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    <link:label id="lab_snh_JointVentureMember_9F5BC8A93CB67A0ED38E93AC1509261A_label_en-US" xlink:label="lab_snh_JointVentureMember_9F5BC8A93CB67A0ED38E93AC1509261A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Joint Venture [Member]</link:label>
    <link:label id="lab_snh_JointVentureMember_9F5BC8A93CB67A0ED38E93AC1509261A_documentation_en-US" xlink:label="lab_snh_JointVentureMember_9F5BC8A93CB67A0ED38E93AC1509261A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Joint Venture [Member]</link:label>
    <link:loc xlink:href="snh-20190331.xsd#snh_JointVentureMember" xlink:label="loc_snh_JointVentureMember_9F5BC8A93CB67A0ED38E93AC1509261A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_snh_JointVentureMember_9F5BC8A93CB67A0ED38E93AC1509261A" xlink:to="lab_snh_JointVentureMember_9F5BC8A93CB67A0ED38E93AC1509261A" xlink:type="arc" />
    <link:label id="lab_us-gaap_DisposalGroupClassificationAxis_6A4AE5E4167187AFDBCF93AC150A2FEF_terseLabel_en-US" xlink:label="lab_us-gaap_DisposalGroupClassificationAxis_6A4AE5E4167187AFDBCF93AC150A2FEF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disposal Group Classification [Axis]</link:label>
    <link:label id="lab_us-gaap_DisposalGroupClassificationAxis_6A4AE5E4167187AFDBCF93AC150A2FEF_label_en-US" xlink:label="lab_us-gaap_DisposalGroupClassificationAxis_6A4AE5E4167187AFDBCF93AC150A2FEF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disposal Group Classification [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DisposalGroupClassificationAxis" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_6A4AE5E4167187AFDBCF93AC150A2FEF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_6A4AE5E4167187AFDBCF93AC150A2FEF" xlink:to="lab_us-gaap_DisposalGroupClassificationAxis_6A4AE5E4167187AFDBCF93AC150A2FEF" xlink:type="arc" />
    <link:label id="lab_us-gaap_DisposalGroupClassificationDomain_216F26C24FD29781EFD893AC150A2B12_terseLabel_en-US" xlink:label="lab_us-gaap_DisposalGroupClassificationDomain_216F26C24FD29781EFD893AC150A2B12" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disposal Group Classification [Domain]</link:label>
    <link:label id="lab_us-gaap_DisposalGroupClassificationDomain_216F26C24FD29781EFD893AC150A2B12_label_en-US" xlink:label="lab_us-gaap_DisposalGroupClassificationDomain_216F26C24FD29781EFD893AC150A2B12" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disposal Group Classification [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DisposalGroupClassificationDomain" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_216F26C24FD29781EFD893AC150A2B12" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_216F26C24FD29781EFD893AC150A2B12" xlink:to="lab_us-gaap_DisposalGroupClassificationDomain_216F26C24FD29781EFD893AC150A2B12" xlink:type="arc" />
    <link:label id="lab_us-gaap_DiscontinuedOperationsHeldforsaleMember_5E43549ADFF7EAD35BA293AC150B2BA4_terseLabel_en-US" xlink:label="lab_us-gaap_DiscontinuedOperationsHeldforsaleMember_5E43549ADFF7EAD35BA293AC150B2BA4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Discontinued Operations, Held-for-sale</link:label>
    <link:label id="lab_us-gaap_DiscontinuedOperationsHeldforsaleMember_5E43549ADFF7EAD35BA293AC150B2BA4_label_en-US" xlink:label="lab_us-gaap_DiscontinuedOperationsHeldforsaleMember_5E43549ADFF7EAD35BA293AC150B2BA4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Discontinued Operations, Held-for-sale [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DiscontinuedOperationsHeldforsaleMember" xlink:label="loc_us-gaap_DiscontinuedOperationsHeldforsaleMember_5E43549ADFF7EAD35BA293AC150B2BA4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DiscontinuedOperationsHeldforsaleMember_5E43549ADFF7EAD35BA293AC150B2BA4" xlink:to="lab_us-gaap_DiscontinuedOperationsHeldforsaleMember_5E43549ADFF7EAD35BA293AC150B2BA4" xlink:type="arc" />
    <link:label id="lab_us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember_3F7FB817027D51A1EAAC93AC150A9614_terseLabel_en-US" xlink:label="lab_us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember_3F7FB817027D51A1EAAC93AC150A9614" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Disposal Group, Disposed of by Sale, Not Discontinued Operations</link:label>
    <link:label id="lab_us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember_3F7FB817027D51A1EAAC93AC150A9614_label_en-US" xlink:label="lab_us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember_3F7FB817027D51A1EAAC93AC150A9614" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember" xlink:label="loc_us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember_3F7FB817027D51A1EAAC93AC150A9614" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember_3F7FB817027D51A1EAAC93AC150A9614" xlink:to="lab_us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember_3F7FB817027D51A1EAAC93AC150A9614" xlink:type="arc" />
    <link:label id="lab_srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis_DD5BCC91511B6CF858C993AC150B2A02_terseLabel_en-US" xlink:label="lab_srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis_DD5BCC91511B6CF858C993AC150B2A02" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Real Estate, Type of Property [Axis]</link:label>
    <link:label id="lab_srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis_DD5BCC91511B6CF858C993AC150B2A02_label_en-US" xlink:label="lab_srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis_DD5BCC91511B6CF858C993AC150B2A02" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Real Estate, Type of Property [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis" xlink:label="loc_srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis_DD5BCC91511B6CF858C993AC150B2A02" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis_DD5BCC91511B6CF858C993AC150B2A02" xlink:to="lab_srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis_DD5BCC91511B6CF858C993AC150B2A02" xlink:type="arc" />
    <link:label id="lab_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_71D30424280BB5E477D293AC150B117B_terseLabel_en-US" xlink:label="lab_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_71D30424280BB5E477D293AC150B117B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Real Estate [Domain]</link:label>
    <link:label id="lab_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_71D30424280BB5E477D293AC150B117B_label_en-US" xlink:label="lab_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_71D30424280BB5E477D293AC150B117B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Real Estate [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_MortgageLoansOnRealEstateNamePropertyTypeDomain" xlink:label="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_71D30424280BB5E477D293AC150B117B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_71D30424280BB5E477D293AC150B117B" xlink:to="lab_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_71D30424280BB5E477D293AC150B117B" xlink:type="arc" />
    <link:label id="lab_snh_MedicalOfficeBuildingMember_A7E84799E6874B1612B793AC150B066A_terseLabel_en-US" xlink:label="lab_snh_MedicalOfficeBuildingMember_A7E84799E6874B1612B793AC150B066A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">MOBs</link:label>
    <link:label id="lab_snh_MedicalOfficeBuildingMember_A7E84799E6874B1612B793AC150B066A_label_en-US" xlink:label="lab_snh_MedicalOfficeBuildingMember_A7E84799E6874B1612B793AC150B066A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Medical Office Building [Member]</link:label>
    <link:label id="lab_snh_MedicalOfficeBuildingMember_A7E84799E6874B1612B793AC150B066A_documentation_en-US" xlink:label="lab_snh_MedicalOfficeBuildingMember_A7E84799E6874B1612B793AC150B066A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the information pertaining to medical office buildings. The MOBs are office or commercial buildings constructed for use or operated as medical office space for physicians and other health personnel, and other businesses in medical related fields, including clinics and laboratory uses.</link:label>
    <link:loc xlink:href="snh-20190331.xsd#snh_MedicalOfficeBuildingMember" xlink:label="loc_snh_MedicalOfficeBuildingMember_A7E84799E6874B1612B793AC150B066A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_snh_MedicalOfficeBuildingMember_A7E84799E6874B1612B793AC150B066A" xlink:to="lab_snh_MedicalOfficeBuildingMember_A7E84799E6874B1612B793AC150B066A" xlink:type="arc" />
    <link:label id="lab_snh_SkilledNursingFacilityMember_D5D5987EF6551F32D7B193AC150C7A9B_terseLabel_en-US" xlink:label="lab_snh_SkilledNursingFacilityMember_D5D5987EF6551F32D7B193AC150C7A9B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Skilled Nursing Facility</link:label>
    <link:label id="lab_snh_SkilledNursingFacilityMember_D5D5987EF6551F32D7B193AC150C7A9B_label_en-US" xlink:label="lab_snh_SkilledNursingFacilityMember_D5D5987EF6551F32D7B193AC150C7A9B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Skilled Nursing Facility [Member]</link:label>
    <link:label id="lab_snh_SkilledNursingFacilityMember_D5D5987EF6551F32D7B193AC150C7A9B_documentation_en-US" xlink:label="lab_snh_SkilledNursingFacilityMember_D5D5987EF6551F32D7B193AC150C7A9B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the information pertaining to skilled nursing facility properties. Nursing homes generally provide extensive nursing and healthcare services similar to those available in hospitals, without the high costs associated with operating theatres, emergency rooms or intensive care units.</link:label>
    <link:loc xlink:href="snh-20190331.xsd#snh_SkilledNursingFacilityMember" xlink:label="loc_snh_SkilledNursingFacilityMember_D5D5987EF6551F32D7B193AC150C7A9B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_snh_SkilledNursingFacilityMember_D5D5987EF6551F32D7B193AC150C7A9B" xlink:to="lab_snh_SkilledNursingFacilityMember_D5D5987EF6551F32D7B193AC150C7A9B" xlink:type="arc" />
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentLineItems_1458BA090112FF11B7A893AC150C58BE_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentLineItems_1458BA090112FF11B7A893AC150C58BE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Real Estate Properties</link:label>
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentLineItems_1458BA090112FF11B7A893AC150C58BE_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentLineItems_1458BA090112FF11B7A893AC150C58BE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_1458BA090112FF11B7A893AC150C58BE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_1458BA090112FF11B7A893AC150C58BE" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentLineItems_1458BA090112FF11B7A893AC150C58BE" xlink:type="arc" />
    <link:label id="lab_us-gaap_NumberOfRealEstateProperties_E1594B99C29AACE9351293AC150CC9EC_verboseLabel_en-US" xlink:label="lab_us-gaap_NumberOfRealEstateProperties_E1594B99C29AACE9351293AC150CC9EC" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Number of real estate properties</link:label>
    <link:label id="lab_us-gaap_NumberOfRealEstateProperties_E1594B99C29AACE9351293AC150CC9EC_label_en-US" xlink:label="lab_us-gaap_NumberOfRealEstateProperties_E1594B99C29AACE9351293AC150CC9EC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number of Real Estate Properties</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NumberOfRealEstateProperties" xlink:label="loc_us-gaap_NumberOfRealEstateProperties_E1594B99C29AACE9351293AC150CC9EC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NumberOfRealEstateProperties_E1594B99C29AACE9351293AC150CC9EC" xlink:to="lab_us-gaap_NumberOfRealEstateProperties_E1594B99C29AACE9351293AC150CC9EC" xlink:type="arc" />
    <link:label id="lab_snh_NumberOfRealEstatePropertiesHeldForSale_9FD10A1593FB91ECB5BA93AC150C63F7_terseLabel_en-US" xlink:label="lab_snh_NumberOfRealEstatePropertiesHeldForSale_9FD10A1593FB91ECB5BA93AC150C63F7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of real estate properties held for sale</link:label>
    <link:label id="lab_snh_NumberOfRealEstatePropertiesHeldForSale_9FD10A1593FB91ECB5BA93AC150C63F7_label_en-US" xlink:label="lab_snh_NumberOfRealEstatePropertiesHeldForSale_9FD10A1593FB91ECB5BA93AC150C63F7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number of Real Estate Properties Held For Sale</link:label>
    <link:label id="lab_snh_NumberOfRealEstatePropertiesHeldForSale_9FD10A1593FB91ECB5BA93AC150C63F7_documentation_en-US" xlink:label="lab_snh_NumberOfRealEstatePropertiesHeldForSale_9FD10A1593FB91ECB5BA93AC150C63F7" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The number of real estate properties owned by the entity, which are classified as held for sale as of the balance sheet date.</link:label>
    <link:loc xlink:href="snh-20190331.xsd#snh_NumberOfRealEstatePropertiesHeldForSale" xlink:label="loc_snh_NumberOfRealEstatePropertiesHeldForSale_9FD10A1593FB91ECB5BA93AC150C63F7" xlink:type="locator" />
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    <link:label id="lab_snh_NumberOfBuildings_421E29E4C3847070B40A93AC150C668F_verboseLabel_en-US" xlink:label="lab_snh_NumberOfBuildings_421E29E4C3847070B40A93AC150C668F" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Number of buildings</link:label>
    <link:label id="lab_snh_NumberOfBuildings_421E29E4C3847070B40A93AC150C668F_label_en-US" xlink:label="lab_snh_NumberOfBuildings_421E29E4C3847070B40A93AC150C668F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number of Buildings</link:label>
    <link:label id="lab_snh_NumberOfBuildings_421E29E4C3847070B40A93AC150C668F_documentation_en-US" xlink:label="lab_snh_NumberOfBuildings_421E29E4C3847070B40A93AC150C668F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The number of buildings owned as of the balance sheet date.</link:label>
    <link:loc xlink:href="snh-20190331.xsd#snh_NumberOfBuildings" xlink:label="loc_snh_NumberOfBuildings_421E29E4C3847070B40A93AC150C668F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_snh_NumberOfBuildings_421E29E4C3847070B40A93AC150C668F" xlink:to="lab_snh_NumberOfBuildings_421E29E4C3847070B40A93AC150C668F" xlink:type="arc" />
    <link:label id="lab_us-gaap_NumberOfStatesInWhichEntityOperates_4BBA7195079B9FB75E2B93AC150DE928_terseLabel_en-US" xlink:label="lab_us-gaap_NumberOfStatesInWhichEntityOperates_4BBA7195079B9FB75E2B93AC150DE928" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of states in which properties are located</link:label>
    <link:label id="lab_us-gaap_NumberOfStatesInWhichEntityOperates_4BBA7195079B9FB75E2B93AC150DE928_label_en-US" xlink:label="lab_us-gaap_NumberOfStatesInWhichEntityOperates_4BBA7195079B9FB75E2B93AC150DE928" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number of States in which Entity Operates</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NumberOfStatesInWhichEntityOperates" xlink:label="loc_us-gaap_NumberOfStatesInWhichEntityOperates_4BBA7195079B9FB75E2B93AC150DE928" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NumberOfStatesInWhichEntityOperates_4BBA7195079B9FB75E2B93AC150DE928" xlink:to="lab_us-gaap_NumberOfStatesInWhichEntityOperates_4BBA7195079B9FB75E2B93AC150DE928" xlink:type="arc" />
    <link:label id="lab_us-gaap_EquityMethodInvestmentOwnershipPercentage_26BF8F3B8FE544CB769193AC150DFB9B_terseLabel_en-US" xlink:label="lab_us-gaap_EquityMethodInvestmentOwnershipPercentage_26BF8F3B8FE544CB769193AC150DFB9B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Ownership percentage</link:label>
    <link:label id="lab_us-gaap_EquityMethodInvestmentOwnershipPercentage_26BF8F3B8FE544CB769193AC150DFB9B_label_en-US" xlink:label="lab_us-gaap_EquityMethodInvestmentOwnershipPercentage_26BF8F3B8FE544CB769193AC150DFB9B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Equity Method Investment, Ownership Percentage</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage" xlink:label="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_26BF8F3B8FE544CB769193AC150DFB9B" xlink:type="locator" />
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    <link:label id="lab_us-gaap_AssetImpairmentCharges_8BA99C07EF8AC7BBC3A493AC150DB9D1_terseLabel_en-US" xlink:label="lab_us-gaap_AssetImpairmentCharges_8BA99C07EF8AC7BBC3A493AC150DB9D1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Impairment of assets</link:label>
    <link:label id="lab_us-gaap_AssetImpairmentCharges_8BA99C07EF8AC7BBC3A493AC150DB9D1_label_en-US" xlink:label="lab_us-gaap_AssetImpairmentCharges_8BA99C07EF8AC7BBC3A493AC150DB9D1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Asset Impairment Charges</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AssetImpairmentCharges" xlink:label="loc_us-gaap_AssetImpairmentCharges_8BA99C07EF8AC7BBC3A493AC150DB9D1" xlink:type="locator" />
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    <link:label id="lab_snh_NumberOfPropertiesAcquired_3EB5BB6205E07246CA0693AC150DF978_terseLabel_en-US" xlink:label="lab_snh_NumberOfPropertiesAcquired_3EB5BB6205E07246CA0693AC150DF978" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of properties acquired</link:label>
    <link:label id="lab_snh_NumberOfPropertiesAcquired_3EB5BB6205E07246CA0693AC150DF978_label_en-US" xlink:label="lab_snh_NumberOfPropertiesAcquired_3EB5BB6205E07246CA0693AC150DF978" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number Of Properties Acquired</link:label>
    <link:label id="lab_snh_NumberOfPropertiesAcquired_3EB5BB6205E07246CA0693AC150DF978_documentation_en-US" xlink:label="lab_snh_NumberOfPropertiesAcquired_3EB5BB6205E07246CA0693AC150DF978" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the number of properties acquired or agreed to be acquired by the entity.</link:label>
    <link:loc xlink:href="snh-20190331.xsd#snh_NumberOfPropertiesAcquired" xlink:label="loc_snh_NumberOfPropertiesAcquired_3EB5BB6205E07246CA0693AC150DF978" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_snh_NumberOfPropertiesAcquired_3EB5BB6205E07246CA0693AC150DF978" xlink:to="lab_snh_NumberOfPropertiesAcquired_3EB5BB6205E07246CA0693AC150DF978" xlink:type="arc" />
    <link:label id="lab_snh_NumberOfCommunitiesSold_26018CA498BF46DE8ECB93AC150DABAB_terseLabel_en-US" xlink:label="lab_snh_NumberOfCommunitiesSold_26018CA498BF46DE8ECB93AC150DABAB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of communities sold</link:label>
    <link:label id="lab_snh_NumberOfCommunitiesSold_26018CA498BF46DE8ECB93AC150DABAB_label_en-US" xlink:label="lab_snh_NumberOfCommunitiesSold_26018CA498BF46DE8ECB93AC150DABAB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number of Communities Sold</link:label>
    <link:label id="lab_snh_NumberOfCommunitiesSold_26018CA498BF46DE8ECB93AC150DABAB_documentation_en-US" xlink:label="lab_snh_NumberOfCommunitiesSold_26018CA498BF46DE8ECB93AC150DABAB" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the number of communities sold.</link:label>
    <link:loc xlink:href="snh-20190331.xsd#snh_NumberOfCommunitiesSold" xlink:label="loc_snh_NumberOfCommunitiesSold_26018CA498BF46DE8ECB93AC150DABAB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_snh_NumberOfCommunitiesSold_26018CA498BF46DE8ECB93AC150DABAB" xlink:to="lab_snh_NumberOfCommunitiesSold_26018CA498BF46DE8ECB93AC150DABAB" xlink:type="arc" />
    <link:label id="lab_snh_SquareFootageOfRealEstatePropertyLeased_103A044A114E0C3455E193AC150D8BD2_terseLabel_en-US" xlink:label="lab_snh_SquareFootageOfRealEstatePropertyLeased_103A044A114E0C3455E193AC150D8BD2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Square footage of real estate property</link:label>
    <link:label id="lab_snh_SquareFootageOfRealEstatePropertyLeased_103A044A114E0C3455E193AC150D8BD2_label_en-US" xlink:label="lab_snh_SquareFootageOfRealEstatePropertyLeased_103A044A114E0C3455E193AC150D8BD2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Square Footage of Real Estate Property Leased</link:label>
    <link:label id="lab_snh_SquareFootageOfRealEstatePropertyLeased_103A044A114E0C3455E193AC150D8BD2_documentation_en-US" xlink:label="lab_snh_SquareFootageOfRealEstatePropertyLeased_103A044A114E0C3455E193AC150D8BD2" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the area of the real estate property subject to an operating lease.</link:label>
    <link:loc xlink:href="snh-20190331.xsd#snh_SquareFootageOfRealEstatePropertyLeased" xlink:label="loc_snh_SquareFootageOfRealEstatePropertyLeased_103A044A114E0C3455E193AC150D8BD2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_snh_SquareFootageOfRealEstatePropertyLeased_103A044A114E0C3455E193AC150D8BD2" xlink:to="lab_snh_SquareFootageOfRealEstatePropertyLeased_103A044A114E0C3455E193AC150D8BD2" xlink:type="arc" />
    <link:label id="lab_snh_RealEstateAggregateSalesPrice_252CE591DDF85E92546993AC150D0024_verboseLabel_en-US" xlink:label="lab_snh_RealEstateAggregateSalesPrice_252CE591DDF85E92546993AC150D0024" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Aggregate purchase price</link:label>
    <link:label id="lab_snh_RealEstateAggregateSalesPrice_252CE591DDF85E92546993AC150D0024_label_en-US" xlink:label="lab_snh_RealEstateAggregateSalesPrice_252CE591DDF85E92546993AC150D0024" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Real Estate Aggregate Sales Price</link:label>
    <link:label id="lab_snh_RealEstateAggregateSalesPrice_252CE591DDF85E92546993AC150D0024_documentation_en-US" xlink:label="lab_snh_RealEstateAggregateSalesPrice_252CE591DDF85E92546993AC150D0024" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This element represents the aggregate sales price excluding closing costs, of real estate properties sold by the entity.</link:label>
    <link:loc xlink:href="snh-20190331.xsd#snh_RealEstateAggregateSalesPrice" xlink:label="loc_snh_RealEstateAggregateSalesPrice_252CE591DDF85E92546993AC150D0024" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DisposalGroupIncludingDiscontinuedOperationRentalIncome_3C2228727D249944C60793B7DAF6588D_terseLabel_en-US" xlink:label="lab_us-gaap_DisposalGroupIncludingDiscontinuedOperationRentalIncome_3C2228727D249944C60793B7DAF6588D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Rental income</link:label>
    <link:label id="lab_us-gaap_DisposalGroupIncludingDiscontinuedOperationRentalIncome_3C2228727D249944C60793B7DAF6588D_label_en-US" xlink:label="lab_us-gaap_DisposalGroupIncludingDiscontinuedOperationRentalIncome_3C2228727D249944C60793B7DAF6588D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disposal Group, Including Discontinued Operation, Rental Income</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationRentalIncome" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationRentalIncome_3C2228727D249944C60793B7DAF6588D" xlink:type="locator" />
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    <link:label id="lab_us-gaap_RealEstateHeldforsale_A873A60D6FCBEE6A7EDC93AC150E123B_terseLabel_en-US" xlink:label="lab_us-gaap_RealEstateHeldforsale_A873A60D6FCBEE6A7EDC93AC150E123B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Amount under agreement to sell</link:label>
    <link:label id="lab_us-gaap_RealEstateHeldforsale_A873A60D6FCBEE6A7EDC93AC150E123B_label_en-US" xlink:label="lab_us-gaap_RealEstateHeldforsale_A873A60D6FCBEE6A7EDC93AC150E123B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Real Estate Held-for-sale</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RealEstateHeldforsale" xlink:label="loc_us-gaap_RealEstateHeldforsale_A873A60D6FCBEE6A7EDC93AC150E123B" xlink:type="locator" />
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    <link:label id="lab_us-gaap_FairValueDisclosuresAbstract_38A6CEAF9AB88D03AF4893AE1C6A1887_label_en-US" xlink:label="lab_us-gaap_FairValueDisclosuresAbstract_38A6CEAF9AB88D03AF4893AE1C6A1887" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value Disclosures [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueDisclosuresAbstract" xlink:label="loc_us-gaap_FairValueDisclosuresAbstract_38A6CEAF9AB88D03AF4893AE1C6A1887" xlink:type="locator" />
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    <link:label id="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_9983514113F0B1F5DCD393AE1C6AB138_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_9983514113F0B1F5DCD393AE1C6AB138" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value Measurements, Recurring and Nonrecurring [Table]</link:label>
    <link:label id="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_9983514113F0B1F5DCD393AE1C6AB138_label_en-US" xlink:label="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_9983514113F0B1F5DCD393AE1C6AB138" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value Measurements, Recurring and Nonrecurring [Table]</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueByMeasurementFrequencyAxis" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_0435A67E63DF2526401693AE1C6E6941" xlink:type="locator" />
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    <link:label id="lab_us-gaap_FairValueMeasurementFrequencyDomain_CF5049EFE298D1CB2D9893AE1C6E7B02_label_en-US" xlink:label="lab_us-gaap_FairValueMeasurementFrequencyDomain_CF5049EFE298D1CB2D9893AE1C6E7B02" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value, Measurement Frequency [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_CF5049EFE298D1CB2D9893AE1C6E7B02" xlink:type="locator" />
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    <link:label id="lab_us-gaap_FairValueMeasurementsNonrecurringMember_520C29D4E753C669D4AD93AE1C6FF420_label_en-US" xlink:label="lab_us-gaap_FairValueMeasurementsNonrecurringMember_520C29D4E753C669D4AD93AE1C6FF420" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value, Measurements, Nonrecurring [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueMeasurementsNonrecurringMember" xlink:label="loc_us-gaap_FairValueMeasurementsNonrecurringMember_520C29D4E753C669D4AD93AE1C6FF420" xlink:type="locator" />
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    <link:label id="lab_us-gaap_FairValueByFairValueHierarchyLevelAxis_23BE62692A482C10572F93AE1C6FD0C0_label_en-US" xlink:label="lab_us-gaap_FairValueByFairValueHierarchyLevelAxis_23BE62692A482C10572F93AE1C6FD0C0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value Hierarchy and NAV [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_23BE62692A482C10572F93AE1C6FD0C0" xlink:type="locator" />
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    <link:label id="lab_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_B165CCFFB01CEE6D99A593AE1C6F0B69_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_B165CCFFB01CEE6D99A593AE1C6F0B69" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value Hierarchy and NAV [Domain]</link:label>
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    <link:label id="lab_snh_SeniorLivingCommunityMember_433CD782E49081194D480D6E76CAD43B_label_en-US" xlink:label="lab_snh_SeniorLivingCommunityMember_433CD782E49081194D480D6E76CAD43B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Senior Living Community [Member]</link:label>
    <link:label id="lab_snh_SeniorLivingCommunityMember_433CD782E49081194D480D6E76CAD43B_documentation_en-US" xlink:label="lab_snh_SeniorLivingCommunityMember_433CD782E49081194D480D6E76CAD43B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the information pertaining to senior living properties. Senior apartments are marketed to residents who are generally capable of caring for themselves. Residence is usually restricted on the basis of age. Purpose built properties may have special function rooms, concierge services, high levels of security and assistance call systems for emergency use.</link:label>
    <link:loc xlink:href="snh-20190331.xsd#snh_SeniorLivingCommunityMember" xlink:label="loc_snh_SeniorLivingCommunityMember_433CD782E49081194D480D6E76CAD43B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_snh_SeniorLivingCommunityMember_433CD782E49081194D480D6E76CAD43B" xlink:to="lab_snh_SeniorLivingCommunityMember_433CD782E49081194D480D6E76CAD43B" xlink:type="arc" />
    <link:label id="lab_snh_ReitManagementAndResearchIncMember_C46EE261DBAF7D0487660D6E76CAAC6C_terseLabel_en-US" xlink:label="lab_snh_ReitManagementAndResearchIncMember_C46EE261DBAF7D0487660D6E76CAAC6C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">RMR Inc</link:label>
    <link:label id="lab_snh_ReitManagementAndResearchIncMember_C46EE261DBAF7D0487660D6E76CAAC6C_label_en-US" xlink:label="lab_snh_ReitManagementAndResearchIncMember_C46EE261DBAF7D0487660D6E76CAAC6C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Reit Management And Research Inc [Member]</link:label>
    <link:label id="lab_snh_ReitManagementAndResearchIncMember_C46EE261DBAF7D0487660D6E76CAAC6C_documentation_en-US" xlink:label="lab_snh_ReitManagementAndResearchIncMember_C46EE261DBAF7D0487660D6E76CAAC6C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the information pertaining to Reit Management &amp; Research Inc. (RMR)</link:label>
    <link:loc xlink:href="snh-20190331.xsd#snh_ReitManagementAndResearchIncMember" xlink:label="loc_snh_ReitManagementAndResearchIncMember_C46EE261DBAF7D0487660D6E76CAAC6C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_snh_ReitManagementAndResearchIncMember_C46EE261DBAF7D0487660D6E76CAAC6C" xlink:to="lab_snh_ReitManagementAndResearchIncMember_C46EE261DBAF7D0487660D6E76CAAC6C" xlink:type="arc" />
    <link:label id="lab_snh_ReitManagementAndResearchLLCMember_014EB272DE71DAF0F56E0D6E76CA7D8D_terseLabel_en-US" xlink:label="lab_snh_ReitManagementAndResearchLLCMember_014EB272DE71DAF0F56E0D6E76CA7D8D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">RMR LLC</link:label>
    <link:label id="lab_snh_ReitManagementAndResearchLLCMember_014EB272DE71DAF0F56E0D6E76CA7D8D_label_en-US" xlink:label="lab_snh_ReitManagementAndResearchLLCMember_014EB272DE71DAF0F56E0D6E76CA7D8D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Reit Management And Research L L C [Member]</link:label>
    <link:label id="lab_snh_ReitManagementAndResearchLLCMember_014EB272DE71DAF0F56E0D6E76CA7D8D_documentation_en-US" xlink:label="lab_snh_ReitManagementAndResearchLLCMember_014EB272DE71DAF0F56E0D6E76CA7D8D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents details pertaining to Reit Management and Research LLC, or RMR.</link:label>
    <link:loc xlink:href="snh-20190331.xsd#snh_ReitManagementAndResearchLLCMember" xlink:label="loc_snh_ReitManagementAndResearchLLCMember_014EB272DE71DAF0F56E0D6E76CA7D8D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_snh_ReitManagementAndResearchLLCMember_014EB272DE71DAF0F56E0D6E76CA7D8D" xlink:to="lab_snh_ReitManagementAndResearchLLCMember_014EB272DE71DAF0F56E0D6E76CA7D8D" xlink:type="arc" />
    <link:label id="lab_us-gaap_RelatedPartyTransactionLineItems_BD7BD8033F86CFB2C3C90D6E76CA950D_terseLabel_en-US" xlink:label="lab_us-gaap_RelatedPartyTransactionLineItems_BD7BD8033F86CFB2C3C90D6E76CA950D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Related person transactions</link:label>
    <link:label id="lab_us-gaap_RelatedPartyTransactionLineItems_BD7BD8033F86CFB2C3C90D6E76CA950D_label_en-US" xlink:label="lab_us-gaap_RelatedPartyTransactionLineItems_BD7BD8033F86CFB2C3C90D6E76CA950D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Related Party Transaction [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RelatedPartyTransactionLineItems" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_BD7BD8033F86CFB2C3C90D6E76CA950D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_BD7BD8033F86CFB2C3C90D6E76CA950D" xlink:to="lab_us-gaap_RelatedPartyTransactionLineItems_BD7BD8033F86CFB2C3C90D6E76CA950D" xlink:type="arc" />
    <link:label id="lab_snh_RelatedPartyEmployeesNumber_484C1EF3D007CBB7B7550D6E76CA004C_terseLabel_en-US" xlink:label="lab_snh_RelatedPartyEmployeesNumber_484C1EF3D007CBB7B7550D6E76CA004C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of employees</link:label>
    <link:label id="lab_snh_RelatedPartyEmployeesNumber_484C1EF3D007CBB7B7550D6E76CA004C_label_en-US" xlink:label="lab_snh_RelatedPartyEmployeesNumber_484C1EF3D007CBB7B7550D6E76CA004C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Related Party Employees Number</link:label>
    <link:label id="lab_snh_RelatedPartyEmployeesNumber_484C1EF3D007CBB7B7550D6E76CA004C_documentation_en-US" xlink:label="lab_snh_RelatedPartyEmployeesNumber_484C1EF3D007CBB7B7550D6E76CA004C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the number of persons employed by a related party of the entity.</link:label>
    <link:loc xlink:href="snh-20190331.xsd#snh_RelatedPartyEmployeesNumber" xlink:label="loc_snh_RelatedPartyEmployeesNumber_484C1EF3D007CBB7B7550D6E76CA004C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_snh_RelatedPartyEmployeesNumber_484C1EF3D007CBB7B7550D6E76CA004C" xlink:to="lab_snh_RelatedPartyEmployeesNumber_484C1EF3D007CBB7B7550D6E76CA004C" xlink:type="arc" />
    <link:label id="lab_snh_RelatedPartyTransactionPropertyManagementAgreementNumberOfConsecutiveRenewalTerms_EC556558E23CF24F20840D6E76CAD3B9_terseLabel_en-US" xlink:label="lab_snh_RelatedPartyTransactionPropertyManagementAgreementNumberOfConsecutiveRenewalTerms_EC556558E23CF24F20840D6E76CAD3B9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of consecutive renewal terms of agreement</link:label>
    <link:label id="lab_snh_RelatedPartyTransactionPropertyManagementAgreementNumberOfConsecutiveRenewalTerms_EC556558E23CF24F20840D6E76CAD3B9_label_en-US" xlink:label="lab_snh_RelatedPartyTransactionPropertyManagementAgreementNumberOfConsecutiveRenewalTerms_EC556558E23CF24F20840D6E76CAD3B9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Related Party Transaction, Property Management Agreement, Number of Consecutive Renewal Terms</link:label>
    <link:label id="lab_snh_RelatedPartyTransactionPropertyManagementAgreementNumberOfConsecutiveRenewalTerms_EC556558E23CF24F20840D6E76CAD3B9_documentation_en-US" xlink:label="lab_snh_RelatedPartyTransactionPropertyManagementAgreementNumberOfConsecutiveRenewalTerms_EC556558E23CF24F20840D6E76CAD3B9" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the number of consecutive renewal terms of agreement that the entity has the option to renew.</link:label>
    <link:loc xlink:href="snh-20190331.xsd#snh_RelatedPartyTransactionPropertyManagementAgreementNumberOfConsecutiveRenewalTerms" xlink:label="loc_snh_RelatedPartyTransactionPropertyManagementAgreementNumberOfConsecutiveRenewalTerms_EC556558E23CF24F20840D6E76CAD3B9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_snh_RelatedPartyTransactionPropertyManagementAgreementNumberOfConsecutiveRenewalTerms_EC556558E23CF24F20840D6E76CAD3B9" xlink:to="lab_snh_RelatedPartyTransactionPropertyManagementAgreementNumberOfConsecutiveRenewalTerms_EC556558E23CF24F20840D6E76CAD3B9" xlink:type="arc" />
    <link:label id="lab_snh_NumberOfCommunitiesManagedByRelatedParty_C5CD28D56A08FA75B8310D6E76CAD31F_terseLabel_en-US" xlink:label="lab_snh_NumberOfCommunitiesManagedByRelatedParty_C5CD28D56A08FA75B8310D6E76CAD31F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of communities managed by related party</link:label>
    <link:label id="lab_snh_NumberOfCommunitiesManagedByRelatedParty_C5CD28D56A08FA75B8310D6E76CAD31F_label_en-US" xlink:label="lab_snh_NumberOfCommunitiesManagedByRelatedParty_C5CD28D56A08FA75B8310D6E76CAD31F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number of Communities Managed by Related Party</link:label>
    <link:label id="lab_snh_NumberOfCommunitiesManagedByRelatedParty_C5CD28D56A08FA75B8310D6E76CAD31F_documentation_en-US" xlink:label="lab_snh_NumberOfCommunitiesManagedByRelatedParty_C5CD28D56A08FA75B8310D6E76CAD31F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the number of communities managed by a related party.</link:label>
    <link:loc xlink:href="snh-20190331.xsd#snh_NumberOfCommunitiesManagedByRelatedParty" xlink:label="loc_snh_NumberOfCommunitiesManagedByRelatedParty_C5CD28D56A08FA75B8310D6E76CAD31F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_snh_NumberOfCommunitiesManagedByRelatedParty_C5CD28D56A08FA75B8310D6E76CAD31F" xlink:to="lab_snh_NumberOfCommunitiesManagedByRelatedParty_C5CD28D56A08FA75B8310D6E76CAD31F" xlink:type="arc" />
    <link:label id="lab_snh_RelatedPartyTransactionBusinessManagementFees_EE1428D2723E5791B9750D6E76CAB984_terseLabel_en-US" xlink:label="lab_snh_RelatedPartyTransactionBusinessManagementFees_EE1428D2723E5791B9750D6E76CAB984" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Business management fees incurred</link:label>
    <link:label id="lab_snh_RelatedPartyTransactionBusinessManagementFees_EE1428D2723E5791B9750D6E76CAB984_label_en-US" xlink:label="lab_snh_RelatedPartyTransactionBusinessManagementFees_EE1428D2723E5791B9750D6E76CAB984" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Related Party Transaction Business Management Fees</link:label>
    <link:label id="lab_snh_RelatedPartyTransactionBusinessManagementFees_EE1428D2723E5791B9750D6E76CAB984_documentation_en-US" xlink:label="lab_snh_RelatedPartyTransactionBusinessManagementFees_EE1428D2723E5791B9750D6E76CAB984" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the business management fees incurred pursuant to business management agreement with related parties.</link:label>
    <link:loc xlink:href="snh-20190331.xsd#snh_RelatedPartyTransactionBusinessManagementFees" xlink:label="loc_snh_RelatedPartyTransactionBusinessManagementFees_EE1428D2723E5791B9750D6E76CAB984" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_snh_RelatedPartyTransactionBusinessManagementFees_EE1428D2723E5791B9750D6E76CAB984" xlink:to="lab_snh_RelatedPartyTransactionBusinessManagementFees_EE1428D2723E5791B9750D6E76CAB984" xlink:type="arc" />
    <link:label id="lab_snh_RelatedPartyTransactionBusinessManagementFeesRelatedtoSubsidiaryLevelManagement_941FF4D2BB0A24578ACD0D6E76CA57EF_terseLabel_en-US" xlink:label="lab_snh_RelatedPartyTransactionBusinessManagementFeesRelatedtoSubsidiaryLevelManagement_941FF4D2BB0A24578ACD0D6E76CA57EF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Related party transaction business management fees related to subsidiary level management</link:label>
    <link:label id="lab_snh_RelatedPartyTransactionBusinessManagementFeesRelatedtoSubsidiaryLevelManagement_941FF4D2BB0A24578ACD0D6E76CA57EF_label_en-US" xlink:label="lab_snh_RelatedPartyTransactionBusinessManagementFeesRelatedtoSubsidiaryLevelManagement_941FF4D2BB0A24578ACD0D6E76CA57EF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Related Party Transaction Business Management Fees Related to Subsidiary Level Management</link:label>
    <link:label id="lab_snh_RelatedPartyTransactionBusinessManagementFeesRelatedtoSubsidiaryLevelManagement_941FF4D2BB0A24578ACD0D6E76CA57EF_documentation_en-US" xlink:label="lab_snh_RelatedPartyTransactionBusinessManagementFeesRelatedtoSubsidiaryLevelManagement_941FF4D2BB0A24578ACD0D6E76CA57EF" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Related Party Transaction Business Management Fees Related to Subsidiary Level Management</link:label>
    <link:loc xlink:href="snh-20190331.xsd#snh_RelatedPartyTransactionBusinessManagementFeesRelatedtoSubsidiaryLevelManagement" xlink:label="loc_snh_RelatedPartyTransactionBusinessManagementFeesRelatedtoSubsidiaryLevelManagement_941FF4D2BB0A24578ACD0D6E76CA57EF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_snh_RelatedPartyTransactionBusinessManagementFeesRelatedtoSubsidiaryLevelManagement_941FF4D2BB0A24578ACD0D6E76CA57EF" xlink:to="lab_snh_RelatedPartyTransactionBusinessManagementFeesRelatedtoSubsidiaryLevelManagement_941FF4D2BB0A24578ACD0D6E76CA57EF" xlink:type="arc" />
    <link:label id="lab_snh_RelatedPartyTransactionBusinessManagementAgreementAnnualIncentiveFeeEstimateIncludedinManagementFees_58FC5BF0EC5039A292030D6E76CACFA1_terseLabel_en-US" xlink:label="lab_snh_RelatedPartyTransactionBusinessManagementAgreementAnnualIncentiveFeeEstimateIncludedinManagementFees_58FC5BF0EC5039A292030D6E76CACFA1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Related party transaction business management agreement, annual incentive fee estimate included in management fees</link:label>
    <link:label id="lab_snh_RelatedPartyTransactionBusinessManagementAgreementAnnualIncentiveFeeEstimateIncludedinManagementFees_58FC5BF0EC5039A292030D6E76CACFA1_label_en-US" xlink:label="lab_snh_RelatedPartyTransactionBusinessManagementAgreementAnnualIncentiveFeeEstimateIncludedinManagementFees_58FC5BF0EC5039A292030D6E76CACFA1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Related Party Transaction, Business Management Agreement Annual Incentive Fee Estimate Included in Management Fees</link:label>
    <link:label id="lab_snh_RelatedPartyTransactionBusinessManagementAgreementAnnualIncentiveFeeEstimateIncludedinManagementFees_58FC5BF0EC5039A292030D6E76CACFA1_documentation_en-US" xlink:label="lab_snh_RelatedPartyTransactionBusinessManagementAgreementAnnualIncentiveFeeEstimateIncludedinManagementFees_58FC5BF0EC5039A292030D6E76CACFA1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Related Party Transaction, Business Management Agreement Annual Incentive Fee Estimate Included in Management Fees</link:label>
    <link:loc xlink:href="snh-20190331.xsd#snh_RelatedPartyTransactionBusinessManagementAgreementAnnualIncentiveFeeEstimateIncludedinManagementFees" xlink:label="loc_snh_RelatedPartyTransactionBusinessManagementAgreementAnnualIncentiveFeeEstimateIncludedinManagementFees_58FC5BF0EC5039A292030D6E76CACFA1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_snh_RelatedPartyTransactionBusinessManagementAgreementAnnualIncentiveFeeEstimateIncludedinManagementFees_58FC5BF0EC5039A292030D6E76CACFA1" xlink:to="lab_snh_RelatedPartyTransactionBusinessManagementAgreementAnnualIncentiveFeeEstimateIncludedinManagementFees_58FC5BF0EC5039A292030D6E76CACFA1" xlink:type="arc" />
    <link:label id="lab_snh_RelatedPartyTransactionBusinessManagementAgreementIncentiveFeePaid_C5C151720ECEE8634D630D6E76CA10CC_terseLabel_en-US" xlink:label="lab_snh_RelatedPartyTransactionBusinessManagementAgreementIncentiveFeePaid_C5C151720ECEE8634D630D6E76CA10CC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Related party transaction business management agreement incentive fee paid</link:label>
    <link:label id="lab_snh_RelatedPartyTransactionBusinessManagementAgreementIncentiveFeePaid_C5C151720ECEE8634D630D6E76CA10CC_label_en-US" xlink:label="lab_snh_RelatedPartyTransactionBusinessManagementAgreementIncentiveFeePaid_C5C151720ECEE8634D630D6E76CA10CC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Related Party Transaction Business Management Agreement Incentive Fee Paid</link:label>
    <link:label id="lab_snh_RelatedPartyTransactionBusinessManagementAgreementIncentiveFeePaid_C5C151720ECEE8634D630D6E76CA10CC_documentation_en-US" xlink:label="lab_snh_RelatedPartyTransactionBusinessManagementAgreementIncentiveFeePaid_C5C151720ECEE8634D630D6E76CA10CC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Related Party Transaction Business Management Agreement Incentive Fee Paid</link:label>
    <link:loc xlink:href="snh-20190331.xsd#snh_RelatedPartyTransactionBusinessManagementAgreementIncentiveFeePaid" xlink:label="loc_snh_RelatedPartyTransactionBusinessManagementAgreementIncentiveFeePaid_C5C151720ECEE8634D630D6E76CA10CC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_snh_RelatedPartyTransactionBusinessManagementAgreementIncentiveFeePaid_C5C151720ECEE8634D630D6E76CA10CC" xlink:to="lab_snh_RelatedPartyTransactionBusinessManagementAgreementIncentiveFeePaid_C5C151720ECEE8634D630D6E76CA10CC" xlink:type="arc" />
    <link:label id="lab_snh_RelatedPartyTransactionPropertyManagementAndConstructionSupervisionFees_2D87FB9641BEC8C57DC90D6E76CA353D_terseLabel_en-US" xlink:label="lab_snh_RelatedPartyTransactionPropertyManagementAndConstructionSupervisionFees_2D87FB9641BEC8C57DC90D6E76CA353D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Property management and construction supervision fees</link:label>
    <link:label id="lab_snh_RelatedPartyTransactionPropertyManagementAndConstructionSupervisionFees_2D87FB9641BEC8C57DC90D6E76CA353D_label_en-US" xlink:label="lab_snh_RelatedPartyTransactionPropertyManagementAndConstructionSupervisionFees_2D87FB9641BEC8C57DC90D6E76CA353D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Related Party Transaction Property Management and Construction Supervision Fees</link:label>
    <link:label id="lab_snh_RelatedPartyTransactionPropertyManagementAndConstructionSupervisionFees_2D87FB9641BEC8C57DC90D6E76CA353D_documentation_en-US" xlink:label="lab_snh_RelatedPartyTransactionPropertyManagementAndConstructionSupervisionFees_2D87FB9641BEC8C57DC90D6E76CA353D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the property management and construction supervision fees incurred pursuant to business and property management agreements with related parties.</link:label>
    <link:loc xlink:href="snh-20190331.xsd#snh_RelatedPartyTransactionPropertyManagementAndConstructionSupervisionFees" xlink:label="loc_snh_RelatedPartyTransactionPropertyManagementAndConstructionSupervisionFees_2D87FB9641BEC8C57DC90D6E76CA353D" xlink:type="locator" />
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    <link:label id="lab_us-gaap_RelatedPartyTransactionAxis_55F89F3757C7B8D0ED4397EB178A381F_label_en-US" xlink:label="lab_us-gaap_RelatedPartyTransactionAxis_55F89F3757C7B8D0ED4397EB178A381F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Related Party Transaction [Axis]</link:label>
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    <link:label id="lab_us-gaap_RelatedPartyTransactionDomain_5BC90307A33003329AA497EB178B686D_label_en-US" xlink:label="lab_us-gaap_RelatedPartyTransactionDomain_5BC90307A33003329AA497EB178B686D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Related Party Transaction [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RelatedPartyTransactionDomain" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_5BC90307A33003329AA497EB178B686D" xlink:type="locator" />
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    <link:label id="lab_snh_RehabilitationServicesMember_E63242B2597267E1B00097EB178BD6F0_terseLabel_en-US" xlink:label="lab_snh_RehabilitationServicesMember_E63242B2597267E1B00097EB178BD6F0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Rehabilitation Services</link:label>
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    <link:label id="lab_us-gaap_ConcentrationRiskByTypeAxis_2B049DD385F6D85E789497EB178D2EB0_label_en-US" xlink:label="lab_us-gaap_ConcentrationRiskByTypeAxis_2B049DD385F6D85E789497EB178D2EB0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Concentration Risk Type [Axis]</link:label>
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    <link:label id="lab_us-gaap_ConcentrationRiskTypeDomain_A15BDB34DFB8C5EB1A5797EB178D2A1F_terseLabel_en-US" xlink:label="lab_us-gaap_ConcentrationRiskTypeDomain_A15BDB34DFB8C5EB1A5797EB178D2A1F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Concentration Risk Type [Domain]</link:label>
    <link:label id="lab_us-gaap_ConcentrationRiskTypeDomain_A15BDB34DFB8C5EB1A5797EB178D2A1F_label_en-US" xlink:label="lab_us-gaap_ConcentrationRiskTypeDomain_A15BDB34DFB8C5EB1A5797EB178D2A1F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Concentration Risk Type [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ConcentrationRiskTypeDomain" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_A15BDB34DFB8C5EB1A5797EB178D2A1F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_A15BDB34DFB8C5EB1A5797EB178D2A1F" xlink:to="lab_us-gaap_ConcentrationRiskTypeDomain_A15BDB34DFB8C5EB1A5797EB178D2A1F" xlink:type="arc" />
    <link:label id="lab_us-gaap_CustomerConcentrationRiskMember_6FF9FD503A1B3D0A621B97EB178D518D_terseLabel_en-US" xlink:label="lab_us-gaap_CustomerConcentrationRiskMember_6FF9FD503A1B3D0A621B97EB178D518D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Rents from significant lessee</link:label>
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    <link:label id="lab_us-gaap_ConcentrationRiskByBenchmarkAxis_ACDABE5D3EF54BA2B07B97EB178D878B_label_en-US" xlink:label="lab_us-gaap_ConcentrationRiskByBenchmarkAxis_ACDABE5D3EF54BA2B07B97EB178D878B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Concentration Risk Benchmark [Axis]</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ConcentrationRiskBenchmarkDomain" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_5551139D2A5F3414E58997EB178E26D7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_5551139D2A5F3414E58997EB178E26D7" xlink:to="lab_us-gaap_ConcentrationRiskBenchmarkDomain_5551139D2A5F3414E58997EB178E26D7" xlink:type="arc" />
    <link:label id="lab_snh_RealEstateInvestmentPropertyAtCostMember_69E3C3D73A04F31978B997EB178EC104_terseLabel_en-US" xlink:label="lab_snh_RealEstateInvestmentPropertyAtCostMember_69E3C3D73A04F31978B997EB178EC104" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Investment</link:label>
    <link:label id="lab_snh_RealEstateInvestmentPropertyAtCostMember_69E3C3D73A04F31978B997EB178EC104_label_en-US" xlink:label="lab_snh_RealEstateInvestmentPropertyAtCostMember_69E3C3D73A04F31978B997EB178EC104" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Real Estate Investment Property At Cost [Member]</link:label>
    <link:label id="lab_snh_RealEstateInvestmentPropertyAtCostMember_69E3C3D73A04F31978B997EB178EC104_documentation_en-US" xlink:label="lab_snh_RealEstateInvestmentPropertyAtCostMember_69E3C3D73A04F31978B997EB178EC104" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Real estate investment property, at cost, when it serves as a benchmark in a concentration of risk calculation, representing the sum of all reported real estate investment property, at cost, as of the balance sheet date.</link:label>
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    <link:label id="lab_us-gaap_StatementLineItems_62601E86AA64C46A68CD97EB178EDC33_verboseLabel_en-US" xlink:label="lab_us-gaap_StatementLineItems_62601E86AA64C46A68CD97EB178EDC33" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Summarized financial information of significant tenant</link:label>
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    <link:label id="lab_snh_NumberofCommunitiesLeasedbytheCompany_7990558BD4FB61B7F40397EB178EFDE2_terseLabel_en-US" xlink:label="lab_snh_NumberofCommunitiesLeasedbytheCompany_7990558BD4FB61B7F40397EB178EFDE2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of communities leased by the Company</link:label>
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    <link:loc xlink:href="snh-20190331.xsd#snh_NumberofCommunitiesLeasedbytheCompany" xlink:label="loc_snh_NumberofCommunitiesLeasedbytheCompany_7990558BD4FB61B7F40397EB178EFDE2" xlink:type="locator" />
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    <link:label id="lab_us-gaap_RelatedPartyTransactionAmountsOfTransaction_6C04D86215E1C1BDEF5D980504776BB3_verboseLabel_en-US" xlink:label="lab_us-gaap_RelatedPartyTransactionAmountsOfTransaction_6C04D86215E1C1BDEF5D980504776BB3" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Total rental income recognized</link:label>
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    <link:loc xlink:href="snh-20190331.xsd#snh_RelatedPartyTransactionAnnualRentsDue" xlink:label="loc_snh_RelatedPartyTransactionAnnualRentsDue_C021D925F69227D8373197EB178FD659" xlink:type="locator" />
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    <link:label id="lab_snh_RentsReceivable_089AF982F9424F6A1FD897EB178FCB85_terseLabel_en-US" xlink:label="lab_snh_RentsReceivable_089AF982F9424F6A1FD897EB178FCB85" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Rents receivable</link:label>
    <link:label id="lab_snh_RentsReceivable_089AF982F9424F6A1FD897EB178FCB85_label_en-US" xlink:label="lab_snh_RentsReceivable_089AF982F9424F6A1FD897EB178FCB85" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Rents Receivable</link:label>
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    <link:label id="lab_snh_SeniorUnsecuredNotesDue2019Member_E71CD130B70D6855407597EB18103457_documentation_en-US" xlink:label="lab_snh_SeniorUnsecuredNotesDue2019Member_E71CD130B70D6855407597EB18103457" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the senior unsecured notes due 2019.</link:label>
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    <link:label id="lab_snh_SeniorUnsecuredNotes6.75PercentDue2021Member_8A92D19E6816C90578AA97EB1810D100_documentation_en-US" xlink:label="lab_snh_SeniorUnsecuredNotes6.75PercentDue2021Member_8A92D19E6816C90578AA97EB1810D100" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This element represents the senior unsecured notes that bear an interest rate of 6.75 percent due 2021.</link:label>
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    <link:label id="lab_snh_SeniorUnsecuredNotes4.75PercentDue2024Member_997213922BCDBFA2478D97EB1811C743_terseLabel_en-US" xlink:label="lab_snh_SeniorUnsecuredNotes4.75PercentDue2024Member_997213922BCDBFA2478D97EB1811C743" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Senior unsecured notes due 2024</link:label>
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    <link:label id="lab_snh_SeniorUnsecuredNotes4.75PercentDue2028Member_8B8D2A34333CCECCCAC097EB1811D7ED_documentation_en-US" xlink:label="lab_snh_SeniorUnsecuredNotes4.75PercentDue2028Member_8B8D2A34333CCECCCAC097EB1811D7ED" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Senior Unsecured Notes 4.75 Percent Due 2028 [Member]</link:label>
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    <link:label id="lab_snh_SeniorUnsecuredNotes5.625PercentDue2042Member_2FC30050B2BE29919F4D97EB18113352_terseLabel_en-US" xlink:label="lab_snh_SeniorUnsecuredNotes5.625PercentDue2042Member_2FC30050B2BE29919F4D97EB18113352" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Senior unsecured notes due 2042</link:label>
    <link:label id="lab_snh_SeniorUnsecuredNotes5.625PercentDue2042Member_2FC30050B2BE29919F4D97EB18113352_label_en-US" xlink:label="lab_snh_SeniorUnsecuredNotes5.625PercentDue2042Member_2FC30050B2BE29919F4D97EB18113352" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Senior Unsecured Notes 5.625 Percent Due 2042 [Member]</link:label>
    <link:label id="lab_snh_SeniorUnsecuredNotes5.625PercentDue2042Member_2FC30050B2BE29919F4D97EB18113352_documentation_en-US" xlink:label="lab_snh_SeniorUnsecuredNotes5.625PercentDue2042Member_2FC30050B2BE29919F4D97EB18113352" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This element represents the senior unsecured notes that bear an interest rate of 5.625 percent due 2042.</link:label>
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    <link:label id="lab_snh_SeniorUnsecuredNotes6.25DueIn2046Member_40D64A0D78CB77EAC93597EB181170D1_terseLabel_en-US" xlink:label="lab_snh_SeniorUnsecuredNotes6.25DueIn2046Member_40D64A0D78CB77EAC93597EB181170D1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Senior unsecured notes due 2046</link:label>
    <link:label id="lab_snh_SeniorUnsecuredNotes6.25DueIn2046Member_40D64A0D78CB77EAC93597EB181170D1_label_en-US" xlink:label="lab_snh_SeniorUnsecuredNotes6.25DueIn2046Member_40D64A0D78CB77EAC93597EB181170D1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Senior Unsecured Notes 6.25% Due In 2046 [Member]</link:label>
    <link:label id="lab_snh_SeniorUnsecuredNotes6.25DueIn2046Member_40D64A0D78CB77EAC93597EB181170D1_documentation_en-US" xlink:label="lab_snh_SeniorUnsecuredNotes6.25DueIn2046Member_40D64A0D78CB77EAC93597EB181170D1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Senior Unsecured Notes 6.25% Due In 2046 [Member]</link:label>
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    <link:label id="lab_snh_TermLoanDue2020Member_897488E4E764DCFD9F5597EB1811E0BB_terseLabel_en-US" xlink:label="lab_snh_TermLoanDue2020Member_897488E4E764DCFD9F5597EB1811E0BB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Term loan due 2020</link:label>
    <link:label id="lab_snh_TermLoanDue2020Member_897488E4E764DCFD9F5597EB1811E0BB_label_en-US" xlink:label="lab_snh_TermLoanDue2020Member_897488E4E764DCFD9F5597EB1811E0BB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Term Loan Due 2020 [Member]</link:label>
    <link:label id="lab_snh_TermLoanDue2020Member_897488E4E764DCFD9F5597EB1811E0BB_documentation_en-US" xlink:label="lab_snh_TermLoanDue2020Member_897488E4E764DCFD9F5597EB1811E0BB" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">A term loan is a monetary loan that is repaid in regular payments over a set period of time.</link:label>
    <link:loc xlink:href="snh-20190331.xsd#snh_TermLoanDue2020Member" xlink:label="loc_snh_TermLoanDue2020Member_897488E4E764DCFD9F5597EB1811E0BB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_snh_TermLoanDue2020Member_897488E4E764DCFD9F5597EB1811E0BB" xlink:to="lab_snh_TermLoanDue2020Member_897488E4E764DCFD9F5597EB1811E0BB" xlink:type="arc" />
    <link:label id="lab_snh_TermLoanDue2022Member_786AE5BAFC96063B39B097EB1812B238_terseLabel_en-US" xlink:label="lab_snh_TermLoanDue2022Member_786AE5BAFC96063B39B097EB1812B238" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Term loan due 2022</link:label>
    <link:label id="lab_snh_TermLoanDue2022Member_786AE5BAFC96063B39B097EB1812B238_label_en-US" xlink:label="lab_snh_TermLoanDue2022Member_786AE5BAFC96063B39B097EB1812B238" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Term Loan Due 2022 [Member]</link:label>
    <link:label id="lab_snh_TermLoanDue2022Member_786AE5BAFC96063B39B097EB1812B238_documentation_en-US" xlink:label="lab_snh_TermLoanDue2022Member_786AE5BAFC96063B39B097EB1812B238" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">A term loan is a monetary loan that is repaid in regular payments over a set period of time.</link:label>
    <link:loc xlink:href="snh-20190331.xsd#snh_TermLoanDue2022Member" xlink:label="loc_snh_TermLoanDue2022Member_786AE5BAFC96063B39B097EB1812B238" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_snh_TermLoanDue2022Member_786AE5BAFC96063B39B097EB1812B238" xlink:to="lab_snh_TermLoanDue2022Member_786AE5BAFC96063B39B097EB1812B238" xlink:type="arc" />
    <link:label id="lab_us-gaap_MortgagesMember_C7F917CF6FF1E08C8A6F97EB1812C089_terseLabel_en-US" xlink:label="lab_us-gaap_MortgagesMember_C7F917CF6FF1E08C8A6F97EB1812C089" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Mortgages</link:label>
    <link:label id="lab_us-gaap_MortgagesMember_C7F917CF6FF1E08C8A6F97EB1812C089_label_en-US" xlink:label="lab_us-gaap_MortgagesMember_C7F917CF6FF1E08C8A6F97EB1812C089" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Mortgages [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_MortgagesMember" xlink:label="loc_us-gaap_MortgagesMember_C7F917CF6FF1E08C8A6F97EB1812C089" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_MortgagesMember_C7F917CF6FF1E08C8A6F97EB1812C089" xlink:to="lab_us-gaap_MortgagesMember_C7F917CF6FF1E08C8A6F97EB1812C089" xlink:type="arc" />
    <link:label id="lab_us-gaap_CapitalLeaseObligationsMember_7E8A11839169656665E597EB18123658_terseLabel_en-US" xlink:label="lab_us-gaap_CapitalLeaseObligationsMember_7E8A11839169656665E597EB18123658" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Capital leases</link:label>
    <link:label id="lab_us-gaap_CapitalLeaseObligationsMember_7E8A11839169656665E597EB18123658_label_en-US" xlink:label="lab_us-gaap_CapitalLeaseObligationsMember_7E8A11839169656665E597EB18123658" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Capital Lease Obligations [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CapitalLeaseObligationsMember" xlink:label="loc_us-gaap_CapitalLeaseObligationsMember_7E8A11839169656665E597EB18123658" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CapitalLeaseObligationsMember_7E8A11839169656665E597EB18123658" xlink:to="lab_us-gaap_CapitalLeaseObligationsMember_7E8A11839169656665E597EB18123658" xlink:type="arc" />
    <link:label id="lab_us-gaap_VariableRateAxis_B450459B3BBE09E2AA5E97EB1813543B_terseLabel_en-US" xlink:label="lab_us-gaap_VariableRateAxis_B450459B3BBE09E2AA5E97EB1813543B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Variable Rate [Axis]</link:label>
    <link:label id="lab_us-gaap_VariableRateAxis_B450459B3BBE09E2AA5E97EB1813543B_label_en-US" xlink:label="lab_us-gaap_VariableRateAxis_B450459B3BBE09E2AA5E97EB1813543B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Variable Rate [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_VariableRateAxis" xlink:label="loc_us-gaap_VariableRateAxis_B450459B3BBE09E2AA5E97EB1813543B" xlink:type="locator" />
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    <link:label id="lab_us-gaap_VariableRateDomain_979B0E3C34CD167DB23D97EB18136C34_terseLabel_en-US" xlink:label="lab_us-gaap_VariableRateDomain_979B0E3C34CD167DB23D97EB18136C34" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Variable Rate [Domain]</link:label>
    <link:label id="lab_us-gaap_VariableRateDomain_979B0E3C34CD167DB23D97EB18136C34_label_en-US" xlink:label="lab_us-gaap_VariableRateDomain_979B0E3C34CD167DB23D97EB18136C34" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Variable Rate [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_VariableRateDomain" xlink:label="loc_us-gaap_VariableRateDomain_979B0E3C34CD167DB23D97EB18136C34" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LondonInterbankOfferedRateLIBORMember_C42282CC116A18EFF62297EB18139241_terseLabel_en-US" xlink:label="lab_us-gaap_LondonInterbankOfferedRateLIBORMember_C42282CC116A18EFF62297EB18139241" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">LIBOR</link:label>
    <link:label id="lab_us-gaap_LondonInterbankOfferedRateLIBORMember_C42282CC116A18EFF62297EB18139241_label_en-US" xlink:label="lab_us-gaap_LondonInterbankOfferedRateLIBORMember_C42282CC116A18EFF62297EB18139241" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">London Interbank Offered Rate (LIBOR) [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LondonInterbankOfferedRateLIBORMember" xlink:label="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_C42282CC116A18EFF62297EB18139241" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DebtInstrumentLineItems_52A862E83C1C9E780F2797EB181409D2_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentLineItems_52A862E83C1C9E780F2797EB181409D2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Indebtedness</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentLineItems_52A862E83C1C9E780F2797EB181409D2_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentLineItems_52A862E83C1C9E780F2797EB181409D2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_52A862E83C1C9E780F2797EB181409D2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentLineItems_52A862E83C1C9E780F2797EB181409D2" xlink:to="lab_us-gaap_DebtInstrumentLineItems_52A862E83C1C9E780F2797EB181409D2" xlink:type="arc" />
    <link:label id="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_7EE7FE93F01D04C340AC97EB18148750_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_7EE7FE93F01D04C340AC97EB18148750" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unsecured revolving credit facility, maximum borrowing capacity</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_7EE7FE93F01D04C340AC97EB18148750" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_7EE7FE93F01D04C340AC97EB18148750" xlink:to="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_7EE7FE93F01D04C340AC97EB18148750" xlink:type="arc" />
    <link:label id="lab_snh_NumberOfPublicIssuesOfUnsecuredSeniorNotes_20464AEDD2F2BF1256B497EB1814D08E_terseLabel_en-US" xlink:label="lab_snh_NumberOfPublicIssuesOfUnsecuredSeniorNotes_20464AEDD2F2BF1256B497EB1814D08E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of public issues of unsecured senior notes</link:label>
    <link:label id="lab_snh_NumberOfPublicIssuesOfUnsecuredSeniorNotes_20464AEDD2F2BF1256B497EB1814D08E_label_en-US" xlink:label="lab_snh_NumberOfPublicIssuesOfUnsecuredSeniorNotes_20464AEDD2F2BF1256B497EB1814D08E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number of Public Issues of Unsecured Senior Notes</link:label>
    <link:label id="lab_snh_NumberOfPublicIssuesOfUnsecuredSeniorNotes_20464AEDD2F2BF1256B497EB1814D08E_documentation_en-US" xlink:label="lab_snh_NumberOfPublicIssuesOfUnsecuredSeniorNotes_20464AEDD2F2BF1256B497EB1814D08E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the number of public issues of unsecured senior notes.</link:label>
    <link:loc xlink:href="snh-20190331.xsd#snh_NumberOfPublicIssuesOfUnsecuredSeniorNotes" xlink:label="loc_snh_NumberOfPublicIssuesOfUnsecuredSeniorNotes_20464AEDD2F2BF1256B497EB1814D08E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_snh_NumberOfPublicIssuesOfUnsecuredSeniorNotes_20464AEDD2F2BF1256B497EB1814D08E" xlink:to="lab_snh_NumberOfPublicIssuesOfUnsecuredSeniorNotes_20464AEDD2F2BF1256B497EB1814D08E" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentFaceAmount_A1C8DEC54FEA3742A61297EB18143E8E_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentFaceAmount_A1C8DEC54FEA3742A61297EB18143E8E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt face amount</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentFaceAmount_A1C8DEC54FEA3742A61297EB18143E8E_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentFaceAmount_A1C8DEC54FEA3742A61297EB18143E8E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Face Amount</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentFaceAmount" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_A1C8DEC54FEA3742A61297EB18143E8E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentFaceAmount_A1C8DEC54FEA3742A61297EB18143E8E" xlink:to="lab_us-gaap_DebtInstrumentFaceAmount_A1C8DEC54FEA3742A61297EB18143E8E" xlink:type="arc" />
    <link:label id="lab_us-gaap_SecuredDebt_A9F2A9009585D68CDB9297EB1815584F_terseLabel_en-US" xlink:label="lab_us-gaap_SecuredDebt_A9F2A9009585D68CDB9297EB1815584F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Aggregate principal amount of mortgage debt</link:label>
    <link:label id="lab_us-gaap_SecuredDebt_A9F2A9009585D68CDB9297EB1815584F_label_en-US" xlink:label="lab_us-gaap_SecuredDebt_A9F2A9009585D68CDB9297EB1815584F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Secured Debt</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SecuredDebt" xlink:label="loc_us-gaap_SecuredDebt_A9F2A9009585D68CDB9297EB1815584F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SecuredDebt_A9F2A9009585D68CDB9297EB1815584F" xlink:to="lab_us-gaap_SecuredDebt_A9F2A9009585D68CDB9297EB1815584F" xlink:type="arc" />
    <link:label id="lab_snh_NumberOfBuildingsCollateralized_84EA1B4A433AB030A5A397EB18151B4D_terseLabel_en-US" xlink:label="lab_snh_NumberOfBuildingsCollateralized_84EA1B4A433AB030A5A397EB18151B4D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of buildings mortgaged</link:label>
    <link:label id="lab_snh_NumberOfBuildingsCollateralized_84EA1B4A433AB030A5A397EB18151B4D_label_en-US" xlink:label="lab_snh_NumberOfBuildingsCollateralized_84EA1B4A433AB030A5A397EB18151B4D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number of Buildings Collateralized</link:label>
    <link:label id="lab_snh_NumberOfBuildingsCollateralized_84EA1B4A433AB030A5A397EB18151B4D_documentation_en-US" xlink:label="lab_snh_NumberOfBuildingsCollateralized_84EA1B4A433AB030A5A397EB18151B4D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The number of buildings serving as collateral for debt as of the balance sheet date.</link:label>
    <link:loc xlink:href="snh-20190331.xsd#snh_NumberOfBuildingsCollateralized" xlink:label="loc_snh_NumberOfBuildingsCollateralized_84EA1B4A433AB030A5A397EB18151B4D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_snh_NumberOfBuildingsCollateralized_84EA1B4A433AB030A5A397EB18151B4D" xlink:to="lab_snh_NumberOfBuildingsCollateralized_84EA1B4A433AB030A5A397EB18151B4D" xlink:type="arc" />
    <link:label id="lab_us-gaap_RealEstateInvestmentPropertyAtCost_272D10842742F5FA98FE97EB18151C09_terseLabel_en-US" xlink:label="lab_us-gaap_RealEstateInvestmentPropertyAtCost_272D10842742F5FA98FE97EB18151C09" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total real estate properties, gross</link:label>
    <link:label id="lab_us-gaap_RealEstateInvestmentPropertyAtCost_272D10842742F5FA98FE97EB18151C09_label_en-US" xlink:label="lab_us-gaap_RealEstateInvestmentPropertyAtCost_272D10842742F5FA98FE97EB18151C09" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Real Estate Investment Property, at Cost</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RealEstateInvestmentPropertyAtCost" xlink:label="loc_us-gaap_RealEstateInvestmentPropertyAtCost_272D10842742F5FA98FE97EB18151C09" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RealEstateInvestmentPropertyAtCost_272D10842742F5FA98FE97EB18151C09" xlink:to="lab_us-gaap_RealEstateInvestmentPropertyAtCost_272D10842742F5FA98FE97EB18151C09" xlink:type="arc" />
    <link:label id="lab_snh_RealEstateInvestmentPropertyLeaseObligations_258195192B42584876429800A652CE50_terseLabel_en-US" xlink:label="lab_snh_RealEstateInvestmentPropertyLeaseObligations_258195192B42584876429800A652CE50" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Lease obligations</link:label>
    <link:label id="lab_snh_RealEstateInvestmentPropertyLeaseObligations_258195192B42584876429800A652CE50_label_en-US" xlink:label="lab_snh_RealEstateInvestmentPropertyLeaseObligations_258195192B42584876429800A652CE50" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Real Estate Investment Property, Lease Obligations</link:label>
    <link:label id="lab_snh_RealEstateInvestmentPropertyLeaseObligations_258195192B42584876429800A652CE50_documentation_en-US" xlink:label="lab_snh_RealEstateInvestmentPropertyLeaseObligations_258195192B42584876429800A652CE50" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Real Estate Investment Property, Lease Obligations</link:label>
    <link:loc xlink:href="snh-20190331.xsd#snh_RealEstateInvestmentPropertyLeaseObligations" xlink:label="loc_snh_RealEstateInvestmentPropertyLeaseObligations_258195192B42584876429800A652CE50" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_snh_RealEstateInvestmentPropertyLeaseObligations_258195192B42584876429800A652CE50" xlink:to="lab_snh_RealEstateInvestmentPropertyLeaseObligations_258195192B42584876429800A652CE50" xlink:type="arc" />
    <link:label id="lab_snh_LineofCreditFacilityRequiredPrincipalPaymentBeforeMaturity_8C0B447BDE0EA33685CE97EB1815BA59_terseLabel_en-US" xlink:label="lab_snh_LineofCreditFacilityRequiredPrincipalPaymentBeforeMaturity_8C0B447BDE0EA33685CE97EB1815BA59" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Line of credit facility, periodic payment, principal</link:label>
    <link:label id="lab_snh_LineofCreditFacilityRequiredPrincipalPaymentBeforeMaturity_8C0B447BDE0EA33685CE97EB1815BA59_label_en-US" xlink:label="lab_snh_LineofCreditFacilityRequiredPrincipalPaymentBeforeMaturity_8C0B447BDE0EA33685CE97EB1815BA59" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Line of Credit Facility Required Principal Payment Before Maturity</link:label>
    <link:label id="lab_snh_LineofCreditFacilityRequiredPrincipalPaymentBeforeMaturity_8C0B447BDE0EA33685CE97EB1815BA59_documentation_en-US" xlink:label="lab_snh_LineofCreditFacilityRequiredPrincipalPaymentBeforeMaturity_8C0B447BDE0EA33685CE97EB1815BA59" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Line of Credit Facility Required Principal Payment Before Maturity</link:label>
    <link:loc xlink:href="snh-20190331.xsd#snh_LineofCreditFacilityRequiredPrincipalPaymentBeforeMaturity" xlink:label="loc_snh_LineofCreditFacilityRequiredPrincipalPaymentBeforeMaturity_8C0B447BDE0EA33685CE97EB1815BA59" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_AAF5B0CAF3024873B68097EB1815E7BE_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_AAF5B0CAF3024873B68097EB1815E7BE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Interest rate added to the base rate (as a percent)</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_AAF5B0CAF3024873B68097EB1815E7BE_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_AAF5B0CAF3024873B68097EB1815E7BE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Basis Spread on Variable Rate</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_AAF5B0CAF3024873B68097EB1815E7BE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_AAF5B0CAF3024873B68097EB1815E7BE" xlink:to="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_AAF5B0CAF3024873B68097EB1815E7BE" xlink:type="arc" />
    <link:label id="lab_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_C878CD40DC256F51D96897EB18163F73_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_C878CD40DC256F51D96897EB18163F73" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt instrument, facility fee (as a percent)</link:label>
    <link:label id="lab_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_C878CD40DC256F51D96897EB18163F73_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_C878CD40DC256F51D96897EB18163F73" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Commitment Fee Percentage</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LineOfCreditFacilityCommitmentFeePercentage" xlink:label="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_C878CD40DC256F51D96897EB18163F73" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_C878CD40DC256F51D96897EB18163F73" xlink:to="lab_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_C878CD40DC256F51D96897EB18163F73" xlink:type="arc" />
    <link:label id="lab_us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd_56EC6E534BF383CF3FBC97EB1816D605_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd_56EC6E534BF383CF3FBC97EB1816D605" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Revolving credit facility, interest rate payable (as a percent)</link:label>
    <link:label id="lab_us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd_56EC6E534BF383CF3FBC97EB1816D605_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd_56EC6E534BF383CF3FBC97EB1816D605" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Interest Rate at Period End</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd" xlink:label="loc_us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd_56EC6E534BF383CF3FBC97EB1816D605" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd_56EC6E534BF383CF3FBC97EB1816D605" xlink:to="lab_us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd_56EC6E534BF383CF3FBC97EB1816D605" xlink:type="arc" />
    <link:label id="lab_snh_DebtWeightedAverageInterestRateDuringThePeriod_7667A4AC6288D031022597EB1816BC1B_terseLabel_en-US" xlink:label="lab_snh_DebtWeightedAverageInterestRateDuringThePeriod_7667A4AC6288D031022597EB1816BC1B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Weighted average interest rate on debt (as a percent)</link:label>
    <link:label id="lab_snh_DebtWeightedAverageInterestRateDuringThePeriod_7667A4AC6288D031022597EB1816BC1B_label_en-US" xlink:label="lab_snh_DebtWeightedAverageInterestRateDuringThePeriod_7667A4AC6288D031022597EB1816BC1B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Weighted Average Interest Rate During The Period</link:label>
    <link:label id="lab_snh_DebtWeightedAverageInterestRateDuringThePeriod_7667A4AC6288D031022597EB1816BC1B_documentation_en-US" xlink:label="lab_snh_DebtWeightedAverageInterestRateDuringThePeriod_7667A4AC6288D031022597EB1816BC1B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Weighted average interest rate on debt during the period.</link:label>
    <link:loc xlink:href="snh-20190331.xsd#snh_DebtWeightedAverageInterestRateDuringThePeriod" xlink:label="loc_snh_DebtWeightedAverageInterestRateDuringThePeriod_7667A4AC6288D031022597EB1816BC1B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_snh_DebtWeightedAverageInterestRateDuringThePeriod_7667A4AC6288D031022597EB1816BC1B" xlink:to="lab_snh_DebtWeightedAverageInterestRateDuringThePeriod_7667A4AC6288D031022597EB1816BC1B" xlink:type="arc" />
    <link:label id="lab_us-gaap_LineOfCredit_93B719ABCE2EA5FE560197EB1816CF07_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCredit_93B719ABCE2EA5FE560197EB1816CF07" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unsecured revolving credit facility</link:label>
    <link:label id="lab_us-gaap_LineOfCredit_93B719ABCE2EA5FE560197EB1816CF07_label_en-US" xlink:label="lab_us-gaap_LineOfCredit_93B719ABCE2EA5FE560197EB1816CF07" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Line of Credit</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LineOfCredit" xlink:label="loc_us-gaap_LineOfCredit_93B719ABCE2EA5FE560197EB1816CF07" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCredit_93B719ABCE2EA5FE560197EB1816CF07" xlink:to="lab_us-gaap_LineOfCredit_93B719ABCE2EA5FE560197EB1816CF07" xlink:type="arc" />
    <link:label id="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_15D6352BCE42D8C20C5697EB18162A59_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_15D6352BCE42D8C20C5697EB18162A59" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Revolving credit facility, available amount</link:label>
    <link:label id="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_15D6352BCE42D8C20C5697EB18162A59_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_15D6352BCE42D8C20C5697EB18162A59" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Remaining Borrowing Capacity</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_15D6352BCE42D8C20C5697EB18162A59" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_15D6352BCE42D8C20C5697EB18162A59" xlink:to="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_15D6352BCE42D8C20C5697EB18162A59" xlink:type="arc" />
    <link:label id="lab_snh_DebtInstrumentMaximumBorrowingCapacityOptionToIncrease_4BA1984BFB156C12D97097EB1817C7A6_terseLabel_en-US" xlink:label="lab_snh_DebtInstrumentMaximumBorrowingCapacityOptionToIncrease_4BA1984BFB156C12D97097EB1817C7A6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Maximum borrowing capacity that may be increased (up to)</link:label>
    <link:label id="lab_snh_DebtInstrumentMaximumBorrowingCapacityOptionToIncrease_4BA1984BFB156C12D97097EB1817C7A6_label_en-US" xlink:label="lab_snh_DebtInstrumentMaximumBorrowingCapacityOptionToIncrease_4BA1984BFB156C12D97097EB1817C7A6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument Maximum Borrowing Capacity Option to Increase</link:label>
    <link:label id="lab_snh_DebtInstrumentMaximumBorrowingCapacityOptionToIncrease_4BA1984BFB156C12D97097EB1817C7A6_documentation_en-US" xlink:label="lab_snh_DebtInstrumentMaximumBorrowingCapacityOptionToIncrease_4BA1984BFB156C12D97097EB1817C7A6" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the maximum borrowing capacity to which loan may be expanded per the terms of the agreement, at the option of the reporting entity.</link:label>
    <link:loc xlink:href="snh-20190331.xsd#snh_DebtInstrumentMaximumBorrowingCapacityOptionToIncrease" xlink:label="loc_snh_DebtInstrumentMaximumBorrowingCapacityOptionToIncrease_4BA1984BFB156C12D97097EB1817C7A6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_snh_DebtInstrumentMaximumBorrowingCapacityOptionToIncrease_4BA1984BFB156C12D97097EB1817C7A6" xlink:to="lab_snh_DebtInstrumentMaximumBorrowingCapacityOptionToIncrease_4BA1984BFB156C12D97097EB1817C7A6" xlink:type="arc" />
    <link:label id="lab_us-gaap_ExtinguishmentOfDebtAmount_8BD2330418033A10011297EB18173164_terseLabel_en-US" xlink:label="lab_us-gaap_ExtinguishmentOfDebtAmount_8BD2330418033A10011297EB18173164" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Principal amount plus accrued and unpaid interest</link:label>
    <link:label id="lab_us-gaap_ExtinguishmentOfDebtAmount_8BD2330418033A10011297EB18173164_label_en-US" xlink:label="lab_us-gaap_ExtinguishmentOfDebtAmount_8BD2330418033A10011297EB18173164" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Extinguishment of Debt, Amount</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ExtinguishmentOfDebtAmount" xlink:label="loc_us-gaap_ExtinguishmentOfDebtAmount_8BD2330418033A10011297EB18173164" xlink:type="locator" />
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    <link:label id="lab_snh_ExtinguishmentOfDebtAccruedAndInterestPayable_AF468AAEDE83CDDFA9EC97F27E24FB48_terseLabel_en-US" xlink:label="lab_snh_ExtinguishmentOfDebtAccruedAndInterestPayable_AF468AAEDE83CDDFA9EC97F27E24FB48" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Extinguishment of debt, accrued and interest payable</link:label>
    <link:label id="lab_snh_ExtinguishmentOfDebtAccruedAndInterestPayable_AF468AAEDE83CDDFA9EC97F27E24FB48_label_en-US" xlink:label="lab_snh_ExtinguishmentOfDebtAccruedAndInterestPayable_AF468AAEDE83CDDFA9EC97F27E24FB48" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Extinguishment Of Debt, Accrued And Interest Payable</link:label>
    <link:label id="lab_snh_ExtinguishmentOfDebtAccruedAndInterestPayable_AF468AAEDE83CDDFA9EC97F27E24FB48_documentation_en-US" xlink:label="lab_snh_ExtinguishmentOfDebtAccruedAndInterestPayable_AF468AAEDE83CDDFA9EC97F27E24FB48" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Extinguishment Of Debt, Accrued And Interest Payable</link:label>
    <link:loc xlink:href="snh-20190331.xsd#snh_ExtinguishmentOfDebtAccruedAndInterestPayable" xlink:label="loc_snh_ExtinguishmentOfDebtAccruedAndInterestPayable_AF468AAEDE83CDDFA9EC97F27E24FB48" xlink:type="locator" />
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    <link:label id="lab_us-gaap_SegmentDomain_B8EF933FFC3799232A4497EB17AA2956_label_en-US" xlink:label="lab_us-gaap_SegmentDomain_B8EF933FFC3799232A4497EB17AA2956" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Segments [Domain]</link:label>
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    <link:label id="lab_snh_ManagedSeniorLivingCommunitiesMember_97948463D08116CF022297EB17ABA8EC_documentation_en-US" xlink:label="lab_snh_ManagedSeniorLivingCommunitiesMember_97948463D08116CF022297EB17ABA8EC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information pertaining to managed senior living communities under TRS structure that provide short term and long term residential care.</link:label>
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    <link:label id="lab_us-gaap_AllOtherSegmentsMember_D18E6DD35DF4BCAA51FE97EB17ABEBC8_terseLabel_en-US" xlink:label="lab_us-gaap_AllOtherSegmentsMember_D18E6DD35DF4BCAA51FE97EB17ABEBC8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">All Other Operations</link:label>
    <link:label id="lab_us-gaap_AllOtherSegmentsMember_D18E6DD35DF4BCAA51FE97EB17ABEBC8_label_en-US" xlink:label="lab_us-gaap_AllOtherSegmentsMember_D18E6DD35DF4BCAA51FE97EB17ABEBC8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Segments [Member]</link:label>
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    <link:label id="lab_us-gaap_OtherNoncashIncomeExpense_3F5569C29D386AD07F4597EB186A0DF5_label_en-US" xlink:label="lab_us-gaap_OtherNoncashIncomeExpense_3F5569C29D386AD07F4597EB186A0DF5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Noncash Income (Expense)</link:label>
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    <link:label id="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_5D553F564D73880C0D0897EB186E15C6_label_en-US" xlink:label="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_5D553F564D73880C0D0897EB186E15C6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_5D553F564D73880C0D0897EB186E15C6" xlink:to="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_5D553F564D73880C0D0897EB186E15C6" xlink:type="arc" />
    <link:label id="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_9F2920C5DC95382C783197EB186E0200_periodStartLabel_en-US" xlink:label="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_9F2920C5DC95382C783197EB186E0200" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Cash and cash equivalents and restricted cash at beginning of period</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_9F2920C5DC95382C783197EB186E0200" xlink:to="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_9F2920C5DC95382C783197EB186E0200" xlink:type="arc" />
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_A4BF1F96A3320AE9AF8897EB186E25AC" xlink:to="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_A4BF1F96A3320AE9AF8897EB186E25AC" xlink:type="arc" />
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    <link:label id="lab_us-gaap_SupplementalCashFlowInformationAbstract_98695579134D6F686A0797EB186EEC32_label_en-US" xlink:label="lab_us-gaap_SupplementalCashFlowInformationAbstract_98695579134D6F686A0797EB186EEC32" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Supplemental Cash Flow Information [Abstract]</link:label>
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    <link:label id="lab_us-gaap_InterestPaidNet_615A2EF36F4BE51AF30597EB186F8DA6_terseLabel_en-US" xlink:label="lab_us-gaap_InterestPaidNet_615A2EF36F4BE51AF30597EB186F8DA6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Interest paid</link:label>
    <link:label id="lab_us-gaap_InterestPaidNet_615A2EF36F4BE51AF30597EB186F8DA6_label_en-US" xlink:label="lab_us-gaap_InterestPaidNet_615A2EF36F4BE51AF30597EB186F8DA6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest Paid, Excluding Capitalized Interest, Operating Activities</link:label>
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    <link:label id="lab_us-gaap_IncomeTaxesPaid_F8B517F553961B212E6897EB186F57D1_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxesPaid_F8B517F553961B212E6897EB186F57D1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Income taxes paid</link:label>
    <link:label id="lab_us-gaap_IncomeTaxesPaid_F8B517F553961B212E6897EB186F57D1_label_en-US" xlink:label="lab_us-gaap_IncomeTaxesPaid_F8B517F553961B212E6897EB186F57D1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Taxes Paid</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncomeTaxesPaid" xlink:label="loc_us-gaap_IncomeTaxesPaid_F8B517F553961B212E6897EB186F57D1" xlink:type="locator" />
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    <link:label id="lab_snh_NoncashInvestingActivitiesAbstract_A2097ABEED0641EE154997EB186F3147_terseLabel_en-US" xlink:label="lab_snh_NoncashInvestingActivitiesAbstract_A2097ABEED0641EE154997EB186F3147" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Non-cash investing activities:</link:label>
    <link:label id="lab_snh_NoncashInvestingActivitiesAbstract_A2097ABEED0641EE154997EB186F3147_label_en-US" xlink:label="lab_snh_NoncashInvestingActivitiesAbstract_A2097ABEED0641EE154997EB186F3147" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Noncash Investing Activities [Abstract]</link:label>
    <link:label id="lab_snh_NoncashInvestingActivitiesAbstract_A2097ABEED0641EE154997EB186F3147_documentation_en-US" xlink:label="lab_snh_NoncashInvestingActivitiesAbstract_A2097ABEED0641EE154997EB186F3147" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the information pertaining to the Non cash investing activities.</link:label>
    <link:loc xlink:href="snh-20190331.xsd#snh_NoncashInvestingActivitiesAbstract" xlink:label="loc_snh_NoncashInvestingActivitiesAbstract_A2097ABEED0641EE154997EB186F3147" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_snh_NoncashInvestingActivitiesAbstract_A2097ABEED0641EE154997EB186F3147" xlink:to="lab_snh_NoncashInvestingActivitiesAbstract_A2097ABEED0641EE154997EB186F3147" xlink:type="arc" />
    <link:label id="lab_us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1_DB5810649DE589BFF02497EB186FA7CF_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1_DB5810649DE589BFF02497EB186FA7CF" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Acquisitions funded by assumed debt</link:label>
    <link:label id="lab_us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1_DB5810649DE589BFF02497EB186FA7CF_label_en-US" xlink:label="lab_us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1_DB5810649DE589BFF02497EB186FA7CF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Noncash or Part Noncash Acquisition, Debt Assumed</link:label>
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    <link:label id="lab_snh_NoncashFinancingActivitiesAbstract_5FF0F203ED92DF83C19E97EB186F4393_terseLabel_en-US" xlink:label="lab_snh_NoncashFinancingActivitiesAbstract_5FF0F203ED92DF83C19E97EB186F4393" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Non-cash financing activities:</link:label>
    <link:label id="lab_snh_NoncashFinancingActivitiesAbstract_5FF0F203ED92DF83C19E97EB186F4393_label_en-US" xlink:label="lab_snh_NoncashFinancingActivitiesAbstract_5FF0F203ED92DF83C19E97EB186F4393" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Noncash Financing Activities [Abstract]</link:label>
    <link:label id="lab_snh_NoncashFinancingActivitiesAbstract_5FF0F203ED92DF83C19E97EB186F4393_documentation_en-US" xlink:label="lab_snh_NoncashFinancingActivitiesAbstract_5FF0F203ED92DF83C19E97EB186F4393" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information pertaining to the non cash financial activities.</link:label>
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    <link:label id="lab_us-gaap_LiabilitiesAssumed1_F72A4770687404D288B197EB18704D05_terseLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesAssumed1_F72A4770687404D288B197EB18704D05" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Assumption of mortgage notes payable</link:label>
    <link:label id="lab_us-gaap_LiabilitiesAssumed1_F72A4770687404D288B197EB18704D05_label_en-US" xlink:label="lab_us-gaap_LiabilitiesAssumed1_F72A4770687404D288B197EB18704D05" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Liabilities Assumed</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LiabilitiesAssumed1" xlink:label="loc_us-gaap_LiabilitiesAssumed1_F72A4770687404D288B197EB18704D05" xlink:type="locator" />
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    <link:label id="lab_us-gaap_AssetsAbstract_F57C56B2C1217C24774D9D576C3AF36B_terseLabel_en-US" xlink:label="lab_us-gaap_AssetsAbstract_F57C56B2C1217C24774D9D576C3AF36B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">ASSETS</link:label>
    <link:label id="lab_us-gaap_AssetsAbstract_F57C56B2C1217C24774D9D576C3AF36B_label_en-US" xlink:label="lab_us-gaap_AssetsAbstract_F57C56B2C1217C24774D9D576C3AF36B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Assets [Abstract]</link:label>
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    <link:label id="lab_us-gaap_RealEstateInvestmentPropertyNetAbstract_E70CD18AD4FB3B9B66F29D576C3C9435_terseLabel_en-US" xlink:label="lab_us-gaap_RealEstateInvestmentPropertyNetAbstract_E70CD18AD4FB3B9B66F29D576C3C9435" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Real estate properties:</link:label>
    <link:label id="lab_us-gaap_RealEstateInvestmentPropertyNetAbstract_E70CD18AD4FB3B9B66F29D576C3C9435_label_en-US" xlink:label="lab_us-gaap_RealEstateInvestmentPropertyNetAbstract_E70CD18AD4FB3B9B66F29D576C3C9435" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Real Estate Investment Property, Net [Abstract]</link:label>
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    <link:label id="lab_us-gaap_BuildingsAndImprovementsGross_F6F550AEFA5384F924189D576C3D5C86_label_en-US" xlink:label="lab_us-gaap_BuildingsAndImprovementsGross_F6F550AEFA5384F924189D576C3D5C86" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Buildings and Improvements, Gross</link:label>
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