<?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>0000102382</rptOwnerCik>
            <rptOwnerName>URSTADT CHARLES J</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>2 PARK PLACE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BRONXVILLE</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10708</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chairman of the Board and CEO</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001267830</rptOwnerCik>
            <rptOwnerName>URSTADT PROPERTY CO INC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>2 PARK PLACE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BRONXVILLE</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10708</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <officerTitle></officerTitle>
            <otherText>Joint Filer</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <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="F1"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>100000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>20.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>4079109</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnote</value>
                    <footnoteId id="F3"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">On February 3, 2012, Urstadt Property Company, Inc., a Delaware corporation of which Mr. Urstadt is Chairman and a controlling shareholder (&quot;UPCO&quot;), purchased 100,000 shares of Common Stock at a price of $20.00 per share.</footnote>
        <footnote id="F2">This figure includes 531,250 restricted shares of Common Stock issued pursuant to the Issuer's Amended and Restated Restricted Stock Award Plan, all of which are held by Urstadt Realty Shares II L.P., a Delaware limited partnership of which UPCO is the general partner and Mr. Urstadt is the limited partner (&quot;URS II&quot;), as reported on previously filed Forms 4 and 5.</footnote>
        <footnote id="F3">Mr. Urstadt is the direct beneficial owner of 10,050 shares of Common Stock of the Issuer. He is the indirect beneficial owner of 4,069,059 shares of Common Stock, of which 1,204,338 shares are held by URS II (including the 531,250 restricted shares referenced in Footnote 2), 877,011 shares are held by UPCO, 41,050 shares are held by Elinor Urstadt, Mr. Urstadt's wife, 4,229 shares are held by the trust established under the Urstadt Biddle Properties Inc. Excess Benefit and Deferred Compensation Plan of 2005 for the benefit of Mr. Urstadt and 1,942,431 shares are held by Urstadt Realty Associates Co LP, a Delaware limited partnership, of which UPCO is the general partner and Mr. Urstadt, Mrs. Urstadt, the Catherine U. Biddle Irrevocable Trust and the Charles D. Urstadt Irrevocable Trust (for each of which trusts Mr. Urstadt is the sole trustee) are the limited partners.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Charles J. Urstadt by Thomas D. Myers as Attorney-in-Fact</signatureName>
        <signatureDate>2012-02-06</signatureDate>
    </ownerSignature>
</ownershipDocument>
