XML 98 R44.htm IDEA: XBRL DOCUMENT
v3.23.3

Consolidated and unconsolidated real estate joint ventures (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2023 USD ($) ft² | Jun. 30, 2023 USD ($) ft² | Mar. 31, 2023 USD ($) ft² | Sep. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) ft² | Sep. 30, 2022 USD ($) | Oct. 23, 2023 | Apr. 11, 2023
Schedule of Equity Method Investments |  |  |  |  |  |  |  |
Area of real estate property | ft² | 75,100,000 |  |  |  | 75,100,000 |  |  |
Proceeds from Noncontrolling Interests |  |  |  |  | $ 436,207 | $ 1,463,454 |  |
Contributions from and sales of noncontrolling interests | $ 136,726 |  |  | $ 450,913 | 431,393 | 1,479,520 |  |
Payments to acquire real estate |  |  |  |  | 257,333 | 2,499,772 |  |
Contribution of assets from real estate joint venture partner |  |  |  |  | $ 33,250 | 19,146 |  |
Future Development |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |
Area of real estate property | ft² | 0 | 374,349 | 715,000 |  | 0 |  |  |
Noncontrolling Interests |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |
Contributions from and sales of noncontrolling interests | $ 130,271 |  |  | 324,957 | $ 400,993 | 826,929 |  |
Redeemable Noncontrolling Interests |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |
Contributions from and sales of noncontrolling interests | 0 |  |  | 0 | 35,250 | 0 |  |
Additional Paid-In Capital |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |
Contributions from and sales of noncontrolling interests | $ 6,455 |  |  | $ 125,956 | $ 30,400 | $ 652,591 |  |
1655 and 1725 Third Street |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage | 10.00% |  |  |  | 10.00% |  |  |
1401/1413 Research Boulevard |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage | 65.00% |  |  |  | 65.00% |  |  |
1450 Research Boulevard |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage | 73.20% |  |  |  | 73.20% |  |  |
101 West Dickman Street |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage | 57.90% |  |  |  | 57.90% |  |  |
50 and 60 Binney Street | Alexandria |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 34.00% |  |  |  | 34.00% |  |  |
75/125 Binney Street | Alexandria |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 40.00% |  |  |  | 40.00% |  |  |
100 and 225 Binney Street and 300 Third Street | Alexandria |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 30.00% |  |  |  | 30.00% |  |  |
99 Coolidge Avenue | Alexandria |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 75.00% |  |  |  | 75.00% |  |  |
15 Necco Street |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |
Area of real estate property | ft² |  | 345,995 |  |  |  |  |  |
Proceeds from Noncontrolling Interests |  | $ 66,108 |  |  |  |  |  |
15 Necco Street | Additional Paid-In Capital |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |
Contributions from and sales of noncontrolling interests |  | $ (7,761) |  |  |  |  |  |
15 Necco Street | Alexandria |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 60.30% |  | 90.00% |  | 60.30% |  |  | 72.00%
15 Necco Street | Alexandria | Forecast |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  |  |  |  |  | 57.00% |
15 Necco Street | Alexandria | Noncontrolling Interests |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |
Ownership percentage by noncontrolling owners |  |  | 10.00% |  |  |  |  |
Real Estate Property, Ownership Interest Sold |  | 18.00% |  |  |  |  |  |
15 Necco Street | Alexandria | Noncontrolling Interests | Existing Partner |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |
Ownership percentage by noncontrolling owners |  |  |  |  |  |  |  | 8.00%
Real Estate Property, Ownership Interest Sold by Noncontrolling Interests |  | 2.00% |  |  |  |  |  |
15 Necco Street | Alexandria | Noncontrolling Interests | New Partner |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |
Real Estate Properties, Ownership Interest Acquired by Noncontrolling Interest |  | 20.00% |  |  |  |  |  |
15 Necco Street | Alexandria | Noncontrolling Interests | New Partner | Minimum |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |
Ownership percentage by noncontrolling owners |  |  |  |  |  |  |  | 20.00%
15 Necco Street | Alexandria | Noncontrolling Interests | New Partner | Maximum |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |
Ownership percentage by noncontrolling owners |  | 37.00% |  |  |  |  |  |
Other joint venture |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |
Payments to acquire real estate |  |  | $ 58,900 |  |  |  |  |
Total Value of Assets Acquired |  |  | 37,600 |  |  |  |  |
Contribution of assets from real estate joint venture partner |  |  | $ 33,300 |  |  |  |  |
Other joint venture | Future Development |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |
Area of real estate property | ft² |  |  | 715,000 |  |  |  |  |
Other joint venture | Development Entitlements Acquired |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |
Area of real estate property | ft² |  |  | 515,000 |  |  |  |  |
Other joint venture | Redeemable Noncontrolling Interests |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |
Contributions from and sales of noncontrolling interests |  |  | $ 35,300 |  |  |  |  |
Other joint venture | Alexandria |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 61.00% |  |  |  | 61.00% |  |  |
Other joint venture | Alexandria | Noncontrolling Interests |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |
Ownership percentage by noncontrolling owners | 39.00% |  |  |  | 39.00% |  |  |
Alexandria Center for Science and Technology - Mission Bay | Alexandria |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 25.00% |  |  |  | 25.00% |  |  |
1450 Owens Street | Alexandria |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 42.80% |  |  |  | 42.80% |  |  |
1450 Owens Street | Alexandria | Noncontrolling Interests |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |
Ownership percentage by noncontrolling owners | 75.00% |  |  |  | 75.00% |  |  |
601, 611, 651, 681, 685, and 701 Gateway Boulevard | Alexandria |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 50.00% |  |  |  | 50.00% |  |  |
751 Gateway Boulevard | Alexandria |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 51.00% |  |  |  | 51.00% |  |  |
211 and 213 East Grand Avenue | Alexandria |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 30.00% |  |  |  | 30.00% |  |  |
500 Forbes Boulevard | Alexandria |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 10.00% |  |  |  | 10.00% |  |  |
Alexandria Center® for Life Science – Millbrae | Alexandria |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 46.70% |  |  |  | 46.70% |  |  |
3215 Merryfield Row | Alexandria |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 30.00% |  |  |  | 30.00% |  |  |
Campus Point by Alexandria | Alexandria |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 55.00% |  |  |  | 55.00% |  |  |
5200 Illumina Way | Alexandria |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 51.00% |  |  |  | 51.00% |  |  |
9625 Towne Centre Drive |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |
Area of real estate property | ft² |  | 163,648 |  |  |  |  |  |
Proceeds from Noncontrolling Interests |  | $ 32,261 |  |  |  |  |  |
Noncontrolling Interest, Consideration Transferred |  | 160,500 |  |  |  |  |  |
9625 Towne Centre Drive | Additional Paid-In Capital |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |
Contributions from and sales of noncontrolling interests |  | $ 15,553 |  |  |  |  |  |
9625 Towne Centre Drive | Alexandria |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 30.00% |  | 50.10% |  | 30.00% |  |  |
9625 Towne Centre Drive | Alexandria | Noncontrolling Interests |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |
Ownership percentage by noncontrolling owners |  |  | 49.90% |  |  |  |  |
Real Estate Property, Ownership Interest Sold |  | 20.10% |  |  |  |  |  |
9625 Towne Centre Drive | Alexandria | Noncontrolling Interests | Previous Partner |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |
Real Estate Property, Ownership Interest Sold by Noncontrolling Interests |  | 49.90% |  |  |  |  |  |
9625 Towne Centre Drive | Alexandria | Noncontrolling Interests | New Partner |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |
Ownership percentage by noncontrolling owners |  | 70.00% |  |  |  |  |  |
SD Tech by Alexandria | Alexandria |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 50.00% |  |  |  | 50.00% |  |  |
Pacific Technology Park | Alexandria |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 50.00% |  |  |  | 50.00% |  |  |
Summers Ridge Science Park | Alexandria |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 30.00% |  |  |  | 30.00% |  |  |
1201 and 1208 Eastlake Avenue East and 199 East Blaine Street | Alexandria |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 30.00% |  |  |  | 30.00% |  |  |
400 Dexter Avenue North | Alexandria |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 30.00% |  |  |  | 30.00% |  |  |
800 Mercer Street | Alexandria |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 60.00% |  |  |  | 60.00% |  |  |

X
- Definition Noncontrolling Interest, Consideration Transferred + References No definition available. + Details
Name: | are_NoncontrollingInterestConsiderationTransferred
Namespace Prefix: | are_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Real Estate Properties, Ownership Interest Acquired by Noncontrolling Interest + References No definition available. + Details
Name: | are_RealEstatePropertiesOwnershipInterestAcquiredByNoncontrollingInterest
Namespace Prefix: | are_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Real Estate Property, Ownership Interest Sold + References No definition available. + Details
Name: | are_RealEstatePropertyOwnershipInterestSold
Namespace Prefix: | are_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Real Estate Property, Ownership Interest Sold by Noncontrolling Interests + References No definition available. + Details
Name: | are_RealEstatePropertyOwnershipInterestSoldByNoncontrollingInterests
Namespace Prefix: | are_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Temporary equity, contribution from noncontrolling interests + References No definition available. + Details
Name: | are_Temporaryequitycontributionfromnoncontrollinginterests
Namespace Prefix: | are_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Total Value of Assets Acquired + References No definition available. + Details
Name: | are_TotalValueOfAssetsAcquired
Namespace Prefix: | are_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Area of a real estate property. + References No definition available. + Details
Name: | us-gaap_AreaOfRealEstateProperty
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481687/323-10-50-3 + Details
Name: | us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity. + References No definition available. + Details
Name: | us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The parent entity's interest in net assets of the subsidiary, expressed as a percentage. + References No definition available. + Details
Name: | us-gaap_MinorityInterestOwnershipPercentageByParent
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The value of an asset or business acquired in a noncash (or part noncash) acquisition. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482913/230-10-50-4 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482913/230-10-50-3 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482913/230-10-50-5 + Details
Name: | us-gaap_NoncashOrPartNoncashAcquisitionValueOfAssetsAcquired1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of increase in noncontrolling interest from sale of a portion of the parent's controlling interest. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 810 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 23 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481231/810-10-45-23 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480008/505-10-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1A -Subparagraph (c)(2) -SubTopic 10 -Topic 810 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481203/810-10-50-1A + Details
Name: | us-gaap_NoncontrollingInterestIncreaseFromSaleOfParentEquityInterest
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 13 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-13 + Details
Name: | us-gaap_PaymentsToAcquireRealEstate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of cash inflow from a noncontrolling interest. Includes, but is not limited to, purchase of additional shares or other increase in noncontrolling interest ownership. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-14 + Details
Name: | us-gaap_ProceedsFromMinorityShareholders
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(g)(1)(ii)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481687/323-10-50-3 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 28 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482907/825-10-50-28 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481687/323-10-50-3 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481687/323-10-50-3 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481687/323-10-50-3 + Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | are_PropertyTypeAxis=are_FuturedevelopmentprojectsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_NoncontrollingInterestMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=are_RedeemableNoncontrollingInterestsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_AdditionalPaidInCapitalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=are_A1655and1715ThirdStreetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=are_A14011413ResearchBoulevardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=are_A1450ResearchBoulevardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=are_A101WestDickmanStreetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=are_A50And60BinneyStreetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_OwnershipAxis=are_AlexandriaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=are_A75125BinneyStreetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=are_A100And225BinneyStreetAnd300ThirdStreetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=are_A99CoolidgeAvenueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=are_A15NeccoStreetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CounterpartyNameAxis=are_ExistingPartnerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CounterpartyNameAxis=are_NewPartnerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=are_OtherGreaterBostonMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | are_PropertyTypeAxis=are_DevelopmentEntitlementsAcquiredMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=are_AlexandriaCenterForScienceAndTechnologyMissionBayMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=are_A1450OwensStreetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=are_A601611651681685And701GatewayBoulevardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=are_A751GatewayBoulevardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=are_A213EastGrandAvenueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=are_A500ForbesBoulevardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=are_AlexandriaCenterForLifeScienceMillbraeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=are_A3215MerryfieldRowMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=are_CampusPointByAlexandriaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=are_A5200IlluminaWayMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=are_A9625TowneCentreDriveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CounterpartyNameAxis=are_PreviousPartnerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=are_SDTechbyAlexandriaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=are_PacificTechnologyParkMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=are_SummersRidgeScienceParkMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=are_A1201And1208EastlakeAvenueEastAnd199EastBlaineStreetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=are_A400DexterAvenueNorthMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=are_A800MercerStreetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |