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

    <schemaVersion>X0708</schemaVersion>

    <submissionType>D</submissionType>

    <testOrLive>LIVE</testOrLive>

    <primaryIssuer>
        <cik>0002102821</cik>
        <entityName>BREG Key St, LLC</entityName>
        <issuerAddress>
            <street1>176 MINE LAKE CT</street1>
            <street2>SUITE 100</street2>
            <city>RALEIGH</city>
            <stateOrCountry>NC</stateOrCountry>
            <stateOrCountryDescription>NORTH CAROLINA</stateOrCountryDescription>
            <zipCode>27615</zipCode>
        </issuerAddress>
        <issuerPhoneNumber>781-570-9194</issuerPhoneNumber>
        <jurisdictionOfInc>NORTH CAROLINA</jurisdictionOfInc>
        <issuerPreviousNameList>
            <value>None</value>
        </issuerPreviousNameList>
        <edgarPreviousNameList>
            <value>None</value>
        </edgarPreviousNameList>
        <entityType>Limited Liability Company</entityType>
        <yearOfInc>
            <withinFiveYears>true</withinFiveYears>
            <value>2025</value>
        </yearOfInc>
    </primaryIssuer>

    <relatedPersonsList>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Andrew</firstName>
                <lastName>Bonomo</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o BREG Key St LLC</street1>
                <street2>176 Mine Lake Ct, Ste 100</street2>
                <city>Raleigh</city>
                <stateOrCountry>NC</stateOrCountry>
                <stateOrCountryDescription>NORTH CAROLINA</stateOrCountryDescription>
                <zipCode>27615</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Manager of BREG Key St manager, LLC, the manager of the issuer</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Jake</firstName>
                <lastName>Beaton</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o BREG Key St LLC</street1>
                <street2>176 Mine Lake Ct, Ste 100</street2>
                <city>Raleigh</city>
                <stateOrCountry>NC</stateOrCountry>
                <stateOrCountryDescription>NORTH CAROLINA</stateOrCountryDescription>
                <zipCode>27615</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Manager of BREG Key St manager, LLC, the manager of the issuer</relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>William</firstName>
                <lastName>Correa</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o BREG Key St LLC</street1>
                <street2>176 Mine Lake Ct, Ste 100</street2>
                <city>Raleigh</city>
                <stateOrCountry>NC</stateOrCountry>
                <stateOrCountryDescription>NORTH CAROLINA</stateOrCountryDescription>
                <zipCode>27615</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Manager of BREG Key St manager, LLC, the manager of the issuer</relationshipClarification>
        </relatedPersonInfo>
    </relatedPersonsList>

    <offeringData>
        <industryGroup>
            <industryGroupType>Commercial</industryGroupType>
        </industryGroup>
        <issuerSize>
            <revenueRange>Decline to Disclose</revenueRange>
        </issuerSize>
        <federalExemptionsExclusions>
            <item>06b</item>
        </federalExemptionsExclusions>
        <typeOfFiling>
            <newOrAmendment>
                <isAmendment>false</isAmendment>
            </newOrAmendment>
            <dateOfFirstSale>
                <value>2025-12-17</value>
            </dateOfFirstSale>
        </typeOfFiling>
        <durationOfOffering>
            <moreThanOneYear>false</moreThanOneYear>
        </durationOfOffering>
        <typesOfSecuritiesOffered>
            <isEquityType>true</isEquityType>
        </typesOfSecuritiesOffered>
        <businessCombinationTransaction>
            <isBusinessCombinationTransaction>false</isBusinessCombinationTransaction>
            <clarificationOfResponse></clarificationOfResponse>
        </businessCombinationTransaction>
        <minimumInvestmentAccepted>10000</minimumInvestmentAccepted>
        <salesCompensationList></salesCompensationList>
        <offeringSalesAmounts>
            <totalOfferingAmount>1715000</totalOfferingAmount>
            <totalAmountSold>1715000</totalAmountSold>
            <totalRemaining>0</totalRemaining>
            <clarificationOfResponse></clarificationOfResponse>
        </offeringSalesAmounts>
        <investors>
            <hasNonAccreditedInvestors>true</hasNonAccreditedInvestors>
            <numberNonAccreditedInvestors>13</numberNonAccreditedInvestors>
            <totalNumberAlreadyInvested>39</totalNumberAlreadyInvested>
        </investors>
        <salesCommissionsFindersFees>
            <salesCommissions>
                <dollarAmount>0</dollarAmount>
            </salesCommissions>
            <findersFees>
                <dollarAmount>0</dollarAmount>
            </findersFees>
            <clarificationOfResponse></clarificationOfResponse>
        </salesCommissionsFindersFees>
        <useOfProceeds>
            <grossProceedsUsed>
                <dollarAmount>64500</dollarAmount>
            </grossProceedsUsed>
            <clarificationOfResponse>This amount represents the acquisition fee and financing fee earned directly or indirectly by an affiliate of the Manager of the Issuer (a portion of which may ultimately be distributed to certain of the persons named in Item 3).</clarificationOfResponse>
        </useOfProceeds>
        <signatureBlock>
            <authorizedRepresentative>false</authorizedRepresentative>
            <signature>
                <issuerName>BREG Key St, LLC</issuerName>
                <signatureName>/s/ Jake Beaton</signatureName>
                <nameOfSigner>Jake Beaton</nameOfSigner>
                <signatureTitle>Manager of Issuer's Manager</signatureTitle>
                <signatureDate>2026-01-05</signatureDate>
            </signature>
        </signatureBlock>
    </offeringData>
</edgarSubmission>
