BLACKROCK INVESTMENT QUALITY MUNICIPAL TRUST INC
N-30D, 1999-07-01
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- --------------------------------------------------------------------------------
             THE BLACKROCK INVESTMENT QUALITY MUNICIPAL TRUST INC.
                       SEMI-ANNUAL REPORT TO SHAREHOLDERS
                          REPORT OF INVESTMENT ADVISER
- --------------------------------------------------------------------------------

                                                                    May 31, 1999




Dear Shareholder:

     Since  the  Trust's  last  report,  interest  rates  rose  sharply  as U.S.
economic  growth  remained  strong,  labor  markets  tightened and international
markets  began  to  recover. In light of these factors, on May 18 members of the
Federal  Reserve's Federal Open Market Committee announced that they had adopted
a  bias  towards  higher  interest  rates, citing a concern that inflation might
start to accelerate.

     BlackRock  has  adopted  a  cautious view of the bond market, as we believe
that  there  is  a real possibility that the Federal Reserve will raise interest
rates  in  the  near  future. Additionally, because the Treasury yield curve has
already  priced  in  Federal Reserve action, we believe that interest rates will
trade in a relatively narrow range until the economy shows signs of slowing.

     This  report  contains  comments  from  your Trust's managers regarding the
markets  and  portfolio  in  addition  to the Trust's financial statements and a
detailed  portfolio  listing.  We thank you for your continued investment in the
Trust.


Sincerely,


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


                                       1

<PAGE>

                                                                   May 31, 1999




Dear Shareholder:

     We  are  pleased  to  present  the  semi-annual  report  for  The BlackRock
Investment  Quality  Municipal Trust Inc. (the "Trust") for the six months ended
April  30,  1999.  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 period:

<TABLE>
<CAPTION>
                         ----------------------------------------------------------------
                           4/30/99       10/31/98      CHANGE         HIGH          LOW
<S>                      <C>           <C>           <C>          <C>           <C>
 STOCK PRICE             $ 15.1875     $ 15.4375      (1.62%)     $ 16.0625     $ 14.9375
- ------------------------------------------------------------------------------------------
 NET ASSET VALUE (NAV)   $ 15.42       $ 15.78        (2.28%)     $ 15.79       $ 15.40
- ------------------------------------------------------------------------------------------
</TABLE>

THE FIXED INCOME MARKETS

     The  past  six  months have witnessed continued rapid expansion of the U.S.
economy.  GDP  growth  for  the  first quarter of 1999 is estimated at an annual
rate  above 4%, far exceeding the historical non-inflationary level of 2%. While
BlackRock  believes  that  growth  may  slow down in the second half of 1999, we
anticipate  GDP  to  remain  above  3% for the year. Despite the strong economic
growth,  inflation  has  stayed  surprisingly  subdued.  A significant factor in
maintaining  low  inflation  in  the  U.S.  economy  stems  from the increase in
industrial  productivity. Higher productivity has allowed manufacturers to avoid
price increases despite tight labor markets.

     The  Treasury  market  briefly  rallied early in the fourth quarter of 1998
before  dramatically reversing in 1999. For the semi-annual period, the yield of
the  10-year  Treasury  security rose from 4.61% on October 31, 1998 to 5.35% on
April  30,  1999.  The  weakened  performance  of  the  Treasury  market  can be
attributed  to investors leaving the safe haven of Treasuries to purchase credit
sensitive  or  higher  yielding  securities in relation to inflationary concerns
voiced by the Federal Reserve.

     Municipal  bonds  outperformed  the taxable domestic bond market during the
past  six  months,  returning  1.55% (as measured by the Lehman Municipal Index)
versus  the  Lehman  Aggregate Index's 0.68% on a pre-tax basis. The main forces
behind  municipal  bond outperformance were the strongest mutual fund inflows in
five  years  and  the reduction of municipal bond supply (due to higher interest
rates)  after the second highest year of issuance ($284 billion issued in 1998.)
We  believe  that  municipals currently offer attractive value versus Treasuries
and   our   outlook  for  municipal  securities  is  favorable.  Despite  recent
outperformance  we  still  feel  that  the  attractive taxable equivalent yields
offered by municipal securities are compelling.


                                       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.  At  the  end of the semi-annual period, the Trust's leverage amount was
34%  of  total  assets.  During the past six months, the Trust's borrowing costs
have remained favorable.

     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, 1998
asset composition and credit quality allocations:

                               SECTOR BREAKDOWN
- -------------------------------------------------------------------------------
<TABLE>
<CAPTION>
 SECTOR                             APRIL 30, 1999   OCTOBER 31, 1998
- -------------------------------------------------------------------------------
<S>                                       <C>               <C>
  Transportation                          20%               18%
- -------------------------------------------------------------------------------
  City, County & State                    18%               17%
- -------------------------------------------------------------------------------
  Hospital                                14%               12%
- -------------------------------------------------------------------------------
  Industrial & Pollution Control           9%               13%
- -------------------------------------------------------------------------------
  Power                                    8%                8%
- -------------------------------------------------------------------------------
  University/School                        7%                7%
- -------------------------------------------------------------------------------
  Lease Revenue                            6%                6%
- -------------------------------------------------------------------------------
  Housing                                  5%                5%
- -------------------------------------------------------------------------------
  Water & Sewer                            5%                5%
- -------------------------------------------------------------------------------
  Miscellaneous Revenue                    3%                1%
- -------------------------------------------------------------------------------
  Resource Recovery                        2%                2%
- -------------------------------------------------------------------------------
  Special District                         1%                --
- -------------------------------------------------------------------------------
  Tax Revenue                              1%                6%
- -------------------------------------------------------------------------------
  Utility                                  1%                --
- -------------------------------------------------------------------------------
</TABLE>


<TABLE>
<CAPTION>
- -------------------------------------------------------------------------------
           CREDIT RATING*              APRIL 30, 1999      OCTOBER 31, 1998
- -------------------------------------------------------------------------------
<S>                                          <C>                 <C>
              AAA/Aaa                        62%                 58%
- -------------------------------------------------------------------------------
               AA/Aa                         17%                 12%
- -------------------------------------------------------------------------------
                A/A                          12%                 15%
- -------------------------------------------------------------------------------
              BBB/Baa                         9%                 15%
- -------------------------------------------------------------------------------
</TABLE>

- ----------
* 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  contact our
marketing  center  at (800) 227-7BFM (7236) if you have specific questions which
were not addressed in this report.



Sincerely,


/s/ Robert S. Kapito                   /s/ Kevin Klingert
- --------------------                   -------------------


Robert S. Kapito                       Kevin Klingert
Vice Chairman and Portfolio Manager    Managing Director and Portfolio Manager
BlackRock Financial Management, Inc.   BlackRock Financial Management, 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 4/30/99:                          $ 15.1875
- --------------------------------------------------------------------------------
  Net Asset Value as of 4/30/99:                              $ 15.42
- --------------------------------------------------------------------------------
  Yield on Closing Stock Price as of 4/30/99 ($15.1875)1:        5.68%
- --------------------------------------------------------------------------------
  Current Monthly Distribution per Share2:                    $  0.0719
- --------------------------------------------------------------------------------
  Current Annualized Distribution per Share2:                 $  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 The Distribution is not constant and is subject to change.

                                       4



<PAGE>

- --------------------------------------------------------------------------------
THE BLACKROCK INVESTMENT QUALITY MUNICIPAL TRUST INC.
PORTFOLIO OF INVESTMENTS APRIL 30, 1999 (UNAUDITED)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
        PRINCIPAL
         AMOUNT                                                                                       OPTION CALL          VALUE
RATING*  (000)                                DESCRIPTION                                             PROVISIONS+         (NOTE 1)
====================================================================================================================================
<S>   <C>        <C>                                                                                  <C>              <C>
                 LONG-TERM INVESTMENTS-147.8%
                 CALIFORNIA-12.7%
 Aa2  $ 1,220    California Hsg. Fin. Agcy. Rev., Home Mtg., Ser. C, 5.65%, 8/01/14 .................   2/04 at 102     $ 1,259,626
 Aa3    5,770    California St. G.O., 5.00%, 10/01/14 ...............................................  10/07 at 101       5,879,688
 AAA   15,460    Los Angeles Cnty. Asset Leasing Corp. Rev., 5.95%, 12/01/07, AMBAC .................  No Opt. Call      17,465,935
                 University of California Rev., Research Fac., Ser. B,
 AAA    2,000++   6.10%, 9/01/03 ....................................................................      N/A            2,231,800
 AAA    3,305++   6.20%, 9/01/03 ....................................................................      N/A            3,701,170
 AAA    2,000++   6.25%, 9/01/03 ....................................................................      N/A            2,243,700
                                                                                                                        -----------
                                                                                                                         32,781,919
                                                                                                                        -----------
                 COLORADO-13.5%
                 Arapahoe Cnty. Cap. Impvt. Hwy. Rev., Trust Fund, Ser. E,
 AAA    3,100     Zero Coupon, 8/31/04 .............................................................   No Opt. Call      2,506,908
                 Denver City & Cnty. Arpt. Rev.,
 AAA    1,000     Ser. A, 5.60%, 11/15/20, MBIA ....................................................   11/05 at 102      1,041,390
 BBB+   1,120     Ser. C, 6.65%, 11/15/05 ..........................................................   11/02 at 102      1,211,896
 BBB+   3,000     Ser. C, 6.50%, 11/15/06 ..........................................................   11/02 at 102      3,231,660
 AAA    3,705++   Ser. D, 7.00%, 11/15/01 ..........................................................       N/A           3,989,989
 BBB+  14,085     Ser. D, 7.00%, 11/15/25 ..........................................................   11/01 at 100     14,886,155
                 E-470 Pub. Hwy. Auth. Rev., Ser. B,
 AAA    3,000     Zero Coupon, 9/01/11, MBIA.. .....................................................   No Opt. Call      1,690,710
 AAA   10,000     Zero Coupon, 9/01/18, MBIA .......................................................   No Opt. Call      3,661,400
 AAA    2,250++   6.90%, 8/31/05 ...................................................................       N/A           2,659,522
                                                                                                                        -----------
                                                                                                                         34,879,630
                                                                                                                        -----------
                 CONNECTICUT-4.8%
 AA     8,750    Connecticut St. G.O., Ser. A, 5.50%, 11/15/08 .....................................   11/03 at 102      9,371,075
 Baa3   3,000    Mashantuchet Western Pequot Tribe, Spl. Rev., 5.50%, 9/01/28 ......................    9/09 at 101      2,988,180
                                                                                                                        -----------
                                                                                                                         12,359,255
                                                                                                                        -----------
                 DISTRICT OF COLUMBIA-2.0%
                 District of Columbia G.O., Ser. E, CAPMAC,
 AAA       70++   6.00%, 6/01/03 ...................................................................       N/A              76,791
 AAA    1,830     6.00%, 6/01/09 ...................................................................    6/03 at 102      1,960,699
 AAA    3,000    Washington D.C. Convention Ctr. Auth. Ded. Tax Rev., 5.25%, 10/01/17, AMBAC .......   10/08 at 101      3,052,860
                                                                                                                        -----------
                                                                                                                          5,090,350
                                                                                                                        -----------
                 FLORIDA-4.2%
 AAA    1,740    Florida Hsg. Fin. Agcy. Rev., Sngl. Fam. Mtg., Ser. 1994-A, 6.55%, 7/01/14, GNMA ..    1/05 at 102      1,847,271
 AA+    5,000    Florida St. Dept. Trans., Right of Way, Ser. A, 4.75%, 7/01/24 ....................    7/09 at 101      4,726,650
 BBB    4,000    Santa Rosa Bay Bridge Auth. Rev., 6.25%, 7/01/28 ..................................    7/06 at 102      4,356,120
                                                                                                                        -----------
                                                                                                                         10,930,041
                                                                                                                        -----------
                 GEORGIA-1.5%
 A      3,000    Burke Cnty. Dev. Auth. P.C.R., Pwr. Co., Plant Vogtle, 3rd Ser., 5.45%, 5/01/34 ...    5/04 at 102      2,973,030
 AAA      920    Georgia St. Hsg. & Fin. Auth. Rev., Sngl. Fam. Mtg., Ser. C, 7.00%, 12/01/15, FHA..    6/99 at 100        981,180
                                                                                                                        -----------
                                                                                                                          3,954,210
                                                                                                                        -----------
                 ILLINOIS-9.7%
 AAA     2,500   Chicago Waste Wtr. Transmission Rev., 5.125%, 1/01/25, FGIC . .....................    1/06 at 102      2,446,025
 AAA     5,050   Chicago Wtr. Rev., 5.25%, 11/01/23, FGIC. .........................................   11/07 at 102      5,063,887
 AAA     3,000++ Cook Cnty. Cap. Impt. 5.875%, 11/15/06, FGIC ......................................       N/A           3,347,460
 AAA     4,165   Cook Cnty. G.O., Ser. A, 5.20%, 11/15/08, MBIA ....................................   11/07 at 101      4,436,808
                 Illinois Edl. Fac. Auth. Rev., Loyola Univ., FGIC,
 AAA     5,000++  5.70%, 7/01/05 ...................................................................       N/A           5,335,100
 AAA     4,000    5.45%, 7/01/14 ...................................................................    7/03 at 102      4,230,440
                                                                                                                        -----------
                                                                                                                         24,859,720
                                                                                                                        -----------
                 INDIANA-3.3%
 BBB     7,595   Indianapolis Arpt. Auth. Rev., Spl. Fac. Fed. Express Corp. Proj., 7.10%, 1/15/17..    7/04 at 102      8,501,919
                                                                                                                        -----------
                 KENTUCKY-7.4%
 AAA     2,850   Boone Cnty. P.C.R., 5.50%, 1/01/24, MBIA ..........................................    1/04 at 102      2,937,466
 AAA    15,000   Kentucky St. Tpke. Auth., Econ. Dev. Road Rev., 5.75%, 7/01/13, AMBAC .............    7/03 at 102     16,051,350
                                                                                                                        -----------
                                                                                                                         18,988,816
                                                                                                                        -----------
</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>
                LOUISIANA-7.4%
 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     $15,893,856
 AAA   2,860++  Louisiana Stadium & Expo Dist., Htl. Ocpcy. Tax, 6.00%, 7/01/06, FGIC ..................        N/A       3,221,418
                                                                                                                        -----------
                                                                                                                         19,115,274
                                                                                                                        -----------

                 MARYLAND-5.4%
 Aa2   9,940     Maryland St. Dept. Hsg. & Comn. Dev. Admin., Sngl. Fam. Prog., Ser. 2, 6.55%, 4/01/26..    4/05 at 102  10,604,986
 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 at 102   3,427,920
                                                                                                                        -----------
                                                                                                                         14,032,906
                 MASSACHUSETTS-2.5%                                                                                     -----------
 AAA   6,500     Massachusetts St. Hlth. & Edl. Fac. Auth. Rev., Hallmark Hlth. Sys., Ser. A, 5.00%,
                  7/01/21, FSA .........................................................................    7/08 at 101   6,304,935
                                                                                                                        -----------
       4,000     MICHIGAN-3.8%
 AAA             Greater Detroit Res. Rec. Auth. Rev., Ser. A, 6.25%, 12/13/08, AMBAC ..................   No Opt. Call   4,555,960
 AAA   5,000     River Rouge Sch. Dist., 5.625%, 5/01/22, FSA .......................................... 5/03 at 101.50   5,247,350
                                                                                                                        -----------
                                                                                                                          9,803,310
                 MISSOURI-1.7%                                                                                          -----------
                 Lake of the Ozarks Cmnty. Brdg. Corp., Brdg. Sys. Rev.,
 NR    2,000      5.25%, 12/01/14 ......................................................................   12/08 at 102   1,994,920
 NR    2,500      5.25%, 12/01/26 ......................................................................   12/08 at 102   2,457,800
                                                                                                                        -----------
                                                                                                                          4,452,720
                 NEVADA-1.6%                                                                                            -----------
 AAA   3,750     Washoe Cnty. Arpt. Auth., Arpt. Sys. Impvt. Rev., Ser. B, 5.80%, 7/01/09, MBIA ........    7/03 at 102   4,000,612
                                                                                                                        -----------
                 NEW YORK-26.2%
 AAA   5,400     Metropolitan Trans. Auth. Commuter Fac. Rev., Ser. A, 5.75%, 7/01/21, MBIA ............ 7/07 at 101.50   5,824,980
                  New York City G.O.,
 A     4,140      Ser. A, 6.00%, 8/01/05 ...............................................................   No Opt. Call   4,525,517
 AAA   3,000      Ser. D, 5.60%, 11/01/05, AMBAC. ......................................................   No Opt. Call   3,246,810
 A     7,000      Ser. E, 6.50%, 2/15/06 ...............................................................   No Opt. Call   7,861,560
 A     6,160++    Ser. H, 7.20%, 2/01/02 ...............................................................       N/A        6,801,441
 A       840      Ser. H, 7.20%, 2/01/13 ............................................................... 2/02 at 101.50     915,272
                 New York City Ind. Dev. Agcy. Spec. Fac. Rev., Term. One Group Assoc. Proj.,
 A     4,000      6.00%, 1/01/08 .......................................................................    1/04 at 102   4,293,480
 A     1,000      6.00%, 1/01/15 .......................................................................    1/04 at 102   1,064,250
 AAA   9,375     New York City Mun. Wtr. Fin. Auth., Wtr. & Swr. Rev., Ser. A, 5.125%, 6/15/22, AMBAC ...    6/07 at 101  9,366,094
 AA+   4,000     New York City Transitional Fin. Auth. Rev., Ser. C, 4.75%, 5/01/23 .....................    5/08 at 102  3,739,440
 AAA   3,000++   New York St. Dorm. Auth. Rev., St. Univ. Edl. Fac., Ser. B, 6.10%, 5/15/04. ............       N/A       3,353,910
 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  2,155,036
 AAA   5,000++   New York St. Med. Care Fac. Rev., Hosp., Ser. A, 6.60%, 2/15/05, AMBAC .................       N/A       5,741,100
 AAA   5,550     New York St. Twy. Auth., Svc. Contract Rev., Ser. B, 5.375%, 4/01/14, MBIA .............    4/08 at 101  5,824,725
 AAA   2,620     New York St. Urban Dev. Corp. Rev., Correctional Fac., 5.625%, 1/01/07, AMBAC ..........    1/03 at 102  2,792,003
                                                                                                                        -----------
                                                                                                                         67,505,618
                                                                                                                        -----------
                NORTH CAROLINA-2.3%
 AAA   5,000    North Carolina Eastn. Mun. Pwr. Agcy. Rev., Ser. B, 7.00%, 1/01/08, CAPMAC .............   No Opt. Call   5,901,000
                                                                                                                        -----------
                OHIO-0.7%
 NR      500    Cleveland Cuyahoga Cnty. Port Auth. Rev., Port Dev. Proj., 6.00%, 3/01/07 ..............   No Opt. Call     518,935
 AAA   1,220    Ohio St. Higher Edl. Fac. Com., Univ. Dayton Proj., 5.35%, 12/01/17, AMBAC .............   12/07 at 101   1,266,592
                                                                                                                        -----------
                                                                                                                          1,785,527
                OREGON-2.2%                                                                                             -----------
 NR    5,600    Klamath Falls Oregon Elec. Rev., Sr. Lien-Klamath Cogen, 5.50%, 1/01/07 ................   No Opt. Call   5,620,272
                                                                                                                        -----------
                PENNSYLVANIA-14.0%
 AAA   6,000    Delaware Valley Regl. Fin. Auth., Ser. A, 5.50%, 8/01/28, AMBAC ........................   No Opt. Call   6,421,440
 AAA  10,100    Lehigh Cnty. Gen. Purpose Auth., Rev., St. Lukes Hosp. Bethlehem Proj.,
       7,000      5.50%, 11/15/13, AMBAC ...............................................................   11/03 at 102  10,542,683
 AAA   4,000    Montgomery Cnty. Ed. & Hlth. Care Auth., Holy Redeemer, 5.25%, 10/01/23, AMBAC .........   10/07 at 101   7,080,500
 AAA   1,500    Pennsylvania Intergovernmental Coop. Auth., Spl. Tax Rev., Philadelphia Fdg. Prog.,
                  5.50%, 6/15/20, FGIC... ..............................................................    6/06 at 100   4,142,280
 AAA            Pennsylvania St. G.O., First Ser., 5.375%, 5/15/09, FGIC ............................... 5/06 at 101.50   1,601,325
                Pennsylvania St. Higher Edl. Fac. Auth., Hlth. Svcs. Rev.,
 AA    2,750      Ser. A, 5.875% 1/01/15 ...............................................................    1/06 at 101   2,894,568
 AA    3,300      Ser. A, 5.75%, 1/01/17 ...............................................................    1/06 at 101   3,461,865
                                                                                                                        -----------
                                                                                                                         36,144,661
                                                                                                                        -----------
</TABLE>

                       See Notes to Financial Statements.

                                       6



<PAGE>


<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------------------------------
           PRINCIPAL
            AMOUNT                                                                                  OPTION CALL          VALUE
 RATING*    (000)                            DESCRIPTION                                            PROVISIONS+         (NOTE 1)
===================================================================================================================================
<S>       <C>                                                                                    <C>
                    RHODE ISLAND-2.2%
 AA+      $3,430    Rhode Island Hsg. & Mtg. Fin., Homeownership Oppty., Ser. 15-B, 6.75%, 10/01/17 .... 4/04 at 102 $   3,657,443
 AAA       2,000    Rhode Island St. Hlth. & Edl. Bldg. Corp. Rev., Hosp. Fin., 5.50%, 5/15/16, MBIA ... 5/07 at 102     2,094,880
                                                                                                                     -------------
                    TENNESSEE - 3.3%
 A         7,800    Maury Cnty. Ind. Dev. Brd., P.C.R., Saturn Corp. Proj., 6.50%, 9/01/24 ............. 9/04 at 102    8,589,048
                    TEXAS- 1.1%
 A-        2,640    Sabine River Auth., P.C.R., Coll-Texas Utilities Elec. Proj., Ser. B,
                      8.25%, 10/01/20                                                                   10/00 at 102    2,822,424
                    UTAH-2.4%
 A+        1,800    Intermountain Pwr. Agcy. Rev., Fst. Crossover, Ser. 86 B, 5.00%, 7/01/16 ........... 6/99 at 100    1,751,112
 AAA       4,450    Intermountain Pwr. Agcy. Rev., Pwr. Supply, Ser. F, 5.00%, 7/01/13, AMBAC .......... 6/99 at 100    4,450,267
                                                                                                                     ------------
                    WASHINGTON-11.9%
 AA        6,900    Seattle G.O., 5.40%, 1/01/08 ....................................................... 1/03 at 102    7,293,645
 AA        2,650    Seattle Wtr. Sys. Rev., 5.50%, 6/01/18 ............................................. 6/03 at 102    2,702,708
 AA+       4,000    Washington St. G.O., Ser. A, 5.375%, 7/01/21 ....................................... 7/06 at 100    4,091,280
                    Washington St. Pub. Pwr. Supply Sys. Rev.,
 AAA      13,395     Nuclear Proj. No. 1, 5.75%, 7/01/11, MBIA ......................................... 7/06 at 102   14,466,868
 AAA       2,000     Nuclear Proj. No. 2, 5.55%, 7/01/10, FGIC ......................................... 7/03 at 102    2,115,660
                                                                                                                     ------------
                    Total Long-Term Investments (cost $357,158,166).....................................              381,048,030
                                                                                                                     ------------
                    SHORT-TERM INVESTMENTS**-1.2%
                    MISSOURI-0.4%
 Aa2         900    Jackson Cnty. P.C.R., 4.25%, 5/03/99, FRDD .........................................     N/A          900,000
                                                                                                                     ------------
                    WASHINGTON-0.8%
                    Washington St. Hlth. Care Fac. Auth. Rev., Sisters of Prov., FRDD,
 AA-         700     Ser. B, 4.25%, 5/03/99 ............................................................     N/A          700,000
 AA-       1,400     Ser. D, 4.25%, 5/03/99 ............................................................     N/A        1,400,000
                                                                                                                     ------------
                                                                                                                        2,100,000
                                                                                                                     ------------
                   Total Short-Term Investments (cost $3,000,000).......................................                3,000,000
                                                                                                                     ------------
                   TOTAL INVESTMENTS-149.0% (COST $360,158,166) ........................................              384,048,030
                   Other assets in excess of liabilities - 1.4% ........................................                3,642,439
                   Liquidation value of preferred stock-(50.4)% ........................................             (130,000,000)
                                                                                                                     ------------
                   NET ASSETS APPLICABLE TO COMMON SHAREHOLDERS-100% ..................................              $257,690,469
                                                                                                                     ============
</TABLE>

- ----------
 * Rating: 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  later 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 call or
   redemption.  There  may  be  other call provisions at varying prices at later
   dates.
++ This bond is prerefunded. See glossary for definition.


<TABLE>
<CAPTION>
- -------------------------------------------------------------------------------------------------------------------
                         THE FOLLOWING ABBREVIATIONS ARE USED IN PORTFOLIO DESCRIPTIONS
 <S>       <C>                                                 <C>      <C>
 AMBAC     -- American Municipal Bond Assurance Corporation     FSA      -- Financial Security Assurance
 CAPMAC    -- Capital Markets Assurance Corporation             GNMA     -- Government National Mortgage Association
 FGIC      -- Financial Guaranty Insurance Company              G.O.     -- General Obligation Bond
 FHA       -- Federal Housing Administration                    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, 1999 (UNAUDITED)
- --------------------------------------------------------------------------------

<TABLE>
<S>                                                      <C>
ASSETS
Investments, at value (cost $360,158,166) (Note 1) .      $384,048,030
Cash .................................................         467,459
Interest receivable ..................................       6,576,099
Other assets .........................................           9,515
                                                          ------------
                                                           391,101,103
                                                          ------------
LIABILITIES
Payable for investments purchased ....................       2,988,291
Investment advisory fee payable (Note 2) .............         112,527
Administration fee payable (Note 2) ..................          48,226
Dividends payable-preferred stock ....................          37,290
Other accrued expenses ...............................         224,300
                                                          ------------
                                                             3,410,634
                                                          ------------
NET INVESTMENT ASSETS ................................    $387,690,469
                                                          ============
Net investment assets were comprised of:
 Common stock:
  Par value (Note 4) .................................    $    167,071
  Paid-in capital in excess of par ...................     232,077,765
 Preferred stock (Note 4) ............................     130,000,000
                                                          ------------
                                                           362,244,836
 Undistributed net investment income .................       1,635,168
 Accumulated net realized loss .......................         (79,399)
 Net unrealized appreciation .........................      23,889,864
                                                          ------------
Net investment assets, April 30, 1999 ................    $387,690,469
                                                          ============
Net assets applicable to common shareholders .........    $257,690,469
                                                          ============
Net asset value per common share:
  ($257,690,469 o 16,707,093 shares of
  common stock issued and outstanding) ...............          $15.42
                                                                ======
</TABLE>

- --------------------------------------------------------------------------------
THE BLACKROCK INVESTMENT
QUALITY MUNICIPAL TRUST INC.
STATEMENT OF OPERATIONS
SIX MONTHS ENDED APRIL 30, 1999 (UNAUDITED)
- --------------------------------------------------------------------------------

<TABLE>
<S>                                          <C>
NET INVESTMENT INCOME
Income
  Interest and discount earned ...........   $10,493,252
                                             -----------
Expenses
  Investment advisory ....................       680,772
  Administration .........................       291,759
  Auction agent ..........................       171,000
  Custodian ..............................        41,500
  Reports to shareholders ................        36,500
  Directors ..............................        29,000
  Audit ..................................        19,000
  Transfer agent .........................        12,500
  Legal ..................................         4,000
  Miscellaneous ..........................        19,083
                                             -----------
  Total expenses .........................     1,305,114
                                             -----------
Net investment income ....................     9,188,138
                                             -----------

REALIZED AND UNREALIZED GAIN (LOSS)
ON INVESTMENTS (NOTE 3)
Net realized gain on investments .........         1,719
Net change in unrealized appreciation
  on investments .........................    (2,878,921)
                                             -----------
Net loss on investments ..................    (2,877,202)
                                             -----------

NET INCREASE IN NET INVESTMENT ASSETS
RESULTING FROM OPERATIONS ................   $ 6,310,936
                                             ===========
</TABLE>



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 APRIL 30,          ENDED
                                                                                    1999          OCTOBER 31, 1998
                                                                             -----------------   -----------------
INCREASE (DECREASE) IN NET INVESTMENT ASSETS
<S>                                                                           <C>                 <C>
Operations:
 Net investment income ...................................................     $   9,188,138       $  18,032,133
 Net realized gain on investments ........................................             1,719           3,208,243
 Net change in unrealized appreciation (depreciation) on investments .....        (2,878,921)          8,422,329
                                                                               -------------       -------------
 Net increase in net investment assets resulting from operations .........         6,310,936          29,662,705
Dividends and distributions:
 To common shareholders from net investment income .......................        (7,207,157)        (13,554,216)
 To common shareholders from net realized gain on investments ............        (2,504,280)         (3,343,299)
 To preferred shareholders from net investment income ....................        (1,795,094)         (3,967,577)
 To preferred shareholders from net realized gain on investments .........          (703,888)         (1,133,378)
                                                                               -------------       -------------
 Total dividends and distributions .......................................       (12,210,419)        (21,998,470)
                                                                               -------------       -------------
  Total increase (decrease) ..............................................        (5,899,483)          7,664,235
NET INVESTMENT ASSETS
Beginning of period ......................................................       393,589,952         385,925,717
                                                                               -------------       -------------
End of period ............................................................     $ 387,690,469       $ 393,589,952
                                                                               =============       =============
</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,
                                                                              1999
                                                                     ----------------------
<S>                                                                      <C>
PER SHARE OPERATING PERFORMANCE:
Net asset value, beginning of period ...............................     $     15.78
                                                                         -----------
 Net investment income .............................................             .55
 Net realized and unrealized gain (loss) on investments ............            (.18)
                                                                         -----------
Net increase (decrease) from investment operations .................             .37
                                                                         -----------
Dividends and distributions:
 Dividends from net investment income to:
  Common shareholders ..............................................            (.43)
  Preferred shareholders ...........................................            (.11)
 Distributions from net realized gain on investments to:
  Common shareholders ..............................................            (.15)
  Preferred shareholders ...........................................            (.04)
                                                                         -----------
    Total dividends and distributions ..............................            (.73)
                                                                         -----------
Capital charge with respect to issuance of common and
 preferred shares ..................................................              --
                                                                         -----------
Net asset value, end of period* ....................................     $     15.42
                                                                         ===========
Per share market value, end of period* .............................     $     15.19
                                                                         ===========
TOTAL INVESTMENT RETURN+ ..........................................            2.09%
                                                                         ===========
RATIOS TO AVERAGE NET ASSETS OF COMMON
 SHAREHOLDERS:++
Expenses ...........................................................            1.01%+++
Net investment income before preferred stock dividends .............            7.13%+++
Preferred stock dividends ..........................................            1.39%+++
Net investment income available to common shareholders .............            5.74%+++
SUPPLEMENTAL DATA:
Average net assets of common shareholders (in thousands) ...........     $   259,970
Portfolio turnover .................................................              20%
Net assets of common shareholders, end of period (in thousands).....     $   257,690
Preferred stock outstanding (in thousands) .........................     $   130,000
Asset coverage per share of preferred stock, end of period# ........     $    74,566



<CAPTION>
                                                                                    YEAR ENDED OCTOBER 31,
                                                                     ----------------------------------------------------
                                                                         1998         1997         1996         1995
                                                                     ------------ ------------ ------------ ------------
<S>                                                                  <C>          <C>          <C>          <C>
PER SHARE OPERATING PERFORMANCE:
Net asset value, beginning of period ...............................    $ 15.32      $ 14.52      $ 14.18    $  12.05
                                                                        -------      -------      -------    --------
 Net investment income .............................................       1.08         1.08         1.09        1.10
 Net realized and unrealized gain (loss) on investments ............        .70          .80          .34        2.16
                                                                        -------      -------      -------    --------
Net increase (decrease) from investment operations .................       1.78         1.88         1.43        3.26
                                                                        -------      -------      -------    --------
Dividends and distributions:
 Dividends from net investment income to:
  Common shareholders ..............................................       (.81)        (.78)        (.79)       (.82)
  Preferred shareholders ...........................................       (.24)        (.27)        (.28)       (.31)
 Distributions from net realized gain on investments to:
  Common shareholders ..............................................       (.20)        (.02)        (.01)         --
  Preferred shareholders ...........................................       (.07)        (.01)        (.01)         --
                                                                       --------     --------     --------    --------
    Total dividends and distributions ..............................      (1.32)       (1.08)       (1.09)      (1.13)
                                                                       --------     --------     --------    --------
Capital charge with respect to issuance of common and
 preferred shares ..................................................         --           --           --          --
                                                                       --------     --------     --------    --------
Net asset value, end of period* ....................................   $  15.78     $  15.32     $  14.52    $  14.18
                                                                       ========     ========     ========    ========
Per share market value, end of period* .............................   $  15.44     $  13.38     $  12.44    $  12.00
                                                                       ========     ========     ========    ========
TOTAL INVESTMENT RETURN+  ..........................................      23.81%       14.39%       10.41%      24.01%
                                                                       ========     ========     ========    ========
RATIOS TO AVERAGE NET ASSETS OF COMMON
 SHAREHOLDERS:++
Expenses ...........................................................       1.04%        1.07%        1.12%       1.16%
Net investment income before preferred stock dividends .............       6.95%        7.42%        7.57%       8.36%
Preferred stock dividends ..........................................       1.53%        1.88%        1.97%       2.34%
Net investment income available to common shareholders .............       5.42%        5.54%        5.60%       6.02%
SUPPLEMENTAL DATA:
Average net assets of common shareholders (in thousands) ...........   $259,280     $243,947     $238,540    $219,740
Portfolio turnover .................................................         46%         160%         164%        182%
Net assets of common shareholders, end of period (in thousands).....   $263,590     $255,926     $242,547    $236,990
Preferred stock outstanding (in thousands) .........................   $130,000     $130,000     $130,000    $130,000
Asset coverage per share of preferred stock, end of period# ........   $ 75,690     $ 74,241     $ 71,644    $ 70,575



<CAPTION>
                                                                        1994
                                                                     -----------
<S>                                                                   <C>
PER SHARE OPERATING PERFORMANCE:
Net asset value, beginning of period ...............................   $  14.76
                                                                       --------
 Net investment income .............................................       1.06
 Net realized and unrealized gain (loss) on investments ............      (2.64)
                                                                       --------
Net increase (decrease) from investment operations .................      (1.58)
                                                                       --------
Dividends and distributions:
 Dividends from net investment income to:
  Common shareholders ..............................................       (.90)
  Preferred shareholders ...........................................       (.21)
 Distributions from net realized gain on investments to:
  Common shareholders ..............................................         --
  Preferred shareholders ...........................................         --
                                                                       --------
    Total dividends and distributions ..............................      (1.11)
                                                                       --------
Capital charge with respect to issuance of common and
 preferred shares ..................................................       (.02)
                                                                       --------
Net asset value, end of period* ....................................   $  12.05
                                                                       ========
Per share market value, end of period* .............................   $  10.38
                                                                       =========
TOTAL INVESTMENT RETURN+ ..........................................      (20.98%)
                                                                       ========
RATIOS TO AVERAGE NET ASSETS OF COMMON
 SHAREHOLDERS:++
Expenses ...........................................................       1.14%
Net investment income before preferred stock dividends .............       7.80%
Preferred stock dividends ..........................................       1.55%
Net investment income available to common shareholders .............       6.25%
SUPPLEMENTAL DATA:
Average net assets of common shareholders (in thousands) ...........   $226,935
Portfolio turnover .................................................        210%
Net assets of common shareholders, end of period (in thousands).....   $201,343
Preferred stock outstanding (in thousands) .........................   $130,000
Asset coverage per share of preferred stock, end of period# ........   $127,440
</TABLE>

- ----------
 * Net  asset  value  and  market value are published in THE WALL STREET JOURNAL
   each Monday.
 # A stock split occurred on July 24, 1995 (Note 4).
 + 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 of less than one 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.  Ratios  do not reflect the effect of dividend payments
   to preferred shareholders.
+++Annualized.

The  information  above  represents  the  unaudited  operating performance 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 shares.


                       See Notes to Financial Statements.

                                       10



<PAGE>

- --------------------------------------------------------------------------------
THE BLACKROCK INVESTMENT
QUALITY MUNICIPAL TRUST INC.
NOTES TO FINANCIAL STATEMENTS (UNAUDITED)
- --------------------------------------------------------------------------------
NOTE 1. ORGANIZATION &                                  The  BlackRock   Invest-
ACCOUNTING                                              ment Quality   Municipal
POLICIES                                                Trust Inc. (the "Trust")
                                                        was  organized in  Mary-
land on November 19, 1992 as a  diversified,  closed-end  management  investment
company.  The Trust's  investment  objective  is to manage a  portfolio  of high
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   a  pricing  service  which  uses  information  with  respect  to
transactions  in  bonds,  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  more than 60 days are valued at
current  market  quotations.  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, or by amortizing their value on the 61st day prior
to  maturity,  if their original term to maturity from date of purchase exceeded
60 days.

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.



NOTE 2. AGREEMENTS                        The Trust has  an Investment  Advisory
Agreement  with  BlackRock  Financial  Management,   Inc.,  (the  "Adviser"),  a
wholly-owned  corporate  subsidiary  of BlackRock  Advisors,  Inc.,  which is an
indirect  majority-owned  subsidiary of PNC Bank,  N.A.,  and an  Administration
Agreement with Princeton Administrators, L.P. (the "Administrator"), an indirect
wholly-owned  subsidiary of Merrill Lynch & Co., Inc.

     The  investment  fee paid to the  Adviser is  computed  weekly and  payable
monthly at an annual rate of 0.35% of the Trust's  average weekly net investment
assets. The 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 Adviser provides continuous supervision of
the investment  portfolio and pays the compensation of officers of the Trust who
are  affiliated  persons of the Adviser.  The  Administrator  pays occupancy and
certain  clerical and accounting  costs of the Trust.  The Trust bears all other
costs and expenses.


NOTE 3.                                          Purchases and  sales of invest-
PORTFOLIO                                        ment  securities,   other  than
SECURITIES                                       short-term investments, for the
period   ended   April   30,   1999,  aggregated  $78,431,539  and  $81,362,169,
respectively.

     The federal  income tax basis of the Trust's  investments at April 30, 1999
was $360,239,387,  and accordingly,  net unrealized appreciation was $23,808,643
(gross      unrealized      appreciation-$23,950,863,      gross      unrealized
depreciation-$142,220).  HERE IT IS(gross  unrealized  appreciation-$23,950,863,
gross unrealized depreciation-$142,220).

                                       11



<PAGE>

NOTE 4. CAPITAL                                   There  are  200 million shares
                                                  of  $.01   par   value  common
stock authorized. Of the 16,707,093 common shares outstanding at April 30, 1999,
the Adviser owned 7,205 shares. As of April 30, 1999, there were 5,200 shares of
Preferred Stock outstanding as follows: Series T7-2,600 and Series T28-2,600.

      The  Trust  may classify or reclassify any unissued shares of common stock
into  one  or  more  series  of  preferred  stock.  On  April 1, 1993, the Trust
reclassified  2,600 shares of common stock and issued 2 series of Auction Market
Preferred  Stock  ("Preferred Stock") as follows: Series T7-1,300 shares, Series
T28-1,300  shares.  The  Preferred  Stock had a liquidation value of $50,000 per
share  plus  any  accumulated but unpaid dividends. On May 16, 1995 shareholders
approved  a proposal to split each share of the Trust's Auction Market Preferred
Stock  into  two  shares  and  simultaneously  reduce  each  share's liquidation
preference  from  $50,000  to  $25,000 per share plus any accumulated but unpaid
dividends. The stock split occurred on July 24, 1995.

      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 2.95% to 6.00% during the six months ended
April 30, 1999.

      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 shares, voting separately as a class would be required to
(a)  adopt  any plan of reorganization that would adversely affect the preferred
shares,  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                                 Subsequent to April 30, 1999,
AND DISTRIBUTIONS                                  1999, the Board of Directors
of the Trust  declared a dividend  from  undistributed  earnings  of $0.0719 per
common share payable May 28, 1999, to shareholders of record on May 14, 1999.

      For  the  period  May  1, 1999 through May 31, 1999, dividends declared on
Preferred   Stock  totalled  $368,907  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 American
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
- --------------------------------------------------------------------------------

     YEAR  2000  READINESS  DISCLOSURE. The Trust is currently in the process of
evaluating  its  information technology infrastructure for Year 2000 compliance.
Substantially  all  of  the  Trust's  information  systems  are  supplied by the
Adviser.  The  Adviser  has  advised  the  Trust that it is currently evaluating
whether  such systems are year 2000 compliant and that it expects to incur costs
of   up  to  approximately  five  hundred  thousand  dollars  to  complete  such
evaluation  and  to make any modifications to its systems as may be necessary to
achieve  Year  2000  compliance.  The  Adviser has advised the Trust that it has
fully  tested its systems for Year 2000 compliance. The Trust may be required to
bear  a portion of such cost incurred by the Adviser in this regard. The Adviser
has  advised  the  Trust  that it does not anticipate any material disruption in
the  operations  of  the  Trust  as  a  result  of any failure by the Adviser to
achieve  Year 2000 compliance. There can be no assurance that the costs will not
exceed  the  amount  referred  to  above or that the Trust will not experience a
disruption in operations.

     The  Adviser  has advised the Trust that it is in the process of evaluating
the  Year 2000 compliance of various suppliers of the Adviser and the Trust. The
Adviser  has  advised  the Trust that it has communicated with such suppliers to
determine  their Year 2000 compliance status and the extent to which the Adviser
or  the  Trust  could be affected by any supplier's Year 2000 compliance issues.
To  date,  the  Adviser  has  received  responses  from  all such suppliers with
respect  to  their  Year 2000 compliance, and there can be no assurance that the
systems  of  such  suppliers,  who  are beyond the Trust's control, will be Year
2000  compliant.  In  the event that any of the Trust's significant suppliers do
not  successfully  and timely achieve Year 2000 compliance, the Trust's business
or  operations  could  be  adversely affected. The Adviser has advised the Trust
that  it  is  in  the  process  of  preparing  a  contingency plan for Year 2000
compliance  by  its  suppliers.  There can be no assurance that such contingency
plan will be successful in preventing a disruption of the Trust's operations.

     The  Trust  is  designating  this  disclosure  as  its  Year 2000 readiness
disclosure  for  all  purposes  under  the  Year  2000 Information and Readiness
Disclosure  Act  and  the  foregoing  information  shall  constitute a Year 2000
statement for purposes of that Act.

     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 19, 1999 to vote on
the following matters:

     (1) To elect three Directors as follows:


<TABLE>
<CAPTION>
DIRECTOR                                                CLASS     TERM    EXPIRING
- ------------------------------------------------------ ------- --------- ---------
<S>                                                    <C>     <C>       <C>
     Andrew F. Brimmer ...............................   III   3 years     2002
     Kent Dixon ......................................   III   3 years     2002
     Laurence D. Fink ................................   III   3 years     2002

     Directors whose term of office continues beyond this meeting are Richard E.
     Cavanagh,  James Grosfeld,  Frank J. Fabozzi, James Clayburn La Force, Jr.,
     Walter F. Mondale and Ralph L. Schlosstein.
</TABLE>
   (2) To  ratify  the  selection of Deloitte & Touche LLP as independent public
       accountants of the Trust for the fiscal year ending October 31, 1999.

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

<TABLE>
<CAPTION>
                                                          VOTES FOR     VOTES AGAINST     ABSTENTIONS
                                                        ------------   ---------------   ------------
<S>                                                     <C>            <C>               <C>
     Andrew F. Brimmer ..............................   13,908,729           --            245,503
     Kent Dixon .....................................   13,911,170           --            243,062
     Laurence D. Fink ...............................   13,911,556           --            242,676
     Ratification of Deloitte & Touche LLP ..........   13,941,881         41,041          171,310
</TABLE>


                                       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   Financial   Management,  Inc.  ("BlackRock")  is  an  SEC-registered
investment  adviser.  BlackRock  and  its  affiliates currently manage over $141
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-one  closed-end  funds that are traded on either the New York or American
stock  exchanges,  and  a  $25 billion family of open-end equity and bond funds.
Current accounts number over 450, 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
Adviser.  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 ADVISER'S INVESTMENT STRATEGY?

The  Adviser  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 Adviser 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 Adviser 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. The Trust issued preferred
stock  to  leverage  the  portfolio  at  approximately  35%  of total assets. To
protect  the  common  stockholders  from  increases in the cost of the preferred
stock  dividends,  the  Trust  invests in securities called "additional interest
bonds"  or "embedded caps", which can help to limit the risk of increasing costs
of  leverage  in  a  rising interest rate or flattening yield curve environment.
These  bonds  pay  additional  interest when short-term municipal interest rates
rise  above  a  predetermined  rate,  or  "cap". These securities are used, when
available  in  the  marketplace,  to attempt to offset increases in the interest
paid  to  preferred  stockholders  and  may allow the Trust to maintain dividend
levels  to  common  stockholders  in  interest rate environments where the yield
curve  is  either  flat  or inverted. 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 last 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. 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 BlackRock
consider  that  reduction  to be in the best interests of the Trust. BlackRock'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.  As  mentioned above, the Trust will attempt to maintain a percentage of
its  investments in additional interest bonds which may help protect the Trust's
income from increases in the cost of leverage.


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

<TABLE>
<S>                      <C>
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.

EMBEDDED CAP BONDS:      Also known as additonal interest municipal bonds. These securities are intended
                         to protect the income that a fund earns through leverage from significant
                         increases in short-term rates. The coupon on these bonds will increase if short
                         term rates rise significantly.

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, THE NEW YORK TIMES
                         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.
</TABLE>






                                       17



<PAGE>

- --------------------------------------------------------------------------------
                     BLACKROCK FINANCIAL MANAGEMENT, INC.
                          SUMMARY OF CLOSED-END FUNDS
- --------------------------------------------------------------------------------
TAXABLE TRUSTS
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                              STOCK      MATURITY
                                                              SYMBOL        DATE
PERPETUAL TRUSTS                                            ----------   ---------
<S>                                                         <C>          <C>
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 1999 Term Trust Inc.                              BNN        12/99
The BlackRock Target Term Trust Inc.                            BTT        12/00
The BlackRock 2001 Term Trust Inc.                              BLK        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
</TABLE>

TAX-EXEMPT TRUSTS
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                                       STOCK      MATURITY
                                                                       SYMBOL       DATE
PERPETUAL TRUSTS                                                     ---------   ---------
<S>                                                                  <C>         <C>
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
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
</TABLE>

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 FINANCIAL MANAGEMENT, INC.
                                  AN OVERVIEW
- --------------------------------------------------------------------------------

     BlackRock  Financial  Management,  Inc.  ("BlackRock") is an SEC-registered
investment  adviser.  BlackRock  and  its  affiliates currently manage over $141
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-one closed-end funds that
are  traded  on  either  the  New  York  or  American stock exchanges, and a $25
billion  family  of open-end equity and bond funds. Current accounts number over
450, 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  is  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 Grosfeld
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 ADVISER
BlackRock Financial Management, Inc.
345 Park Avenue
New York, NY 10154
(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
Bankers Trust Company
4 Albany Street
New York, NY 10006

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

LEGAL COUNSEL
Skadden, Arps, Slate, Meagher & Flom LLP
919 Third Avenue
New York, NY 10022

     The  accompanying  financial  statements  as  of  April  30,  1999 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



=======================================

The  BLACKROCK
Investment Quality
Municipal Trust Inc.
=====================
Semi-Annual Report
April 30, 1999






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