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

    <schemaVersion>X0304</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2012-02-03</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>2012-01-20</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>43</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>16.6241</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>2288245</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>2012-02-03</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F2"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>100000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>20.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>2388245</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">Those shares of Common Stock of which Mr. Biddle is the indirect beneficial owner and which are owned by two Trusts Established Under the Urstadt Biddle Properties Inc. Excess Benefit and Deferred Compensation Plans of 2000 and 2005 (the &quot;Compensation Plan Trusts&quot;) are subject to automatic reinvestment of dividends pursuant to the Issuer's Dividend Reinvestment Plan. On January 20, 2012, dividends on these shares were paid and automatically reinvested in additional Common Stock for the benefit of Mr. Biddle in the amount of 43.3833 shares.</footnote>
        <footnote id="F2">On February 3, 2012, Mr. Biddle purchased 100,000 shares of Common Stock at a price of $20.00 per share.</footnote>
        <footnote id="F3">This figure includes 937,500 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 2,352,245 shares of Common Stock, including the 937,500 restricted shares noted in Footnote 3. In addition, he is the indirect beneficial owner of 36,000 shares of Common Stock, of which 3,248 shares are owned by the Compensation Plan Trusts, 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</signatureName>
        <signatureDate>2012-02-06</signatureDate>
    </ownerSignature>
</ownershipDocument>
