<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2011-06-27</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001029800</issuerCik>
        <issuerName>URSTADT BIDDLE PROPERTIES INC</issuerName>
        <issuerTradingSymbol>UBP</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001070094</rptOwnerCik>
            <rptOwnerName>BIDDLE WILLING L</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>53 ELMWOOD ROAD</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>SOUTH SALEM</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10590</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>President and COO</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2011-06-27</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>1</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>115610</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>2177781</value>
                    <footnoteId id="F3"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnote</value>
                    <footnoteId id="F4"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2011-06-27</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>1</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>1706</value>
                    <footnoteId id="F2"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>2179487</value>
                    <footnoteId id="F3"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnote</value>
                    <footnoteId id="F4"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">On June 27, 2011, Willing L. Biddle completed an equity swap (the &quot;WLB Equity Swap&quot;) of 115,610 shares of Class A Common Stock of the Issuer for 115,610 shares of Common Stock of the Issuer with third parties unrelated to the Issuer by acquiring 115,610 shares of Common Stock pursuant to the WLB Equity Swap.</footnote>
        <footnote id="F2">On June 27, 2011, Catherine U. Biddle, the Reporting Person's wife, completed an equity swap (the &quot;CUB Equity Swap&quot;) of 1,706 shares of Class A Common Stock of the Issuer for 1,706 shares of Common Stock of the Issuer with third parties unrelated to the Issuer by acquiring 1,706 shares of Common Stock pursuant to the CUB Equity Swap.</footnote>
        <footnote id="F3">This figure includes 837,500 restricted shares of Common Stock issued pursuant to the Issuer's Amended and Restated Restricted Stock Award Plan.</footnote>
        <footnote id="F4">Mr. Biddle is the direct beneficial owner of 2,142,455 shares of Common Stock, including the 837,500 restricted shares noted in Footnote 3. In addition, he is the indirect beneficial owner of 37,032 shares of Common Stock, of which 4,280 shares are owned by two Trusts Established Under the Urstadt Biddle Properties Inc. Excess Benefit and Deferred Compensation Plans of 2000 and 2005, 2,307 shares are owned by the Willing L. Biddle IRA for the benefit of Mr. Biddle, 5,163 shares are owned by the P.T. Biddle (Deceased) IRA for the benefit of Willing Biddle, 23,657 shares are owned beneficially and of record by Catherine U. Biddle, Mr. Biddle's wife, 555 shares are owned by the Catherine U. Biddle IRA for the benefit of Catherine U. Biddle, and 1,070 shares are owned by the Charles and Phoebe Biddle Trust UAD 12/20/93 for the benefit of the Issue of Willing L. Biddle (the &quot;Biddle Trust&quot;). Mr. Biddle and Charles J. Urstadt are the sole trustees of the Biddle Trust.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Willing L. Biddle by Thomas D. Myers as Attorney-in-Fact</signatureName>
        <signatureDate>2011-06-29</signatureDate>
    </ownerSignature>
</ownershipDocument>
