BLACKROCK INVESTMENT QUALITY MUNICIPAL TRUST INC
N-30D, 2000-06-30
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--------------------------------------------------------------------------------
             THE BLACKROCK INVESTMENT QUALITY MUNICIPAL TRUST INC.
                       SEMI-ANNUAL REPORT TO SHAREHOLDERS
                          REPORT OF INVESTMENT ADVISOR
--------------------------------------------------------------------------------
                                                                    May 31, 2000
Dear Shareholder:

     The  Federal  Reserve  continued  to  aggressively tighten in an attempt to
achieve  its  objective  of  a soft-landing for the explosive U.S. economy. As a
result,  the  Federal  Reserve  tightened  short-term  rates by 0.75% during the
period  and  raised  rates by another 0.50% at the May FOMC meeting to 6.50%. In
the   first  four  months  of  the  new  millennium  we  have  been  witness  to
unprecedented  volatility  in  both  the  Treasury  yield  curve  and the spread
sectors.  The  Treasury  curve inverted sharply as expectations of continued Fed
tightening  in  the  wake of an insatiable U.S. economy, while anticipation of a
significant  buyback  at  the  long  end  of  the maturity spectrum led to lower
yields  on  long  Treasuries.  The  yield curve inversion along with the premium
placed   on   the   dwindling   outstanding   Treasuries   caused   a   dramatic
underperformance  of  spread sectors relative to the performance of the Treasury
sectors, especially in the 10- to 30-year part of the curve.

     At  this  juncture, the general implication for spread product is negative,
but  the  potential  for  spread widening is more limited. Most of the negatives
for  high  quality  spread  product  in  terms  of relative supply differentials
between  Treasuries  and non-Treasuries as well as equity market volatility have
been  priced  into  the  market.  Given current market conditions, we maintain a
significant  overweight  in  high  quality  spread product. Treasuries are fully
valued  even  considering  the  strong technicals in the market. While near-term
volatility  is  virtually  guaranteed by an active Federal Reserve, a successful
soft  landing  of  the  economy  would  ultimately  result  in  a healthier U.S.
economy.

     This  report contains a summary of market conditions during the semi-annual
period  and  a review of portfolio strategy by your Trust's managers in addition
to  the  Trust's  unaudited  financial  statements  and  a  detailed list of the
portfolio's  holdings.  Continued  thanks  for  your confidence in BlackRock. We
appreciate  the opportunity to help you achieve your long-term investment goals.



Sincerely,

/s/ Laurence D. Fink               /s/ Ralph L. Schlosstein
--------------------               ------------------------
Laurence D. Fink                   Ralph L. Schlosstein
Chairman                           President


                                       1
<PAGE>

                                                                   May 31, 2000
Dear Shareholder:

     We  are  pleased  to  present  the  unaudited  semi-annual  report  for The
BlackRock  Investment  Quality  Municipal  Trust  Inc. (the "Trust") for the six
months  ended  April  30, 2000. We would like to take this opportunity to review
the  Trust's  stock  price  and  net  asset  value  (NAV) performance, summarize
developments   in   the  fixed  income  markets  and  discuss  recent  portfolio
management activity.

     The  Trust  is  a  diversified, actively managed closed-end bond fund whose
shares  are  traded  on  the New York Stock Exchange under the symbol "BKN". The
Trust's  investment  objective  is to provide high current income that is exempt
from  regular  Federal  income  tax consistent with the preservation of capital.
The  Trust  seeks  to  achieve  this  objective by investing in investment grade
(rated  "AAA"  to  "BBB"  by  a  major  rating  agency or of equivalent quality)
tax-exempt  general  obligation  and  revenue  bonds  issued by city, county and
state municipalities throughout the United States.

     The  table  below summarizes the changes in the Trust's stock price and NAV
over the past six months:

                         -------------------------------------------------------
                          4/30/00    10/31/99     CHANGE      HIGH       LOW
--------------------------------------------------------------------------------
 STOCK PRICE             $12.50      $13.125     (4.76%)     $13.25    $11.5625
--------------------------------------------------------------------------------
 NET ASSET VALUE (NAV)   $13.74      $13.95      (1.51%)     $14.12    $13.55
--------------------------------------------------------------------------------

THE FIXED INCOME MARKETS

     The  dynamic  expansion  of the U.S. economy continues undaunted by Federal
Reserve  Chairman Greenspan's attempt to brake the economy, short of stalling it
into  a  recession.  The  labor markets remain tight, growth remains strong with
5%+  annualized  growth  rates  and inflation pressures continue to be offset by
increased  productivity.  However,  the  Fed remains cautious, in their February
minutes  it was noted that: "Other members acknowledged that the Committee might
need  to move more aggressively at a later meeting should imbalances continue to
build  and  inflation  expectations  clearly  begin  to pick up." At the Federal
Reserve  meeting  in  November,  February  and March the Fed raised the discount
rate  by 0.25% at each meeting and a 0.50% increase was made in May to bring the
current discount rate to 6.50%.

     The  Treasury  Yield curve experienced a complex set of dynamics, which has
inverted  the  curve  and  may  continue to invert the curve for the foreseeable
future.  The  yields  on the short-end of the curve increased sharply during the
period  in response to three Federal Reserves increases to the discount rate and
perceived  future Fed actions in the coming months. The long-end of the curve is
reacting  to  the  "official"  announcement  that the Treasury will buy back $30
billion  of Treasuries with maturities ranging 10 to 30 years. With a decreasing
supply  of  available Treasuries, a balanced budget, and an unchanged demand for
longer  maturity  Treasuries,  we  would  anticipate this condition to continue.
This  condition  is  further  augmented  by  Treasury  auction activity, as they
reduce  the  available  bonds  on the long end of the curve they continue to add
supply  in  the  1-10  year range through periodic auctions. For the semi-annual
period,  the  yield  of the 10-year Treasury security rose from 6.02% on October
31, 1999 to 6.22% on April 30, 2000.

     Municipal  bonds  outperformed  the taxable domestic bond market during the
past  six  months,  returning  2.63% (as measured by the LEHMAN MUNICIPAL INDEX)
versus  the LEHMAN AGGREGATE INDEX'S 1.42% on a pre-tax basis. Overall, the tone
in  the  market  during  the  period  was  extremely  positive  as the result of
continued   strong  demand  from  individual/retail  investors  coupled  with  a
slowdown  in  new  issuance. During 1999, households increased their holdings of
individual  municipal  bonds  by  over  $40  billion  while mutual funds saw net
outflows.  Offsetting  the large amount of mutual fund outflows during the first
quarter  of 2000 was a 43% decline in overall new municipal bond issuance led by
a  90% drop in refunding volume. Refunding volume was down due to the relatively
higher  interest  rates  experienced during the first quarter 2000 when compared
to  the  first  quarter  1999, while new money issuance has declined because the
strong  economy  has  led  to  full  coffers  at most municipalities. Currently,
municipal   bonds  across  the  entire  maturity  spectrum  are  at  their  most
attractive relationships to their Treasury market counterparts.

                                       2
<PAGE>


THE TRUST'S PORTFOLIO AND INVESTMENT STRATEGY

     The  Trust's portfolio is actively managed to diversify exposure to various
sectors,  issuers,  revenue  sources  and security types. BlackRock's investment
strategy  emphasizes  a  relative  value  approach,  which  allows  the Trust to
capitalize  upon  changing  market  conditions  by  rotating  municipal sectors,
credits and coupons.

     Additionally,   the  Trust  employs  leverage  to  enhance  its  income  by
borrowing  at  short-term  municipal  rates and investing the proceeds in longer
maturity  issues  that  have  higher  yields.  The degree to which the Trust can
benefit  from  its  use  of  leverage may affect its ability to pay high monthly
income.  During the period, the Trust issued $16,550,000 in additional preferred
shares.  At  the  end of the semi-annual period, the Trust's leverage amount was
39% of total assets.

     As  municipal credit spreads remained tight during the reporting period, we
continued  to  emphasize higher rated securities over the lower rated investment
grade  sector.  We  believe  that  credit spreads will return to more historical
levels  in  the  near  future  and  as such the Trust should be rewarded for its
higher  credit  quality  bias.  The Trust has continued its bias towards premium
coupon  securities  over  discount  priced  securities, as premium coupons offer
better  price  performance  during  periods of rising interest rates and similar
performance to discounts when interest rates fall.

     The  following  charts  compare  the  Trust's  current and October 31, 1999
asset composition and credit quality allocations:

--------------------------------------------------------------------------------
                                SECTOR BREAKDOWN
--------------------------------------------------------------------------------
  SECTOR                            APRIL 30, 2000   OCTOBER 31, 1999
--------------------------------------------------------------------------------
  Transportation                          25%               23%
--------------------------------------------------------------------------------
  City, County & State                    14%               15%
--------------------------------------------------------------------------------
  Hospital                                14%               13%
--------------------------------------------------------------------------------
  Industrial & Pollution Control          10%               10%
--------------------------------------------------------------------------------
  Housing                                  7%                5%
--------------------------------------------------------------------------------
  Power                                    7%                8%
--------------------------------------------------------------------------------
  University/School                        7%                7%
--------------------------------------------------------------------------------
  Lease Revenue                            6%                6%
--------------------------------------------------------------------------------
  Water & Sewer                            5%                5%
--------------------------------------------------------------------------------
  Resource Recovery                        2%                2%
--------------------------------------------------------------------------------
  Special District                         2%                2%
--------------------------------------------------------------------------------
  Tax Revenue                              1%                4%
--------------------------------------------------------------------------------

--------------------------------------------------------------------------------
  CREDIT RATING*                      APRIL 30, 2000     OCTOBER 31, 1999
--------------------------------------------------------------------------------
            AAA/Aaa                        61%                 63%
--------------------------------------------------------------------------------
             AA/Aa                         14%                 10%
--------------------------------------------------------------------------------
              A/A                          14%                 13%
--------------------------------------------------------------------------------
           BBB/Baa/NR                      11%                 14%
--------------------------------------------------------------------------------

----------
* Using the higher of Standard & Poor's, Moody's or Fitch's rating.

                                       3
<PAGE>

     We  look  forward  to  continuing  to  manage the Trust to benefit from the
opportunities  available  to investors in the investment grade municipal market.
We  thank  you  for  your  investment  and  continued  interest in The BlackRock
Investment  Quality  Municipal Trust Inc. Please feel free to call our marketing
center  at  (800)  227-7BFM (7236) if you have any specific questions which were
not addressed in this report.


Sincerely yours,

/s/ Robert S. Kapito                    /s/ Kevin M. Klingert
--------------------                    ---------------------
Robert S. Kapito                        Kevin M. Klingert
Vice Chairman and Portfolio Manager     Managing Director and Portfolio Manager
BlackRock Advisors, Inc.                BlackRock Advisors, Inc.


--------------------------------------------------------------------------------
            THE BLACKROCK INVESTMENT QUALITY MUNICIPAL TRUST INC.
--------------------------------------------------------------------------------
  Symbol on New York Stock Exchange:                               BKN
--------------------------------------------------------------------------------
  Initial Offering Date:                                    February 19, 1993
--------------------------------------------------------------------------------
  Closing Stock Price as of 4/30/00:                             $12.50
--------------------------------------------------------------------------------
  Net Asset Value as of 4/30/00:                                 $13.74
--------------------------------------------------------------------------------
  Yield on Closing Stock Price as of 4/30/00 ($12.50)(1):          6.90%
--------------------------------------------------------------------------------
  Current Monthly Distribution per Share(2):                     $ 0.0719
--------------------------------------------------------------------------------
  Current Annualized Distribution per Share(2):                  $ 0.8628
--------------------------------------------------------------------------------

(1)  Yield on  Closing  Stock  Price  is  calculated  by  dividing  the  current
     annualized distribution per share by the closing stock price per share.

(2)  Distribution is not constant and is subject to change.

                                       4
<PAGE>


--------------------------------------------------------------------------------
THE BLACKROCK INVESTMENT QUALITY MUNICIPAL TRUST INC.
PORTFOLIO OF INVESTMENTS APRIL 30, 2000 (UNAUDITED)
--------------------------------------------------------------------------------
<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
        PRINCIPAL
          AMOUNT                                                                                       OPTION CALL        VALUE
 RATING*   (000)                               DESCRIPTION                                             PROVISIONS+       (NOTE 1)
------------------------------------------------------------------------------------------------------------------------------------
<S>       <C>       <C>                                                                               <C>             <C>
AAA                 LONG-TERM INVESTMENTS-160.8%
                    ALASKA-5.1%
Aa2       $12,000   Alaska St. Hsg. Fin. Corp. Rev., Ser. A, 5.875%, 12/01/24, MBIA ....................  12/05 @ 102   $11,642,640
AA                                                                                                                      -----------
AAA                 CALIFORNIA-14.7%
AAA         1,220   California Hsg. Fin. Agcy. Rev., Home Mtg., Ser. C, 5.65%, 8/01/14 .................   2/04 @ 102     1,222,769
AAA         5,770   California St. G.O., 5.00%, 10/01/14 ...............................................  10/07 @ 101     5,539,027
AAA         3,000   Foothill Eastern Corridor Agcy. Toll Road Rev., 5.00%, 1/15/16, MBIA ...............   1/10 @ 101     2,815,590
AAA        15,460   Los Angeles Cnty. Asset Leasing Corp. Rev., 5.95%, 12/01/07, AMBAC ................. No Opt. Call    16,497,521
                    University of California Rev., Research Fac., Ser. B,
AAA         2,000++   6.10%, 9/01/03 ...................................................................      N/A         2,118,800
AAA         3,305++   6.20%, 9/01/03 ...................................................................      N/A         3,511,397
AAA         2,000++   6.25%, 9/01/03 ...................................................................      N/A         2,127,940
                                                                                                                        -----------
                                                                                                                         33,833,044
                                                                                                                        -----------
                    COLORADO-14.4%
AAA         3,100   Arapahoe Cnty. Cap. Impvt. Hwy. Rev., Trust Fund, Ser. E, Zero Coupon, 8/31/04 .....     ETM          2,473,025
                    Denver City & Cnty. Arpt. Rev.,
AAA         1,000     Ser. A, 5.60%, 11/15/20, MBIA ....................................................  11/05 @ 102       960,980
A+          3,000     Ser. C, 6.50%, 11/15/06 ..........................................................  11/02 @ 102     3,094,500
A+          1,120     Ser. C, 6.65%, 11/15/05 ..........................................................  11/02 @ 102     1,162,818
AAA         3,705++   Ser. D, 7.00%, 11/15/01 ..........................................................      N/A         3,822,374
BBB+       14,085     Ser. D, 7.00%, 11/15/25 ..........................................................  11/01 @ 100    14,167,397
                    E-470 Pub. Hwy. Auth. Rev., Ser. B,
AAA         3,000     Zero Coupon, 9/01/11, MBIA ....................................................... No Opt. Call     1,599,240
AAA        10,000     Zero Coupon, 9/01/18, MBIA ....................................................... No Opt. Call     3,329,700
AAA         2,250++   6.90%, 8/31/05 ...................................................................       N/A        2,494,980
                                                                                                                        -----------
                                                                                                                         33,105,014
                                                                                                                        -----------
                    CONNECTICUT-1.1%
Baa3        3,000   Mashantucket Western Pequot Tribe, Spl. Rev., 5.50%, 9/01/28 .......................     9/09 101     2,536,650
                                                                                                                        -----------
                    DISTRICT OF COLUMBIA-2.1%
                    District of Columbia G.O., Ser. E, CAPMAC,
AAA            70++   6.00%, 6/01/03 ...................................................................       N/A           73,215
AAA         1,830     6.00%, 6/01/09 ...................................................................   6/03 @ 102     1,882,356
AAA         3,000     Washington D.C. Convention Ctr. Auth., Ded. Tax Rev., 5.25%, 10/01/17, AMBAC .....  10/08 @ 101     2,778,750
                                                                                                                        -----------
                                                                                                                          4,734,321
                                                                                                                        -----------
                    FLORIDA-2.4%
AAA         1,705   Florida Hsg. Fin. Agcy. Rev., Sngl. Fam. Mtg., Ser. 1994-A, 6.55%, 7/01/14, GNMA ...   1/05 @ 102     1,755,195
Baa3        4,000   Santa Rosa Bay Bridge Auth. Rev., 6.25%, 7/01/28 ...................................   7/06 @ 102     3,696,440
                                                                                                                        -----------
                                                                                                                          5,451,635
                                                                                                                        -----------
                    GEORGIA-1.1%
A           3,000   Burke Cnty. Dev. Auth. P.C.R., Pwr. Co., Plant Vogtle, 3rd Ser., 5.45%, 5/01/34 ....   5/04 @ 102     2,580,930
                                                                                                                        -----------
                    ILLINOIS-6.9%
AAA         2,500   Chicago Waste Wtr. Transmission Rev., 5.125%, 1/01/25, FGIC ........................   1/06 @ 102     2,168,950
AAA         5,050   Chicago Wtr. Rev., 5.25%, 11/01/23, FGIC ...........................................  11/07 @ 102     4,489,096
                    Illinois Edl. Fac. Auth. Rev., Loyola Univ., FGIC,
AAA         4,000++   5.45%, 7/01/05 ...................................................................        N/A       4,026,840
AAA         5,000++   5.70%, 7/01/05 ...................................................................        N/A       5,084,900
                                                                                                                        -----------
                                                                                                                         15,769,786
                                                                                                                        -----------
                    INDIANA-3.4%
BBB         7,595   Indianapolis Arpt. Auth. Rev., Spl. Fac., Fed. Express Corp. Proj., 7.10%, 1/15/17 .   7/04 @ 102     7,794,521
                                                                                                                        -----------
                    KENTUCKY-7.8%
AAA         2,850   Boone Cnty. P.C.R., 5.50%, 1/01/24, MBIA ...........................................   1/04 @ 102     2,687,920
AAA        15,000   Kentucky St. Tpke. Auth., Econ. Dev. Road Rev., 5.75%, 7/01/13, AMBAC ..............   7/03 @ 102    15,200,250
                                                                                                                        -----------
                                                                                                                         17,888,170
                                                                                                                        -----------
                    LOUISIANA-6.6%
AAA        14,400++ Louisiana Pub. Fac. Auth. Hosp. Rev., Our Lady of the Lake Regl. Med. Ctr.,
                      5.90%, 12/01/03, FSA .............................................................        N/A      15,070,176
                                                                                                                        -----------
</TABLE>
                       See Notes to Financial Statements.

                                       5
<PAGE>


<TABLE>
<CAPTION>
-----------------------------------------------------------------------------------------------------------------------------------
        PRINCIPAL
          AMOUNT                                                                                            OPTION CALL     VALUE
 RATING*  (000)                                  DESCRIPTION                                                PROVISIONS+   (NOTE 1)
-----------------------------------------------------------------------------------------------------------------------------------
<S>     <C>       <C>                                                                                    <C>           <C>
                  MARYLAND-5.7%
 Aa2    $ 9,595   Maryland St. Dept. Hsg. & Comn. Dev. Admin., Sngl. Fam. Prog.,
                    Ser. 2, 6.55%, 4/01/26 ............................................................    4/05 @ 102  $ 9,756,772
 AAA      3,175   Northeast Waste Disp. Auth. Rev., Sld. Wst., Montgomery Cnty.
                    Res. Rec. Proj., Ser. A, 6.30%, 7/01/16, MBIA .....................................    7/03 @ 102    3,249,168
                                                                                                                       -----------
                                                                                                                        13,005,940
                                                                                                                       -----------
                  MASSACHUSETTS-2.3%
 AAA      6,000     Massachusetts St. Hlth. & Edl. Fac. Auth. Rev., Hallmark Hlth.
                    Sys., Ser. A, 5.00%, 7/01/21, FSA .................................................    7/08 @ 101    5,186,880
                                                                                                                       -----------
                  MICHIGAN-3.9%
 AAA      4,000   Greater Detroit Res. Rec. Auth. Rev., Ser. A, 6.25%, 12/13/08, AMBAC ...............   No Opt. Call    4,240,520
 AAA      5,000   River Rouge Sch. Dist., 5.625%, 5/01/22, FSA .......................................   5/03 @ 101.5    4,813,650
                                                                                                                       -----------
                                                                                                                         9,054,170
                                                                                                                       -----------
                  MISSOURI-1.6%
                  Lake of the Ozarks Cmnty. Brdg. Corp., Brdg. Sys. Rev.,
 BBB-     2,000     5.25%, 12/01/14 ..................................................................    12/08 @ 102    1,754,780
 BBB-     2,500     5.25%, 12/01/26 ..................................................................    12/08 @ 102    2,049,100
                                                                                                                       -----------
                                                                                                                         3,803,880
                                                                                                                       -----------
                  NEVADA-1.7%
 AAA      3,750   Washoe Cnty. Arpt. Auth., Arpt. Sys. Impvt. Rev., Ser. B, 5.80%, 7/01/09, MBIA .....     7/03 @ 102    3,832,088
                                                                                                                       -----------
                  NEW JERSEY-5.7%
 AAA      2,000   Delaware River Port Auth. PA & NJ Port Dist. Proj., Ser. B, 5.70%, 1/01/22, FSA ....     1/10 @ 100    1,965,560
 AAA      4,000   New Jersey St. Tpk. Auth., Tpk. Rev., Ser. A, 5.75%, 1/01/16, MBIA .................     1/10 @ 100    4,036,000
 AA       7,000   New Jersey St. Transp. Trust Fund Auth. Rev., Ser. A, Transp. Sys., 6.00%, 6/15/19 .     6/10 @ 100    7,128,940
                                                                                                                       -----------
                                                                                                                        13,130,500
                                                                                                                       -----------
                  NEW MEXICO-0.8%
 AAA      1,945   Farmington P.C.R., So. CA. Edison Co. Ser. A, 5.875%, 6/01/23, MBIA ................     6/03 @ 102    1,917,070
                                                                                                                       -----------
                  NEW YORK-30.4%
 AAA      5,400   Metropolitan Trans. Auth. Commuter Fac. Rev., Ser. A, 5.75%, 7/01/21, MBIA .........   7/07 @ 101.5    5,308,416
                  New York City G.O.,
 A        4,140     Ser. A, 6.00%, 8/01/05 ...........................................................   No Opt. Call    4,279,021
 AAA      3,000     Ser. D, 5.60%, 11/01/05, AMBAC ...................................................   No Opt. Call    3,065,880
 A        7,000     Ser. E, 6.50%, 2/15/06 ...........................................................   No Opt. Call    7,400,680
 A-       6,440++   Ser. H, 7.20%, 2/01/02 ...........................................................        N/A        6,785,055
 A          560     Ser. H, 7.20%, 2/01/13 ...........................................................   2/02 @ 101.5      587,793
                  New York City Ind. Dev. Agcy. Spec. Fac. Rev., Term. One Group Assoc. Proj.,
 A        4,000       6.00%, 1/01/08 .................................................................     1/04 @ 102    4,063,600
 A        1,000       6.00%, 1/01/15 .................................................................     1/04 @ 102      999,130
 AAA      9,375   New York City Mun. Wtr. Fin. Auth., Wtr. & Swr. Rev., Ser. A,
                     5.125%, 6/15/22, AMBAC...     6/07 @ 101    8,343,562
 AA+     10,000   New York City Transitional Fin. Auth. Rev., Ser. B, 6.00%, 11/15/21 ................     5/10 @ 101   10,132,800
 AAA      3,000++ New York St. Dorm. Auth. Rev., St. Univ. Edl. Fac., Ser. B, 6.10%, 5/15/04 .........        N/A        3,175,080
 A-       1,955   New York St. Hsg. Fin. Agcy., Hlth. Fac. of New York City,
                     Ser. A, 6.375%, 11/01/04 ...   No Opt. Call    2,048,351
 AAA      5,000++ New York St. Med. Care Fac. Rev., NY Hosp., Ser. A, 6.60%, 2/15/05, AMBAC ..........        N/A        5,417,300
 AAA      5,550   New York St. Twy. Auth., Svc. Contract Rev., Ser. B, 5.375%, 4/01/14, MBIA .........     4/08 @ 101    5,460,035
 AAA      2,620   New York St. Urban Dev. Corp. Rev., Correctional Fac., 5.625%, 1/01/07, AMBAC ......     1/03 @ 102    2,670,776
                                                                                                                       -----------
                                                                                                                        69,737,479
                                                                                                                       -----------
                  NORTH CAROLINA-2.4%
 AAA      5,000   North Carolina Eastn. Mun. Pwr. Agcy. Rev., Ser. B, 7.00%, 1/01/08, CAPMAC .........   No Opt. Call    5,506,600
                                                                                                                       -----------
                  OHIO-0.7%
 NR         485   Cleveland Cuyahoga Cnty. Port Auth. Rev., Port Dev. Proj., 6.00%, 3/01/07 ..........   No Opt. Call      473,923
 AAA      1,220   Ohio St. Higher Edl. Fac. Com., Univ. Dayton Proj., 5.35%, 12/01/17, AMBAC .........    12/07 @ 101    1,179,288
                                                                                                                       -----------
                                                                                                                         1,653,211
                                                                                                                       -----------
                  OREGON-2.3%
 BBB-     5,600   Klamath Falls Oregon Elec. Rev., Sr. Lien-Klamath Cogen, 5.50%, 1/01/07 ............   No Opt. Call    5,327,224
                                                                                                                       -----------
                  PENNSYLVANIA-11.7%
 AAA     10,100   Lehigh Cnty. Gen. Purpose Auth. Rev., St. Lukes Hosp. Bethlehem Proj.,
                    5.50%, 11/15/13, AMBAC ...........................................................    11/03 @ 102    9,973,346
 AAA      7,000   Montgomery Cnty. Ed. & Hlth. Care Auth., Holy Redeemer, 5.25%, 10/01/23, AMBAC .....    10/07 @ 101    6,242,530
 AAA      4,000   Pennsylvania Intergovernmental Coop. Auth. Spl. Tax Rev., Philadelphia Fdg. Prog.,
                    5.50%, 6/15/20, FGIC .............................................................     6/06 @ 100    3,812,240
 AAA      1,500   Pennsylvania St. G.O., First Ser., 5.375%, 5/15/09, FGIC ...........................   5/06 @ 101.5    1,519,080
</TABLE>
                       See Notes to Financial Statements.

                                       6
<PAGE>

<TABLE>
<CAPTION>
-----------------------------------------------------------------------------------------------------------------------------------
         PRINCIPAL
          AMOUNT                                                                                         OPTION CALL      VALUE
 RATING*   (000)                                 DESCRIPTION                                             PROVISIONS+     (NOTE 1)
-----------------------------------------------------------------------------------------------------------------------------------
<S>       <C>     <C>                                                                                    <C>          <C>
                  Pennsylvania St. Higher Edl. Fac. Auth., Hlth. Svcs. Rev., Ser. A,
 A        $ 3,300   5.75%, 1/01/17 ...................................................................    1/06 @ 101  $  2,824,437
 A          2,750   5.875%, 1/01/15 ..................................................................    1/06 @ 101     2,429,350
                                                                                                                      ------------
                                                                                                                        26,800,983
                                                                                                                      ------------
                  RHODE ISLAND-2.3%
 AA+        3,270 Rhode Island Hsg. & Mtg. Fin., Homeownership Oppty.,
                    Ser. 15-B, 6.75%, 10/01/17 .......................................................    4/04 @ 102     3,383,796
 AAA        2,000 Rhode Island St. Hlth. & Edl. Bldg. Corp. Rev., Hosp. Fin.,
                    5.50%, 5/15/16, MBIA ..... .......................................................    5/07 @ 102     1,929,300
                                                                                                                      ------------
                                                                                                                         5,313,096
                                                                                                                      ------------
                  TENNESSEE-3.5%
 A          7,800 Maury Cnty. Ind. Dev. Brd., P.C.R., Saturn Corp. Proj., 6.50%, 9/01/24 .............    9/04 @ 102     7,938,918
                                                                                                                      ------------
                  TEXAS-4.7%
                  Dallas Cnty. Util., Ser. A, AMBAC,
 AAA        6,085   Zero Coupon, 2/15/19 ............................................................. 2/05 @ 44.538     1,862,801
 AAA        3,800   Zero Coupon, 2/15/20 ............................................................. 2/05 @ 41.799     1,073,462
 Baa1       5,500 Dallas Ft. Worth Intl. Arpt. Fac. Impt. Rev., Amer. Airlines Inc.,
                    6.375%, 5/01/35 ..................................................................   11/09 @ 101     5,161,640
 A3         2,640 Sabine River Auth., P.C.R., Coll-Texas Utilities Elec. Proj.,
                    Ser. B, 8.25%, 10/01/20 ..........................................................   10/00 @ 102     2,720,494
                                                                                                                      ------------
                                                                                                                        10,818,397
                                                                                                                      ------------
                  UTAH-2.5%
                  Intermountain Pwr. Agcy., Pwr. Supply Rev.,
 A+         1,800   Ser. 86-B, 5.00%, 7/01/16 ........................................................    6/00 @ 100     1,614,726
 AAA        4,450   Ser. F, 5.00%, 7/01/13, AMBAC ....................................................    6/00 @ 100     4,197,818
                                                                                                                      ------------
                                                                                                                         5,812,544
                                                                                                                      ------------
                  WASHINGTON-13.0%
 AA         6,900 Seattle G.O., 5.40%, 1/01/08 .......................................................    1/03 @ 102     6,941,676
 AA         2,650 Seattle Wtr. Sys. Rev., 5.50%, 6/01/18 .............................................    6/03 @ 102     2,578,477
                  Washington St. G.O.,
 AA+        4,000   Ser. A, 5.375%, 7/01/21 ..........................................................    7/06 @ 100     3,724,440
 AA+        1,000   Ser. B, 6.00%, 1/01/25 ...........................................................    1/10 @ 100       999,380
                  Washington St. Pub. Pwr. Supply Sys. Rev.,
 AAA       13,395   Nuclear Proj. No. 1, 5.75%, 7/01/11, MBIA ........................................    7/06 @ 102    13,568,599
 AAA        2,000   Nuclear Proj. No. 2, 5.55%, 7/01/10, FGIC ........................................    7/03 @ 102     1,992,340
                                                                                                                      ------------
                                                                                                                        29,804,912
                                                                                                                      ------------
                  TOTAL LONG-TERM INVESTMENTS (COST $369,811,210).....................................                 369,050,779
                                                                                                                      ------------
                  SHORT-TERM INVESTMENTS**-0.8%
              800 NEW YORK-0.3%
 A-1+             New York City Mun. Wtr. Fin. Auth. Rev., Ser. G, 5.90%, 5/01/00, FRDD ..............                     800,000

                  TEXAS-0.5%
 A-1+       1,075 Harris Cnty. Hlth. Fac. Dev. Corp. Rev., St. Lukes Episcopal Hosp.,
                    6.00%, 5/01/00, FRDD .............................................................                   1,075,000
                                                                                                                      ------------
                  TOTAL SHORT-TERM INVESTMENTS (COST $1,875,000)......................................                   1,875,000
                                                                                                                      ------------
                  TOTAL INVESTMENTS-161.6% (COST $371,686,210)........................................                 370,925,779
                  Other assets in excess of liabilities-2.2% .........................................                   5,116,229
                  Liquidation value of preferred stock-(63.8)% .......................................                (146,550,000)
                                                                                                                      ------------
                  NET ASSETS APPLICABLE TO COMMON SHAREHOLDERS-100% ..................................                $229,492,008
                                                                                                                      ============
</TABLE>

----------
 * Using the higher of Standard & Poor's, Moody's or Fitch's rating.
** For  purposes  of  amortized  cost  valuation,  the  maturity  date  of these
   instruments  is  considered  to  be the earlier of the next date on which the
   security  can  be  redeemed  at  par,  or  the next date on which the rate of
   interest is adjusted.
 + Option  call  provisions:  date  (month/year)  and  price  of  the  earliest
   optional  call  or  redemption. There may be other call provisions at varying
   prices at later dates.
++ This bond is prerefunded. See glossary for definition.

<TABLE>
---------------------------------------------------------------------------------------------------------------------
<S>       <C>                                                  <C>      <C>
                          THE FOLLOWING ABBREVIATIONS ARE USED IN PORTFOLIO DESCRIPTIONS:
    AMBAC -  American Municipal Bond Assurance Corporation          FSA -  Financial Security Assurance
   CAPMAC -  Capital Markets Assurance Company                     GNMA -  Government National Mortgage Association
      ETM -  Escrowed to maturity                                  G.O. -  General Obligation
     FGIC -  Financial Guaranty Insurance Company                  MBIA -  Municipal Bond Insurance Association
     FRDD -  Floating Rate Daily Demand                          P.C.R. -  Pollution Control Revenue
---------------------------------------------------------------------------------------------------------------------
</TABLE>

                       See Notes to Financial Statements.

                                       7
<PAGE>


--------------------------------------------------------------------------------
THE BLACKROCK INVESTMENT
QUALITY MUNICIPAL TRUST INC.
STATEMENT OF ASSETS AND LIABILITIES
APRIL 30, 2000 (UNAUDITED)
--------------------------------------------------------------------------------

ASSETS
Investments, at value (cost $371,686,210) (Note 1) .    $370,925,779
Cash .................................................         9,887
Interest receivable ..................................     7,003,054
Other assets .........................................        22,970
                                                        ------------
                                                         377,961,690
                                                        ------------
LIABILITIES
Dividends payable-common stock .......................     1,201,240
Offering costs payable-preferred stock ...............       295,000
Investment advisory fee payable (Note 2) .............       109,525
Dividends payable-preferred stock ....................        91,721
Administration fee payable (Note 2) ..................        46,939
Other accrued expenses ...............................       175,257
                                                        ------------
                                                           1,919,682
                                                        ------------
NET INVESTMENT ASSETS ................................  $376,042,008
                                                        ============
Net investment assets were comprised of:
 Common stock:
  Par value (Note 4) .................................  $    167,071
  Paid-in capital in excess of par ...................   231,608,000
 Preferred stock (Note 4) ............................   146,550,000
                                                        ------------
                                                         378,325,071
 Undistributed net investment income .................       478,181
 Accumulated net realized loss .......................    (2,000,813)
 Net unrealized depreciation .........................      (760,431)
                                                        ------------
Net investment assets, April 30, 2000 ................  $376,042,008
                                                        ============
Net assets applicable to common shareholders .........  $229,492,008
                                                        ============
Net asset value per common share:
  ($229,492,008 (division sign) 16,707,093 shares of
  common stock issued and outstanding) ...............  $      13.74
                                                        ============


--------------------------------------------------------------------------------
THE BLACKROCK INVESTMENT
QUALITY MUNICIPAL TRUST INC.
STATEMENT OF OPERATIONS
SIX MONTHS ENDED APRIL 30, 2000 (UNAUDITED)
--------------------------------------------------------------------------------

NET INVESTMENT INCOME
Income
  Interest and discount earned ...........   $10,558,626
                                             -----------
Expenses
  Investment advisory ....................       640,078
  Administration .........................       274,319
  Auction agent ..........................       177,500
  Reports to shareholders ................        76,000
  Custodian ..............................        56,000
  Legal ..................................        36,000
  Independent accountants ................        28,000
  Directors ..............................        27,500
  Transfer agent .........................        14,500
  Registration ...........................        12,000
  Miscellaneous ..........................        31,118
                                             -----------
  Total expenses .........................     1,373,015
                                             -----------
Net investment income ....................     9,185,611
                                             -----------

REALIZED AND UNREALIZED LOSS
ON INVESTMENTS
Net realized loss on investments .........    (1,607,310)
Net change in unrealized depreciation
  on investments .........................      (799,417)
                                             -----------
Net loss on investments ..................    (2,406,727)
                                             -----------
NET INCREASE IN NET INVESTMENT ASSETS
RESULTING FROM OPERATIONS ................    $6,778,884
                                              ==========

                       See Notes to Financial Statements.

                                       8
<PAGE>


--------------------------------------------------------------------------------
THE BLACKROCK INVESTMENT QUALITY MUNICIPAL TRUST INC.
STATEMENTS OF CHANGES IN NET INVESTMENT ASSETS (UNAUDITED)
--------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                                                         SIX MONTHS            YEAR
                                                                                            ENDED              ENDED
                                                                                       APRIL 30, 2000     OCTOBER 31,1999
                                                                                      ----------------   ----------------
INCREASE (DECREASE) IN NET INVESTMENT ASSETS
<S>                                                                                    <C>                <C>
OPERATIONS:
 Net investment income ............................................................     $  9,185,611      $  18,196,259
 Net realized loss on investments .................................................       (1,607,310)          (312,281)
 Net change in unrealized depreciation on investments .............................         (799,417)       (26,729,799)
                                                                                        ------------      -------------
   Net increase (decrease) in net investment assets resulting from operations .....        6,778,884         (8,845,821)
                                                                                        ------------      -------------
DIVIDENDS AND DISTRIBUTIONS:
 To common shareholders from net investment income ................................       (7,207,182)       (14,414,299)
 To common shareholders from net realized gain on investments .....................                -         (2,504,280)
 To preferred shareholders from net investment income .............................       (2,695,072)        (4,036,417)
 To preferred shareholders from net realized gain on investments ..................                -           (703,888)
                                                                                        ------------      -------------
   Total dividends and distributions ..............................................       (9,902,254)       (21,658,884)
                                                                                        ------------      -------------
CAPITAL STOCK TRANSACTIONS:
 Net proceeds from additional issuance of preferred shares ........................       16,080,131                 --
                                                                                        ------------      -------------
   Total increase (decrease) ......................................................       12,956,761        (30,504,705)
                                                                                        ------------      -------------
NET INVESTMENT ASSETS
Beginning of period ...............................................................      363,085,247        393,589,952
                                                                                        ------------      -------------
End of period (including undistributed net investment income of $478,181 and
 $1,194,824, respectively) ........................................................     $376,042,008      $ 363,085,247
                                                                                        ============      =============
</TABLE>

                       See Notes to Financial Statements.

                                       9
<PAGE>


--------------------------------------------------------------------------------
THE BLACKROCK INVESTMENT QUALITY MUNICIPAL TRUST INC.
FINANCIAL HIGHLIGHTS (UNAUDITED)
--------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                  SIX MONTHS ENDED
                                                   APRIL 30, 2000       1999         1998         1997         1996         1995
                                                      --------        --------     --------     --------     --------     --------
<S>                                                   <C>             <C>          <C>          <C>          <C>          <C>
PER COMMON SHARE OPERATING PERFORMANCE:
Net asset value, beginning of period ..............   $  13.95        $  15.78     $  15.32     $  14.52     $  14.18     $  12.05
                                                      --------        --------     --------     --------     --------     --------
 Net investment income ............................        .55            1.09         1.08         1.08         1.09         1.10
 Net realized and unrealized gain
  (loss) on investments ...........................       (.14)          (1.63)         .70          .80          .34         2.16
                                                      --------        --------     --------     --------     --------     --------
Net increase (decrease) from investment
  operations ......................................        .41            (.54)        1.78         1.88         1.43         3.26
                                                      --------        --------     --------     --------     --------     --------
Dividends and distributions:
 Dividends from net investment income to:
  Common shareholders .............................       (.43)           (.86)        (.81)        (.78)        (.79)        (.82)
  Preferred shareholders ..........................       (.16)           (.24)        (.24)        (.27)        (.28)        (.31)
 Distributions from net realized gain on
  investments to:
  Common shareholders .............................         --            (.15)        (.20)        (.02)        (.01)          --
  Preferred shareholders ..........................         --            (.04)        (.07)        (.01)        (.01)          --
                                                      --------        --------     --------     --------     --------     --------
    Total dividends and distributions .............       (.59)          (1.29)       (1.32)       (1.08)       (1.09)       (1.13)
                                                      --------        --------     --------     --------     --------     --------
Capital change with respect to issuance
  of preferred shares .............................       (.03)             --           --           --           --           --
                                                      --------        --------     --------     --------     --------     --------
Net asset value, end of period* ...................   $  13.74        $  13.95     $  15.78     $  15.32     $  14.52     $  14.18
                                                      ========        ========     ========     ========     ========     ========
Per share market value, end of period* ............   $  12.50        $  13.13     $  15.44     $  13.38     $  12.44     $  12.00
                                                      ========        ========     ========     ========     ========     ========
TOTAL INVESTMENT RETURN+ ..........................      (1.47)%         (9.03)%      23.81%       14.39%       10.41%       24.01%
                                                      ========        ========     ========     ========     ========     ========
RATIOS TO AVERAGE NET ASSETS OF COMMON
 SHAREHOLDERS:
Expenses++ ........................................       1.16%+++        1.05%        1.04%        1.07%        1.12%        1.16%
Net investment income before preferred
  stock dividends++ ...............................       7.99%+++        7.21%        6.95%        7.42%        7.57%        8.36%
Preferred stock dividends .........................       2.34%+++        1.60%        1.53%        1.88%        1.97%        2.34%
Net investment income available to
  common shareholders .............................       5.65%+++        5.61%        5.42%        5.54%        5.60%        6.02%
SUPPLEMENTAL DATA:
Average net assets of common shareholders
  (in thousands) ..................................   $231,303        $252,536     $259,280     $243,947     $238,540     $219,740
Portfolio turnover ................................          7%             26%          46%         160%         164%         182%
Net assets of common shareholders,
  end of period (in thousands) ....................   $229,492        $233,085     $263,590     $255,926     $242,547     $236,990
Preferred stock outstanding (in thousands) ........   $146,550        $130,000     $130,000     $130,000     $130,000     $130,000
Asset coverage per share of preferred
  stock, end of period ............................   $ 64,149        $ 69,824     $ 75,690     $ 74,241     $ 71,644     $ 70,575
</TABLE>

----------

  * Net  asset value  and market value are published in BARRON'S on Saturday and
    THE WALL STREET JOURNAL on Monday.

 +  Total investment return is calculated assuming a purchase of common stock at
    the current  market price on the first day and a sale at the current  market
    price on the last day of the period reported.  Dividends and  distributions,
    if any, are assumed for purposes of this  calculation  to be  reinvested  at
    prices  obtained  under  the  Trust's  dividend   reinvestment  plan.  Total
    investment return does not reflect brokerage  commissions.  Total investment
    returns for periods less than one full year are not annualized

 ++ Ratios are calculated on the basis of income and expenses applicable to both
    the common and preferred stock relative to the average net assets of common
    shareholders.

+++ Annualized.

The  information above represents the unaudited operating performance data for a
share  of  common  stock outstanding, total investment return, ratios to average
net  assets  and  other  supplemental  data  for  the  periods  indicated.  This
information  has  been  determined  based upon financial information provided in
the financial statements and market value data for the Trust's common shares.

                       See Notes to Financial Statements.

                                       10
<PAGE>

--------------------------------------------------------------------------------
THE BLACKROCK INVESTMENT
QUALITY MUNICIPAL TRUST INC.
NOTES TO FINANCIAL STATEMENTS (UNAUDITED)
--------------------------------------------------------------------------------

NOTE 1. ORGANIZATION & ACCOUNTING POLICIES

The  BlackRock  Invest ment  Quality  Municipal  Trust Inc.  (the  "Trust")  was
organized  in  Maryland  on  November  19,  1992  as a  diversified,  closed-end
management  investment company.  The Trust's investment objective is to manage a
portfolio of investment  quality  securities while providing high current income
exempt from regular  Federal  income tax  consistent  with the  preservation  of
capital.  The  ability of issuers of debt  securities  held by the Trust to meet
their  obligations  may be  affected  by  economic  developments  in a  specific
industry  or  region.  No  assurance  can be given that the  Trust's  investment
objective will be achieved.

      The following is a summary of significant  accounting policies followed by
the Trust.

SECURITIES  VALUATION: Municipal  securities  (including commitments to purchase
such  securities  on  a  "when-issued"  basis) are valued on the basis of prices
provided  by  dealers  or  pricing  services  approved  by  the Trust's Board of
Directors.  In  determining the value of a particular security, pricing services
may  use  certain  information  with respect to transactions in such securities,
quotations  from  bond dealers, market transactions in comparable securities and
various  relationships  between securities in determining values. Any securities
or  other  assets  for  which  such  current  market  quotations are not readily
available  are valued at fair value as determined in good faith under procedures
established  by  and  under  the  general  supervision and responsibility of the
Trust's Board of Directors.

      Short-term  securities  which  mature  in  60  days  or less are valued at
amortized  cost,  if  their term to maturity from date of purchase is 60 days or
less.  Short-term  securities  with a term to maturity greater than 60 days from
the  date  of purchase are valued at current market quotations until maturity or
disposition.

SECURITIES  TRANSACTIONS  AND  INVESTMENT  INCOME:  Securities  transactions are
recorded  on trade date. Realized and unrealized gains and losses are calculated
on  the  identified cost basis. Interest income is recorded on the accrual basis
and  the  Trust  accretes  original  issue  discount  or  amortizes  premium  on
securities purchased using the interest method.

FEDERAL  INCOME  TAXES: It  is  the  Trust's  intention  to continue to meet the
requirements  of  the  Internal  Revenue Code applicable to regulated investment
companies  and  to  distribute  sufficient  net income to shareholders. For this
reason  and  because  substantially  all of the Trust's gross income consists of
tax-exempt interest, no Federal income tax provision is required.

DIVIDENDS   AND   DISTRIBUTIONS: The  Trust  declares  and  pays  dividends  and
distributions  to  common  shareholders  monthly from net investment income, net
realized   short-term  capital  gains  and  other  sources,  if  necessary.  Net
long-term  capital  gains,  if  any,  in  excess  of  loss  carryforwards may be
distributed   annually.   Dividends   and  distributions  are  recorded  on  the
ex-dividend  date.  Dividends  and  distributions  to preferred shareholders are
accrued and determined as described in Note 4.

ESTIMATES: The  preparation of financial statements in conformity with generally
accepted  accounting  principles  requires  management  to  make  estimates  and
assumptions  that  affect  the  reported  amounts  of assets and liabilities and
disclosure  of  contingent  assets  and liabilities at the date of the financial
statements  and  the  reported  amounts  of  revenues  and  expenses  during the
reporting period. Actual results could differ from those estimates.

DEFERRED  COMPENSATION  PLAN: Under a deferred compensation plan approved by the
Board  of  Directors on February 24, 2000, non-interested Directors may elect to
defer receipt of all or a portion of their annual compensation.

      Deferred  amounts earn a return as though  equivalent  dollar  amounts had
been  invested  in  common  shares  of other  BlackRock  funds  selected  by the
Directors.  This has the same  economic  effect as if the Directors had invested
the deferred amounts in such other BlackRock funds.

      The deferred  compensation  plan is not funded and obligations  thereunder
represent  general unsecured claims against the general assets of the Trust. The
Trust may, however,  elect to invest in common shares of those funds selected by
the Directors in order to match its deferred compensation obligations.

NOTE  2.  AGREEMENTS

The Trust has an Investment  Advisory Agreement with BlackRock  Advisors,  Inc.,
(the "Advisor"), which is a wholly-owned subsidiary of BlackRock, Inc., which in
turn is an indirect  majority-owned  subsidiary of PNC Financial Services Group,
Inc. The Trust has an  Administration  Agreement with Princeton  Administrators,
L.P. (the "Administrator"),  an indirect wholly-owned affiliate of Merrill Lynch
& Co., Inc.

      The  investment  advisory  fee paid to the Advisor is computed  weekly and
payable  monthly at an annual  rate of 0.35% of the Trust's  average  weekly net
investment assets. The

                                       11
<PAGE>


administration  fee  paid  to  the  Administrator  is  also  computed weekly and
payable  monthly  at  an  annual rate of 0.15% of the Trust's average weekly net
investment assets.

      Pursuant  to  the  agreements, the Advisor provides continuous supervision
of  the  investment portfolio and pays the compensation of officers of the Trust
who  are affiliated persons of the Advisor. The Administrator pays occupancy and
certain  clerical  and  accounting costs of the Trust. The Trust bears all other
costs and expenses.

NOTE 3. PORTFOLIO

Purchases and sales of investment  securities,  other than SECURITIES short-term
investments,  for the period ended April 30, 2000,  aggregated  $37,317,202  and
$23,794,433, respectively.

      The Federal income tax basis of the Trust's  investments at April 30, 2000
was  $371,767,432,  and  accordingly,  net unrealized  depreciation was $841,653
(gross      unrealized      appreciation-$8,006,662,       gross      unrealized
depreciation-$8,848,315).  HERE IT IS(gross unrealized  appreciation-$8,006,662,
gross unrealized depreciation-$8,848,315).

      For federal income tax purposes, the Trust had a capital loss carryforward
at  October  31,  1999 of  approximately  $315,000  which  will  expire in 2007.
Accordingly, no capital gain distribution is expected to be paid to shareholders
until net gains have been realized in excess of such amount.

NOTE  4.  CAPITAL

There are 200 million  shares of $.01 par value  common  stock  authorized.  The
Trust may classify or reclassify any unissued shares of common stock into one or
more series of preferred stock. Of the 16,707,093  common shares  outstanding at
April 30, 2000, the Advisor owned 7,205 shares. As of April 30, 2000, there were
5,862 shares of Preferred  Stock  outstanding  as follows:  Series  T7-3,262 and
Series  T28-2,600,  which  includes  662 shares of series T7 issued on March 10,
2000.

      On March 10, 2000, the Trust  reclassified  662 shares of common stock and
issued an additional  662 shares of Series T-7 preferred  stock.  The additional
shares  issued have  identical  rights and features of the  existing  Series T-7
perferred stock.  Estimated offering cost of $304,369 and underwriting  discount
of $165,500 have been charged to paid-in  capital in excess of par of the common
shares.

      Dividends  on  Series  T7  are cumulative at a rate which is reset every 7
days  based  on  the  results  of  an  auction. Dividends on Series T28 are also
cumulative  at  a  rate  which is reset every 28 days based on the results of an
auction.  Divi-dend  rates  ranged  from  3.30% to 5.90% during the period ended
April 30, 2000.

      The  Trust may not declare dividends or make other distributions on shares
of  common stock or purchase any such shares if, at the time of the declaration,
distribution,  or  purchase,  asset  coverage  with  respect  to the outstanding
Preferred Stock would be less than 200%.

      The  Preferred Stock is redeemable at the option of the Trust, in whole or
in  part, on any dividend payment date at $25,000 per share plus any accumulated
or  unpaid  dividends  whether  or  not  declared.  The  Preferred Stock is also
subject  to  mandatory  redemption  at $25,000 per share plus any accumulated or
unpaid  dividends,  whether or not declared, if certain requirements relating to
the  composition  of the assets and liabilities of the Trust as set forth in the
Articles of Incorporation are not satisfied.

      The  holders of Preferred Stock have voting rights equal to the holders of
common  stock (one vote per share) and will vote together with holders of shares
of  common stock as a single class. However, holders of Preferred Stock are also
entitled  to  elect  two  of  the Trust's directors. In addition, the Investment
Company  Act  of  1940  requires  that  along with approval by stockholders that
might  otherwise  be  required, the approval of the holders of a majority of any
outstanding  preferred  stock, voting separately as a class would be required to
(a)  adopt  any plan of reorganization that would adversely affect the preferred
stock,  and (b) take any action requiring a vote of security holders, including,
among  other  things,  changes  in the Trust's subclassification as a closed-end
investment company or changes in its fundamental investment restrictions.

NOTE 5. DIVIDENDS AND DISTRIBUTIONS

Subsequent  to April 30, 2000,  the Board of  Directors of the Trust  declared a
dividend from undistributed earnings of $0.0719 per common share payable June 1,
2000, to shareholders of record on May 15, 2000.

      For the  period  May 1,  2000  to May  31,  2000,  dividends  declared  on
Preferred Stock totalled $563,752 in aggregate for the two outstanding Preferred
Stock series.

                                       12
<PAGE>


--------------------------------------------------------------------------------
             THE BLACKROCK INVESTMENT QUALITY MUNICIPAL TRUST INC.
                           DIVIDEND REINVESTMENT PLAN
--------------------------------------------------------------------------------

     Pursuant   to   the   Trust's  Dividend  Reinvestment  Plan  (the  "Plan"),
shareholders  are  automatically enrolled to have all distributions of dividends
and  capital  gains reinvested by State Street Bank and Trust Company (the "Plan
Agent")  in  Trust  shares  pursuant  to the Plan. Shareholders who elect not to
participate  in the Plan will receive all distributions in cash paid by check in
United  States  dollars mailed directly to the shareholders of record (or if the
shares  are  held  in  street or other nominee name, then to the nominee) by the
transfer agent, as dividend disbursing agent.

     The  Plan  Agent  serves as agent for the shareholders in administering the
Plan.  After  the Trust declares a dividend or determines to make a capital gain
distribution,  the  Plan  Agent will, as agent for the participants, receive the
cash  payment  and use it to buy Trust shares in the open market on the New York
Stock  Exchange  or elsewhere for the participants' accounts. The Trust will not
issue any new shares under the Plan.

     Participants  in the Plan may withdraw from the Plan upon written notice to
the  Plan  Agent and will receive certificates for whole Trust shares and a cash
payment for any fraction of a Trust share.

     The  Plan  Agent's  fees  for the handling of the reinvestment of dividends
and  distributions will be paid by the Trust. However, each participant will pay
a  pro  rata  share  of  brokerage commissions incurred with respect to the Plan
Agent's  open  market purchases in connection with the reinvestment of dividends
and  distributions.  The  automatic  reinvestment of dividends and distributions
will  not  relieve participants of any federal income tax that may be payable on
such dividends or distributions.

     The  Trust  reserves the right to amend or terminate the Plan as applied to
any  dividend  or  distribution  paid subsequent to written notice of the change
sent  to  all  shareholders of the Trust at least 90 days before the record date
for  the dividend or distribution. The Plan also may be amended or terminated by
the  Plan Agent upon at least 90 days' written notice to all shareholders of the
Trust.  All  correspondence  concerning  the Plan should be directed to the Plan
Agent at (800) 699-1BFM. The address is on the front of this report.

                                       13
<PAGE>


--------------------------------------------------------------------------------
             THE BLACKROCK INVESTMENT QUALITY MUNICIPAL TRUST INC.
                             ADDITIONAL INFORMATION
--------------------------------------------------------------------------------

      ANNUAL MEETING OF TRUST SHAREHOLDERS.  There have been no material changes
in the Trust's investment  objectives or policies that have not been approved by
the  shareholders  or to its charter or by-laws or in the principal risk factors
associated  with  investment  in the  Trust.  There  have been no changes in the
persons who are  primarily  responsible  for the  day-to-day  management  of the
Trust's portfolio.

      The Annual Meeting of Trust  Shareholders was held May 18, 2000 to vote on
the following matters:


      (1)   To elect two Directors as follows:

            DIRECTOR                           CLASS        TERM      EXPIRING
                                               -----        ----      --------
            Richard E. Cavanagh ............     I         3 years      2003
            James Clayburn La Force, Jr. ...     I         3 years      2003

            Directors  whose term of office co beyond this meeting are Andrew F.
            Brimmer,  Kent Dixon,  Frank J.  Fabozzi,  Laurence D. Fink,  Walter
            Mondale and Ralph L. Schlosstein.

      (2)   To ratify the selection of Deloit Touche LLP as  independent  public
            accountants of the Trust for the year ending October 31, 2000.

      Shareholders  elected the two  Directors  and  ratified  the  selection of
      Deloitte & Touche LLP. The results of the voting was as follows:

                                                VOTES      VOTES
                                                 FOR*     AGAINST*  ABSTENTIONS*
                                              ----------  --------  ------------
      Richard E. Cavanagh                          4,600     --         --
      James Clayburn La Force, Jr.            14,000,011     --       263,556
      Ratification of Deloitte & Touche LLP   14,067,716   41,126     154,725


----------
*  The votes  represent  common and  preferred  shareholders  voting as a single
   class  except for the  election  of Richard E.  Cavanagh  who was  elected by
   preferred shareholders.

                                       14
<PAGE>


--------------------------------------------------------------------------------
             THE BLACKROCK INVESTMENT QUALITY MUNICIPAL TRUST INC.
                              INVESTMENT SUMMARY
--------------------------------------------------------------------------------

THE TRUST'S INVESTMENT OBJECTIVE

The  BlackRock  Investment  Quality Municipal Trust's investment objective is to
provide  high  current  income exempt from regular Federal income tax consistent
with the preservation of capital.

WHO MANAGES THE TRUST?

BlackRock  Advisors,  Inc.  (the  "Advisor")  is  an  SEC-registered  investment
advisor.  As  of  March  31,  2000,  the  Advisor  and its affiliates (together,
"BlackRock")  managed  $173  billion on behalf of taxable and tax-exempt clients
worldwide.  Strategies include fixed income, equity and cash and may incorporate
both  domestic  and  international  securities. Domestic fixed income strategies
utilize   the  government,  mortgage,  corporate  and  municipal  bond  sectors.
BlackRock  manages twenty-two closed-end funds that are traded on either the New
York  or  American  stock exchanges, and a $29 billion family of open-end funds.
BlackRock  manages  over  590  accounts,  domiciled  in  the  United  States and
overseas.

WHAT CAN THE TRUST INVEST IN?

Under  normal  conditions, the Trust expects to continue to manage its assets so
that  at least 80% of its investments are rated at least investment grade ("BBB"
by  Standard  &  Poor's  or "Baa" by Moody's Investor Services) and up to 20% of
its  assets  may  instead  be  deemed  to be of equivalent credit quality by the
Advisor.  Examples  of  the  types  of  securities  that the Trust may invest in
include  general  obligation bonds, which are backed by the full taxing power of
the  municipality  (states,  counties  and cities), and revenue bonds, which are
backed  by  a  revenue  source  associated with the issuing municipality or by a
special  tax.  Revenue bonds include those that are backed by revenues generated
by  universities, hospitals, housing developments, utilities, public facilities,
toll roads, airports, etc.

WHAT IS THE ADVISOR'S INVESTMENT STRATEGY?

The  Advisor  will manage the assets of the Trust in accordance with the Trust's
investment  objective and policies to seek to achieve its objective by investing
in  municipal  debt  securities  that  are  diversified  both geographically and
according  to  revenue  source. As such, the Advisor actively manages the assets
in  relation  to  market  conditions  and  interest rate changes. In seeking the
investment  objective,  the Trust does not expect to invest more than 25% of its
total  assets  in  municipals  that  are  issued by the same state. Depending on
yield  and portfolio allocation considerations, the Advisor may choose to invest
a  portion  of  the  Trust's  assets  in  securities  which pay interest that is
subject to AMT (alternative minimum tax).

Under  current market conditions the use of leverage increases the income earned
by  the  Trust.  The  Trust  employs  leverage primarily through the issuance of
preferred   stock.  Preferred  stockholders  will  receive  dividends  based  on
short-term  rates  in  exchange  for  allowing  the  Trust  to borrow additional
assets.  These  assets  will  be  invested in longer-term assets which typically
offer  higher  interest  rates  and  the  difference  between  the  cost  of the
dividends  paid  to  preferred  stockholders  and  the  interest  earned  on the
longer-term   securities   will   provide   higher   income  levels  for  common
stockholders  in  most  interest rate environments. See "Leverage Considerations
in the Trust" below.

                                       15
<PAGE>


HOW  ARE  THE  TRUST'S  SHARES  PURCHASED AND SOLD? DOES THE TRUST PAY DIVIDENDS
REGULARLY?

The  Trust's  shares  are  traded  on the New York Stock Exchange which provides
investors  with  liquidity on a daily basis. Orders to buy or sell shares of the
Trust  must  be  placed  through  a  registered broker or financial advisor. The
Trust  pays monthly dividends which are typically paid on the first business day
of  the  month.  For  shares  held  in  the shareholder's name, dividends may be
reinvested  in additional shares of the fund through the Trust's transfer agent,
State  Street  Bank  and  Trust  Company. Investors who wish to hold shares in a
brokerage  account  should  check  with  their  financial  advisor  to determine
whether their brokerage firm offers dividend reinvestment services.

LEVERAGE CONSIDERATIONS IN THE TRUST

Leverage  increases  the  duration  (or price sensitivity of the net assets with
respect  to  changes  in  interest  rates)  of  the Trust, which can improve the
performance  of  the  Trust  in  a declining rate environment, but can cause net
assets  to  decline  faster  in  a rapidly rising interest rate environment. The
Trust  may reduce, or unwind, the amount of leverage employed should the Advisor
consider  that reduction to be in the best interests of the Trust. The Advisor's
portfolio  managers continuously monitor and regularly review the Trust's use of
leverage  and  maintain  the  ability  to  unwind the leverage if that course is
chosen.

SPECIAL CONSIDERATIONS AND RISK FACTORS RELEVANT TO THE TRUST

THE  TRUST  IS  INTENDED  TO  BE  A LONG-TERM INVESTMENT AND IS NOT A SHORT-TERM
TRADING VEHICLE.

INVESTMENT  OBJECTIVE.  Although  the  objective of the Trust is to provide high
current  income  exempt  from  regular  Federal  income  tax consistent with the
preservation  of  capital, there can be no assurance that this objective will be
achieved.

DIVIDEND  CONSIDERATIONS.  The income and dividends paid by the Trust are likely
to  vary  over  time  as fixed income market conditions change. Future dividends
may be higher or lower than the dividend the Trust is currently paying.

LEVERAGE. The  Trust  utilizes leverage through the issuance of preferred stock,
which  involves  special risks. The Trust's net asset value and market value may
be more volatile due to its use of leverage.

MARKET  PRICE  OF SHARES.  The shares of closed-end investment companies such as
the  Trust  trade  on the New York Stock Exchange (NYSE symbol: BKN) and as such
are  subject to supply and demand influences. As a result, shares may trade at a
discount or a premium to their net asset value.

INVESTMENT  GRADE MUNICIPAL OBLIGATIONS.  The value of municipal debt securities
generally  varies  inversely  with  changes in prevailing market interest rates.
Depending  on  the  amount  of  call protection that the securities in the Trust
have,  the Trust may be subject to certain reinvestment risks in environments of
declining interest rates.

ILLIQUID  SECURITIES.  The  Trust  may  invest  in securities that are illiquid,
although  under  current  market conditions the Trust expects to do so to only a
limited extent. These securities involve special risks.

ANTITAKEOVER  PROVISIONS.  Certain antitakeover provisions will make a change in
the  Trust's  business  or management more difficult without the approval of the
Trust's  Board of Directors and may have the effect of depriving shareholders of
an  opportunity  to  sell  their shares at a premium above the prevailing market
price.

                                       16
<PAGE>


--------------------------------------------------------------------------------
             THE BLACKROCK INVESTMENT QUALITY MUNICIPAL TRUST INC.
                                   GLOSSARY
--------------------------------------------------------------------------------

CLOSED-END FUND:         Investment  vehicle  which  initially  offers  a  fixed
                         number of shares  and trades on a stock  exchange.  The
                         fund invests in a portfolio of securities in accordance
                         with its stated investment objectives and policies.

DISCOUNT:                When a fund's net asset value is greater than its stock
                         price the fund is said to be trading at a discount.

DIVIDEND:                Income  generated  by  securities  in a  portfolio  and
                         distributed  to  shareholders  after the  deduction  of
                         expenses.  This Trust  declares  and pays  dividends to
                         common shareholders on a monthly basis.

DIVIDEND REINVESTMENT:   Shareholders  may have all dividends and  distributions
                         of  capital   gains   automatically   reinvested   into
                         additional shares of a fund.

MARKET PRICE:            Price per share of a security  trading in the secondary
                         market.  For a  closed-end  fund,  this is the price at
                         which  one  share  of the  fund  trades  on  the  stock
                         exchange.  If you were to buy or sell shares, you would
                         pay or receive the market price.

NET ASSET VALUE (NAV):   Net  asset  value  is the  total  market  value  of all
                         securities  and other  assets  held by the Trust,  plus
                         income   accrued   on  its   investments,   minus   any
                         liabilities including accrued expenses,  divided by the
                         total  number  of   outstanding   shares.   It  is  the
                         underlying  value of a single share on a given day. Net
                         asset  value for the  Trust is  calculated  weekly  and
                         published  in BARRON'S on Saturday  and THE WALL STREET
                         JOURNAL on Monday.

PREMIUM:                 When a fund's stock price is greater than its net asset
                         value, the fund is said to be trading at a premium.

PREREFUNDED BONDS:       These securities are collateralized by U.S.  Government
                         securities which are held in escrow and are used to pay
                         principal  and  interest  on the tax  exempt  issue and
                         retire  the  bond  in  full  at  the  date   indicated,
                         typically at a premium to par.

                                       17
<PAGE>


--------------------------------------------------------------------------------
                           BLACKROCK ADVISORS, INC.
                          SUMMARY OF CLOSED-END FUNDS
--------------------------------------------------------------------------------

TAXABLE TRUSTS
--------------------------------------------------------------------------------

                                                                STOCK   MATURITY
                                                                SYMBOL    DATE
PERPETUAL TRUSTS                                                ------  --------
The BlackRock Income Trust Inc.                                   BKT      N/A
The BlackRock North American Government Income Trust Inc.         BNA      N/A
The BlackRock High Yield Trust                                    BHY      N/A

TERM TRUSTS
The BlackRock Target Term Trust Inc.                              BTT     12/00
The BlackRock 2001 Term Trust Inc.                                BTM     06/01
The BlackRock Strategic Term Trust Inc.                           BGT     12/02
The BlackRock Investment Quality Term Trust Inc.                  BQT     12/04
The BlackRock Advantage Term Trust Inc.                           BAT     12/05
The BlackRock Broad Investment Grade 2009 Term Trust Inc.         BCT     12/09

TAX-EXEMPT TRUSTS
--------------------------------------------------------------------------------
                                                                STOCK   MATURITY
                                                                SYMBOL    DATE
PERPETUAL TRUSTS                                                ------  --------
The BlackRock Investment Quality Municipal Trust Inc.             BKN      N/A
The BlackRock California Investment Quality Municipal Trust Inc.  RAA      N/A
The BlackRock Florida Investment Quality Municipal Trust          RFA      N/A
The BlackRock New Jersey Investment Quality Municipal Trust Inc.  RNJ      N/A
The BlackRock New York Investment Quality Municipal Trust Inc.    RNY      N/A
The BlackRock Pennsylvania Strategic Municipal Trust              BPS      N/A
The BlackRock Strategic Municipal Trust                           BSD      N/A

TERM TRUSTS
The BlackRock Municipal Target Term Trust Inc.                    BMN     12/06
The BlackRock Insured Municipal 2008 Term Trust Inc.              BRM     12/08
The BlackRock California Insured Municipal 2008 Term Trust Inc.   BFC     12/08
The BlackRock Florida Insured Municipal 2008 Term Trust           BRF     12/08
The BlackRock New York Insured Municipal 2008 Term Trust Inc.     BLN     12/08
The BlackRock Insured Municipal Term Trust Inc.                   BMT     12/10

      IF YOU WOULD LIKE FURTHER INFORMATION PLEASE DO NOT HESITATE TO CALL
   BLACKROCK AT (800) 227-7BFM (7236) OR CONSULT WITH YOUR FINANCIAL ADVISOR.

                                       18
<PAGE>


--------------------------------------------------------------------------------
                            BLACKROCK ADVISORS, INC.
                                  AN OVERVIEW
--------------------------------------------------------------------------------

      BlackRock Advisors,  Inc. (the "Advisor") is an SEC-registered  investment
advisor.  As of March  31,  2000,  the  Advisor  and its  affiliates  (together,
"BlackRock")  managed $173 billion on behalf of taxable and  tax-exempt  clients
worldwide.  Strategies include fixed income, equity and cash and may incorporate
both  domestic  and  international  securities.   BlackRock  manages  twenty-two
closed-end  funds  that are  traded on  either  the New York or  American  stock
exchanges,  and a $29 billion family of open-end funds.  BlackRock  manages over
590 accounts, domiciled in the United States and overseas.

      BlackRock's  fixed  income  product  was  introduced  in 1988 by a team of
highly seasoned fixed income  professionals.  These  professionals had extensive
experience   creating,   analyzing   and  trading  a  variety  of  fixed  income
instruments,  including the most complex structured securities. In fact, several
individuals  at BlackRock  were  responsible  for  developing  many of the major
innovations  in  the  mortgage-backed   and  asset-backed   securities  markets,
including   the  creation  of  the  first  CMO,  the  floating   rate  CMO,  the
senior/subordinated pass-through and the multi-class asset-backed security.

      BlackRock  is unique  among asset  management  and  advisory  firms in the
emphasis it places on the  development of proprietary  analytical  capabilities.
Over one  quarter of the  firm's  professionals  are  dedicated  to the  design,
maintenance  and use of these  systems,  which are not  otherwise  available  to
investors. BlackRock's proprietary analytical tools are used for evaluating, and
designing fixed income investment  strategies for client portfolios.  Securities
purchased include mortgages,  corporate bonds,  municipal bonds and a variety of
hedging instruments.

      BlackRock  has  developed  investment  products that respond to investors'
needs and has been  responsible  for several  major  innovations  in  closed-end
funds. In fact,  BlackRock  introduced the first  closed-end  mortgage fund, the
first taxable and tax-exempt  closed-end funds to offer a finite term, the first
closed-end  fund to  achieve a AAA rating by  Standard  & Poor's,  and the first
closed-end  fund to invest  primarily in North American  Government  securities.
Currently,  BlackRock's closed-end funds have dividend reinvestment plans, which
are designed to provide  ongoing  demand for the stock in the secondary  market.
BlackRock  manages a wide range of  investment  vehicles,  each having  specific
investment objectives and policies.

      In view of our continued  desire to provide a high level of service to all
our shareholders, BlackRock maintains a toll-free number for your questions. The
number is (800) 227-7BFM (7236).  We encourage you to call us with any questions
that you may have about your BlackRock  funds and we thank you for the continued
trust that you place in our abilities.


                     IF YOU WOULD LIKE FURTHER INFORMATION
           PLEASE DO NOT HESITATE TO CALL BLACKROCK AT (800) 227-7BFM

                                       19
<PAGE>


---------
BlackRock
---------

DIRECTORS
Laurence D. Fink, CHAIRMAN
Andrew F. Brimmer
Richard E. Cavanagh
Kent Dixon
Frank J. Fabozzi
James Clayburn La Force, Jr.
Walter F. Mondale
Ralph L. Schlosstein

OFFICERS
Ralph L. Schlosstein, PRESIDENT
Keith T. Anderson, VICE PRESIDENT
Michael C. Huebsch, VICE PRESIDENT
Robert S. Kapito, VICE PRESIDENT
Kevin Klingert, VICE PRESIDENT
Richard M. Shea, VICE PRESIDENT/TAX
Henry Gabbay, TREASURER
James Kong, ASSISTANT TREASURER
Karen H. Sabath, SECRETARY

INVESTMENT ADVISOR
BlackRock Advisors, Inc.
400 Bellevue Parkway
Wilmington, DE 19809
(800) 227-7BFM

ADMINISTRATOR
Princeton Administrators, L.P.
P.O. Box 9095
Princeton, NJ 08543-9095
(800) 543-6217

CUSTODIAN AND TRANSFER AGENT
State Street Bank and Trust Company
One Heritage Drive
North Quincy, MA 02171
(800) 699-1BFM

AUCTION AGENT
Deutsche Bank
4 Albany Street
New York, NY 10006

INDEPENDENT ACCOUNTANTS
Deloitte & Touche LLP
Two World Financial Center
New York, NY 10281-1434

LEGAL COUNSEL
Skadden, Arps, Slate, Meagher & Flom LLP
Four Times Square
New York, NY 10036

LEGAL COUNSEL - INDEPENDENT DIRECTORS
Debevoise & Plimpton
875 Third Avenue
New York, NY 10022

      The  accompanying  financial  statements  as of April  30,  2000  were not
audited and accordingly, no opinion is expressed on them.

      This  report  is for  shareholder  information.  This is not a  prospectus
intended for use in the purchase or sale of any securities.


                        THE BLACKROCK INVESTMENT QUALITY
                              MUNICIPAL TRUST INC.
                       c/o Princeton Administrators, L.P.
                                 P.O. Box 9095
                            Princeton, NJ 08543-9095
                                 (800) 543-6217




[RECYCLE LOGO] Printed on recycled paper                              09247D-105
                                                                      09247D-204
                                                                      09247D-303


     ---------
     BlackRock
THE  ---------
INVESTMENT QUALITY
MUNICIPAL TRUST INC.
----------------------------------------------------------------------------
SEMI-ANNUAL REPORT
APRIL 30, 2000





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