<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
MSDW CALIFORNIA QUALITY MUNICIPAL SECURITIES
</LEGEND>
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-2000
<PERIOD-END> APR-30-2000
<INVESTMENTS-AT-COST> 199,457,307
<INVESTMENTS-AT-VALUE> 192,014,283
<RECEIVABLES> 3,465,039
<ASSETS-OTHER> 72,997
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 195,552,319
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> (219,272)
<TOTAL-LIABILITIES> (219,272)
<SENIOR-EQUITY> 55,000,000
<PAID-IN-CAPITAL-COMMON> 154,202,522
<SHARES-COMMON-STOCK> 10,726,213
<SHARES-COMMON-PRIOR> 10,973,913
<ACCUMULATED-NII-CURRENT> 955,332
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (7,381,783)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (7,443,024)
<NET-ASSETS> 195,333,047
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 5,469,421
<OTHER-INCOME> 0
<EXPENSES-NET> (552,552)
<NET-INVESTMENT-INCOME> 4,916,869
<REALIZED-GAINS-CURRENT> (63,864)
<APPREC-INCREASE-CURRENT> 2,234,337
<NET-CHANGE-FROM-OPS> 7,087,342
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (5,262,388)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 0
<NUMBER-OF-SHARES-REDEEMED> (247,700)
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> (1,128,125)
<ACCUMULATED-NII-PRIOR> 1,300,851
<ACCUMULATED-GAINS-PRIOR> (7,317,919)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> (342,183)
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> (558,218)
<AVERAGE-NET-ASSETS> 140,532,895
<PER-SHARE-NAV-BEGIN> 12.89
<PER-SHARE-NII> 0.45
<PER-SHARE-GAIN-APPREC> 0.20
<PER-SHARE-DIVIDEND> (0.46)
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 13.08
<EXPENSE-RATIO> 0.79
</TABLE>
