491)      (4,578,604)
                                                       -----------      -----------
Decrease from transactions in common shares of
 beneficial interest.................................     (954,558)      (1,190,074)
                                                       -----------      -----------

    NET DECREASE.....................................     (375,283)      (9,858,589)

NET ASSETS:
Beginning of period..................................   89,003,709       98,862,298
                                                       -----------      -----------
    END OF PERIOD
    (Including undistributed net investment income of
    $328,645 and $490,801, respectively).............  $88,628,426      $89,003,709
                                                       ===========      ===========
</TABLE>


                       SEE NOTES TO FINANCIAL STATEMENTS

                                       12
<PAGE>   13

MORGAN STANLEY DEAN WITTER NEW YORK QUALITY MUNICIPAL SECURITIES

NOTES TO FINANCIAL STATEMENTS April 30, 2000 (unaudited)

1. ORGANIZATION AND ACCOUNTING POLICIES

Morgan Stanley Dean Witter New York Quality Municipal Securities (the "Trust")
is registered under the Investment Company Act of 1940, as amended, as a
non-diversified, closed-end management investment company. The Trust's
investment objective is to provide current income which is exempt from federal,
New York State and New York City income taxes. The Trust was organized as a
Massachusetts business trust on March 3, 1993 and commenced operations on
September 29, 1993.

The preparation of financial statements in accordance with generally accepted
accounting principles requires management to make estimates and assumptions that
affect the reported amounts and disclosures. Actual results could differ from
those estimates.

The following is a summary of significant accounting policies:

A. VALUATION OF INVESTMENTS -- Portfolio securities are valued by an outside
independent pricing service approved by the Trustees. The pricing service has
informed the Trust that in valuing the portfolio securities, it uses both a
computerized matrix of tax-exempt securities and evaluations by its staff, in
each case based on information concerning market transactions and quotations
from dealers which reflect the bid side of the market each day. The portfolio
securities are thus valued by reference to a combination of transactions and
quotations for the same or other securities believed to be comparable in
quality, coupon, maturity, type of issue, call provisions, trading
characteristics and other features deemed to be relevant. Short-term debt
securities having a maturity date of more than sixty days at time of purchase
are valued on a mark-to-market basis until sixty days prior to maturity and
thereafter at amortized cost based on their value on the 61st day. Short-term
debt securities having a maturity date of sixty days or less at the time of
purchase are valued at amortized cost.

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 Trust amortizes premiums and accretes discounts over the life of the
respective securities. Interest income is accrued daily.

C. FEDERAL INCOME TAX STATUS -- It is the Trust'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.

                                       13
<PAGE>   14

MORGAN STANLEY DEAN WITTER NEW YORK QUALITY MUNICIPAL SECURITIES

NOTES TO FINANCIAL STATEMENTS April 30, 2000 (unaudited) continued

D. DIVIDENDS AND DISTRIBUTIONS TO SHAREHOLDERS -- The Trust records dividends
and distributions to its shareholders on the ex-dividend date. The amount of
dividends and distributions from net investment income and net realized capital
gains are determined in accordance with federal income tax regulations which may
differ from generally accepted accounting principles. These "book/tax"
differences are either considered temporary or permanent in nature. To the
extent these differences are permanent in nature, such amounts are reclassified
within the capital accounts based on their federal tax-basis treatment;
temporary differences do not require reclassification. Dividends and
distributions which exceed net investment income and net realized capital gains
for financial reporting purposes but not for tax purposes are reported as
dividends in excess of net investment income or distributions in excess of net
realized capital gains. To the extent they exceed net investment income and net
realized capital gains for tax purposes, they are reported as distributions of
paid-in-capital.

2. INVESTMENT MANAGEMENT AGREEMENT

Pursuant to an Investment Management Agreement with Morgan Stanley Dean Witter
Advisors Inc. (the "Investment Manager"), the Trust pays the Investment Manager
a management fee, calculated weekly and payable monthly, by applying the annual
rate of 0.35% to the Trust's weekly net assets.

3. SECURITY TRANSACTIONS AND TRANSACTIONS WITH AFFILIATES

The cost of purchases and proceeds from sales of portfolio securities, excluding
short-term investments, for the six months ended April 30, 2000 aggregated
$4,023,790 and $2,897,462, respectively.

Morgan Stanley Dean Witter Trust FSB, an affiliate of the Investment Manager, is
the Trust's transfer agent. At April 30, 2000, the Trust had transfer agent fees
and expenses payable of approximately $4,600.

4. PREFERRED SHARES OF BENEFICIAL INTEREST

The Trust is authorized to issue up to 1,000,000 non-participating preferred
shares of beneficial interest having a par value of $.01 per share, in one or
more series, with rights as determined by the Trustees, without approval of the
common shareholders. The Trust has issued Series 1 and 2 Auction Rate Preferred
Shares ("Preferred Shares") which have a liquidation value of $50,000 per share
plus the

                                       14
<PAGE>   15

MORGAN STANLEY DEAN WITTER NEW YORK QUALITY MUNICIPAL SECURITIES

NOTES TO FINANCIAL STATEMENTS April 30, 2000 (unaudited) continued

redemption premium, if any, plus accumulated but unpaid dividends, whether or
not declared, thereon to the date of distribution. The Trust may redeem such
shares, in whole or in part, at the original purchase price of $50,000 per share
plus accumulated but unpaid dividends, whether or not declared, thereon to the
date of redemption.

Dividends, which are cumulative, are reset through auction procedures.

<TABLE>
<CAPTION>
                 AMOUNT IN             RESET         RANGE OF
SERIES  SHARES*  THOUSANDS*   RATE*     DATE     DIVIDEND RATES**
------  -------  ----------   -----   --------   ----------------
<S>     <C>      <C>          <C>     <C>        <C>
  1       260     $13,000     4.00%   05/01/00    2.79% - 5.75%
  2       220      11,000     4.67    05/04/00    2.00 - 5.30
</TABLE>

---------------------
 *  As of April 30, 2000.
** For the six months ended April 30, 2000.

Subsequent to April 30, 2000 and up through June 2, 2000, the Trust paid
dividends to Series 1 and 2 at rates ranging from 3.64% to 5.05%, in the
aggregate amount of $108,354.

The Trust is subject to certain restrictions relating to the preferred shares.
Failure to comply with these restrictions could preclude the Trust from
declaring any distributions to common shareholders or purchasing common shares
and/or could trigger the mandatory redemption of preferred shares at liquidation
value.

The preferred shares, which are entitled to one vote per share, generally vote
with the common shares but vote separately as a class to elect two Trustees and
on any matters affecting the rights of the preferred shares.

                                       15
<PAGE>   16

MORGAN STANLEY DEAN WITTER NEW YORK QUALITY MUNICIPAL SECURITIES

NOTES TO FINANCIAL STATEMENTS April 30, 2000 (unaudited) continued



5. COMMON SHARES OF BENEFICIAL INTEREST

Transactions in common shares of beneficial interest were as follows:

<TABLE>
<CAPTION>
                                                                                        CAPITAL
                                                                                        PAID IN
                                                                                       EXCESS OF
                                                               SHARES     PAR VALUE    PAR VALUE
                                                              ---------   ---------   -----------
<S>                                                           <C>         <C>         <C>
Balance, October 31, 1998...................................  5,081,813    $50,818    $72,160,377
Treasury shares purchased and retired (weighted average
 discount 6.27%)*...........................................    (93,300)      (933)    (1,189,141)
                                                              ---------    -------    -----------
Balance, October 31, 1999...................................  4,988,513     49,885     70,971,236
Treasury shares purchased and retired (weighted average
 discount 6.63%)*...........................................    (78,600)      (786)      (953,772)
                                                              ---------    -------    -----------
Balance, April 30, 2000.....................................  4,909,913    $49,099    $70,017,464
                                                              =========    =======    ===========
</TABLE>

---------------------
* The Trustees have voted to retire the shares purchased.

6. FEDERAL INCOME TAX STATUS

At October 31, 1999, the Trust had a net capital loss carryover of approximately
$2,343,000, which may be used to offset future capital gains to the extent
provided by regulations, which will be available through October 31 of the
following years:

<TABLE>
<CAPTION>
    AMOUNT IN THOUSANDS
---------------------------
 2002    2003   2004   2005
------   ----   ----   ----
<S>      <C>    <C>    <C>
$1,135   $854   $332   $22
======   ====   ====   ===
</TABLE>

7. DIVIDENDS TO COMMON SHAREHOLDERS

On March 28, 2000, the Trust declared the following dividends from net
investment income:

<TABLE>
<CAPTION>
 AMOUNT       RECORD        PAYABLE
PER SHARE      DATE          DATE
---------  ------------  -------------
<S>        <C>           <C>
 $0.065    May 5, 2000   May 19, 2000
 $0.065    June 9, 2000  June 23, 2000
</TABLE>

                                       16
<PAGE>   17

MORGAN STANLEY DEAN WITTER NEW YORK QUALITY MUNICIPAL SECURITIES

FINANCIAL HIGHLIGHTS

Selected ratios and per share data for a common share of beneficial interest
outstanding throughout each period:

<TABLE>
<CAPTION>
                                                             FOR THE SIX               FOR THE YEAR ENDED OCTOBER 31,*
                                                            MONTHS ENDED     ----------------------------------------------------
                                                           APRIL 30, 2000*     1999       1998       1997       1996       1995
---------------------------------------------------------------------------------------------------------------------------------
                                                             (unaudited)
<S>                                                        <C>               <C>        <C>        <C>        <C>        <C>
SELECTED PER SHARE DATA:
Net asset value, beginning of period.....................      $ 13.03       $ 14.73    $ 14.08    $ 13.07     $12.86     $10.90
                                                               -------       -------    -------    -------     ------     ------
Income (loss) from investment operations:
 Net investment income...................................         0.45          0.87       0.89       0.89       0.88       0.87
 Net realized and unrealized gain (loss).................         0.15         (1.69)      0.61       0.92       0.15       1.98
                                                               -------       -------    -------    -------     ------     ------
Total income (loss) from investment operations...........         0.60         (0.82)      1.50       1.81       1.03       2.85
                                                               -------       -------    -------    -------     ------     ------
Less dividends from:
 Net investment income...................................        (0.39)        (0.75)     (0.70)     (0.69)     (0.72)     (0.73)
 Common share equivalent of dividends paid to preferred
   shareholders..........................................        (0.09)        (0.15)     (0.16)     (0.16)     (0.16)     (0.16)
                                                               -------       -------    -------    -------     ------     ------
Total dividends..........................................        (0.48)        (0.90)     (0.86)     (0.85)     (0.88)     (0.89)
                                                               -------       -------    -------    -------     ------     ------
Anti-dilutive effect of acquiring treasury shares........         0.01          0.02       0.01       0.05       0.06         --
                                                               -------       -------    -------    -------     ------     ------
Net asset value, end of period...........................      $ 13.16       $ 13.03    $ 14.73    $ 14.08     $13.07     $12.86
                                                               =======       =======    =======    =======     ======     ======
Market value, end of period..............................      $12.188       $12.313    $14.063    $12.688     $11.25     $11.25
                                                               =======       =======    =======    =======     ======     ======

TOTAL RETURN+............................................         2.20%(1)    (7.39)%     16.92%     19.65%      6.52%     23.58%

RATIOS TO AVERAGE NET ASSETS OF COMMON SHAREHOLDERS:
Total expenses...........................................         0.91%(2)(3)   0.87%(3)   0.86%(3)   0.89%(3)   0.93%(3)   0.99%
Net investment income before preferred stock dividends...         6.84%(2)      6.13%      6.15%      6.64%      6.74%      7.31%
Preferred stock dividends................................         1.38%(2)      1.06%      1.13%      1.16%      1.22%      1.37%
Net investment income available to common shareholders...         5.46%(2)      5.07%      5.02%      5.48%      5.52%      5.94%

SUPPLEMENTAL DATA:
Net assets, end of period, in thousands..................      $88,628       $89,004    $98,862    $96,111    $93,050    $94,591
Asset coverage on preferred shares at end of period......          369%          371%       412%       400%       389%       394%
Portfolio turnover rate..................................            3%           13%        14%        --          5%         1%
</TABLE>

---------------------
 *  The per share amounts were computed using an average number of shares
    outstanding during the period.
 +  Total return is based upon the current market value on the last day of each
    period reported. Dividends and distributions are assumed to be reinvested at
    the prices obtained under the Trust's dividend reinvestment plan. Total
    return does not reflect brokerage commissions.
(1) Not annualized.
(2) Annualized.
(3) Does not reflect the effect of expense offset of 0.01%.


                       SEE NOTES TO FINANCIAL STATEMENTS

                                       17
<PAGE>   18

MORGAN STANLEY DEAN WITTER NEW YORK QUALITY MUNICIPAL SECURITIES

REVISED INVESTMENT POLICY (unaudited)

On January 26, 2000, the Trustees of Morgan Stanley Dean Witter New York Quality
Municipal Securities (the "Trust") approved an investment policy whereby the
Trust would be permitted to invest up to 10% of its assets in inverse floating
rate municipal obligations. The inverse floating rate municipal obligations in
which the Trust will invest are typically created through a division of a fixed
rate municipal obligation into two separate instruments, a short-term obligation
and a long-term obligation. The interest rate on the short-term obligation is
set at periodic auctions. The interest rate on the long-term obligation is the
rate the issuer would have paid on the fixed income obligation: (i) plus the
difference between such fixed rate and the rate on the short-term obligation, if
the short-term rate is lower than the fixed rate; or (ii) minus such difference
if the interest rate on the short-term obligation is higher than the fixed rate.
The interest rates on these obligations generally move in the reverse direction
of market interest rates. If market interest rates fall, the interest rate on
the obligation will increase and if market interest rates increase, the interest
rate on the obligation will fall. Inverse floating rate municipal obligations
offer the potential for higher income than is available from fixed rate
obligations of comparable maturity and credit rating. They also carry greater
risks. In particular, the prices of inverse floating rate municipal obligations
are more volatile, i.e., they increase and decrease in response to changes in
interest rates to a greater extent than comparable fixed rate obligations.

                                       18
<PAGE>   19

                      (This Page Intentionally Left Blank)
<PAGE>   20

TRUSTEES
----------------------------------
Michael Bozic
Charles A. Fiumefreddo
Edwin J. Garn
Wayne E. Hedien
Dr. Manuel H. Johnson
Michael E. Nugent
Philip J. Purcell
John L. Schroeder

OFFICERS
----------------------------------
Charles A. Fiumefreddo
Chairman and Chief Executive Officer

Mitchell M. Merin
President

Barry Fink
Vice President, Secretary and General Counsel

James F. Willison
Vice President

Thomas F. Caloia
Treasurer

TRANSFER AGENT
----------------------------------
Morgan Stanley Dean Witter Trust FSB
Harborside Financial Center -- Plaza Two
Jersey City, New Jersey 07311

INDEPENDENT ACCOUNTANTS
----------------------------------
PricewaterhouseCoopers LLP
1177 Avenue of the Americas
New York, New York 10036

INVESTMENT MANAGER
----------------------------------
Morgan Stanley Dean Witter Advisors Inc.
Two World Trade Center
New York, New York 10048

The financial statements included herein have been taken from the records of the
Fund without examination by the independent accountants and accordingly they
do not express an opinion thereon.

MORGAN STANLEY
DEAN WITTER
NEW YORK QUALITY MUNICIPAL SECURITIES

Semiannual Report
April 30, 2000



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