UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A INFORMATION

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

Filed by the Registrant  x                            Filed by a Party other than the Registrant  ¨

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¨ Preliminary Proxy Statement

¨ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

¨ Definitive Proxy Statement

x Definitive Additional Materials

¨ Soliciting Material Pursuant to §240.14a-12

BlackRock New Jersey Investment Quality Municipal Trust, Inc.

BlackRock New York Investment Quality Municipal Trust, Inc.

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if Other than the Registrant)

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IMPORTANT NOTICE:

BLACKROCK NEW JERSEY INVESTMENT QUALITY MUNICIPAL TRUST, INC. (“RNJ”)

BLACKROCK NEW YORK INVESTMENT QUALITY MUNICIPAL TRUST, INC. (“RNY”)

— SHAREHOLDER MEETING ADJOURNED TO JUNE 28, 2012 —

Dear Shareholder:

We previously mailed you proxy materials relating to proposals to be voted on at a joint Special Shareholder Meeting of RNJ and RNY to be held on Thursday, May 31, 2012 at 9:00 a.m. ET. To permit additional time to solicit shareholder votes for the proposals found in the Joint Proxy, the Special Meeting has been adjourned until Thursday, June 28, 2012 at 9:00 a.m. ET and is scheduled to reconvene at that time on the 4th floor of 1 University Square Drive, Princeton, NJ 08540-6455. This letter was sent because records indicate you held shares in one or more of the funds on the record date which have not yet been voted.

YOUR VOTE IS VERY IMPORTANT

VOTING NOW HELPS AVOID UNNECESSARY SOLICITATION WITH

SHAREHOLDERS AND ELIMINATES FUTURE PHONE CALLS

For the reasons set forth in the proxy materials previously mailed to you, the Board of Directors unanimously recommend that you vote “For” the approval of the proposals.

You can cast your vote by using one of the following options:

1. Vote Online - by logging onto the website listed on the enclosed voting instructions form;

2. Vote by Touch -Tone Phone - by calling the toll free number on the voting instructions form and following the instructions; or

3. Vote By Mail - by completing and returning your executed voting instructions form in the postage paid envelope provided.

Remember, your vote is very important and counts. Please exercise your shareholder rights and vote today.

If you have any questions about the proposals, please call Georgeson Inc., each fund’s proxy solicitor, toll free at 1-866-856-2826.

If you have already voted, please disregard this notice.

Thank you for voting!