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

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2008-08-29</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001332349</issuerCik>
        <issuerName>Brookdale Senior Living Inc.</issuerName>
        <issuerTradingSymbol>BKD</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001380393</rptOwnerCik>
            <rptOwnerName>Fortress Investment Group LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>1345 AVENUE OF THE AMERICAS, 46TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10105</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001245521</rptOwnerCik>
            <rptOwnerName>FIG LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>1345 AVENUE OF THE AMERICAS, 46TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10105</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001387345</rptOwnerCik>
            <rptOwnerName>FIG Corp.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>1345 AVENUE OF THE AMERICAS, 46TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10105</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001387344</rptOwnerCik>
            <rptOwnerName>Fortress Operating Entity I LP</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>1345 AVENUE OF THE AMERICAS, 46TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10105</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2008-08-29</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
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                </transactionShares>
                <transactionPricePerShare>
                    <value>22.205</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>60300</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>Drawbridge Global Macro Master Fund Ltd.</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
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            </transactionTimeliness>
            <transactionAmounts>
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                </transactionShares>
                <transactionPricePerShare>
                    <value>22.2025</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
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                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
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                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
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                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
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            </ownershipNature>
        </nonDerivativeTransaction>
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            <transactionTimeliness>
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            </transactionTimeliness>
            <transactionAmounts>
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                </transactionShares>
                <transactionPricePerShare>
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                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
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                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>58800</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
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                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
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            <transactionDate>
                <value>2008-08-29</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
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                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
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                </transactionShares>
                <transactionPricePerShare>
                    <value>22.1975</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
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                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>57500</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>Drawbridge Global Macro Master Fund Ltd.</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2008-08-29</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
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                <transactionFormType>4</transactionFormType>
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            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
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                </transactionShares>
                <transactionPricePerShare>
                    <value>22.195</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
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            <postTransactionAmounts>
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            <ownershipNature>
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                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
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        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
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            <transactionDate>
                <value>2008-08-29</value>
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            <transactionTimeliness>
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            <transactionAmounts>
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                </transactionShares>
                <transactionPricePerShare>
                    <value>22.1925</value>
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                <transactionAcquiredDisposedCode>
                    <value>D</value>
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            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>52000</value>
                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
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                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
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        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
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            <transactionDate>
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            <transactionCoding>
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            <transactionTimeliness>
                <value></value>
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                <transactionPricePerShare>
                    <value>22.19</value>
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                <transactionAcquiredDisposedCode>
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            <ownershipNature>
                <directOrIndirectOwnership>
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                    <footnoteId id="F3"/>
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                    <footnoteId id="F3"/>
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            <securityTitle>
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            <securityTitle>
                <value>Common Stock</value>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
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                    <value>RIC Coinvestment Fund LP</value>
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                    <value>I</value>
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                    <value>Drawbridge Special Opportunities Fund Ltd.</value>
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                    <value>FRIT Holdings LLC</value>
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    <footnotes>
        <footnote id="F1">For the avoidance of doubt, please note that Wesley Edens did not divest any of his personal holdings in Brookdale Senior Living Inc., nor did he direct the investment decision which led to the sale of shares reported herein. Mr. Edens may, however, be deemed to beneficially own the shares listed in this report as beneficially owned by Fortress Investment Group LLC (&quot;FIG&quot;) or its affiliates. Mr. Edens disclaims beneficial ownership of all reported shares except to the extent of his pecuniary interest therein and the inclusion of the shares in this report shall not be deemed to be an admission of beneficial ownership of all of the reported shares for purposes of Section 16 of the Securities Exchange Act of 1934, as amended (&quot;Section 16&quot;), or otherwise. (continued in Footnote 2)</footnote>
        <footnote id="F2">(continued from Footnote 1) Similarly, each reporting person disclaims beneficial ownership of all reported shares except to the extent of its pecuniary interest therein and the inclusion of the shares in this report shall not be deemed an admission of beneficial ownership of the reported shares for the purposes of Section 16 or otherwise.</footnote>
        <footnote id="F3">Drawbridge Global Macro Master Fund Ltd. (&quot;Global Macro Master&quot;) is wholly-owned by Drawbridge Global Macro Intermediate Fund LP (&quot;Global Macro Intermediate&quot;) and Drawbridge Global Macro Fund LP (&quot;Global Macro LP&quot;). Drawbridge Global Macro Advisors LLC (&quot;Global Macro Advisors&quot;) is the investment advisor of each of Global Macro Intermediate, Global Macro LP and Global Macro Master. FIG LLC is the sole managing member of Global Macro Advisors. Fortress Operating Entity I LP (&quot;FOE I&quot;) is the sole managing member of FIG LLC. FIG Corp. is the general partner of FOE I, and FIG Corp. is wholly-owned by FIG.</footnote>
        <footnote id="F4">FIG Advisors LLC is the investment advisor of RIC Coinvestment Fund LP and Fortress Brookdale Investment Fund LLC. RIC Coinvestment Fund GP LLC (&quot;RIC GP&quot;) is the general partner of RIC Coinvestment Fund LP. FIG Advisors LLC is a wholly-owned subsidiary of FIG LLC. FOE I is the sole managing member of FIG LLC. Fortress Operating Entity II LP (&quot;FOE II&quot;) is the managing member of RIC GP. FIG Corp. is the general partner of each of FOE I and FOE II, and FIG Corp. is wholly-owned by FIG.</footnote>
        <footnote id="F5">Drawbridge Special Opportunities Advisors LLC is the investment manager of Drawbridge Special Opportunities Fund Ltd. FIG LLC is the sole managing member of Drawbridge Special Opportunities Advisors LLC. FOE I is the sole managing member of FIG LLC. FIG Corp. is the general partner of FOE I, and FIG Corp. is wholly-owned by FIG.</footnote>
        <footnote id="F6">Drawbridge Special Opportunities Advisors LLC is the investment manager of Drawbridge Special Opportunities Fund LP. FIG LLC is the sole managing member of Drawbridge Special Opportunities Advisors LLC. FOE I is the sole managing member of FIG LLC. FIG Corp. is the general partner of FOE I, and FIG Corp. is wholly-owned by FIG.</footnote>
        <footnote id="F7">FIT Brookdale Holdings LLC is wholly-owned by FIT-ALT Investor LLC. FIT-ALT Investor LLC is a wholly-owned subsidiary of FIT Holdings LLC, which is a wholly-owned subsidiary of Fortress Investment Trust II, which is a majority-owned subsidiary of Fortress Investment Fund II LLC. Fortress Fund MM II LLC is the managing member of Fortress Investment Fund II LLC. FIG LLC is the sole managing member of Fortress Fund MM II LLC. FOE I is the sole managing member of FIG LLC. FIG Corp. is the general partner of FOE I, and FIG Corp. is wholly-owned by FIG.</footnote>
        <footnote id="F8">FRIT Holdings LLC is a wholly-owned subsidiary of Fortress Registered Investment Trust, which is wholly-owned by Fortress Investment Fund LLC.  Fortress Fund MM LLC is the managing member of Fortress Investment Fund LLC. FIG LLC is the sole managing member of Fortress Fund MM LLC. FOE I is the sole managing member of FIG LLC. FIG Corp. is the general partner of FOE I, and FIG Corp. is wholly-owned by FIG.</footnote>
    </footnotes>

    <remarks>This is the second of two Form 4's filed by the reporting persons on the same date.</remarks>

    <ownerSignature>
        <signatureName>/s/ David Brooks, as Authorized Signatory of Fortress Investment Group LLC.</signatureName>
        <signatureDate>2008-09-03</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ David Brooks, as Authorized Signatory of FIG LLC</signatureName>
        <signatureDate>2008-09-03</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ David Brooks, as Authorized Signatory of FIG Corp.</signatureName>
        <signatureDate>2008-09-03</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ David Brooks, as Authorized Signatory of Fortress Operating Entity I LP</signatureName>
        <signatureDate>2008-09-03</signatureDate>
    </ownerSignature>
</ownershipDocument>
