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<SEC-DOCUMENT>0000905148-06-007592.txt : 20061229
<SEC-HEADER>0000905148-06-007592.hdr.sgml : 20061229
<ACCEPTANCE-DATETIME>20061229110019
ACCESSION NUMBER:		0000905148-06-007592
CONFORMED SUBMISSION TYPE:	NT-NCSR
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20061031
FILED AS OF DATE:		20061229
DATE AS OF CHANGE:		20061229
EFFECTIVENESS DATE:		20061229

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			BLACKROCK MUNIVEST FUND II INC
		CENTRAL INDEX KEY:			0000897269
		IRS NUMBER:				223220659
		STATE OF INCORPORATION:			MD
		FISCAL YEAR END:			1031

	FILING VALUES:
		FORM TYPE:		NT-NCSR
		SEC ACT:		1940 Act
		SEC FILE NUMBER:	811-07478
		FILM NUMBER:		061304351

	BUSINESS ADDRESS:	
		STREET 1:		800 SCUDDERS MILL ROAD
		CITY:			PLAINSBORO
		STATE:			NJ
		ZIP:			08536
		BUSINESS PHONE:		6092822800

	MAIL ADDRESS:	
		STREET 1:		800 SCUDDERS MILL ROAD
		CITY:			PLAINSBORO
		STATE:			NJ
		ZIP:			08536

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MUNIVEST FUND II INC
		DATE OF NAME CHANGE:	19930714
</SEC-HEADER>
<DOCUMENT>
<TYPE>NT-NCSR
<SEQUENCE>1
<FILENAME>efc6-3066_60006891fmntcsr.txt
<TEXT>
                                 UNITED STATES
                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549

                                  FORM 12b-25



                                                 Commission File Number 811-7478

                                                        CUSIP Number 09253R 10 5

                          NOTIFICATION OF LATE FILING

(Check One):
[   ] Form 10-K                             [   ] Form 20-F
[   ] Form 11-K                             [   ] Form 10-Q
[   ] Form N-SAR                            [ X ] Form N-CSR

     For Period Ended: October 31, 2006


     [ ]    Transition Report on Form 10-K
     [ ]    Transition Report on Form 20-F
     [ ]    Transition Report on Form 11-K
     [ ]    Transition Report on Form 10-Q
     [ ]    Transition Report on Form N-SAR
     [ ]    Transition Report on Form N-CSR

     For the Transition Period Ended:____________________________


      Read Attached Instruction Sheet Before Preparing Form. Please Print or
Type.

      Nothing in this form shall be construed to imply that the Commission has
verified any information contained herein.


      If the notification relates to a portion of the filing checked above,
identify the Item(s) to which the notification
relates:________________________



<PAGE>



                                    PART I
                            REGISTRANT INFORMATION


BlackRock MuniVest Fund II, Inc.
- ----------------------------------------------------------------------------
Full Name of Registrant


MuniVest Fund II, Inc.
- ----------------------------------------------------------------------------
Former Name if Applicable


800 Scudders Mill Road
- ----------------------------------------------------------------------------
Address of Principal Executive Office (Street and Number)


Plainsboro, New Jersey  08536
- ----------------------------------------------------------------------------
City, State and Zip Code


                                    PART II
                            RULE 12b-25(b) AND (c)


      If the subject report could not be filed without unreasonable effort or
expense and the registrant seeks relief pursuant to Rule 12b-25(b), the
following should be completed. (Check box if appropriate) X -

           (a) The reasons described in reasonable detail in Part III of this
form could not be eliminated without unreasonable effort or expense;


           (b) The subject annual report, semi-annual report, transition report
on Form 10-K, Form 20-F, 11-K, Form N-SAR or Form N-CSR, or portion thereof will
be filed on or before the 15th calendar day following the prescribed due date;
or the subject quarterly report or transition report on Form 10-Q, or portion
thereof will be filed on or before the fifth calendar day following the
prescribed due date; and


           (c) The accountant's statement or other exhibit required by Rule
12b-25(c) has been attached if applicable.



                                      2

<PAGE>

                                   PART III
                                   NARRATIVE


      State below in reasonable detail the reasons why Forms 10-K, 20-F, 11-K,
10-Q, N-SAR, N-CSR or the transition report or portion thereof could not be
filed within the prescribed time period. (Attach extra sheets if needed.)

      Due to a recent change in the accounting interpretation of the
presentation in the Fund's financial statements of investments in tender
option bonds or inverse floating rate bonds, the Fund is not able to finalize
the presentation of these investments in its financial statements for a timely
filing of its Form N-CSR to be made. Additionally, as a result of the
foregoing, Deloitte & Touche LLP, the Fund's independent registered public
accounting firm, is not able to finalize their audit of the financial
statements of the Fund for a timely filing of the Form N-CSR to be made. The
Fund's Form N-CSR will be completed and filed with the Securities and Exchange
Commission as soon as practicable.


                                    PART IV
                               OTHER INFORMATION


      (1) Name and telephone number of person to contact in regard to this
notification.

Donald C. Burke                                              (609) 282-7085
- ------------------------------------------------------------------------------
(Name)                          (Area code)                 (Telephone number)

      (2) Have all other periodic reports required under Section 13 or 15(d)
of the Securities Exchange Act of 1934 or Section 30 of the Investment Company
Act of 1940 during the preceding 12 months or for such shorter period that the
registrant was required to file such report(s) been filed? If answer is no,
identify report(s).


                  _X_ Yes                   ___ No

         (3) Is it anticipated that any significant change in results of
operations from the corresponding period for the last fiscal year will be
reflected by the earnings statements to be included in the subject report or
portion thereof?


                  ___ Yes                   _X_ No

         If so, attach an explanation of the anticipated change, both
narratively and quantitatively, and, if appropriate, state the reasons why a
reasonable estimate of the results cannot be made.


                                      3


<PAGE>






Date     December 28, 2006                   By   /s/ Donald C. Burke
         ----------------------------             -----------------------------
                                                  Donald C. Burke
                                                  Vice President and Treasurer



                                      4
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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