BLACKROCK FLORIDA INVESTMENT QUALITY MUNICIPAL TRUST
N-30D, 1998-07-01
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- --------------------------------------------------------------------------------
            THE BLACKROCK FLORIDA INVESTMENT QUALITY MUNICIPAL TRUST
                       SEMI-ANNUAL REPORT TO SHAREHOLDERS
                          REPORT OF INVESTMENT ADVISER
- --------------------------------------------------------------------------------


                                                                    May 31, 1998

Dear Shareholder:

      Domestic  bonds  provided  investors  with modest total returns during the
past six months,  as interest rates generally  fell.  Supporting the bond market
was favorable inflation news and the belief that the Federal Reserve is unlikely
to raise short-term interest rates in the immediate future.

      U.S.  economic  growth has remained  relatively  robust,  spurred by lower
interest rates and strong consumer  demand.  However,  the economic  weakness of
Asia looms large.  While the fallout from the Asian fiscal  crisis  probably has
yet to  materialize  in the U.S., we expect a "slowdown" in Asia's  economies to
slow U.S.  growth in 1998.  While we expect that  interest  rates will be fairly
stable in the  near-term,  our  longer-term  outlook for the bond market remains
optimistic,  based on the fundamentally  favorable backdrop of low inflation,  a
currently high level of real yields, and declining Treasury borrowing.

      As you may know, the five investment  management  firms that comprised the
PNC Asset Management  Group have  consolidated  under BlackRock,  resulting in a
$118  billion  money  management  firm.  We look  forward  to using  our  global
investment management expertise to present exciting investment  opportunities to
closed-end fund shareholders in the future.

      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, 1998

Dear Shareholder:

      We are pleased to present the semi-annual report for The BlackRock Florida
Investment  Quality Municipal Trust ("the Trust") for the six months ended April
30, 1998.  We would like to take this  opportunity  to review the Trust's  stock
price and net asset value (NAV) performance,  summarize market  developments and
discuss recent portfolio management activity.

      The Trust is a  non-diversified,  actively  managed  closed-end  bond fund
whose shares are traded on the American  Stock  Exchange under the symbol "RFA".
The Trust's  investment  objective  is to provide  high  current  income that is
exempt from both  regular  federal  income tax and Florida  intangible  personal
property tax consistent  with the  preservation  of capital.  The Trust seeks to
achieve its objective by investing in investment  grade (rated "AAA" to "BBB" by
a major rating agency or of equivalent quality) municipal debt securities issued
by local municipalities throughout Florida.

      The table below  summarizes the performance of the Trust's stock price and
net asset value (the market value of its bonds per share) over the six months:

                      ----------------------------------------------------------
                         4/30/98     10/31/97    CHANGE    HIGH        LOW
- --------------------------------------------------------------------------------
STOCK PRICE               $13.87      $13.31      4.23%    $14.37    $13.0625
- --------------------------------------------------------------------------------
NET ASSET VALUE (NAV)     $15.17      $14.86      2.09%    $15.51    $14.77
- --------------------------------------------------------------------------------

      Additionally, on June 1, 1998, the Trust's Board of Directors announced an
increase  in the  Trust's  monthly  dividend  effective  with the July 31,  1998
payment.  The new dividend rate was increased from $0.06 to $0.0663 monthly,  or
from $0.720 to $0.796 annually.

THE FIXED INCOME MARKETS

      The first four months of 1998 have witnessed  continued rapid expansion of
the U.S.  economy.  GDP  growth  is  estimated  at an annual  rate of 4.2%,  far
exceeding  the  historical  non-inflationary  level of 2%.  Despite  the  strong
economic growth,  inflation stayed surprisingly subdued.  After rising only 1.7%
in 1997,  inflation inched higher at a 0.2% annual rate for the first quarter of
1998.  One  explanation  for the absence of inflation in the U.S.  economy stems
from the aftermath of the Asian crisis. U.S. exports to Asia have slowed,  while
the strength of the dollar caused cheaper Asian imports to flood the U.S. market
and exert downward price pressure on domestic goods.

      The Treasury  market  rallied  during the fourth  quarter of 1997 and into
1998  before  giving  back  some  gains  during  the  past few  months.  For the
semi-annual  period,  the yield of the 10-year Treasury security fell from 5.83%
on October 31, 1997 to 5.67% on April 30, 1998.  The strong  performance  of the
Treasury market was in response to moderating economic growth, low inflation and
a "flight to  quality"  from  investors  seeking a safe  haven in U.S.  Treasury
securities.  Continued  expectations  that the Asian  crisis will slow  economic
growth  and force the Fed to leave the  Federal  funds rate  unchanged  provided
additional  support  to the bond  market.  With  Treasury  supply  waning due to
surplus in the federal budget and increased foreign demand for Treasuries due to
their U.S. government backing and relatively  attractive yields, we anticipate a
positive environment for Treasuries for the balance of 1998.

      Municipal bonds underperformed the taxable domestic bond market during the
past six months,  returning  2.77% (as measured by the Lehman  Municipal  Index)
versus the Lehman  Aggregate  Index's 3.58% on a pre-tax basis.  The main forces


                                       2
<PAGE>

behind  municipal bond  underperformance  were  increased  municipal bond supply
(fueled  by the  lowest  municipal  interest  rates  since the 1960s) and retail
investors  focus  on  the  equity  markets.   We  believe  that  municipals  are
attractively  valued versus Treasuries and our outlook for municipal  securities
is favorable.  The robust economy  continues to strengthen the credit quality of
most  issuers,  and we expect  that the  attractive  taxable  equivalent  yields
offered by municipal securities should bring investors back into the market.

      Florida's  economy remains  strong,  particularly in the trade and service
sector,  and the State is projecting  1998's growth rate to be 2.3%. This growth
is in part fueled by the increasing population,  which grew nearly 2% in 1996 to
over 14 million  residents.  Additionally,  the tourism  industry has rebounded,
particularly in Dade County. Lastly,  Florida's fiscal year 1998 revenues, which
are heavily  dependent  on sales tax  receipts,  are ahead of  projections;  the
surplus could exceed last year's combined reserve fund of $1 billion.

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
33% of total assets.  During the past six months,  the Trust's  borrowing  costs
have remained favorable.

      Within the municipal  market, we find the best relative value on the yield
curve to be in the 14 to 17 year  sector of the yield  curve,  which we  believe
offers the most  attractive  taxable  equivalent  yields for the least amount of
incremental duration.  Additionally, the Trust has been emphasizing higher rated
credits (AA- and AAA-rated  issues) over lower rated credits (BBB and A) to take
advantage of  historically  narrow credit spreads between higher and lower rated
bonds.

      The  following  charts  compare the  Trust's  current and October 31, 1997
asset composition and credit quality allocations:

                                SECTOR BREAKDOWN
     -----------------------------------------------------------------------
        SECTOR                    APRIL 30, 1998     OCTOBER 31, 1997
     -----------------------------------------------------------------------
     Lease Revenue                     19%                 11%
     -----------------------------------------------------------------------
     Power                             17%                 17%
     -----------------------------------------------------------------------
     Transportation                    16%                 16%
     -----------------------------------------------------------------------
     City, County & State              13%                  8%
     -----------------------------------------------------------------------
     School                            12%                 12%
     -----------------------------------------------------------------------
     Sales Tax                          6%                  6%
     -----------------------------------------------------------------------
     Water & Sewer                      4%                  4%
     -----------------------------------------------------------------------
     Hospital                           4%                  4%
     -----------------------------------------------------------------------
     University                         4%                  4%
     -----------------------------------------------------------------------
     Housing                            3%                  4%
     -----------------------------------------------------------------------
     Other                              2%                  2%
     -----------------------------------------------------------------------
     Miscellaneous Revenue              --                  4%
     -----------------------------------------------------------------------
     Building                           --                  4%
     -----------------------------------------------------------------------
     Special tax                        --                  4%
     -----------------------------------------------------------------------


                                       3


<PAGE>


       -----------------------------------------------------------------------
       STANDARD & POOR'S/MOODY'S/FITCH'S
                 CREDIT RATING               APRIL 30, 1998   OCTOBER 31, 1997
       -----------------------------------------------------------------------
                  AAA/Aaa                        53%               53%
       -----------------------------------------------------------------------
                   AA/Aa                         16%               16%
      ------------------------------------------------------------------------
                    A/A                          18%               18%
      ------------------------------------------------------------------------
                  BBB/Baa                        13%               13%
      ------------------------------------------------------------------------
 
      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 Florida
Investment  Quality  Municipal  Trust.  Please  feel free to call our  marketing
center at (800) 227-7BFM  (7236) if you have any specific  questions  which were
not addressed in this report.

Sincerely,

/s/ Robert Kapito                        /s/ Kevin Klingert
- -----------------                        --------------------------------------
Robert Kapito                            Kevin Klingert
Vice Chairman and Portfolio Manager      Managing Director and Portfolio Manager
BlackRock Financial Management, Inc.     BlackRock Financial Management, Inc.


- --------------------------------------------------------------------------------
            THE BLACKROCK FLORIDA INVESTMENT QUALITY MUNICIPAL TRUST
- --------------------------------------------------------------------------------
   Symbol on American Stock Exchange:                                 RFA
- --------------------------------------------------------------------------------
   Initial Offering Date:                                        May 28, 1993
- --------------------------------------------------------------------------------
   Closing Stock Price as of 4/30/98:                               $13.875
- --------------------------------------------------------------------------------
   Net Asset Value as of 4/30/98:                                   $15.17
- --------------------------------------------------------------------------------
   Yield on Closing Stock Price as of 4/30/98 ($13.875)1:            5.19%
- --------------------------------------------------------------------------------
   Current Monthly Distribution per Share2:                          $0.06
- --------------------------------------------------------------------------------
   Current Annualized Distribution per Share2:                       $0.72
- --------------------------------------------------------------------------------

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>

<TABLE>
<CAPTION>
- ---------------------------------------------------------------------------------------------------------------------
THE BLACKROCK FLORIDA INVESTMENT QUALITY MUNICIPAL TRUST
PORTFOLIO OF INVESTMENTS APRIL 30, 1998 (UNAUDITED)
- ---------------------------------------------------------------------------------------------------------------------
         PRINCIPAL
          AMOUNT                                                                           OPTION CALL       VALUE
RATING*   (000)                             DESCRIPTION                                    PROVISIONS+     (Note 1)
- ---------------------------------------------------------------------------------------------------------------------
<S>        <C>       <C>                                                                  <C>             <C>
                     LONG-TERM INVESTMENTS--145.6%
                     FLORIDA--120.8%
                     Boynton Beach Util. Sys. Rev., FGIC,
AAA        $  170      6.25%, 11/01/20, ETM .............................................  No Opt. Call     $ 192,314
AAA           830      6.25%, 11/01/20 ..................................................  11/02 at 102       891,503
A1          1,000    Brevard Cnty. Hlth. Fac., Holmes Regl. Med. Ctr., 5.75%, 10/01/13 ..  10/03 at 102     1,038,370
AAA         1,000    Brevard Cnty. Sch. Brd., C.O.P., Ser. B, 5.50%, 7/01/21, AMBAC .....   7/06 at 102     1,020,520
AAA         1,000    Collier Cnty. Sch. Brd., C.O.P., 5.00%, 2/15/16, FSA ...............   2/06 at 101       972,250
AAA         1,000    Dade Cnty. Aviation Rev., Miami Int'l Arpt., Ser. C, 5.75%, 10/01/25, 
                       MBIA .............................................................  10/05 at 102     1,045,250
AAA         1,000    Dade Cnty. Sch. Brd., C.O.P., Ser. A, 6.00%, 5/01/14, MBIA .........   5/04 at 101     1,067,010
AAA         1,000    Dade Cnty. Spl. Oblig., Ser. B, Zero Coupon, 10/01/08, AMBAC++ .....        N/A          438,840
AAA         1,000    First Florida Gov. Fin. Comn. Rev., Gainsville, Hollywood
                       & St. Petersburg, 5.75%, 7/01/16, AMBAC ..........................   7/06 at 101     1,049,480
AAA           800    Florida Hsg. Fin. Agcy., Sngl. Fam. Mtge., Ser. A, 6.25%, 7/01/11, 
                       GNMA .............................................................   7/04 at 102       854,672
AA+         1,000    Florida St. Brd. of Ed., Pub. Ed., Ser. B, 5.875%, 6/01/24 .........   6/05 at 101     1,036,070
AA          1,000    Florida St. Brd. of Ed., Ser. C, 5.85%, 6/01/18 ....................   6/03 at 101     1,030,600
AAA           500    Florida St. Dept. of Corrections, C.O.P., Okeechobee Correctional
                       Fac.,  6.25%, 3/01/15, AMBAC .....................................   3/05 at 102       551,715
AA+         1,000    Florida St. Dept. of Trans., 5.80%, 7/01/21 ........................   7/05 at 101     1,038,140
AAA         1,000    Florida St. Div. of Bond Fin. Dept., Gen. Svcs. Rev., Dept. 
                       of Environ. Preservation, Ser. A, 5.75%, 7/01/11, AMBAC ..........   7/05 at 101     1,061,470
AAA         1,000    Jacksonville Cap. Impvt. Rev., Gator Bowl Proj., 5.50%, 10/01/14, 
                      AMBAC .............................................................  10/04 at 101     1,036,440
AAA         1,000    Lee Cnty. Trans. Fac. Rev., 5.75%, 10/01/22, MBIA ..................  10/05 at 102     1,044,490
A-          1,000    Orlando & Orange Cnty. Expwy., 5.95%, 7/01/23 ......................   7/01 at 102     1,019,970
AA-         1,000    Orlando Utils. Comn. Wtr. & Elec. Rev., Ser. D, 5.50%, 10/01/20 ....  10/99 at 100     1,002,210
AAA         1,000    Seminole Cnty. Sch. Brd., C.O.P., Ser. A, 6.125%, 7/01/04, MBIA++ ..        N/A        1,104,510
AAA         1,000    Sunrise Florida Util. Sys. Rev., Ser. A, 5.75%, 10/01/06, AMBAC++ ..        N/A        1,089,840
Baa2        1,000    Volusia Cnty. Ed. Fac. Auth. Rev., 6.125%, 10/15/16 ................  10/06 at 102     1,058,470
                                                                                                          -----------
                                                                                                           20,644,134
                                                                                                          -----------
                     PUERTO RICO--24.8%
                     Puerto Rico Elec. Pwr. Auth. Rev.,
BBB+        1,000      SER. T, 6.375%, 7/01/04++ ........................................        N/A        1,123,600
BBB+        1,000      Ser. U, 6.00%, 7/01/14 ...........................................   7/04 at 102     1,078,580
                     Puerto Rico Pub. Bldg. Auth., Gtd. Pub. Ed. & Hlth. Fac., Ser. M,
A           1,000      5.50%, 7/01/21 ................................................... 7/03 at 101.5     1,009,260
A           1,000      5.75%, 7/01/15 ................................................... 7/03 at 101.5     1,031,780
                                                                                                          -----------
                                                                                                            4,243,220
                                                                                                          -----------
                     Total Long-Term Investments (cost $22,859,615) .....................                  24,887,354
                                                                                                          -----------
</TABLE>

                       See Notes to Financial Statements.



                                       5
<PAGE>

<TABLE>
<CAPTION>

- -----------------------------------------------------------------------------------------------------
         PRINCIPAL
          AMOUNT                                                                            VALUE
RATING*   (000)                             DESCRIPTION                                    (Note 1)
- -----------------------------------------------------------------------------------------------------
<S>         <C>      <C>                                                                 <C>
                     SHORT-TERM INVESTMENTS**--1.7%
A-1+        $ 200    Hillsborough Cnty. Ind. Dev. Auth., P.C.R., Tampa Elec. Co.,
                       Gannon, 4.05%, 5/01/98, FRDD ...................................  $   200,000
A-1+          100    Saint Lucie Cnty., P.C.R., 4.20%, 5/01/98, FRDD ..................      100,000
                                                                                         -----------
                     Total Short-Term Investments (cost $300,000) .....................      300,000
                                                                                         -----------
                     TOTAL INVESTMENTS--147.3% (COST $23,159,615) .....................   25,187,354
                     Other assets in excess of liabilities--2.4% ......................      407,914
                     Liquidation value of preferred stock--(49.7)% ....................   (8,500,000)
                                                                                         -----------
                     NET ASSETS APPLICABLE TO COMMON SHAREHOLDERS--100% ...............  $17,095,268
                                                                                         ===========
</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 earlier of the next date on which the
    security  can be  redeemed  at par or the  next  date on  which  the rate of
    interest is adjusted.
  + Option call Provisions:  date (month/year) and prices of the earliest option
    call on redemption.  There may be other call provisions at varying prices at
    later dates.
 ++ This bond is prerefunded. See Glossary for definitions.

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






                      See Notes to Financial Statements.


                                       6
<PAGE>

- ----------------------------------------------------------------
THE BLACKROCK FLORIDA INVESTMENT
QUALITY MUNICIPAL TRUST
STATEMENT OF ASSETS AND LIABILITIES
APRIL 30, 1998 (UNAUDITED)
- ----------------------------------------------------------------

ASSETS

Investments, at value (cost $23,159,615) (Note 1)   $ 25,187,354
Cash ............................................         90,878
Interest receivable .............................        369,506
                                                    ------------
                                                      25,647,738
                                                    ------------

LIABILITIES

Advisory fee payable (Note 2) ...................          7,433
Dividends payable-preferred stock ...............          6,113
Administration fee payable (Note 2) .............          2,124
Other accrued expenses ..........................         36,800
                                                    ------------
                                                          52,470
                                                    ------------

NET INVESTMENT ASSETS ...........................   $ 25,595,268
                                                    ============

Net investment assets were comprised of:
  Common stock:

    Par value (Note 4) ..........................   $     11,271
    Paid-in capital in excess of par ............     15,585,445

  Preferred stock (Note 4) ......................      8,500,000
                                                    ------------
                                                      24,096,716

  Undistributed net investment income ...........        168,572
  Accumulated net realized loss .................       (697,759)
  Net unrealized appreciation ...................      2,027,739
                                                    ------------
  Net investment assets, April 30, 1998 .........   $ 25,595,268
                                                    ============
  Net assets applicable to common shareholders ..   $ 17,095,268
                                                    ============

Net asset value per share:
  ($17,095,268 / 1,127,093 shares of
  common stock issued and outstanding) ..........         $15.17
                                                          ======

- ------------------------------------------------------------------
THE BLACKROCK FLORIDA INVESTMENT
QUALITY MUNICIPAL TRUST
STATEMENT OF OPERATIONS
SIX MONTHS ENDED APRIL 30, 1998 (UNAUDITED)
- ------------------------------------------------------------------

NET INVESTMENT INCOME

Income
  Interest and discount earned .....................      $702,164
                                                          --------

Expenses
  Investment advisory ..............................        44,328
  Administration ...................................        12,665
  Auction agent ....................................        10,500
  Shareholder reports ..............................         7,000
  Directors ........................................         7,000
  Audit ............................................         5,000
  Transfer agent ...................................         4,000
  Legal ............................................         3,500
  Custodian ........................................         1,000
  Miscellaneous ....................................        10,901
                                                          --------
  Total expenses ...................................       105,894
                                                          --------
Net investment income ..............................       596,270
                                                          --------

UNREALIZED GAIN
ON INVESTMENTS (NOTE 3)

Net change in unrealized appreciation
  on investments ...................................      313,093
                                                         --------

NET INCREASE IN NET INVESTMENT
ASSETS RESULTING FROM OPERATIONS ...................     $909,363
                                                         ========

                      See Notes to Financial Statements.

                                       7
<PAGE>

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

<TABLE>
<CAPTION>
                                                                            SIX MONTHS            YEAR
                                                                               ENDED              ENDED
                                                                             APRIL 30,         OCTOBER 31,
                                                                               1998               1997
                                                                               -----              -----
<S>                                                                         <C>             <C>
INCREASE (DECREASE) IN NET INVESTMENT ASSETS
Operations:

   Net investment income .................................................   $    596,270    $  1,200,029
   Net realized gain on investments ......................................             --          39,699
   Net change in unrealized appreciation on investments ..................        313,093         677,912
                                                                             ------------    ------------
   Net increase in net investment assets resulting from operations .......        909,363       1,917,640

Dividends and distributions:
   To common shareholders from net investment income .....................       (405,714)       (806,563)
   To preferred shareholders from net investment income ..................       (153,455)       (310,486)
   To common shareholders in excess of net realized gain on investments ..             --          (4,875)
   To preferred shareholders in excess of net realized gain on investments             --          (1,819)
                                                                             ------------    ------------
   Total dividends and distributions .....................................       (559,169)     (1,123,743)
                                                                             ------------    ------------
     Total increase ......................................................        350,194         793,897

NET INVESTMENT ASSETS

Beginning of period ......................................................     25,245,074      24,451,177
                                                                             ------------    ------------
End of period ............................................................   $ 25,595,268    $ 25,245,074
                                                                             ============    ============
</TABLE>


                      See Notes to Financial Statements.


                                       8
<PAGE>

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

<TABLE>
<CAPTION>
                                                                                                            FOR THE PERIOD
                                               SIX MONTHS          FOR THE YEAR ENDED OCTOBER 31,             JUNE 4, 1993*
                                                  ENDED    ---------------------------------------------        THROUGH
PER SHARE OPERATING PERFORMANCE:             APRIL 30,1998    1997        1996         1995      1994       OCTOBER 31, 1993
                                             -------------    -----       -----        -----     -----      ----------------
<S>                                             <C>         <C>         <C>          <C>        <C>            <C>
Net asset value, beginning of period .......     $ 14.86    $  14.15    $  14.01     $  11.69    $ 14.77       $  14.10
                                                --------    --------    --------     --------    -------       --------
  Net investment income ....................         .53        1.06        1.03         1.05        .98            .31
  Net realized and unrealized gain (loss) 
          on investments ...................         .28         .65         .13         2.36      (3.02)           .86
                                                --------    --------    --------     --------    -------       --------
  Net increase (decrease) from investment
      operations ...........................         .81        1.71        1.16         3.41      (2.04)          1.17
                                                --------    --------    --------     --------    -------       --------
Dividends and distributions:
Dividends from net investment income to:
    Common shareholders ....................        (.36)       (.72)       (.73)        (.79)      (.79)          (.20)
    Preferred shareholders .................        (.14)       (.28)       (.28)        (.30)      (.20)          (.05)
Distributions from capital gains to:
    Common shareholders ....................          --          --          --           --       (.04)            --
    Preferred shareholders .................          --          --          --           --       (.01)            --
Distributions in excess of net realized gain
 on investments to:
    Common shareholders ....................          --         ***        (.01)          --         --             --
    Preferred shareholders .................          --         ***       ***             --         --             --
                                                --------    --------    --------      -------   --------       --------
    Total dividends and distributions ......        (.50)      (1.00)      (1.02)       (1.09)     (1.04)          (.25)
                                                --------    --------    --------      -------   --------       --------
Capital charge with respect to issuance of
 common and preferred stock ................          --          --          --           --         --           (.25)
                                                --------    --------    --------     --------   --------       --------
Net asset value, end of period** ...........    $  15.17    $  14.86    $  14.15     $  14.01   $  11.69       $  14.77#
                                                ========    ========    ========     ========   ========       ========
Per share market value, end of period** ....    $ 13.875    $13.3125    $  12.25     $ 12.625   $ 10.375       $  14.00
                                                ========    ========    ========     ========   ========       ========
TOTAL INVESTMENT RETURN+: ..................       6.96%      14.95%       2.92%       29.29%    (20.98%)          .63%
RATIOS TO AVERAGE NET ASSETS OF COMMON
      SHAREHOLDERS++:

Expenses ...................................       1.25%+++    1.26%       1.46%        1.44%      1.50%          1.12%+++
Net investment income before preferred stock 
  dividends ................................       7.01%+++    7.43%       7.41%        7.96%      7.34%          5.40%+++
Preferred stock dividends ..................       1.80%+++    1.92%       1.97%        2.28%      1.48%          0.80%+++
Net investment income available to common 
  shareholders .............................       5.21%+++    5.51%       5.44%        5.68%      5.86%          4.60%+++
SUPPLEMENTAL DATA:
Average net assets of common shareholders 
  (in thousands) ...........................    $ 17,149     $16,150    $ 15,699     $ 14,759   $ 15,015       $ 15,791
Portfolio turnover rate ....................          0%          5%         73%         112%       206%            13%
Net assets of common shareholders, end of 
 period in thousands) ......................    $ 17,095     $16,745    $ 15,951     $ 15,788   $ 13,174       $ 16,644

Asset coverage per share of preferred stock,
  end of period## ..........................    $ 75,298     $74,253    $ 71,915     $ 71,437   $127,494       $147,907
Preferred stock outstanding (in thousands) .    $  8,500     $ 8,500    $  8,500     $  8,500   $  8,500       $  8,500
</TABLE>

- -----------
   * Commencement of investment operations.
  ** Net asset value and market value are  published in The Wall Street  Journal
     each Monday.
 *** Actual  amount paid to common  shareholders  for the year ended October 31,
     1997 was  $0.004325,  and the actual amount paid to preferred  shareholders
     was  $0.000185   per  common   share.   Actual  amount  paid  to  preferred
     shareholders  for the year ended  October  31,  1996 was $0.0030 per common
     share.
   # Net asset value  immediately after the closing of the first public offering
     was $14.01.
  ## 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  value on the first  day and a sale at the  current
     market  price  on the  last  day of each  period  reported.  Dividends  and
     distributions are assumed for purposes of this calculation to be reinvested
     at prices  obtained  under the Trust's  dividend  reinvestment  plan.  This
     calculation  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,  expenses and preferred stock
     dividends  applicable to both the common and preferred  shares  relative to
     the average net assets of common shareholders.
 +++ Annualized.

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


                       See Notes to Financial Statements.

                                       9
<PAGE>


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

NOTE 1. ACCOUNTING                                The BlackRock  Florida Invest-
POLICIES                                          ment  Quality  Municipal Trust
(the  "Trust")  was  organized  in   Massachusetts   on  April  15,  1993  as  a
non-diversified closed-end management investment company. The Trust's investment
objective is to provide high current  income exempt from regular  federal income
tax  and  Florida   intangible   personal   property  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 the
state, 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 the 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  discounts  or amortizes
premium on securities purchased using the interest method.

FEDERAL INCOME TAXES: For federal income tax purposes, the Trust is treated as a
separate taxpaying entity. It is the intent of the Trust to continue to meet the
requirements  of the Internal  Revenue Code  applicable to regulated  investment
companies  and to  distribute  all of its 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.

DEFERRED  ORGANIZATION  EXPENSES:  A total of $16,000 was incurred in connection
with the organization of the Trust. These costs have been deferred and are being
amortized  ratably  over a period  of  sixty  months  from  the  date the  Trust
commenced investment operations.

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 Prudential
Investments Fund Management LLC ("PIFM"), an indirect,  wholly-owned  subsidiary
of The Prudential Insurance Company of America.

   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 PIFM is also computed weekly and payable monthly
at an annual rate of 0.10% 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.  PIFM pays occupancy and certain clerical
and accounting costs of the Trust. The Trust bears all other costs and expenses.

                                       10

<PAGE>


NOTE 3. PORTFOLIO                                  Sales of investment  securit-
SECURITIES                                         ies  other  than   short-term
                                                   investments,  for  the    six
months ended April 30, 1998 aggregated $40,000.  There were no purchases for the
same period.

   The federal income tax basis of the Trust's investments at April 30, 1998 was
substantially the same as for financial reporting purposes and, accordingly, net
and gross unrealized appreciation was $2,027,739.

   For federal income tax purposes, the Trust had a capital loss carryforward at
October  31,  1997  of  approximately   $698,000  which  will  expire  in  2002.
Accordingly, no capital gain distribution is expected to be paid to shareholders
until net gains have been realized in excess of such amount.

NOTE 4. CAPITAL                                      There   are   200   million
                                                     shares  of $.01  par  value
common stock authorized.  Of the 1,127,093 shares outstanding at April 30, 1998,
the Adviser  owned 7,093  shares.  As of April 30, 1998 there were 340 shares at
Preferred Stock Series R7 outstanding.

     The Trust may classify or  reclassify  any unissued  shares of common stock
into  one or more  series  of  preferred  stock.  On July  29,  1993  the  Trust
reclassified  170 shares of common  stock and issued a series of Auction  Market
Preferred  Stock  ("Preferred  Stock")  Series  R7.  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  Rate  Municipal  Preferred  Stock  into two shares and
simultaneously  reduce  each  share's  liquidation  preference  from  $50,000 to
$25,000. The stock split occurred on July 24, 1995.

   Dividends on Series R7 are  cumulative  at a rate which is reset every 7 days
based on the results of an auction.  Dividend  rates  ranged from 3.40% to 4.20%
during the six months ended April 30, 1998.

   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 restriction

NOTE 5. DIVIDENDS                                    Subsequent   to  April  30,
                                                     1998,    the    Board    of
Directors of the Trust declared dividends from undistributed earnings of $0.0600
per common share payable May 29, 1998 to shareholders of record on May 15, 1998.

     For the period May 1, 1998  through  May 31,  1998  dividends  declared  on
Preferred  Stock  totalled  $26,402 in aggregate for the  outstanding  Preferred
Stock.

                                       11

<PAGE>

- --------------------------------------------------------------------------------
            THE BLACKROCK FLORIDA INVESTMENT QUALITY MUNICIPAL TRUST
                           DIVIDEND REINVESTMENT PLAN
- --------------------------------------------------------------------------------

      Pursuant  to  the  Trust's  Dividend   Reinvestment   Plan  (the  "Plan"),
shareholders will  automatically 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  unless an election is made to receive  such
amounts in cash.  The Plan Agent will affect  purchases of shares under the Plan
in the open market.  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 in connection with 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,  state or local income taxes that
may be payable on such dividends or distributions.

      Experience  under  the Plan  may  indicate  that  changes  are  desirable.
Accordingly,  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 by the Plan
Agent upon at least 90 days' written  notice to all  shareholders  of the Trust.
The Plan may be  terminated by the Plan Agent or the Trust upon at least 30 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 addresses
are on the front of this report.

- --------------------------------------------------------------------------------
                             ADDITIONAL INFORMATION
- --------------------------------------------------------------------------------

      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 6, 1998 to vote on
     the following matters:
     (1) To elect two Directors as follows:
         DIRECTOR                                 CLASS       TERM      EXPIRING
         -------                                  -----       -----     --------
         James Grosfeld ........................    I        3 years        2000
         James Clayburn La Force, Jr ...........    I        3 years        2000
         Directors whose term of office continues beyond this meeting are Andrew
         F.Brimmer,  Kent Dixon, Laurence D. Fink, Walter F. Mondale, Richard E.
         Cavanagh, Frank J. Fabozzi, and Ralph L. Schlosstein.

     (2) To ratify the selection of Deloitte & Touche LLP as independent  public
         accountants  of the Trust for the fiscal year ending  October 31, 1998.
         Shareholders  elected the two  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>
         James Grosfeld ........................    913,135              0              8,598
         James Clayburn La Force, Jr. ..........    914,535              0              7,198
         Ratification of Deloitte & Touche LLP .    908,821            5,113            7,800
</TABLE>

                                       12

<PAGE>

- --------------------------------------------------------------------------------
            THE BLACKROCK FLORIDA INVESTMENT QUALITY MUNICIPAL TRUST
                               INVESTMENT SUMMARY
- --------------------------------------------------------------------------------

THE TRUST'S INVESTMENT OBJECTIVE

The BlackRock Florida Investment Quality Municipal Trust's investment  objective
is to provide high current income exempt from regular  Federal income tax and to
provide an exemption from Florida intangible  personal property taxes 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 $118
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 $23 billion  family of open-end  equity and bond funds.
Current  institutional  clients  number 334,  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 and "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.  The Trust  intends  to  invest  substantially  all of the  assets in a
portfolio of investment grade Florida Municipal Obligations,  which include debt
obligations issued by the State of Florida, its political subdivisions, agencies
and  instrumentalities  and by other qualifying issuers that pay interest which,
in the opinion of the bond counsel of the issuer,  is exempt from federal income
tax. Florida Municipal Obligations are issued to obtain funds for various public
functions,  including the construction of public facilities,  the refinancing of
outstanding  obligations,  the obtaining of funds for general operating expenses
and for loans to other public institutions and facilities.

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 investment grade Florida Municipal Obligations.  The Adviser actively manages
the assets in relation to market conditions and interest rate changes. 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).  The Trust  intends  to  emphasize
investments  in Florida  Municipal  Obligations  with  long-term  maturities and
expects to  maintain  an average  portfolio  maturity  of 15-20  years,  but the
average  maturity may be shortened or lengthened  from time to time depending on
market conditions.

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.  See "Leverage  Considerations in the Trust"
below.

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

The Trust's  shares are traded on the American  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


                                       13
<PAGE>

reinvested in additional  shares of the fund through the Trust's transfer agent,
State  Street  Bank and Trust  Company.  Investors  who wish to hold shares in a
brokerage account should check with their financial advisor to determine whether
their brokerage firm offers dividend reinvestment services.

LEVERAGE CONSIDERATIONS IN THE TRUST

Leverage  increases  the duration (or price  sensitivity  of the net assets with
respect to changes  in  interest  rates) of the  Trust,  which can  improve  the
performance  of the fund 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.

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 and to  provide  an
exemption from Florida  intangible  personal  property taxes 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 American Stock  Exchange  (AMEX symbol:  RFA) 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.


                                       14
<PAGE>

- --------------------------------------------------------------------------------
            THE BLACKROCK FLORIDA INVESTMENT QUALITY MUNICIPAL TRUST
                                    GLOSSARY
- --------------------------------------------------------------------------------

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

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

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

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

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

NET ASSET VALUE (NAV):           Net asset  value is the total  market  value of
                                 all  securities  and other  assets  held by the
                                 Trust,  plus income accrued on its investments,
                                 minus   any   liabilities   including   accrued
                                 expenses,   divided  by  the  total  number  of
                                 outstanding  shares. It is the underlying value
                                 of a single  share on a given  day.  Net  asset
                                 value for the Trust is  calculated  weekly  and
                                 published  in BARRON'S on Saturday  and THE NEW
                                 YORK  TIMES or THE  WALL  STREET  JOURNAL  each
                                 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.
 
                                       15

<PAGE>

[LOGO]

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
Prudential Investments Fund Management LLC
Gateway Center Three
100 Mulberry Street
Newark, N.J. 07102-4077

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, 1998 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 FLORIDA INVESTMENT
                             QUALITY MUNICIPAL TRUST
                 c/o Prudential Investments Fund Management LLC
                              Gateway Center Three
                               100 Mulberry Street
                             Newark, N.J. 07102-4077
                                 (800) 227-7BFM

[RECYCLE LOGO] Printed on recycled paper                             09247B-10-9



THE BLACKROCK
FLORIDA
INVESTMENT QUALITY
MUNICIPAL TRUST
==============================
SEMI-ANNUAL REPORT
APRIL 30, 1998



[GRAPHIC]




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