BlackRock Muni Intermediate Duration Fund, Inc. Announces Pricing and Placement of Approximately $287 Million in Private

  BlackRock Muni Intermediate Duration Fund, Inc. Announces Pricing and
  Placement of Approximately $287 Million in Private Offering of Variable Rate
  Muni Term Preferred Shares

Business Wire

NEW YORK -- December 07, 2012

BlackRock Advisors, LLC today announced that BlackRock Muni Intermediate
Duration Fund, Inc. (NYSE:MUI, the “Fund”) successfully priced and placed
Variable Rate Muni Term Preferred Shares (“VMTP”) pursuant to an offering
exempt from registration under the Securities Act of 1933.

Totaling approximately $287 million in aggregate, the proceeds from the VMTP
issuance will be used to redeem all of the Fund’s outstanding Variable Rate
Demand Preferred Shares (“VRDP”), which is expected to occur on or about
December 21, 2012.

In connection with this issuance, BlackRock will post regular portfolio
information for the Fund on its public website at www.blackrock.com. This
information includes fund holdings (which will be available monthly after a
15-day lag) and asset coverage and leverage ratios (which will be available
weekly).

This press release is neither an offer to sell nor a solicitation of an offer
to buy any of these securities.

About BlackRock

BlackRock is a leader in investment management, risk management and advisory
services for institutional and retail clients worldwide. At September 30,
2012, BlackRock’s AUM was $3.673 trillion. BlackRock offers products that span
the risk spectrum to meet clients’ needs, including active, enhanced and index
strategies across markets and asset classes. Products are offered in a variety
of structures including separate accounts, mutual funds, iShares^®  (exchange
traded funds), and other pooled investment vehicles. BlackRock also offers
risk management, advisory and enterprise investment system services to a broad
base of institutional investors through BlackRock Solutions^®. Headquartered
in New York City, as of September 30, 2012, the firm has approximately 10,400
employees in 29 countries and a major presence in key global markets,
including North and South America, Europe, Asia, Australia and the Middle East
and Africa. For additional information, please visit BlackRock’s website at
www.blackrock.com.

Forward-Looking Statements

This press release, and other statements that BlackRock or the Fund may make,
may contain forward-looking statements within the meaning of the Private
Securities Litigation Reform Act, with respect to the Fund or BlackRock’s
future financial or business performance, strategies or expectations.
Forward-looking statements are typically identified by words or phrases such
as “trend,” “potential,” “opportunity,” “pipeline,” “believe,” “comfortable,”
“expect,” “anticipate,” “current,” “intention,” “estimate,” “position,”
“assume,” “outlook,” “continue,” “remain,” “maintain,” “sustain,” “seek,”
“achieve,” and similar expressions, or future or conditional verbs such as
“will,” “would,” “should,” “could,” “may” or similar expressions.

BlackRock cautions that forward-looking statements are subject to numerous
assumptions, risks and uncertainties, which change over time. Forward-looking
statements speak only as of the date they are made, and BlackRock assumes no
duty to and does not undertake to update forward-looking statements. Actual
results could differ materially from those anticipated in forward-looking
statements and future results could differ materially from historical
performance.

With respect to the Fund, the following factors, among others, could cause
actual events to differ materially from forward-looking statements or
historical performance: (1) changes and volatility in political, economic or
industry conditions, the interest rate environment, foreign exchange rates or
financial and capital markets, which could result in changes in demand for the
Fund or in the Fund’s net asset value; (2) the relative and absolute
investment performance of the Fund and its investments; (3) the impact of
increased competition; (4) the unfavorable resolution of any legal
proceedings; (5) the extent and timing of any distributions or share
repurchases; (6) the impact, extent and timing of technological changes; (7)
the impact of legislative and regulatory actions and reforms, including the
Dodd-Frank Wall Street Reform and Consumer Protection Act, and regulatory,
supervisory or enforcement actions of government agencies relating to the Fund
or BlackRock, as applicable; (8) terrorist activities, international
hostilities and natural disasters, which may adversely affect the general
economy, domestic and local financial and capital markets, specific industries
or BlackRock; (9) BlackRock’s ability to attract and retain highly talented
professionals; (10) the impact of BlackRock electing to provide support to its
products from time to time; and (11) the impact of problems at other financial
institutions or the failure or negative performance of products at other
financial institutions.

Annual and Semi-Annual Reports and other regulatory filings of the Fund with
the Securities and Exchange Commission (“SEC”) are accessible on the SEC's
website at www.sec.gov  and on BlackRock’s website at www.blackrock.com, and
may discuss these or other factors that affect the Fund. The information
contained on BlackRock’s website is not a part of this press release.

Contact:

BlackRock Muni Intermediate Duration Fund, Inc.
1-800-882-0052
 
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