Alexandria Real Estate Equities (ARE) 10-Q 4 Nov 14 2014 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 30, 2014	Oct. 17, 2014
Document and Entity Information	'	'
Entity Registrant Name	'ALEXANDRIA REAL ESTATE EQUITIES INC.	'
Entity Central Index Key	'0001035443	'
Document Type	'10-Q	'
Document Period End Date	30-Sep-14	'
Amendment Flag	'false	'
Current Fiscal Year End Date	'--12-31	'
Entity Current Reporting Status	'Yes	'
Entity Filer Category	'Large Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	72,007,833
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q3	'

Consolidated_Balance_Sheets_Un

Consolidated Balance Sheets (Unaudited) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Assets	'	'
Investments in real estate, net	$7,197,630	$6,776,914
Cash and cash equivalents	67,023	57,696
Restricted cash	24,245	27,709
Tenant receivables	10,830	9,918
Deferred rent	225,506	190,425
Deferred leasing and financing costs, net	199,835	192,658
Marketable Securities	177,577	140,288
Other assets	117,668	134,156
Total assets	8,020,314	7,529,764
Liabilities, Noncontrolling Interests, and Equity	'	'
Secured notes payable	636,825	708,831
Unsecured senior notes payable	1,747,290	1,048,230
Unsecured senior line of credit	142,000	204,000
Loans Payable to Bank	975,000	1,100,000
Accounts Payable and Accrued Liabilities	504,535	435,342
Dividends payable	57,549	54,420
Total liabilities	4,063,199	3,550,823
Commitments and contingencies	'	'
Redeemable noncontrolling interests	14,348	14,444
Alexandria Real Estate Equities, Inc.’s stockholders’ equity:	'	'
Series D cumulative convertible preferred stock	250,000	250,000
Series E cumulative redeemable preferred stock	130,000	130,000
Common stock	714	712
Additional paid-in capital	3,523,195	3,572,281
Accumulated other comprehensive loss	-28,711	-36,204
Alexandria’s stockholders’ equity	3,875,198	3,916,789
Noncontrolling interests	67,569	47,708
Total equity	3,942,767	3,964,497
Total liabilities, noncontrolling interests, and equity	$8,020,314	$7,529,764

Consolidated_Statements_of_Inc

Consolidated Statements of Income (Unaudited) (USD $)	3 Months Ended				9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Revenues:	'		'		'		'
Rental	$137,718		$116,052		$403,280		$342,071
Tenant recoveries	45,572		38,691		128,198		110,125
Other Income	2,325		3,572		6,725		10,132
Total revenues	185,615		158,315		538,203		462,328
Expenses:	'		'		'		'
Rental operations	57,423		47,684		162,283		139,147
General and administrative	12,609		11,666		39,669		35,769
Interest	20,555		16,171		57,111		50,169
Depreciation and amortization	58,388		48,866		166,123		141,039
Gains (Losses) on Extinguishment of Debt	525		1,432		525		1,992
Total expenses	149,500		125,819		425,711		368,116
Income from continuing operations	36,115		32,496		112,492		94,212
Income from discontinued operations:	'		'		'		'
(Loss) income from discontinued operations	-180	[1]	-43	[1]	-489	[1]	1,043	[1]
Gain (Loss) on Sale of Properties, Net of Applicable Income Taxes	8		0		805		772
Net income	35,943		32,453		112,808		96,027
Dividends on preferred stock	-6,471		-6,472		-19,414		-19,414
Net income attributable to noncontrolling interests	-1,340		-960		-3,842		-2,922
Participating Securities, Distributed and Undistributed Earnings (Loss), Diluted	-506		-442		-1,285		-1,187
Net Income (Loss) Available to Common Stockholders, Basic	$27,626		$24,579		$88,267		$72,504
Earnings per share attributable to Alexandria’s common stockholders – basic and diluted:	'		'		'		'
Continuing operations	$0.39		$0.35		$1.25		$1.06
Discontinued operations	$0		$0		($0.01)		$0.02
Earnings per share – basic and diluted	$0.39		$0.35		$1.24		$1.08
Common Stock, Dividends, Per Share, Declared	$0.72		$0.68		$2.14		$1.93
[1]	includes the results of operations of four properties that were classified as “held for sale” as of September 30, 2014, as well as the results of operations (prior to disposition) and gain on sale of real estate attributable to seven properties sold during the period from January 1, 2013, to September 30, 2014. In October 2014, we completed the sale of one property which was classified as “held for sale” as of September 30, 2014.

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (Unaudited) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Statement of Comprehensive Income [Abstract]	'	'	'	'
Net income	$35,943	$32,453	$112,808	$96,027
Unrealized (losses) gains on marketable securities:	'	'	'	'
Unrealized holding (losses) gains arising during the period	-2,454	-37	13,591	323
Reclassification adjustment for losses (gains) included in net income	111	-250	517	-480
Unrealized (losses) gains on marketable securities, net	-2,343	-287	14,108	-157
Unrealized (losses) gains on interest rate swap agreements:	'	'	'	'
Unrealized interest rate swap (losses) gains arising during the period	1,206	-676	-2,708	-704
Reclassification adjustment for amortization of interest expense included in net income	1,129	3,904	5,742	12,046
Unrealized gains on interest rate swap agreements, net	2,335	3,228	3,034	11,342
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	-12,259	-3,404	-9,450	-26,461
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax	-199	0	-199	0
Foreign currency translation gains (losses)	-12,458	-3,404	-9,649	-26,461
Total other comprehensive income (loss)	-12,466	-463	7,493	-15,276
Comprehensive income	23,477	31,990	120,301	80,751
Less: comprehensive income attributable to noncontrolling interests	-1,340	-933	-3,842	-2,839
Comprehensive income attributable to Alexandria’s common stockholders	$22,137	$31,057	$116,459	$77,912

Consolidated_Statement_of_Chan

Consolidated Statement of Changes in Stockholders' Equity and Noncontrolling Interests (Unaudited) (USD $)	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Noncontrolling Interests	Redeemable Noncontrolling Interests	Series D Preferred Stock	Series D Preferred Stock	Series E Cumulative Redeemable Preferred Stock	Series E Cumulative Redeemable Preferred Stock
In Thousands, except Share data, unless otherwise specified									Preferred Stock		Preferred Stock
Beginning balance at Dec. 31, 2013	$14,444	'	'	'	'	'	$14,444	'	'	'	'
Beginning balance at Dec. 31, 2013	3,964,497	712	3,572,281	0	-36,204	47,708	'	'	250,000	'	130,000
Beginning balance, common shares at Dec. 31, 2013	'	71,172,197	'	'	'	'	'	'	'	'	'
Increase (Decrease) in Stockholders' Equity	'	'	'	'	'	'	'	'	'	'	'
Net Income	112,011	'	'	108,966	'	3,045	'	'	'	'	'
Total other comprehensive income (loss)	7,493	'	'	'	7,493	0	'	'	'	'	'
Noncontrolling Interest, Increase from Subsidiary Equity Issuance	19,410	'	'	'	'	19,410	'	'	'	'	'
Distributions to noncontrolling interests	-2,594	'	'	'	'	-2,594	'	'	'	'	'
Issuances pursuant to stock plan (in shares)	'	199,628	'	'	'	'	'	'	'	'	'
Issuances pursuant to stock plan	15,033	2	15,031	'	'	'	'	'	'	'	'
Dividends declared on common stock	-153,669	'	'	-153,669	'	'	'	'	'	'	'
Dividends declared on preferred stock	-19,414	'	'	-19,414	'	'	'	'	'	'	'
Distributions in excess of earnings	'	'	-64,117	64,117	'	'	'	'	'	'	'
Increase (Decrease) in Temporary Equity [Roll Forward]	'	'	'	'	'	'	'	'	'	'	'
Net Income	'	'	'	'	'	'	797	'	'	'	'
Total other comprehensive income (loss)	'	'	'	'	'	'	0	'	'	'	'
Distributions to noncontrolling interests	'	'	'	'	'	'	-893	'	'	'	'
Ending balance at Sep. 30, 2014	14,348	'	'	'	'	'	14,348	'	'	'	'
Ending balance at Sep. 30, 2014	3,942,767	714	3,523,195	0	-28,711	67,569	'	'	250,000	'	130,000
Ending balance, common shares at Sep. 30, 2014	'	71,371,825	'	'	'	'	'	'	'	'	'
Beginning balance at Jun. 30, 2014	'	'	'	'	'	'	'	'	'	'	'
Increase (Decrease) in Stockholders' Equity	'	'	'	'	'	'	'	'	'	'	'
Total other comprehensive income (loss)	-12,466	'	'	'	'	'	'	'	'	'	'
Dividends declared on common stock	-51,800	'	'	'	'	'	'	'	'	'	'
Dividends declared on preferred stock	'	'	'	'	'	'	'	-4,400	'	-2,100	'
Ending balance at Sep. 30, 2014	14,348	'	'	'	'	'	'	'	'	'	'
Ending balance at Sep. 30, 2014	$3,942,767	'	'	'	'	'	'	'	$250,000	'	$130,000

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (Unaudited) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Operating Activities	'	'
Net income	$112,808	$96,027
Depreciation, Depletion and Amortization	166,123	142,677
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Gains (Losses) on Extinguishment of Debt	525	1,992
Gain (Loss) on Sale of Properties, Net of Applicable Income Taxes	-805	-772
Loss on sale of real estate	0	121
Amortization of loan fees and costs	8,090	7,300
Amortization of debt premiums/discounts	100	383
Amortization of above and below Market Leases	-2,191	-2,490
Deferred rent	-35,511	-20,007
Stock compensation expense	9,372	11,541
Investment gains	-9,481	-4,716
Investment losses	8,725	529
Changes in operating assets and liabilities:	'	'
Restricted cash	0	1,243
Tenant receivables	-939	-271
Deferred leasing costs	-25,910	-37,190
Other assets	-12,228	-11,428
Accounts payable, accrued expenses, and tenant security deposits	36,446	51,437
Net cash (used in) provided by operating activities	255,124	236,376
Investing Activities	'	'
Proceeds from sale of properties	28,378	101,815
Additions to properties	-345,074	-450,140
Purchase of properties	-97,785	-24,537
Payments for (Proceeds from) Deposits on Real Estate Acquisitions	7,292	0
Change in restricted cash related to construction projects	6,694	5,711
Contributions to unconsolidated real estate entity	-67,525	-13,881
Additions to investments	-35,484	-22,835
Proceeds from investments	13,883	12,750
Proceeds from Collection of Notes Receivable	29,866	0
Net cash (used in) provided by investing activities	-474,339	-391,117
Financing Activities	'	'
Borrowings from secured notes payable	108,626	26,319
Repayments of borrowings from secured notes payable	-228,909	-34,120
Proceeds from Issuance of Unsecured Debt	698,908	498,561
Principal borrowings from unsecured senior line of credit	890,000	319,000
Repayments of borrowings from unsecured senior line of credit	-952,000	-871,000
Repayments of Unsecured Debt	-125,000	-250,000
Repayments of Convertible Debt	0	-384
Change in restricted cash related to financings	375	923
Deferred financing costs paid	-7,989	-16,247
Proceeds from Issuance of Common Stock	0	535,686
Dividends paid on common stock	-150,540	-120,367
Dividends paid on preferred stock	-19,414	-19,414
Proceeds from Noncontrolling Interests	19,410	0
Distributions to noncontrolling interests	-2,594	-2,100
Payments of Distributions to Affiliates	-893	0
Net cash provided by (used in) financing activities	229,980	66,857
Effect of foreign exchange rate changes on cash and cash equivalents	-1,438	752
Net increase in cash and cash equivalents	9,327	-87,132
Cash and cash equivalents at beginning of period	57,696	140,971
Cash and cash equivalents at end of period	67,023	53,839
Supplemental Disclosure of Cash Flow Information	'	'
Cash paid during the period for interest, net of interest capitalized	33,783	34,281
Non-Cash Investing Activities	'	'
Note receivable from sale of real estate	0	38,820
Assumption of secured notes payable in connection with purchase of properties	($48,329)	$0

Background

Background	9 Months Ended
	Sep. 30, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Background	'
	Background
	As used in this quarterly report on Form 10-Q, references to the “Company,” “ARE,” “Alexandria,” “we,” “our,” and “us” refer to Alexandria Real Estate Equities, Inc. and its consolidated subsidiaries.
	Alexandria Real Estate Equities, Inc. (NYSE:ARE), with a total market capitalization of $9.1 billion as of September 30, 2014, and an asset base of 31.6 million square feet, including 18.5 million RSF of operating and current value-creation projects, as well as an additional 13.1 million square feet in future ground-up development projects, is the largest and leading REIT uniquely focused on Class A assets in collaborative science and technology campuses located in urban innovation clusters. Alexandria pioneered this niche in 1994 and has since established a dominant market presence in AAA locations including Greater Boston, the San Francisco Bay Area, New York City, San Diego, Seattle, Maryland, and Research Triangle Park. Alexandria is known for its high-quality and diverse client tenant base. Alexandria is the Landlord of Choice to the Life Science Industry®, and approximately 53% of its total ABR results from investment-grade client tenants. Alexandria has a longstanding and proven track record of developing Class A assets clustered in urban collaborative science and technology campuses that provide its client tenants with a highly collaborative, 24/7 live/work/play ecosystems, as well as the critical ability to successfully recruit and retain best-in-class talent. We believe these advantages result in higher occupancy levels, longer lease terms, higher rental income, higher returns, and greater long-term asset value. For additional information on Alexandria, please visit www.are.com.
	Our asset base consisted of the following, as of September 30, 2014:
			Square Feet
	Operating properties		16,373,416
	Development properties		1,941,186
	Redevelopment properties		143,777
	Total operating and current value-creation projects		18,458,379
	Near-term value-creation projects in North America (CIP)		1,926,331
	Future value-creation projects		10,983,108
	Land under sales contract		250,000
	Total		31,617,818
	Ÿ	Investment-grade client tenants represented approximately 53% of our total ABR;
	Ÿ	Approximately 95% of our leases (on an RSF basis) contained effective annual rent escalations that were either fixed (generally ranging from 3% to 3.5%) or indexed based on a consumer price index or other index;
	Ÿ	Approximately 95% of our leases (on an RSF basis) were triple net leases, requiring client tenants to pay substantially all real estate taxes, insurance, utilities, common area, and other operating expenses (including increases thereto) in addition to base rent, and;
	Ÿ	Approximately 93% of our leases (on an RSF basis) provided for the recapture of certain capital expenditures (such as HVAC systems maintenance and/or replacement, roof replacement, and parking lot resurfacing) that we believe would typically be borne by the landlord in traditional office leases.
	Any references to the number of buildings, square footage, number of leases, occupancy, and any amounts derived from these values in the notes to the consolidated financial statements are unaudited and outside the scope of our independent registered public accounting firm’s review of our interim consolidated financial statements in accordance with the standards of the Public Company Accounting Oversight Board.

Basis_of_presentation

Basis of presentation	9 Months Ended
	Sep. 30, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Basis of presentation	'
	Basis of presentation
	We have prepared the accompanying interim consolidated financial statements in accordance with GAAP and in conformity with the rules and regulations of the SEC.  In our opinion, the interim consolidated financial statements presented herein reflect all adjustments that are necessary to fairly present the interim consolidated financial statements.  The results of operations for the interim period are not necessarily indicative of the results that may be expected for the year ending December 31, 2014.  These consolidated financial statements should be read in conjunction with the consolidated financial statements and the notes thereto included in our annual report on Form 10-K for the year ended December 31, 2013.
	Consolidation
	The accompanying consolidated financial statements include the accounts of Alexandria Real Estate Equities, Inc. and its consolidated subsidiaries. All significant intercompany balances and transactions have been eliminated. In certain circumstances, we may enter into joint venture arrangements with outside partners. On a quarterly basis, we evaluate each JV arrangement under the VIE model and if the entity is determined not to be a VIE, then we evaluate the entity under the voting model to determine if the entity should be consolidated.
	Under the VIE model an entity is determined to be a VIE if it has any of the following characteristics:
	•	the entity does not have enough equity to finance its activities without additional subordinated financial support;
	•	the equity holders, as a group, lack the characteristics of a controlling financial interest, or
	•	the legal entity is established with non-substantive voting rights.
	If an entity is determined to be a VIE, we evaluate whether we are the primary beneficiary. We perform this evaluation on a quarterly basis. We use qualitative analyses when determining whether or not we are the primary beneficiary of a VIE. Factors considered include, but are not limited to, the purpose and design of the VIE, risks that the VIE was designed to create and pass through, the form of our ownership interest, our representation on the entity’s governing body, the size and seniority of our investment, our ability to participate in policy-making decisions, and the rights of the other investors to participate in the decision-making process and/or liquidate the venture, if applicable. We consolidate VIEs whenever we determine that we are the primary beneficiary.
	If an entity is determined not to be a VIE, we then evaluate such entity under the voting model. Under the voting model, if we are the general partner, managing member, or a similar role that can direct the operations of the entity, we have a presumption that we control the entity and we should consolidate regardless of our ownership percentage. If we determine that the other equity holders have any one of the following rights, it is assumed that we do not control the entity and therefore should not consolidate the entity: (i) the substantive ability to dissolve the entity or remove us from the lead role of the entity, or (ii) substantive rights that allow them to participate in the activities that most significantly impact the entity’s economic performance.
	As of September 30, 2014, we have two joint ventures that do not meet the requirements for consolidation and are accounted for under the equity method of accounting. See Note 3 – Investments in Real Estate, to our consolidated financial statements (unaudited) appearing elsewhere in this quarterly report on Form 10-Q for further information on our unconsolidated real estate entities.
	Reclassifications
	Certain prior period amounts have been reclassified to conform to the current period presentation for discontinued operations.
	Use of estimates
	The preparation of consolidated financial statements in conformity with GAAP requires us to make estimates and assumptions that affect the reported amounts of assets, liabilities, and equity; the disclosure of contingent assets and liabilities as of the date of the consolidated financial statements; and the amounts of revenues and expenses during the reporting period.  Actual results could materially differ from those estimates.
	Investments in real estate, net, and discontinued operations
	We recognize real estate acquired (including the intangible value of above or below market leases, acquired in-place leases, client tenant relationships, and other intangible assets or liabilities), liabilities assumed, and any noncontrolling interest in an acquired entity at their fair value as of the acquisition date.  If there is a bargain fixed-rate renewal option for the period beyond the non-cancelable lease term, we evaluate factors such as the business conditions in the industry in which the lessee operates, the economic conditions in the area in which the property is located, and the ability of the lessee to sublease the property during the renewal term, in order to determine the likelihood that the lessee will renew.  When we determine there is reasonable assurance that such bargain purchase option will be exercised, we consider its impact in determining the intangible value of such lease and its related amortization period.  The value of tangible assets acquired is based upon our estimation of value on an “as if vacant” basis.  The value of acquired in-place leases includes the estimated costs during the hypothetical lease-up period and other costs that would have been incurred in the execution of similar leases, considering market conditions at the acquisition date of the acquired in-place lease.  We assess the fair value of tangible and intangible assets based on numerous factors, including estimated cash flow projections that utilize appropriate discount and capitalization rates and available market information.  Estimates of future cash flows are based on a number of factors, including the historical operating results, known trends, and market/economic conditions that may affect the property.  We also recognize the fair values of assets acquired, the liabilities assumed, and any noncontrolling interest in acquisitions of less than a 100% interest when the acquisition constitutes a change in control of the acquired entity.  Costs related to the acquisition of businesses, including real estate acquired with in-place leases, are expensed as incurred.
	The values allocated to buildings and building improvements, land improvements, tenant improvements, and equipment are depreciated on a straight-line basis using the shorter of the term of the respective ground lease and up to 40 years for buildings and building improvements, an estimated life of 20 years for land improvements, the respective lease term for TIs, and the estimated useful life for equipment. The values of acquired above and below market leases are amortized over the lives of the related leases and recognized as either an increase (for below market leases) or a decrease (for above market leases) to rental income. The values of acquired in-place leases are classified in other assets in the accompanying consolidated balance sheets, and amortized over the remaining terms of the related leases.
	We are required to capitalize project costs, including predevelopment costs, interest, property taxes, insurance, and other costs directly related and essential to the acquisition, development, redevelopment, predevelopment, or construction of a project.  Capitalization of development, redevelopment, predevelopment, and construction costs is required while activities are ongoing to prepare an asset for its intended use.  Fluctuations in our development, redevelopment, predevelopment, and construction activities could result in significant changes to total expenses and net income.  Costs incurred after a project is substantially complete and ready for its intended use are expensed as incurred.  Should development, redevelopment, predevelopment, or construction activities cease, interest, property taxes, insurance, and certain other costs would no longer be eligible for capitalization and would be expensed as incurred.  Expenditures for repairs and maintenance are expensed as incurred.
	A property is classified as “held for sale” when all of the following criteria for a plan of sale have been met: (i) management, having the authority to approve the action, commits to a plan to sell the property; (ii) the property is available for immediate sale in its present condition, subject only to terms that are usual and customary; (iii) an active program to locate a buyer and other actions required to complete the plan to sell have been initiated; (iv) the sale of the property is probable (including the removal of significant contingencies or the fulfillment of significant conditions precedent to the sale) and is expected to be completed within one year; (v) the property is being actively marketed for sale at a price that is reasonable in relation to its current fair value; and (vi) actions necessary to complete the plan of sale indicate that it is unlikely that significant changes to the plan will be made or that the plan will be withdrawn.  When all of these criteria have been met, the property is classified as “held for sale,” and if (i) the operations and cash flows of the property have been or will be eliminated from the ongoing operations, and (ii) we will not have any significant continuing involvement in the operations of the property after the sale, then its operations, including any interest expense directly attributable to it, are classified as discontinued operations in our consolidated statements of income, and amounts for all prior periods presented are reclassified from continuing operations to discontinued operations.  Depreciation of assets ceases upon designation of a property as “held for sale.”
	Impairment of long-lived assets
	Long-lived assets to be held and used, including our rental properties, land held for development, CIP, and intangibles, are individually evaluated for impairment when conditions exist that may indicate that the amount of a long-lived asset may not be recoverable.  The amount of a long-lived asset to be held and used is not recoverable if it exceeds the sum of the undiscounted cash flows expected to result from the use and eventual disposition of the asset.  Impairment indicators or triggering events for long-lived assets to be held and used, including our rental properties, land held for development, and CIP, are assessed by project and include significant fluctuations in estimated NOI, occupancy changes, significant near-term lease expirations, current and historical operating and/or cash flow losses, construction costs, estimated completion dates, rental rates, and other market factors.  We assess the expected undiscounted cash flows based upon numerous factors, including, but not limited to, construction costs, available market information, current and historical operating results, known trends, current market/economic conditions that may affect the property, and our assumptions about the use of the asset, including, if necessary, a probability-weighted approach if multiple outcomes are under consideration.  Upon determination that an impairment has occurred, a write-down is recognized to reduce the carrying amount to its estimated fair value.  If an impairment loss is not required to be recognized, the recognition of depreciation is adjusted prospectively, as necessary, to reduce the carrying amount of the real estate to its estimated disposition value over the remaining period that the real estate is expected to be held and used.  We may adjust depreciation of properties that are expected to be disposed of or redeveloped prior to the end of their useful lives.
	We use the “held for sale” impairment model for our properties classified as held for sale.  The held for sale impairment model is different from the held and used impairment model.  Under the held for sale impairment model, an impairment loss is recognized if the amount of the long-lived asset classified as held for sale exceeds its fair value less cost to sell.  Because of these two different models, it is possible for a long-lived asset, previously classified to be held and used, to require the recognition of an impairment charge upon classification as held for sale.
	Investments
	We hold equity investments in certain publicly traded companies and investments in certain privately held entities primarily involved in the life science industry.  All of our investments in actively traded public companies are considered “available for sale” and are reflected in the accompanying consolidated balance sheets at fair value.  Fair value has been determined based upon the closing price as of each balance sheet date, with unrealized gains and losses shown as a separate component of comprehensive income.  The classification of each investment is determined at the time each investment is made, and such determination is reevaluated at each balance sheet date.  The cost of each investment sold is determined by the specific identification method, with realized gains or losses classified in other income in the accompanying consolidated statements of income.  Investments in privately held entities and limited partnerships are generally accounted for under the cost method when our interest in the entity is so minor that we have virtually no influence over the entity’s operating and financial policies.  Certain investments in privately held entities and limited partnerships are accounted for under the equity method when our interest in the entity is not deemed so minor that we have virtually no influence over the entity’s operating and financial policies.  Under the equity method of accounting, we recognize our investment initially at cost and adjust the amount of the investment to recognize our share of the earnings or losses of the investee subsequent to the date of our investment.  Additionally, we limit our ownership percentage in the voting interest of each individual entity to less than 10%.  As of September 30, 2014, and December 31, 2013, our ownership percentage in the voting interest of each individual entity was less than 10%.
	We monitor each of our investments throughout the year for new developments, including operating results, results of clinical trials, capital-raising events, and merger and acquisition activities. Individual investments are evaluated for impairment when changes in conditions may indicate an impairment exists.  The factors that we consider in making these assessments include, but are not limited to, market prices, market conditions, available financing, prospects for favorable or unfavorable clinical trial results, new product initiatives, and new collaborative agreements.  If there are no identified events or changes in circumstances that would have an adverse effect on our cost method investments, we do not estimate the investment’s fair value.  For all of our investments, if a decline in the fair value of an investment below the carrying value is determined to be other than temporary, such investment is written down to its estimated fair value with a charge to current earnings.
	Income taxes
	We are organized and qualify as a REIT pursuant to the Internal Revenue Code of 1986, as amended (the “Code”).  Under the Code, a REIT that distributes 100% of its REIT taxable income as a dividend to its shareholders each year and that meets certain other conditions is not subject to federal income taxes, but could be subject to certain state and local taxes.  We have distributed 100% or more of our taxable income.  Therefore, no provision for federal income taxes is required.  We file tax returns, including returns for our subsidiaries, with federal, state, and local jurisdictions, including jurisdictions located in the U.S., Canada, India, China, and other international locations.  Our tax returns are subject to examination in various jurisdictions for the calendar years 2009 through 2013.
	Recognition of rental income and tenant recoveries
	Rental income from leases is recognized on a straight-line basis over the respective lease terms.  We classify amounts currently recognized as income, and expected to be received in later years, as an asset in deferred rent in the accompanying consolidated balance sheets.  Amounts received currently, but recognized as income in future years, are classified in accounts payable, accrued expenses, and tenant security deposits in the accompanying consolidated balance sheets.  We commence recognition of rental income at the date the property is ready for its intended use and the client tenant takes possession of or controls the physical use of the property.
	Tenant recoveries related to reimbursement of real estate taxes, insurance, utilities, repairs and maintenance, and other operating expenses are recognized as revenue in the period during which the applicable expenses are incurred.
	Tenant receivables consist primarily of amounts due for contractual lease payments, reimbursements of common area maintenance expenses, property taxes, and other expenses recoverable from client tenants.  Tenant receivables are expected to be collected within one year.  We may maintain an allowance for estimated losses that may result from the inability of our client tenants to make payments required under the terms of the lease and for tenant recoveries due.  If a client tenant fails to make contractual payments beyond any allowance, we may recognize additional expense for uncollectible accounts in future periods equal to the amount of uncollectible rent and tenant recoveries, and deferred rent receivables arising from the straight-lining of rent.  As of September 30, 2014, and December 31, 2013, we had no allowance for uncollectible receivables.
	Monitoring client tenant credit quality
	During the term of each lease, we monitor the credit quality of our client tenants by (i) reviewing the credit rating of tenants that are rated by a nationally recognized credit rating agency, (ii) reviewing financial statements of the client tenants that are publicly available or that are required to be delivered to us pursuant to the applicable lease, (iii) monitoring news reports regarding our tenants and their respective businesses, (iv) monitoring the timeliness of lease payments, and (v) periodically meeting with our client tenants’ senior management. We have a team of employees who, among them, have graduate and undergraduate degrees in biology, chemistry, and industrial biotechnology and experience in the life science industry, as well as in finance. This research team is responsible for assessing and monitoring their credit quality and any material changes in credit quality.
	Interest and other income
	Interest and other income was $2.0 million and $1.2 million during the three months ended September 30, 2014 and 2013, respectively. Interest and other income was $3.8 million and $3.5 million during the nine months ended September 30, 2014 and 2013, respectively.  Interest and other income is included in other income in the accompanying consolidated statements of income.
	Impact of recently issued accounting standards
	In April 2014, the FASB issued an ASU on the reporting of discontinued operations which raises the threshold for disposals to qualify as discontinued operations. Under this ASU, a discontinued operation is (i) a component of an entity or group of components that has been disposed of by sale, that has been disposed of other than by sale, or that is classified as “held for sale” and represents a strategic shift that has had or will have a major effect on an entity’s operations and financial results or (ii) an acquired business or non-profit activity that is classified as “held for sale” on the date of the acquisition. A strategic shift that has or will have a major effect on an entity’s operations and financial results could include the disposal of (i) a major line of business, (ii) a major geographic area, (iii) a major equity method investment, or (iv) other major parts of an entity. Under current GAAP, an entity is prohibited from reporting a discontinued operation if it has certain continuing cash flows or involvement with the component after the disposal. This ASU eliminates these criteria and is effective for public companies during the interim and annual periods, beginning after December 15, 2014. We are required to adopt this ASU no later than January 1, 2015, and may early adopt this ASU during interim periods, as applicable. We expect the adoption of this ASU to result in fewer real estate sales qualifying for classification as discontinued operations in our consolidated financial statements.
	In May 2014, the FASB issued an ASU that replaces substantially all industry-specific revenue recognition requirements and converges areas under this topic with International Financial Reporting Standards. The ASU implements a five-step process for customer contract revenue recognition that focuses on transfer of control, as opposed to transfer of risk and rewards. The ASU also requires enhanced disclosures regarding the nature, amount, timing, and uncertainty of revenues and cash flows from contracts with customers. Other major provisions in this ASU include capitalizing and amortizing certain contract costs, ensuring the time value of money is considered in the applicable transaction price, and allowing estimates of variable consideration to be recognized before contingencies are resolved in certain circumstances. Entities can transition to the standard either retrospectively or as a cumulative-effect adjustment as of the date of adoption. The ASU is effective for reporting periods beginning after December 15, 2016, and early adoption is prohibited. The ASU does not apply to lease contracts accounted for under current GAAP. We are currently evaluating the impact of the adoption of this ASU will have on our financial position and results of operations.

Investments_in_real_estate_net

Investments in real estate, net	9 Months Ended
	Sep. 30, 2014
Real Estate [Abstract]	'
Investments in real estate, net	'
	Investments in real estate
	Our investments in real estate consisted of the following as of September 30, 2014, and December 31, 2013 (in thousands):
		30-Sep-14			31-Dec-13
	Rental properties	$	6,849,966		$	6,442,208
	CIP/current value-creation projects:
	Current development in North America	532,053			511,838
	Current redevelopment in North America	32,661			8,856
	Current development in Asia	35,602			60,928
		600,316			581,622
	Near-term value-creation projects in North America (CIP):
	50, 60, and 100 Binney Street	313,379			284,672
	Other projects	90,843			97,617
		404,222			382,289
	Future value-creation projects:
	North America	221,572			176,063
	Asia	78,319			77,251
		299,891			253,314
	Land under sales contract	12,236			22,943
	Near-term and future value-creation projects	716,349			658,546
	Gross investments in real estate	8,166,631			7,682,376
	Less: accumulated depreciation	(1,083,169		)	(952,106		)
	Equity method of accounting – unconsolidated JV	114,168			46,644
	Investments in real estate	$	7,197,630		$	6,776,914
	Acquisitions
	In January 2014, we acquired 3545 Cray Court, a 116,556 RSF laboratory/office property located in the Torrey Pines submarket of San Diego, for $64.0 million. The property was 100% occupied on the date of acquisition. In connection with the acquisition, we assumed a $40.7 million non-recourse secured note payable with a contractual interest rate of 4.66% and a maturity date in January 2023.
	In March 2014, we acquired 225 Second Avenue, a vacant 112,500 RSF office property located in the Route 128 submarket of Greater Boston, for $16.3 million. In May 2014, we leased 100% of the project to accommodate the expansion requirements of an existing tenant. The property is undergoing conversion into laboratory/office space through redevelopment.
	In March 2014, we acquired 4025/4031/4045 Sorrento Valley Boulevard, three adjacent buildings aggregating 42,566 RSF located in the Sorrento Valley submarket of San Diego, for a total purchase price of $12.4 million. These properties were 100% occupied on the date of acquisition. In connection with the acquisition, we assumed a $7.6 million non-recourse secured note payable with a contractual interest rate of 5.74% and a maturity date in April 2016.
	In April 2014, we acquired 510 Townsend Street, a land parcel supporting approximately 300,000 gross square feet, in SoMa for a purchase price of $50.0 million. We are in the process of perfecting entitlements and marketing for lease, and, subject to market conditions, we plan to commence construction as soon as possible in 2015.
	See discussion of the acquisition of 1455/1515 Third Street below under “Investments in Unconsolidated Real Estate Entities.”
	Current development and redevelopment projects
	As of September 30, 2014, we had seven ground-up development projects in process in North America aggregating 1,636,424 RSF, including two unconsolidated JV development projects. We also had two projects undergoing redevelopment in North America aggregating 143,777 RSF.
	Investments in unconsolidated real estate entities
	We account for investments in JVs described below under the equity method of accounting. See our consolidation policy described in Note 2 – Basis of Presentation.
	360 Longwood Avenue
	We are currently developing a building aggregating 413,536 RSF in the Longwood Medical Area of the Greater Boston market through an unconsolidated JV. The cost at completion for this unconsolidated JV real estate project is approximately $350.0 million. The project is currently 37% occupied by Dana-Farber Cancer Institute, Inc. and this space was placed into operations in late September 2014. The JV has a construction loan with commitments aggregating $213.2 million, with $143.5 million outstanding as of September 30, 2014. The remaining cost to complete the development is expected to be funded primarily from the remaining commitments of $69.7 million under the construction loan. The construction loan bears interest at LIBOR+3.75%, with a floor of 5.25%, and has a maturity date of April 1, 2019, inclusive of two separate options to extend the stated maturity date of April 1, 2017 by one year.
	We have a 27.5% interest in this unconsolidated JV that we account for under the equity method of accounting. Our investment under the equity method of accounting was $48.5 million as of September 30, 2014.
	1455/1515 Third Street
	In September 2014, Alexandria and Uber Technologies, Inc. (“Uber”) entered into a JV agreement and acquired two land parcels supporting 422,980 RSF at 1455/1515 Third Street in the Mission Bay submarket of the San Francisco Bay Area for a total purchase price of $125.0 million. We have a 51.0% interest and Uber has a 49% interest in this unconsolidated JV. We account for our investment in this JV under the equity method of accounting. Our investment under the equity method of accounting was $65.6 million as of September 30, 2014.
	This JV is currently developing two buildings aggregating 422,980 RSF. We are in the process of finalizing the design and construction budget with our partner and we expect to provide the total estimated cost at completion once we complete our planning in the near term. The project is 100% pre-leased to Uber on a 15-year lease.
	Land undergoing predevelopment activities (CIP)
	Land undergoing predevelopment activities is classified as CIP and is undergoing activities prior to commencement of construction of aboveground building improvements.  We generally will not commence ground-up development of any parcels undergoing predevelopment activities without first securing pre-leasing for such space, except when there is significant market demand.  If aboveground construction is not initiated at completion of predevelopment activities, the land parcel will be classified as land held for development.  Our objective with predevelopment is to reduce the time it takes to deliver projects to prospective client tenants.  Additionally, during predevelopment, we focus on the design of cost-effective buildings with generic and reusable infrastructure to accommodate single and multi-tenancy. As of September 30, 2014, we held land undergoing predevelopment activities in North America aggregating 1.9 million RSF. The largest project included in land undergoing predevelopment activities consists of substantially all of our 1.1 million square feet at ACKS located in East Cambridge, Massachusetts.
	Predevelopment costs generally include the following activities prior to commencement of vertical construction:
	Ÿ	Traditional predevelopment costs, including entitlement, design, construction drawings, BIM (3-D virtual modeling), budgeting, sustainability and energy optimization reviews, permitting, and planning for all aspects of the project; and
	Ÿ	Site and infrastructure construction costs, including belowground site work, utility connections, land grading, drainage, egress and regress access points, foundation, and other costs to prepare the site for construction of aboveground building improvements. For example, site and infrastructure costs for the 1.1 million RSF primarily related to 50, 60, and 100 Binney Street at ACKS are classified as predevelopment prior to commencement of vertical construction.
	Land held for development
	Land held for development represents real estate we plan to develop in the future, but for which, as of each period presented, no construction or predevelopment activities were ongoing. As a result, interest, property taxes, insurance, and other costs are expensed as incurred. As of September 30, 2014, we had land held for development in North America supporting an aggregate of 3.4 million RSF of ground-up development.
	Dispositions
	During the nine months ended September 30, 2014, we sold four land parcels for aggregate consideration of $29.4 million and recognized gains aggregating $805 thousand, which included a gain of $797 thousand on the sale of one parcel in the Seattle market, and a gain of $8 thousand on the sale of three parcels in non-cluster markets. These gains are classified in gain on sales of land parcels in the accompanying consolidated statements of income.

Investments

Investments	9 Months Ended
	Sep. 30, 2014
Investments [Abstract]	'
Investments	'
	Investments
	We hold investments in certain publicly traded companies and privately held entities, including limited partnerships, involved primarily in life science and related industries.  Our investments in publicly traded companies are accounted for as “available for sale” securities and are carried at their fair values.  Investments in “available for sale” securities with gross unrealized losses as of September 30, 2014, had been in a continuous unrealized loss position for less than 12 months. We have the ability and intent to hold these investments for a reasonable period of time sufficient for the recovery of our investment. We believe that these unrealized losses are temporary, and accordingly have not recognized other-than-temporary impairments related to “available for sale” securities as of September 30, 2014. As of September 30, 2014, and December 31, 2013, there were no unrealized losses in our investments in privately held entities, including limited partnerships.
	The following table summarizes our investments as of September 30, 2014, and December 31, 2013 (in thousands):
		30-Sep-14				31-Dec-13
	“Available-for-sale” marketable equity securities, cost basis	$	15,119			$	2,879
	Unrealized gains	17,150			(1)	2,177
	Unrealized losses	(1,452		)		(587		)
	“Available-for-sale” marketable equity securities, at fair value	30,817				4,469
	Investments accounted for under cost method	146,760				135,819
	Total investments	$	177,577			$	140,288
	-1	The increase in our investments during the nine months ended September 30, 2014, includes an increase in unrealized gains of approximately $13.6 million related to our investments in publicly traded life science companies. These unrealized gains are a component of our comprehensive income, within our stockholders’ equity, and have not been recognized in the accompanying consolidated statement of income for the nine months ended September 30, 2014.
	The following table outlines our investment (loss) income, which is classified in other income in the accompanying consolidated statements of income (in thousands):
		Three Months Ended September 30,							Nine Months Ended September 30,
		2014				2013			2014			2013
	Investment gains	$	3,256			$	2,050		$	9,481		$	4,716
	Investment losses	(3,485		)		—			(8,725		)	(529		)
	Investment (loss) income	$	(229	)		$	2,050		$	756		$	4,187

Secured_and_unsecured_senior_d

Secured and unsecured senior debt	9 Months Ended
	Sep. 30, 2014
Debt Disclosure [Abstract]	'
Secured and unsecured senior debt	'
	Secured and unsecured senior debt
	The following table summarizes our secured and unsecured senior debt as of September 30, 2014 (dollars in thousands):
		Fixed Rate/Hedged				Unhedged				Total				Percentage of Total Debt			Weighted Average			Weighted Average
		Variable Rate				Variable Rate				Consolidated							Interest Rate at			Remaining Term
																	End of Period (1)			(in years)
	Secured notes payable	$	406,125			$	230,700			$	636,825			18.2	%		4.67	%		2.9
	Unsecured senior notes payable	1,747,290				—				1,747,290				49.9			3.98			8.6
	$1.5 billion unsecured senior line of credit	—				142,000				142,000				4.1			1.25			4.3
	2016 Unsecured Senior Bank Term Loan	350,000				25,000				375,000				10.7			1.42			1.8
	2019 Unsecured Senior Bank Term Loan	600,000				—				600,000				17.1			2.05			4.3
	Total/weighted average	$	3,103,415			$	397,700			$	3,501,115			100	%		3.39	%		5.9
	Percentage of total debt	89		%		11		%		100		%
	-1	Represents the weighted average interest rate as of the end of the period plus the impact of debt premiums/discounts and our interest rate swap agreements. The weighted average interest rate excludes bank fees and amortization of loan fees.
	The following table summarizes our outstanding indebtedness and respective principal maturities as of
	September 30, 2014 (dollars in thousands):
			Stated			Weighted Average			Maturity Date(2)		Principal Payments Remaining for the Period Ending December 31,
	Debt		Rate			Interest Rate(1)					2014				2015				2016			2017			2018			Thereafter			Total
	Secured notes payable
	Seattle		6	%		6	%		11/18/14		$	60			$	—			$	—		$	—		$	—		$	—		$	60
	Maryland		5.64			4.5			6/1/15		34				5,777				—			—			—			—			5,811
	San Francisco Bay Area		L+1.50			1.66			7/1/15		—				46,596				—			—			—			—			46,596
	Greater Boston, San Francisco Bay Area, and San Diego		5.73			5.73			1/1/16		440				1,816				75,501			—			—			—			77,757
	Greater Boston, San Diego, and New York City		5.82			5.82			4/1/16		234				988				29,389			—			—			—			30,611
	San Diego		5.74			3			4/15/16		42				175				6,916			—			—			—			7,133
	San Francisco Bay Area		L+1.40			1.56			6/1/16		—				—				17,952			—			—			—			17,952
	San Francisco Bay Area		6.35			6.35			8/1/16		619				2,652				126,715			—			—			—			129,986
	Maryland		2.14			2.14			1/20/17		—				—				—			76,000			—			—			76,000
	Greater Boston		L+1.35			1.5			8/23/17		—				—				—			90,092			—			—			90,092
	San Diego, Maryland, and Seattle		7.75			7.75			4/1/20		374				1,570				1,696			1,832			1,979			106,490			113,941
	San Diego		4.66			4.66			1/1/23		337				1,402				1,464			1,540			1,614			33,367			39,724
	San Francisco Bay Area		6.5			6.5			6/1/37		—				18				19			20			22			751			830
	Unamortized premiums										54				218				60			—			—			—			332
	Secured notes payable average/subtotal		4.71	%		4.67					2,194				61,212				259,712			169,484			3,615			140,608			636,825
	2016 Unsecured Senior Bank Term Loan		L+1.20	%		1.42			7/31/16		—				—				375,000			—			—			—			375,000
	2019 Unsecured Senior Bank Term Loan		L+1.20	%		2.05			1/3/19		—				—				—			—			—			600,000			600,000
	$1.5 billion unsecured senior line of credit		L+1.10	%	(3)	1.25			1/3/19		—				—				—			—			—			142,000			142,000
	Unsecured senior notes payable		2.75	%		2.79			1/15/20		—				—				—			—			—			400,000			400,000
	Unsecured senior notes payable		4.6	%		4.61			4/1/22		—				—				—			—			—			550,000			550,000
	Unsecured senior notes payable		3.9	%		3.94			6/15/23		—				—				—			—			—			500,000			500,000
	Unsecured senior notes payable		4.5	%		4.51			7/30/29		—				—				—			—			—			300,000			300,000
	Unamortized discounts										(79		)		(326		)		(337		)	(350		)	(362		)	(1,256		)	(2,710		)
	Unsecured debt average/subtotal					3.11					(79		)		(326		)		374,663			(350		)	(362		)	2,490,744			2,864,290
	Average/total					3.39	%				$	2,115			$	60,886			$	634,375		$	169,134		$	3,253		$	2,631,352		$	3,501,115
	Balloon payments										$	—			$	52,336			$	629,851		$	166,092		$	—		$	2,622,238		$	3,470,517
	Principal amortization										2,115				8,550				4,524			3,042			3,253			9,114			30,598
	Total consolidated debt										$	2,115			$	60,886			$	634,375		$	169,134		$	3,253		$	2,631,352		$	3,501,115
	Fixed-rate/hedged variable-rate debt										$	2,055			$	14,290			$	591,423		$	3,042		$	3,253		$	2,489,352		$	3,103,415
	Unhedged variable-rate debt										60				46,596				42,952			166,092			—			142,000			397,700
	Total consolidated debt										$	2,115			$	60,886			$	634,375		$	169,134		$	3,253		$	2,631,352		$	3,501,115
	-1	Represents the weighted average interest rate as of the end of the period plus the impact of debt premiums/discounts and our interest rate swap agreements. The weighted average interest rate excludes bank fees and amortization of loan fees.
	-2	Includes any extension options that we control.
	-3	In addition to the stated rate, the unsecured senior line of credit is subject to an annual facility fee of 0.20%.
	2.75% and 4.50% Unsecured senior notes payable
	In July 2014, we completed an offering of $700 million unsecured senior notes payable at a weighted average interest rate of 3.50%. The offering consisted of $400 million of 2.75% unsecured senior notes (“2.75% Unsecured Senior Notes”) and $300 million of 4.50% unsecured senior notes (“4.50% Unsecured Senior Notes”).  The 2.75% Unsecured Senior Notes were priced at 99.793% of the principal amount with a yield to maturity of 2.791% and are due on January 15, 2020. The 4.50% Unsecured Senior Notes were priced at 99.912% of the principal amount with a yield to maturity of 4.508% and are due on July 30, 2029.  The unsecured senior notes payable are unsecured obligations of the Company and are fully and unconditionally guaranteed by Alexandria Real Estate Equities, L.P., a 100% owned subsidiary of the Company.  The unsecured senior notes payable rank equally in right of payment with all other senior unsecured indebtedness.  However, the unsecured senior notes payable are subordinate to existing and future mortgages and other secured indebtedness (to the extent of the value of the collateral securing such indebtedness) and to all existing and future preferred equity and liabilities, whether secured or unsecured, of the Company’s subsidiaries, other than Alexandria Real Estate Equities, L.P.  We used the net proceeds of this offering to reduce variable-rate debt, including the partial repayment of $125 million of our unsecured senior bank term loan due in 2016 (“2016 Unsecured Senior Bank Term Loan”) and to reduce the outstanding borrowings on our unsecured senior line by $569 million. In connection with the partial repayment of $125 million of our 2016 Unsecured Senior Bank Term Loan, we recognized a loss on early extinguishment of debt related to the write-off of unamortized loan fees totaling $525 thousand in July 2014.
	Interest expense
	The following table summarizes interest expense for the three and nine months ended September 30, 2014 and 2013 (in thousands):
		Three Months Ended September 30,								Nine Months Ended September 30,
		2014				2013				2014				2013
	Gross interest	$	32,680			$	32,959			$	92,551			$	96,668
	Capitalized interest	(12,125		)		(16,788		)		(35,440		)		(46,499		)
	Interest expense	$	20,555			$	16,171			$	57,111			$	50,169
	Repayment of secured note payable
	In January 2014, we repaid a $208.7 million secured note payable related to Alexandria Technology Square® which bore interest at a rate of 5.59%. Our JV partner funded $20.9 million of the proceeds required to repay the secured note payable.
In April 2014, we repaid a $6.4 million secured note payable related to a San Diego property which bore interest at a rate of 4.88%.
In August 2014, we repaid a $7.4 million secured note payable related to a San Diego property which bore interest at a rate of 4.00%.
Secured construction loans
The following table summarizes our secured construction loans as of September 30, 2014 (dollars in thousands):
Market		Stated Rate				Maturity Date				Outstanding Balance				Remaining Commitments				Total Aggregate Commitments
San Francisco Bay Area			L+1.50	%		7/1/15		(1)		$	46,596			$	8,404			$	55,000
San Francisco Bay Area			L+1.40	%		6/1/16		(2)		17,952				18,048				36,000
Greater Boston			L+1.35	%		8/23/17		(3)		90,092				160,308				250,400
										$	154,640			$	186,760			$	341,400
-1	We have two, one-year options to extend the stated maturity date to July 1, 2017, subject to certain conditions.
-2	We have two, one-year options to extend the stated maturity date to June 1, 2018, subject to certain conditions.
-3	We have a one-year option to extend the stated maturity date to August 23, 2018, subject to certain conditions.

Interest_rate_swap_agreements

Interest rate swap agreements	9 Months Ended
	Sep. 30, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Interest rate swap agreements	'
	Interest rate swap agreements
	We use interest rate swap agreements to hedge the variable cash flows associated with certain of our existing LIBOR-based variable-rate debt, including our unsecured senior line of credit and unsecured senior bank term loans.  The ineffective portion of the change in fair value of our interest rate swap agreements is required to be recognized directly in earnings.  During the nine months ended September 30, 2014 and 2013, our interest rate swap agreements were 100% effective; because of this, no hedge ineffectiveness was recognized in earnings.  Changes in fair value, including accrued interest and adjustments for non-performance risk, on the effective portion of our interest rate swap agreements that are designated and that qualify as cash flow hedges are classified in accumulated other comprehensive loss. Amounts classified in accumulated other comprehensive loss are subsequently reclassified into earnings in the period during which the hedged transactions affect earnings.  During the next 12 months, we expect to reclassify approximately $2.1 million in accumulated other comprehensive loss to interest expense as an increase to interest expense. As of September 30, 2014, and December 31, 2013, the fair values of our interest rate swap agreements aggregating an asset balance were classified in other assets, and those aggregating a liability balance were classified in accounts payable, accrued expenses, and tenant security deposits, based upon their respective fair values. Under our interest rate swap agreements, we have no collateral posting requirements.
	As of September 30, 2014, the fair value of derivatives in a net liability position was $287 thousand. The Company has agreements with certain of its derivative counterparties that contain a provision wherein (i) the Company could be declared in default on its derivative obligations if repayment of the underlying indebtedness is accelerated by the lender due to the Company’s default on the indebtedness; or (ii) if the Company defaults on any of its indebtedness, including default where repayment of the indebtedness has not been accelerated by the lender, then the Company could also be declared in default on its derivative obligations. If the Company had breached any of these provisions as of September 30, 2014, it could have been required to settle its obligations under the agreements at their termination value of $803 thousand.
	We had the following outstanding interest rate swap agreements that were designated as cash flow hedges of interest rate risk as of September 30, 2014 (dollars in thousands):
	Effective Date		Maturity Date	Number of Contracts	Weighted Average Interest Pay	Fair Value as of 9/30/14			Notional Amount in Effect as of
					Rate (1)				9/30/14		12/31/14		12/31/15		12/31/16
	31-Dec-13		31-Dec-14	2	0.98%	$	(1,051	)	$	500,000	$	—	$	—	$	—
	31-Dec-13		31-Mar-15	2	0.23%	(110		)	250,000		250,000		—		—
	31-Mar-14		31-Mar-15	4	0.21%	(61		)	200,000		200,000		—		—
	31-Dec-14		31-Mar-16	3	0.53%	(23		)	—		500,000		500,000		—
	31-Mar-16		31-Mar-17	3	1.40%	958			—		—		—		500,000
	Total					$	(287	)	$	950,000	$	950,000	$	500,000	$	500,000
	-1	In addition to the interest pay rate, borrowings outstanding as of September 30, 2014, under our unsecured senior bank term loans include an applicable margin of 1.20% and borrowings outstanding under our unsecured senior line of credit include an applicable margin of 1.10%.

Fair_value_measurements

Fair value measurements	9 Months Ended
	Sep. 30, 2014
Fair Value Disclosures [Abstract]	'
Fair value measurements	'
	Fair value measurements
	We are required to disclose fair value information about all financial instruments, whether or not recognized in the balance sheet, for which it is practicable to estimate fair value.  We measure and disclose the estimated fair value of financial assets and liabilities utilizing a fair value hierarchy that distinguishes between data obtained from sources independent of the reporting entity and the reporting entity’s own assumptions about market participant assumptions.  This hierarchy consists of three broad levels, as follows: (i) quoted prices in active markets for identical assets or liabilities, (ii) “significant other observable inputs,” and (iii) “significant unobservable inputs.”  “Significant other observable inputs” can include quoted prices for similar assets or liabilities in active markets, as well as inputs that are observable for the asset or liability, such as interest rates, foreign exchange rates, and yield curves that are observable at commonly quoted intervals.  “Significant unobservable inputs” are typically based on an entity’s own assumptions, since there is little, if any, related market activity.  In instances in which the determination of the fair value measurement is based on inputs from different levels of the fair value hierarchy, the level in the fair value hierarchy within which the entire fair value measurement falls is based on the lowest level of input that is significant to the fair value measurement in its entirety.  Our assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the asset or liability.  There were no transfers between the levels in the fair value hierarchy during the three and nine months ended September 30, 2014 and 2013.
	The following tables set forth the assets and liabilities that we measure at fair value on a recurring basis by level within the fair value hierarchy as of September 30, 2014, and December 31, 2013 (in thousands):
						30-Sep-14
	Description		Total			Quoted Prices in			Significant			Significant
						Active Markets			Other			Unobservable
						for Identical			Observable			Inputs
						Assets			Inputs
	Assets:
	“Available-for-sale” securities		$	30,817		$	30,817		$	—		$	—
	Interest rate swap agreements		$	958		$	—		$	958		$	—
	Liabilities:
	Interest rate swap agreements		$	1,245		$	—		$	1,245		$	—
						31-Dec-13
	Description		Total			Quoted Prices in			Significant			Significant
						Active Markets			Other			Unobservable
						for Identical			Observable			Inputs
						Assets			Inputs
	Assets:
	“Available-for-sale” securities		$	4,469		$	4,469		$	—		$	—
	Interest rate swap agreements		$	2,870		$	—		$	2,870		$	—
	Liabilities:
	Interest rate swap agreements		$	6,191		$	—		$	6,191		$	—
	Cash and cash equivalents, restricted cash, tenant receivables, other assets, accounts payable, accrued expenses, and tenant security deposits approximate fair value.  Our “available-for-sale” securities and our interest rate swap agreements, respectively, have been recognized at fair value.  See Note 6 – Interest Rate Swap Agreements, for further details on our interest rate swap agreements. The fair values of our secured notes payable, unsecured senior notes payable, unsecured senior line of credit, and unsecured senior bank term loans were estimated using widely accepted valuation techniques, including discounted cash flow analyses of “significant other observable inputs” such as available market information on discount and borrowing rates with similar terms, maturities, and credit ratings.  Because the valuations of our financial instruments are based on these types of estimates, the actual fair value of our financial instruments may differ materially if our estimates do not prove to be accurate.  Additionally, the use of different market assumptions or estimation methods may have a material effect on the estimated fair value amounts.
	As of September 30, 2014, and December 31, 2013, the book and fair values of our “available-for-sale” marketable equity securities, interest rate swap agreements, secured notes payable, unsecured senior notes payable, unsecured senior line of credit, and unsecured senior bank term loans were as follows (in thousands):
		30-Sep-14						31-Dec-13
		Book Value			Fair Value			Book Value			Fair Value
	Assets:
	“Available-for-sale” marketable equity securities	$	30,817		$	30,817		$	4,469		$	4,469
	Interest rate swap agreements	$	958		$	958		$	2,870		$	2,870
	Liabilities:
	Interest rate swap agreements	$	1,245		$	1,245		$	6,191		$	6,191
	Secured notes payable	$	636,825		$	686,388		$	708,831		$	736,772
	Unsecured senior notes payable	$	1,747,290		$	1,775,990		$	1,048,230		$	1,043,125
	Unsecured senior line of credit	$	142,000		$	141,881		$	204,000		$	193,714
	Unsecured senior bank term loans	$	975,000		$	974,424		$	1,100,000		$	1,099,897

Earnings_per_share

Earnings per share	9 Months Ended
	Sep. 30, 2014
Earnings Per Share [Abstract]	'
Earnings per share	'
	Earnings per share (EPS)
	We use income from continuing operations attributable to Alexandria’s common stockholders as the “control number” in determining whether potential common shares are dilutive or antidilutive to EPS.  Pursuant to the presentation and disclosure literature on gains or losses on sales or disposals by REITs and EPS required by the SEC and the FASB, gains or losses on sales or disposals by a REIT that do not qualify as discontinued operations are classified below income from discontinued operations in the consolidated statements of income and included in the numerator for the computation of EPS for income from continuing operations.
	The land parcels we sold during the three and nine months ended September 30, 2014 and 2013, did not meet the criteria for classification as discontinued operations because the land parcels did not have significant operations prior to disposition.  Accordingly, for the nine months ended September 30, 2014 and 2013, we classified approximately $805 thousand and $772 thousand, respectively, as gain on sale of land parcel below income from discontinued operations, net, in the accompanying consolidated statements of income, and included the gain in income from continuing operations attributable to Alexandria’s common stockholders in the “control number,” or numerator, for computation of EPS.
	We account for unvested restricted stock awards that contain nonforfeitable rights to dividends as participating securities and include these securities in the computation of EPS using the two-class method.  Our Series D cumulative convertible preferred stock (“Series D Preferred Stock”) is not a participating security, and is not included in the computation of EPS using the two-class method.  Under the two-class method, we allocate net income after preferred stock dividends, preferred stock redemption charge, and amounts attributable to noncontrolling interests to common stockholders and unvested restricted stock awards based on their respective participation rights to dividends declared (or accumulated) and undistributed earnings.  Diluted EPS is computed using the weighted average shares of common stock outstanding determined for the basic EPS computation plus the effect of any dilutive securities, including the dilutive effect of stock options using the treasury stock method, during the period the securities were outstanding.
	The table below is a reconciliation of the numerators and denominators of the basic and diluted EPS computations for the three and nine months ended September 30, 2014 and 2013 (dollars in thousands, except per share amounts):
		Three Months Ended September 30,						Nine Months Ended September 30,
		2014			2013			2014			2013
	Income from continuing operations	$	36,115		$	32,496		$	112,492		$	94,212
	Gain on sales of land parcels	8			—			805			772
	Dividends on preferred stock	(6,471		)	(6,472		)	(19,414		)	(19,414		)
	Net income attributable to noncontrolling interests	(1,340		)	(960		)	(3,842		)	(2,922		)
	Net income attributable to unvested restricted stock awards	(506		)	(442		)	(1,285		)	(1,187		)
	Income from continuing operations attributable to Alexandria’s common stockholders – basic and diluted	27,806			24,622			88,756			71,461
	(Loss) income from discontinued operations	(180		)	(43		)	(489		)	1,043
	Net income attributable to Alexandria’s common stockholders – basic and diluted	$	27,626		$	24,579		$	88,267		$	72,504
	Weighted average shares of common stock outstanding – basic and diluted	71,195			70,900			71,121			67,040
	EPS attributable to Alexandria’s common stockholders – basic and diluted:
	Continuing operations	$	0.39		$	0.35		$	1.25		$	1.06
	Discontinued operations	—			—			(0.01		)	0.02
	EPS – basic and diluted	$	0.39		$	0.35		$	1.24		$	1.08
	For purposes of calculating diluted EPS, we did not assume conversion of our Series D Preferred Stock for the three and nine months ended September 30, 2014 and 2013, since the impact was antidilutive to EPS attributable to Alexandria’s common stockholders from continuing operations during those periods.

Stockholders_equity

Stockholders' equity	9 Months Ended
	Sep. 30, 2014
Stockholders' Equity Note [Abstract]	'
Stockholders' equity	'
	Stockholders’ equity
	Dividends
	In September 2014, we declared cash dividends on our common stock for the third quarter of 2014, aggregating $51.8 million, or $0.72 per share.  In September 2014, we also declared cash dividends on our Series D Preferred Stock for the third quarter of 2014, aggregating approximately $4.4 million, or $0.4375 per share.  Additionally, we declared cash dividends on our Series E cumulative redeemable preferred stock (“Series E Preferred Stock”) for the third quarter of 2014, aggregating approximately $2.1 million, or $0.403125 per share.  In October 2014, we paid the cash dividends on our common stock, Series D Preferred Stock, and Series E Preferred Stock for the third quarter of 2014.
	Accumulated other comprehensive loss
	Accumulated other comprehensive loss attributable to Alexandria Real Estate Equities, Inc. consists of the following (in thousands):
		Unrealized Gain on Marketable Securities		Unrealized Loss on Interest Rate Swap Agreements			Unrealized Loss on Foreign Currency Translation			Total
	Balance as of December 31, 2013	$	1,590	$	(3,321	)	$	(34,473	)	$	(36,204	)
	Other comprehensive income (loss) before reclassifications	13,591		(2,708		)	(9,450		)	1,433
	Amounts reclassified from other comprehensive income (loss)	517		5,742			(199		)	6,060
	Net other comprehensive income (loss)	14,108		3,034			(9,649		)	7,493
	Balance as of September 30, 2014	$	15,698	$	(287	)	$	(44,122	)	$	(28,711	)
	Preferred stock and excess stock authorizations
	Our charter authorizes the issuance of up to 100.0 million shares of preferred stock, of which 15.2 million shares were issued and outstanding as of September 30, 2014.  In addition, 200.0 million shares of “excess stock” (as defined in our charter) are authorized, none of which were issued and outstanding as of September 30, 2014.

Noncontrolling_interests

Noncontrolling interests	9 Months Ended
	Sep. 30, 2014
Noncontrolling Interest [Abstract]	'
Noncontrolling interests	'
	Noncontrolling interests
	Noncontrolling interests represent the third-party interests in certain entities in which we have a controlling interest.  These entities owned four projects as of September 30, 2014, and are included in our consolidated financial statements.  Noncontrolling interests are adjusted for additional contributions and distributions, the proportionate share of the net earnings or losses, and other comprehensive income or loss.  Distributions, profits, and losses related to these entities are allocated in accordance with the respective operating agreements.
	The following table represents income from continuing operations and discontinued operations attributable to Alexandria Real Estate Equities, Inc., for the three and nine months ended September 30, 2014 and 2013, excluding the amounts attributable to these noncontrolling interests:
		Three Months Ended September 30,				Nine Months Ended September 30,
		2014		2013		2014		2013
	Income from continuing operations attributable to Alexandria Real Estate Equities, Inc.	34,775		31,536		108,650		91,290
	(Loss) income from discontinued operations	(180	)	(43	)	(489	)	1,043
	Certain of our noncontrolling interests have the right to require us to redeem their ownership interests in the respective entities.  We classify these ownership interests in the entities as redeemable noncontrolling interests outside of total equity in the accompanying consolidated balance sheets.  Redeemable noncontrolling interests are adjusted for additional contributions and distributions, the proportionate share of the net earnings or losses, and other comprehensive income or loss.  Distributions, profits, and losses related to these entities are allocated in accordance with the respective operating agreements.  If the amount of a redeemable noncontrolling interest is less than the maximum redemption value at the balance sheet date, such amount is adjusted to the maximum redemption value.  Subsequent declines in the redemption value are recognized only to the extent that previous increases have been recognized.

Discontinued_operations

Discontinued operations	9 Months Ended
	Sep. 30, 2014
Discontinued Operations and Disposal Groups [Abstract]	'
Discontinued operations	'
	Discontinued operations
	The following is a summary of net assets of discontinued operations and (loss) income from discontinued operations (in thousands):
		September 30, 2014				December 31, 2013
	Properties “held for sale,” net	$	7,648			$	7,644
	Other assets	20				103
	Total assets	7,668				7,747
	Total liabilities	(172		)		(266		)
	Net assets of discontinued operations	$	7,496			$	7,481
			Three Months Ended September 30,							Nine Months Ended September 30,
			2014				2013			2014			2013
	Total revenues		$	—			$	319		$	—		$	4,658
	Operating expenses		180				126			489			1,856
	Total revenues less operating expenses from discontinued operations		(180		)		193			(489		)	2,802
	Depreciation expense		—				236			—			1,638
	Loss on sale of real estate		—				—			—			121
	(Loss) income from discontinued operations (1)		$	(180	)		$	(43	)	$	(489	)	$	1,043
	-1	(Loss) income from discontinued operations includes the results of operations of four properties that were classified as “held for sale” as of September 30, 2014, as well as the results of operations (prior to disposition) and gain on sale of real estate attributable to seven properties sold during the period from January 1, 2013, to September 30, 2014. In October 2014, we completed the sale of one property which was classified as “held for sale” as of September 30, 2014.

Condensed_consolidating_financ

Condensed consolidating financial information	9 Months Ended
	Sep. 30, 2014
Condensed Consolidated Financial Information [Abstract]	'
Condensed consolidating financial information	'
	Condensed consolidating financial information
	Alexandria Real Estate Equities, Inc. (the “Issuer”) has sold certain debt securities registered under the Securities Act, as amended, that are fully and unconditionally guaranteed by Alexandria Real Estate Equities, L.P. (the “LP” or the “Guarantor Subsidiary”), an indirectly 100% owned subsidiary of the Issuer. The Company’s other subsidiaries, including, but not limited to, the subsidiaries that own substantially all of its real estate (collectively, the “Combined Non-Guarantor Subsidiaries”) will not provide a guarantee of such securities, including the subsidiaries that are partially or 100% owned by the LP. The following condensed consolidating financial information presents the condensed consolidating balance sheets as of September 30, 2014, and December 31, 2013, and the condensed consolidating statements of income and comprehensive income for the three and nine months ended September 30, 2014 and 2013, and condensed consolidating cash flows for the nine months ended September 30, 2014 and 2013, for the Issuer, the Guarantor Subsidiary, the Combined Non-Guarantor Subsidiaries, as well as the eliminations necessary to arrive at the information for Alexandria Real Estate Equities, Inc. on a consolidated basis, and consolidated amounts. In presenting the condensed consolidating financial statements, the equity method of accounting has been applied to (i) the Issuer’s interests in the Guarantor Subsidiary and the Combined Non-Guarantor Subsidiaries, (ii) the Guarantor Subsidiary’s interests in the Combined Non-Guarantor Subsidiaries, and (iii) the Combined Non-Guarantor Subsidiaries’ interests in the Guarantor Subsidiary, where applicable, even though all such subsidiaries meet the requirements to be consolidated under GAAP. All intercompany balances and transactions between the Issuer, the Guarantor Subsidiary, and the Combined Non-Guarantor Subsidiaries have been eliminated, as shown in the column “Eliminations.” All assets and liabilities have been allocated to the Issuer, the Guarantor Subsidiary, and the Combined Non-Guarantor Subsidiaries generally based on legal entity ownership.
	Condensed Consolidating Balance Sheet
	as of September 30, 2014
	(In thousands)
	(Unaudited)
		Alexandria Real Estate Equities, Inc.			Alexandria			Combined			Eliminations			Consolidated
		(Issuer)			Real Estate			Non-
					Equities, L.P.			Guarantor
					(Guarantor			Subsidiaries
					Subsidiary)
	Assets
	Investments in real estate	$	—		$	—		$	7,197,630		$	—		$	7,197,630
	Cash and cash equivalents	21,455			—			45,568			—			67,023
	Restricted cash	70			—			24,175			—			24,245
	Tenant receivables	—			—			10,830			—			10,830
	Deferred rent	—			—			225,506			—			225,506
	Deferred leasing and financing costs	37,486			—			162,349			—			199,835
	Investments	—			8,147			169,430			—			177,577
	Investments in and advances to affiliates	6,812,172			6,291,506			129,268			(13,232,946		)	—
	Other assets	19,244			—			98,424			—			117,668
	Total assets	$	6,890,427		$	6,299,653		$	8,063,180		$	(13,232,946	)	$	8,020,314
	Liabilities, Noncontrolling Interests, and Equity
	Secured notes payable	$	—		$	—		$	636,825		$	—		$	636,825
	Unsecured senior notes payable	1,747,290			—			—			—			1,747,290
	Unsecured senior line of credit	142,000			—			—			—			142,000
	Unsecured senior bank term loans	975,000			—			—			—			975,000
	Accounts payable, accrued expenses, and tenant security deposits	93,679			—			410,856			—			504,535
	Dividends payable	57,260			—			289			—			57,549
	Total liabilities	3,015,229			—			1,047,970			—			4,063,199
	Redeemable noncontrolling interests	—			—			14,348			—			14,348
	Alexandria Real Estate Equities, Inc.’s stockholders’ equity	3,875,198			6,299,653			6,933,293			(13,232,946		)	3,875,198
	Noncontrolling interests	—			—			67,569			—			67,569
	Total equity	3,875,198			6,299,653			7,000,862			(13,232,946		)	3,942,767
	Total liabilities, noncontrolling interests, and equity	$	6,890,427		$	6,299,653		$	8,063,180		$	(13,232,946	)	$	8,020,314
	Condensed Consolidating Balance Sheet
	as of December 31, 2013
	(In thousands)
	(Unaudited)
		Alexandria			Alexandria			Combined			Eliminations			Consolidated
		Real Estate			Real Estate			Non-
		Equities, Inc.			Equities, L.P.			Guarantor
		(Issuer)			(Guarantor			Subsidiaries
					Subsidiary)
	Assets
	Investments in real estate	$	—		$	—		$	6,776,914		$	—		$	6,776,914
	Cash and cash equivalents	14,790			—			42,906			—			57,696
	Restricted cash	55			—			27,654			—			27,709
	Tenant receivables	—			—			9,918			—			9,918
	Deferred rent	—			—			190,425			—			190,425
	Deferred leasing and financing costs	36,901			—			155,757			—			192,658
	Investments	—			10,868			129,420			—			140,288
	Investments in and advances to affiliates	6,299,551			5,823,058			119,421			(12,242,030		)	—
	Other assets	20,226			—			113,930			—			134,156
	Total assets	$	6,371,523		$	5,833,926		$	7,566,345		$	(12,242,030	)	$	7,529,764
	Liabilities, Noncontrolling Interests, and Equity
	Secured notes payable	$	—		$	—		$	708,831		$	—		$	708,831
	Unsecured senior notes payable	1,048,230			—			—			—			1,048,230
	Unsecured senior line of credit	204,000			—			—			—			204,000
	Unsecured senior bank term loans	1,100,000			—			—			—			1,100,000
	Accounts payable, accrued expenses, and tenant security deposits	48,373			—			386,969			—			435,342
	Dividends payable	54,131			—			289			—			54,420
	Total liabilities	2,454,734			—			1,096,089			—			3,550,823
Redeemable noncontrolling interests	—			—			14,444			—			14,444
Alexandria Real Estate Equities, Inc.’s stockholders’ equity	3,916,789			5,833,926			6,408,104			(12,242,030		)	3,916,789
Noncontrolling interests	—			—			47,708			—			47,708
Total equity	3,916,789			5,833,926			6,455,812			(12,242,030		)	3,964,497
Total liabilities, noncontrolling interests, and equity	$	6,371,523		$	5,833,926		$	7,566,345		$	(12,242,030	)	$	7,529,764
Condensed Consolidating Statement of Income
for the Three Months Ended September 30, 2014
(In thousands)
(Unaudited)
	Alexandria			Alexandria			Combined			Eliminations			Consolidated
	Real Estate			Real Estate			Non-
	Equities, Inc.			Equities, L.P.			Guarantor
	(Issuer)			(Guarantor			Subsidiaries
				Subsidiary)
Revenues:
Rental	$	—		$	—		$	137,718		$	—		$	137,718
Tenant recoveries	—			—			45,572			—			45,572
Other income	2,797			(1,264		)	4,369			(3,577		)	2,325
Total revenues	2,797			(1,264		)	187,659			(3,577		)	185,615
Expenses:
Rental operations	—			—			57,423			—			57,423
General and administrative	11,369			—			4,817			(3,577		)	12,609
Interest	15,307			—			5,248			—			20,555
Depreciation and amortization	1,408			—			56,980			—			58,388
Loss on early extinguishment of debt	525			—			—			—			525
Total expenses	28,609			—			124,468			(3,577		)	149,500
(Loss) income from continuing operations before equity in earnings of affiliates	(25,812		)	(1,264		)	63,191			—			36,115
Equity in earnings of affiliates	60,415			58,381			1,127			(119,923		)	—
Income from continuing operations	34,603			57,117			64,318			(119,923		)	36,115
Loss from discontinued operations	—			—			(180		)	—			(180		)
Gain on sales of land parcels	—			—			8			—			8
Net income	34,603			57,117			64,146			(119,923		)	35,943
Dividends on preferred stock	(6,471		)	—			—			—			(6,471		)
Net income attributable to noncontrolling interests	—			—			(1,340		)	—			(1,340		)
Net income attributable to unvested restricted stock awards	(506		)	—			—			—			(506		)
Net income attributable to Alexandria Real Estate Equities, Inc.’s common stockholders	$	27,626		$	57,117		$	62,806		$	(119,923	)	$	27,626
Condensed Consolidating Statement of Income
for the Three Months Ended September 30, 2013
(In thousands)
(Unaudited)
	Alexandria			Alexandria			Combined			Eliminations			Consolidated
	Real Estate			Real Estate			Non-
	Equities, Inc.			Equities, L.P.			Guarantor
	(Issuer)			(Guarantor			Subsidiaries
				Subsidiary)
Revenues:
Rental	$	—		$	—		$	116,052		$	—		$	116,052
Tenant recoveries	—			—			38,691			—			38,691
Other income	2,802			(1		)	3,966			(3,195		)	3,572
Total revenues	2,802			(1		)	158,709			(3,195		)	158,315
Expenses:
Rental operations	—			—			47,684			—			47,684
General and administrative	10,140			—			4,721			(3,195		)	11,666
Interest	10,238			—			5,933			—			16,171
Depreciation and amortization	1,473			—			47,393			—			48,866
Loss on early extinguishment of debt	1,432			—			—			—			1,432
Total expenses	23,283			—			105,731			(3,195		)	125,819
(Loss) income from continuing operations before equity in earnings of affiliates	(20,481		)	(1		)	52,978			—			32,496
Equity in earnings of affiliates	51,975			48,477			959			(101,411		)	—
Income from continuing operations	31,494			48,476			53,937			(101,411		)	32,496
Loss from discontinued operations	(1		)	—			(42		)	—			(43		)
Net income	31,493			48,476			53,895			(101,411		)	32,453
Dividends on preferred stock	(6,472		)	—			—			—			(6,472		)
Net income attributable to noncontrolling interests	—			—			(960		)	—			(960		)
Net income attributable to unvested restricted stock awards	(442		)	—			—			—			(442		)
Net income attributable to Alexandria Real Estate Equities, Inc.’s common stockholders	$	24,579		$	48,476		$	52,935		$	(101,411	)	$	24,579
Condensed Consolidating Statement of Income
for the Nine Months Ended September 30, 2014
(In thousands)
(Unaudited)
	Alexandria			Alexandria			Combined			Eliminations			Consolidated
	Real Estate			Real Estate			Non-
	Equities, Inc.			Equities, L.P.			Guarantor
	(Issuer)			(Guarantor			Subsidiaries
				Subsidiary)
Revenues:
Rental	$	—		$	—		$	403,280		$	—		$	403,280
Tenant recoveries	—			—			128,198			—			128,198
Other income	8,632			(2,799		)	11,534			(10,642		)	6,725
Total revenues	8,632			(2,799		)	543,012			(10,642		)	538,203
Expenses:
Rental operations	—			—			162,283			—			162,283
General and administrative	33,735			—			16,576			(10,642		)	39,669
Interest	41,339			—			15,772			—			57,111
Depreciation and amortization	4,335			—			161,788			—			166,123
Loss on early extinguishment of debt	525			—			—			—			525
Total expenses	79,934			—			356,419			(10,642		)	425,711
(Loss) income from continuing operations before equity in earnings of affiliates	(71,302		)	(2,799		)	186,593			—			112,492
Equity in earnings of affiliates	180,275			172,989			3,356			(356,620		)	—
Income from continuing operations	108,973			170,190			189,949			(356,620		)	112,492
Loss from discontinued operations	(7		)	—			(482		)	—			(489		)
Gain on sales of land parcels	—			—			805			—			805
Net income	108,966			170,190			190,272			(356,620		)	112,808
Dividends on preferred stock	(19,414		)	—			—			—			(19,414		)
Net income attributable to noncontrolling interests	—			—			(3,842		)	—			(3,842		)
Net income attributable to unvested restricted stock awards	(1,285		)	—			—			—			(1,285		)
Net income attributable to Alexandria Real Estate Equities, Inc.’s common stockholders	$	88,267		$	170,190		$	186,430		$	(356,620	)	$	88,267
Condensed Consolidating Statement of Income
for the Nine Months Ended September 30, 2013
(In thousands)
(Unaudited)
	Alexandria			Alexandria			Combined			Eliminations			Consolidated
	Real Estate			Real Estate			Non-
	Equities, Inc.			Equities, L.P.			Guarantor
	(Issuer)			(Guarantor			Subsidiaries
				Subsidiary)
Revenues:
Rental	$	—		$	—		$	342,071		$	—		$	342,071
Tenant recoveries	—			—			110,125			—			110,125
Other income	8,071			(142		)	11,635			(9,432		)	10,132
Total revenues	8,071			(142		)	463,831			(9,432		)	462,328
Expenses:
Rental operations	—			—			139,147			—			139,147
General and administrative	32,573			—			12,628			(9,432		)	35,769
Interest	32,048			—			18,121			—			50,169
Depreciation and amortization	4,394			—			136,645			—			141,039
Loss on early extinguishment of debt	1,992			—			—			—			1,992
Total expenses	71,007			—			306,541			(9,432		)	368,116
(Loss) income from continuing operations before equity in earnings of affiliates	(62,936		)	(142		)	157,290			—			94,212
Equity in earnings of affiliates	155,694			144,660			2,858			(303,212		)	—
Income from continuing operations	92,758			144,518			160,148			(303,212		)	94,212
Income from discontinued operations	347			—			696			—			1,043
Gain on sales of land parcels	—			—			772			—			772
Net income	93,105			144,518			161,616			(303,212		)	96,027
Dividends on preferred stock	(19,414		)	—			—			—			(19,414		)
Net income attributable to noncontrolling interests	—			—			(2,922		)	—			(2,922		)
Net income attributable to unvested restricted stock awards	(1,187		)	—			—			—			(1,187		)
Net income attributable to Alexandria Real Estate Equities, Inc.’s common stockholders	$	72,504		$	144,518		$	158,694		$	(303,212	)	$	72,504
Condensed Consolidating Statement of Comprehensive Income
for the Three Months Ended September 30, 2014
(In thousands)
(Unaudited)
	Alexandria			Alexandria			Combined			Eliminations			Consolidated
	Real Estate			Real Estate			Non-
	Equities, Inc.			Equities, L.P.			Guarantor
	(Issuer)			(Guarantor			Subsidiaries
				Subsidiary)
Net income	$	34,603		$	57,117		$	64,146		$	(119,923	)	$	35,943
Other comprehensive income (loss):
Unrealized losses on marketable securities:
Unrealized holding losses arising during the period	—			(310		)	(2,144		)	—			(2,454		)
Reclassification adjustment for losses included in net income	—			—			111			—			111
Unrealized losses on marketable securities, net	—			(310		)	(2,033		)	—			(2,343		)
Unrealized gains on interest rate swap agreements:
Unrealized interest rate swap gains arising during the period	1,206			—			—			—			1,206
Reclassification adjustment for amortization of interest expense included in net income	1,129			—			—			—			1,129
Unrealized gains on interest rate swap agreements, net	2,335			—			—			—			2,335
Unrealized losses on foreign currency translation:
Unrealized foreign currency translation losses during the period	—			—			(12,259		)	—			(12,259		)
Reclassification adjustment for gains included in net income	—			—			(199		)	—			(199		)
Unrealized losses on foreign currency translation, net	—			—			(12,458		)	—			(12,458		)
Total other comprehensive income (loss)	2,335			(310		)	(14,491		)	—			(12,466		)
Comprehensive income	36,938			56,807			49,655			(119,923		)	23,477
Less: comprehensive income attributable to noncontrolling interests	—			—			(1,340		)	—			(1,340		)
Comprehensive income attributable to Alexandria’s common stockholders	$	36,938		$	56,807		$	48,315		$	(119,923	)	$	22,137
Condensed Consolidating Statement of Comprehensive Income
for the Three Months Ended September 30, 2013
(In thousands)
(Unaudited)
	Alexandria			Alexandria			Combined			Eliminations			Consolidated
	Real Estate			Real Estate			Non-
	Equities, Inc.			Equities, L.P.			Guarantor
	(Issuer)			(Guarantor			Subsidiaries
				Subsidiary)
Net income	$	31,493		$	48,476		$	53,895		$	(101,411	)	$	32,453
Other comprehensive income (loss):
Unrealized losses on marketable securities:
Unrealized holding (losses) gains arising during the period	—			(796		)	759			—			(37		)
Reclassification adjustment for losses (gains) included in net income	—			519			(769		)	—			(250		)
Unrealized losses on marketable securities, net	—			(277		)	(10		)	—			(287		)
Unrealized gains on interest rate swap agreements:
Unrealized interest rate swap losses arising during the period	(676		)	—			—			—			(676		)
Reclassification adjustment for amortization of interest expense included in net income	3,904			—			—			—			3,904
Unrealized gains on interest rate swap agreements, net	3,228			—			—			—			3,228
Foreign currency translation losses	—			—			(3,404		)	—			(3,404		)
Total other comprehensive income (loss)	3,228			(277		)	(3,414		)	—			(463		)
Comprehensive income	34,721			48,199			50,481			(101,411		)	31,990
Less: comprehensive income attributable to noncontrolling interests	—			—			(933		)	—			(933		)
Comprehensive income attributable to Alexandria’s common stockholders	$	34,721		$	48,199		$	49,548		$	(101,411	)	$	31,057
Condensed Consolidating Statement of Comprehensive Income
for the Nine Months Ended September 30, 2014
(In thousands)
(Unaudited)
	Alexandria			Alexandria			Combined			Eliminations			Consolidated
	Real Estate			Real Estate			Non-
	Equities, Inc.			Equities, L.P.			Guarantor
	(Issuer)			(Guarantor			Subsidiaries
				Subsidiary)
Net income	$	108,966		$	170,190		$	190,272		$	(356,620	)	$	112,808
Other comprehensive income:
Unrealized gains on marketable securities:
Unrealized holding gains arising during the period	—			—			13,591			—			13,591
Reclassification adjustment for losses included in net income	—			—			517			—			517
Unrealized gains on marketable securities, net	—			—			14,108			—			14,108
Unrealized gains on interest rate swap agreements:
Unrealized interest rate swap losses arising during the period	(2,708		)	—			—			—			(2,708		)
Reclassification adjustment for amortization of interest expense included in net income	5,742			—			—			—			5,742
Unrealized gains on interest rate swap agreements, net	3,034			—			—			—			3,034
Unrealized losses on foreign currency translation:
Unrealized foreign currency translation losses during the period	—			—			(9,450		)	—			(9,450		)
Reclassification adjustment for gains included in net income	—			—			(199		)	—			(199		)
Unrealized losses on foreign currency translation, net	—			—			(9,649		)	—			(9,649		)
Total other comprehensive income	3,034			—			4,459			—			7,493
Comprehensive income	112,000			170,190			194,731			(356,620		)	120,301
Less: comprehensive income attributable to noncontrolling interests	—			—			(3,842		)	—			(3,842		)
Comprehensive income attributable to Alexandria’s common stockholders	$	112,000		$	170,190		$	190,889		$	(356,620	)	$	116,459
Condensed Consolidating Statement of Comprehensive Income
for the Nine Months Ended September 30, 2013
(In thousands)
(Unaudited)
	Alexandria			Alexandria			Combined			Eliminations			Consolidated
	Real Estate			Real Estate			Non-
	Equities, Inc.			Equities, L.P.			Guarantor
	(Issuer)			(Guarantor			Subsidiaries
				Subsidiary)
Net income	$	93,105		$	144,518		$	161,616		$	(303,212	)	$	96,027
Other comprehensive income (loss):
Unrealized (losses) gains on marketable securities:
Unrealized holding (losses) gains arising during the period	—			(391		)	714			—			323
Reclassification adjustment for losses (gains) included in net income	—			144			(624		)	—			(480		)
Unrealized (losses) gains on marketable securities, net	—			(247		)	90			—			(157		)
Unrealized gains on interest rate swap agreements:
Unrealized interest rate swap losses arising during the period	(704		)	—			—			—			(704		)
Reclassification adjustment for amortization of interest expense included in net income	12,046			—			—			—			12,046
Unrealized gains on interest rate swap agreements, net	11,342			—			—			—			11,342
Foreign currency translation losses	—			—			(26,461		)	—			(26,461		)
Total other comprehensive income (loss)	11,342			(247		)	(26,371		)	—			(15,276		)
Comprehensive income	104,447			144,271			135,245			(303,212		)	80,751
Less: comprehensive income attributable to noncontrolling interests	—			—			(2,839		)	—			(2,839		)
Comprehensive income attributable to Alexandria’s common stockholders	$	104,447		$	144,271		$	132,406		$	(303,212	)	$	77,912
Condensed Consolidating Statement of Cash Flows
for the Nine Months Ended September 30, 2014
(In thousands)
(Unaudited)
	Alexandria Real			Alexandria Real			Combined			Eliminations			Consolidated
	Estate Equities,			Estate Equities,			Non-Guarantor
	Inc. (Issuer)			L.P. (Guarantor			Subsidiaries
				Subsidiary)
Operating Activities
Net income	$	108,966		$	170,190		$	190,272		$	(356,620	)	$	112,808
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Depreciation and amortization	4,335			—			161,788			—			166,123
Loss on early extinguishment of debt	525			—			—			—			525
Gain on sale of land parcel	—			—			(805		)	—			(805		)
Amortization of loan fees and costs	5,424			—			2,666			—			8,090
Amortization of debt premiums/discounts	152			—			(52		)	—			100
Amortization of acquired above and below market leases	—			—			(2,191		)	—			(2,191		)
Deferred rent	—			—			(35,511		)	—			(35,511		)
Stock compensation expense	9,372			—			—			—			9,372
Equity in income related to subsidiaries	(180,275		)	(172,989		)	(3,356		)	356,620			—
Investment gains	—			(3		)	(9,478		)	—			(9,481		)
Investment losses	—			2,802			5,923			—			8,725
Changes in operating assets and liabilities:
Restricted cash	(15		)	—			15			—			—
Tenant receivables	—			—			(939		)	—			(939		)
Deferred leasing costs	(80		)	—			(25,830		)	—			(25,910		)
Other assets	(5,263		)	—			(6,965		)	—			(12,228		)
Accounts payable, accrued expenses, and tenant security deposits	50,210			—			(13,764		)	—			36,446
Net cash (used in) provided by operating activities	(6,649		)	—			261,773			—			255,124
Investing Activities
Proceeds from sale of properties	—			—			28,378			—			28,378
Additions to properties	—			—			(345,074		)	—			(345,074		)
Purchase of properties	—			—			(97,785		)	—			(97,785		)
Deposits for property acquisitions	—			—			(7,292		)	—			(7,292		)
Change in restricted cash related to construction projects	—			—			6,694			—			6,694
Investment in unconsolidated real estate entity	—			—			(67,525		)	—			(67,525		)
Investments in subsidiaries	(322,228		)	(291,300		)	(12,150		)	625,678			—
Additions to investments	—			—			(35,484		)	—			(35,484		)
Proceeds from sales of investments	—			—			13,883			—			13,883
Proceeds from repayment of notes receivable	—			—			29,866			—			29,866
Net cash used in investing activities	$	(322,228	)	$	(291,300	)	$	(486,489	)	$	625,678		$	(474,339	)
Condensed Consolidating Statement of Cash Flows (continued)
for the Nine Months Ended September 30, 2014
(In thousands)
(Unaudited)
	Alexandria Real			Alexandria Real			Combined			Eliminations			Consolidated
	Estate Equities,			Estate Equities,			Non-Guarantor
	Inc. (Issuer)			L.P. (Guarantor			Subsidiaries
				Subsidiary)
Financing Activities
Borrowings from secured notes payable	$	—		$	—		$	108,626		$	—		$	108,626
Repayments of borrowings from secured notes payable	—			—			(228,909		)	—			(228,909		)
Proceeds from issuance of unsecured senior notes payable	698,908			—			—			—			698,908
Principal borrowings from unsecured senior line of credit	890,000			—			—			—			890,000
Repayments of borrowings from unsecured senior line of credit	(952,000		)	—			—			—			(952,000		)
Repayment of unsecured senior bank term loan	(125,000		)	—			—			—			(125,000		)
Transfer to/from parent company	103			291,300			334,275			(625,678		)	—
Change in restricted cash related to financings	—			—			375			—			375
Deferred financing costs paid	(6,515		)	—			(1,474		)	—			(7,989		)
Dividends paid on common stock	(150,540		)	—			—			—			(150,540		)
Dividends paid on preferred stock	(19,414		)	—			—			—			(19,414		)
Contributions by noncontrolling interests	—			—			19,410			—			19,410
Distributions to noncontrolling interests	—			—			(2,594		)	—			(2,594		)
Distributions to redeemable noncontrolling interests	—			—			(893		)	—			(893		)
Net cash provided by financing activities	335,542			291,300			228,816			(625,678		)	229,980
Effect of foreign exchange rate changes on cash and cash equivalents	—			—			(1,438		)	—			(1,438		)
Net increase in cash and cash equivalents	6,665			—			2,662			—			9,327
Cash and cash equivalents at beginning of period	14,790			—			42,906			—			57,696
Cash and cash equivalents at end of period	$	21,455		$	—		$	45,568		$	—		$	67,023
Supplemental Disclosure of Cash Flow Information
Cash paid during the period for interest, net of interest capitalized	$	20,089		$	—		$	13,694		$	—		$	33,783
Non-Cash Investing Activities
Assumption of secured notes payable in connection with purchase of properties	$	—		$	—		$	(48,329	)	$	—		$	(48,329	)
Condensed Consolidating Statement of Cash Flows
for the Nine Months Ended September 30, 2013
(In thousands)
(Unaudited)
	Alexandria Real			Alexandria Real			Combined			Eliminations			Consolidated
	Estate Equities,			Estate Equities,			Non-Guarantor
	Inc. (Issuer)			L.P. (Guarantor			Subsidiaries
				Subsidiary)
Operating Activities
Net income	$	93,105		$	144,518		$	161,616		$	(303,212	)	$	96,027
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Depreciation and amortization	4,393			—			138,284			—			142,677
Loss on early extinguishment of debt	1,992			—			—			—			1,992
Gain on sale of land parcel	—			—			(772		)	—			(772		)
Loss on sale of real estate	—			—			121			—			121
Amortization of loan fees and costs	5,148			—			2,152			—			7,300
Amortization of debt premiums/discounts	75			—			308			—			383
Amortization of acquired above and below market leases	—			—			(2,490		)	—			(2,490		)
Deferred rent	—			—			(20,007		)	—			(20,007		)
Stock compensation expense	11,541			—			—			—			11,541
Equity in income related to subsidiaries	(155,694		)	(144,660		)	(2,858		)	303,212			—
Investment gains	—			(152		)	(4,564		)	—			(4,716		)
Investment losses	—			298			231			—			529
Changes in operating assets and liabilities:
Restricted cash	(8		)	—			1,251			—			1,243
Tenant receivables	1			—			(272		)	—			(271		)
Deferred leasing costs	2,421			—			(39,611		)	—			(37,190		)
Other assets	(5,570		)	—			(5,858		)	—			(11,428		)
Intercompany receivables and payables	3,021			—			(3,021		)	—			—
Accounts payable, accrued expenses, and tenant security deposits	(9,599		)	—			61,036			—			51,437
Net cash (used in) provided by operating activities	(49,174		)	4			285,546			—			236,376
Investing Activities
Proceeds from sale of properties	10,796			—			91,019			—			101,815
Additions to properties	3,539			—			(453,679		)	—			(450,140		)
Purchase of properties	—			—			(24,537		)	—			(24,537		)
Change in restricted cash related to construction projects	—			—			5,711			—			5,711
Investment in unconsolidated real estate entity	—			—			(13,881		)	—			(13,881		)
Investments in subsidiaries	(126,967		)	(170,033		)	(3,045		)	300,045			—
Additions to investments	—			—			(22,835		)	—			(22,835		)
Proceeds from sales of investments	—			1,594			11,156			—			12,750
Net cash used in investing activities	$	(112,632	)	$	(168,439	)	$	(410,091	)	$	300,045		$	(391,117	)
Condensed Consolidating Statement of Cash Flows (continued)
for the Nine Months Ended September 30, 2013
(In thousands)
(Unaudited)
	Alexandria Real			Alexandria Real			Combined			Eliminations			Consolidated
	Estate Equities,			Estate Equities,			Non-Guarantor
	Inc. (Issuer)			L.P. (Guarantor			Subsidiaries
				Subsidiary)
Financing Activities
Borrowings from secured notes payable	$	—		$	—		$	26,319		$	—		$	26,319
Repayments of borrowings from secured notes payable	—			—			(34,120		)	—			(34,120		)
Proceeds from issuance of senior notes payable	498,561			—			—			—			498,561
Principal borrowings from unsecured senior line of credit	319,000			—			—			—			319,000
Repayments of borrowings from unsecured senior line of credit	(871,000		)	—			—			—			(871,000		)
Repayments of unsecured senior bank term loans	(250,000		)	—			—			—			(250,000		)
Repurchase of unsecured senior convertible notes	(384		)	—			—			—			(384		)
Transfer to/from parent company	—			166,522			133,523			(300,045		)	—
Change in restricted cash related to financings	(1		)	—			924			—			923
Deferred financing costs paid	(14,175		)	—			(2,072		)	—			(16,247		)
Proceeds from common stock offerings	535,686			—			—			—			535,686
Dividends paid on common stock	(120,367		)	—			—			—			(120,367		)
Dividends paid on preferred stock	(19,414		)	—			—			—			(19,414		)
Distributions to noncontrolling interests	—			—			(2,100		)	—			(2,100		)
Net cash provided by financing activities	77,906			166,522			122,474			(300,045		)	66,857
Effect of foreign exchange rate changes on cash and cash equivalents	—			—			752			—			752
Net decrease in cash and cash equivalents	(83,900		)	(1,913		)	(1,319		)	—			(87,132		)
Cash and cash equivalents at beginning of period	98,567			1,913			40,491			—			140,971
Cash and cash equivalents at end of period	$	14,667		$	—		$	39,172		$	—		$	53,839
Supplemental Disclosure of Cash Flow Information
Cash paid during the period for interest, net of interest capitalized	$	16,569		$	—		$	17,712		$	—		$	34,281
Non-Cash Investing Activities
Note receivable issued in connection with sale of real estate	$	29,820		$	—		$	9,000		$	—		$	38,820

Basis_of_presentation_Policies

Basis of presentation (Policies)	9 Months Ended
	Sep. 30, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Basis of presentation	'
	Consolidation
	The accompanying consolidated financial statements include the accounts of Alexandria Real Estate Equities, Inc. and its consolidated subsidiaries. All significant intercompany balances and transactions have been eliminated. In certain circumstances, we may enter into joint venture arrangements with outside partners. On a quarterly basis, we evaluate each JV arrangement under the VIE model and if the entity is determined not to be a VIE, then we evaluate the entity under the voting model to determine if the entity should be consolidated.
	Under the VIE model an entity is determined to be a VIE if it has any of the following characteristics:
	•	the entity does not have enough equity to finance its activities without additional subordinated financial support;
	•	the equity holders, as a group, lack the characteristics of a controlling financial interest, or
	•	the legal entity is established with non-substantive voting rights.
	If an entity is determined to be a VIE, we evaluate whether we are the primary beneficiary. We perform this evaluation on a quarterly basis. We use qualitative analyses when determining whether or not we are the primary beneficiary of a VIE. Factors considered include, but are not limited to, the purpose and design of the VIE, risks that the VIE was designed to create and pass through, the form of our ownership interest, our representation on the entity’s governing body, the size and seniority of our investment, our ability to participate in policy-making decisions, and the rights of the other investors to participate in the decision-making process and/or liquidate the venture, if applicable. We consolidate VIEs whenever we determine that we are the primary beneficiary.
	If an entity is determined not to be a VIE, we then evaluate such entity under the voting model. Under the voting model, if we are the general partner, managing member, or a similar role that can direct the operations of the entity, we have a presumption that we control the entity and we should consolidate regardless of our ownership percentage. If we determine that the other equity holders have any one of the following rights, it is assumed that we do not control the entity and therefore should not consolidate the entity: (i) the substantive ability to dissolve the entity or remove us from the lead role of the entity, or (ii) substantive rights that allow them to participate in the activities that most significantly impact the entity’s economic performance.
	As of September 30, 2014, we have two joint ventures that do not meet the requirements for consolidation and are accounted for under the equity method of accounting. See Note 3 – Investments in Real Estate, to our consolidated financial statements (unaudited) appearing elsewhere in this quarterly report on Form 10-Q for further information on our unconsolidated real estate entities.
Reclassifications	'
	Reclassifications
	Certain prior period amounts have been reclassified to conform to the current period presentation for discontinued operations.
Use of estimates	'
	Use of estimates
	The preparation of consolidated financial statements in conformity with GAAP requires us to make estimates and assumptions that affect the reported amounts of assets, liabilities, and equity; the disclosure of contingent assets and liabilities as of the date of the consolidated financial statements; and the amounts of revenues and expenses during the reporting period.  Actual results could materially differ from those estimates.
Investments in real estate, net, and discontinued operations	'
	Investments in real estate, net, and discontinued operations
	We recognize real estate acquired (including the intangible value of above or below market leases, acquired in-place leases, client tenant relationships, and other intangible assets or liabilities), liabilities assumed, and any noncontrolling interest in an acquired entity at their fair value as of the acquisition date.  If there is a bargain fixed-rate renewal option for the period beyond the non-cancelable lease term, we evaluate factors such as the business conditions in the industry in which the lessee operates, the economic conditions in the area in which the property is located, and the ability of the lessee to sublease the property during the renewal term, in order to determine the likelihood that the lessee will renew.  When we determine there is reasonable assurance that such bargain purchase option will be exercised, we consider its impact in determining the intangible value of such lease and its related amortization period.  The value of tangible assets acquired is based upon our estimation of value on an “as if vacant” basis.  The value of acquired in-place leases includes the estimated costs during the hypothetical lease-up period and other costs that would have been incurred in the execution of similar leases, considering market conditions at the acquisition date of the acquired in-place lease.  We assess the fair value of tangible and intangible assets based on numerous factors, including estimated cash flow projections that utilize appropriate discount and capitalization rates and available market information.  Estimates of future cash flows are based on a number of factors, including the historical operating results, known trends, and market/economic conditions that may affect the property.  We also recognize the fair values of assets acquired, the liabilities assumed, and any noncontrolling interest in acquisitions of less than a 100% interest when the acquisition constitutes a change in control of the acquired entity.  Costs related to the acquisition of businesses, including real estate acquired with in-place leases, are expensed as incurred.
	The values allocated to buildings and building improvements, land improvements, tenant improvements, and equipment are depreciated on a straight-line basis using the shorter of the term of the respective ground lease and up to 40 years for buildings and building improvements, an estimated life of 20 years for land improvements, the respective lease term for TIs, and the estimated useful life for equipment. The values of acquired above and below market leases are amortized over the lives of the related leases and recognized as either an increase (for below market leases) or a decrease (for above market leases) to rental income. The values of acquired in-place leases are classified in other assets in the accompanying consolidated balance sheets, and amortized over the remaining terms of the related leases.
	We are required to capitalize project costs, including predevelopment costs, interest, property taxes, insurance, and other costs directly related and essential to the acquisition, development, redevelopment, predevelopment, or construction of a project.  Capitalization of development, redevelopment, predevelopment, and construction costs is required while activities are ongoing to prepare an asset for its intended use.  Fluctuations in our development, redevelopment, predevelopment, and construction activities could result in significant changes to total expenses and net income.  Costs incurred after a project is substantially complete and ready for its intended use are expensed as incurred.  Should development, redevelopment, predevelopment, or construction activities cease, interest, property taxes, insurance, and certain other costs would no longer be eligible for capitalization and would be expensed as incurred.  Expenditures for repairs and maintenance are expensed as incurred.
	A property is classified as “held for sale” when all of the following criteria for a plan of sale have been met: (i) management, having the authority to approve the action, commits to a plan to sell the property; (ii) the property is available for immediate sale in its present condition, subject only to terms that are usual and customary; (iii) an active program to locate a buyer and other actions required to complete the plan to sell have been initiated; (iv) the sale of the property is probable (including the removal of significant contingencies or the fulfillment of significant conditions precedent to the sale) and is expected to be completed within one year; (v) the property is being actively marketed for sale at a price that is reasonable in relation to its current fair value; and (vi) actions necessary to complete the plan of sale indicate that it is unlikely that significant changes to the plan will be made or that the plan will be withdrawn.  When all of these criteria have been met, the property is classified as “held for sale,” and if (i) the operations and cash flows of the property have been or will be eliminated from the ongoing operations, and (ii) we will not have any significant continuing involvement in the operations of the property after the sale, then its operations, including any interest expense directly attributable to it, are classified as discontinued operations in our consolidated statements of income, and amounts for all prior periods presented are reclassified from continuing operations to discontinued operations.  Depreciation of assets ceases upon designation of a property as “held for sale.”
Impairment of long-lived assets	'
	Impairment of long-lived assets
	Long-lived assets to be held and used, including our rental properties, land held for development, CIP, and intangibles, are individually evaluated for impairment when conditions exist that may indicate that the amount of a long-lived asset may not be recoverable.  The amount of a long-lived asset to be held and used is not recoverable if it exceeds the sum of the undiscounted cash flows expected to result from the use and eventual disposition of the asset.  Impairment indicators or triggering events for long-lived assets to be held and used, including our rental properties, land held for development, and CIP, are assessed by project and include significant fluctuations in estimated NOI, occupancy changes, significant near-term lease expirations, current and historical operating and/or cash flow losses, construction costs, estimated completion dates, rental rates, and other market factors.  We assess the expected undiscounted cash flows based upon numerous factors, including, but not limited to, construction costs, available market information, current and historical operating results, known trends, current market/economic conditions that may affect the property, and our assumptions about the use of the asset, including, if necessary, a probability-weighted approach if multiple outcomes are under consideration.  Upon determination that an impairment has occurred, a write-down is recognized to reduce the carrying amount to its estimated fair value.  If an impairment loss is not required to be recognized, the recognition of depreciation is adjusted prospectively, as necessary, to reduce the carrying amount of the real estate to its estimated disposition value over the remaining period that the real estate is expected to be held and used.  We may adjust depreciation of properties that are expected to be disposed of or redeveloped prior to the end of their useful lives.
	We use the “held for sale” impairment model for our properties classified as held for sale.  The held for sale impairment model is different from the held and used impairment model.  Under the held for sale impairment model, an impairment loss is recognized if the amount of the long-lived asset classified as held for sale exceeds its fair value less cost to sell.  Because of these two different models, it is possible for a long-lived asset, previously classified to be held and used, to require the recognition of an impairment charge upon classification as held for sale.
Investments	'
	Investments
	We hold equity investments in certain publicly traded companies and investments in certain privately held entities primarily involved in the life science industry.  All of our investments in actively traded public companies are considered “available for sale” and are reflected in the accompanying consolidated balance sheets at fair value.  Fair value has been determined based upon the closing price as of each balance sheet date, with unrealized gains and losses shown as a separate component of comprehensive income.  The classification of each investment is determined at the time each investment is made, and such determination is reevaluated at each balance sheet date.  The cost of each investment sold is determined by the specific identification method, with realized gains or losses classified in other income in the accompanying consolidated statements of income.  Investments in privately held entities and limited partnerships are generally accounted for under the cost method when our interest in the entity is so minor that we have virtually no influence over the entity’s operating and financial policies.  Certain investments in privately held entities and limited partnerships are accounted for under the equity method when our interest in the entity is not deemed so minor that we have virtually no influence over the entity’s operating and financial policies.  Under the equity method of accounting, we recognize our investment initially at cost and adjust the amount of the investment to recognize our share of the earnings or losses of the investee subsequent to the date of our investment.  Additionally, we limit our ownership percentage in the voting interest of each individual entity to less than 10%.  As of September 30, 2014, and December 31, 2013, our ownership percentage in the voting interest of each individual entity was less than 10%.
	We monitor each of our investments throughout the year for new developments, including operating results, results of clinical trials, capital-raising events, and merger and acquisition activities. Individual investments are evaluated for impairment when changes in conditions may indicate an impairment exists.  The factors that we consider in making these assessments include, but are not limited to, market prices, market conditions, available financing, prospects for favorable or unfavorable clinical trial results, new product initiatives, and new collaborative agreements.  If there are no identified events or changes in circumstances that would have an adverse effect on our cost method investments, we do not estimate the investment’s fair value.  For all of our investments, if a decline in the fair value of an investment below the carrying value is determined to be other than temporary, such investment is written down to its estimated fair value with a charge to current earnings.
Income Taxes	'
	Income taxes
	We are organized and qualify as a REIT pursuant to the Internal Revenue Code of 1986, as amended (the “Code”).  Under the Code, a REIT that distributes 100% of its REIT taxable income as a dividend to its shareholders each year and that meets certain other conditions is not subject to federal income taxes, but could be subject to certain state and local taxes.  We have distributed 100% or more of our taxable income.  Therefore, no provision for federal income taxes is required.  We file tax returns, including returns for our subsidiaries, with federal, state, and local jurisdictions, including jurisdictions located in the U.S., Canada, India, China, and other international locations.  Our tax returns are subject to examination in various jurisdictions for the calendar years 2009 through 2013.
Recognition of rental income and tenant recoveries	'
	Recognition of rental income and tenant recoveries
	Rental income from leases is recognized on a straight-line basis over the respective lease terms.  We classify amounts currently recognized as income, and expected to be received in later years, as an asset in deferred rent in the accompanying consolidated balance sheets.  Amounts received currently, but recognized as income in future years, are classified in accounts payable, accrued expenses, and tenant security deposits in the accompanying consolidated balance sheets.  We commence recognition of rental income at the date the property is ready for its intended use and the client tenant takes possession of or controls the physical use of the property.
	Tenant recoveries related to reimbursement of real estate taxes, insurance, utilities, repairs and maintenance, and other operating expenses are recognized as revenue in the period during which the applicable expenses are incurred.
	Tenant receivables consist primarily of amounts due for contractual lease payments, reimbursements of common area maintenance expenses, property taxes, and other expenses recoverable from client tenants.  Tenant receivables are expected to be collected within one year.  We may maintain an allowance for estimated losses that may result from the inability of our client tenants to make payments required under the terms of the lease and for tenant recoveries due.  If a client tenant fails to make contractual payments beyond any allowance, we may recognize additional expense for uncollectible accounts in future periods equal to the amount of uncollectible rent and tenant recoveries, and deferred rent receivables arising from the straight-lining of rent.  As of September 30, 2014, and December 31, 2013, we had no allowance for uncollectible receivables.
Monitoring client tenant credit quality	'
	Monitoring client tenant credit quality
	During the term of each lease, we monitor the credit quality of our client tenants by (i) reviewing the credit rating of tenants that are rated by a nationally recognized credit rating agency, (ii) reviewing financial statements of the client tenants that are publicly available or that are required to be delivered to us pursuant to the applicable lease, (iii) monitoring news reports regarding our tenants and their respective businesses, (iv) monitoring the timeliness of lease payments, and (v) periodically meeting with our client tenants’ senior management. We have a team of employees who, among them, have graduate and undergraduate degrees in biology, chemistry, and industrial biotechnology and experience in the life science industry, as well as in finance. This research team is responsible for assessing and monitoring their credit quality and any material changes in credit quality.
Interest income	'
	Interest and other income
	Interest and other income was $2.0 million and $1.2 million during the three months ended September 30, 2014 and 2013, respectively. Interest and other income was $3.8 million and $3.5 million during the nine months ended September 30, 2014 and 2013, respectively.  Interest and other income is included in other income in the accompanying consolidated statements of income.
Impact of recently issued accounting standards	'
	Impact of recently issued accounting standards
	In April 2014, the FASB issued an ASU on the reporting of discontinued operations which raises the threshold for disposals to qualify as discontinued operations. Under this ASU, a discontinued operation is (i) a component of an entity or group of components that has been disposed of by sale, that has been disposed of other than by sale, or that is classified as “held for sale” and represents a strategic shift that has had or will have a major effect on an entity’s operations and financial results or (ii) an acquired business or non-profit activity that is classified as “held for sale” on the date of the acquisition. A strategic shift that has or will have a major effect on an entity’s operations and financial results could include the disposal of (i) a major line of business, (ii) a major geographic area, (iii) a major equity method investment, or (iv) other major parts of an entity. Under current GAAP, an entity is prohibited from reporting a discontinued operation if it has certain continuing cash flows or involvement with the component after the disposal. This ASU eliminates these criteria and is effective for public companies during the interim and annual periods, beginning after December 15, 2014. We are required to adopt this ASU no later than January 1, 2015, and may early adopt this ASU during interim periods, as applicable. We expect the adoption of this ASU to result in fewer real estate sales qualifying for classification as discontinued operations in our consolidated financial statements.
	In May 2014, the FASB issued an ASU that replaces substantially all industry-specific revenue recognition requirements and converges areas under this topic with International Financial Reporting Standards. The ASU implements a five-step process for customer contract revenue recognition that focuses on transfer of control, as opposed to transfer of risk and rewards. The ASU also requires enhanced disclosures regarding the nature, amount, timing, and uncertainty of revenues and cash flows from contracts with customers. Other major provisions in this ASU include capitalizing and amortizing certain contract costs, ensuring the time value of money is considered in the applicable transaction price, and allowing estimates of variable consideration to be recognized before contingencies are resolved in certain circumstances. Entities can transition to the standard either retrospectively or as a cumulative-effect adjustment as of the date of adoption. The ASU is effective for reporting periods beginning after December 15, 2016, and early adoption is prohibited. The ASU does not apply to lease contracts accounted for under current GAAP. We are currently evaluating the impact of the adoption of this ASU will have on our financial position and results of operations.

Background_Tables

Background (Tables)	9 Months Ended
	Sep. 30, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Schedule of Square Feet by Property [Table Text Block]	'
	Our asset base consisted of the following, as of September 30, 2014:
		Square Feet
	Operating properties	16,373,416
	Development properties	1,941,186
	Redevelopment properties	143,777
	Total operating and current value-creation projects	18,458,379
	Near-term value-creation projects in North America (CIP)	1,926,331
	Future value-creation projects	10,983,108
	Land under sales contract	250,000
	Total	31,617,818

Investments_in_real_estate_net1

Investments in real estate, net (Tables)	9 Months Ended
	Sep. 30, 2014
Real Estate [Abstract]	'
Investments in real estate	'
	Our investments in real estate consisted of the following as of September 30, 2014, and December 31, 2013 (in thousands):
		30-Sep-14			31-Dec-13
	Rental properties	$	6,849,966		$	6,442,208
	CIP/current value-creation projects:
	Current development in North America	532,053			511,838
	Current redevelopment in North America	32,661			8,856
	Current development in Asia	35,602			60,928
		600,316			581,622
	Near-term value-creation projects in North America (CIP):
	50, 60, and 100 Binney Street	313,379			284,672
	Other projects	90,843			97,617
		404,222			382,289
	Future value-creation projects:
	North America	221,572			176,063
	Asia	78,319			77,251
		299,891			253,314
	Land under sales contract	12,236			22,943
	Near-term and future value-creation projects	716,349			658,546
	Gross investments in real estate	8,166,631			7,682,376
	Less: accumulated depreciation	(1,083,169		)	(952,106		)
	Equity method of accounting – unconsolidated JV	114,168			46,644
	Investments in real estate	$	7,197,630		$	6,776,914

Investments_Tables

Investments (Tables)	9 Months Ended
	Sep. 30, 2014
Investments [Abstract]	'
Summary of investments	'
	The following table summarizes our investments as of September 30, 2014, and December 31, 2013 (in thousands):
		30-Sep-14				31-Dec-13
	“Available-for-sale” marketable equity securities, cost basis	$	15,119			$	2,879
	Unrealized gains	17,150			(1)	2,177
	Unrealized losses	(1,452		)		(587		)
	“Available-for-sale” marketable equity securities, at fair value	30,817				4,469
	Investments accounted for under cost method	146,760				135,819
	Total investments	$	177,577			$	140,288
	-1	The increase in our investments during the nine months ended September 30, 2014, includes an increase in unrealized gains of approximately $13.6 million related to our investments in publicly traded life science companies. These unrealized gains are a component of our comprehensive income, within our stockholders’ equity, and have not been recognized in the accompanying consolidated statement of income for the nine months ended September 30, 2014.
Schedule of net investment income	'
	The following table outlines our investment (loss) income, which is classified in other income in the accompanying consolidated statements of income (in thousands):
		Three Months Ended September 30,							Nine Months Ended September 30,
		2014				2013			2014			2013
	Investment gains	$	3,256			$	2,050		$	9,481		$	4,716
	Investment losses	(3,485		)		—			(8,725		)	(529		)
	Investment (loss) income	$	(229	)		$	2,050		$	756		$	4,187

Secured_and_unsecured_senior_d1

Secured and unsecured senior debt (Tables)	9 Months Ended
	Sep. 30, 2014
Debt Disclosure [Abstract]	'
Summary of secured and unsecured debt	'
	The following table summarizes our secured and unsecured senior debt as of September 30, 2014 (dollars in thousands):
		Fixed Rate/Hedged				Unhedged				Total				Percentage of Total Debt			Weighted Average			Weighted Average
		Variable Rate				Variable Rate				Consolidated							Interest Rate at			Remaining Term
																	End of Period (1)			(in years)
	Secured notes payable	$	406,125			$	230,700			$	636,825			18.2	%		4.67	%		2.9
	Unsecured senior notes payable	1,747,290				—				1,747,290				49.9			3.98			8.6
	$1.5 billion unsecured senior line of credit	—				142,000				142,000				4.1			1.25			4.3
	2016 Unsecured Senior Bank Term Loan	350,000				25,000				375,000				10.7			1.42			1.8
	2019 Unsecured Senior Bank Term Loan	600,000				—				600,000				17.1			2.05			4.3
	Total/weighted average	$	3,103,415			$	397,700			$	3,501,115			100	%		3.39	%		5.9
	Percentage of total debt	89		%		11		%		100		%
	-1	Represents the weighted average interest rate as of the end of the period plus the impact of debt premiums/discounts and our interest rate swap agreements. The weighted average interest rate excludes bank fees and amortization of loan fees.
Detail of secured and unsecured debt	'
	The following table summarizes our outstanding indebtedness and respective principal maturities as of
	September 30, 2014 (dollars in thousands):
			Stated			Weighted Average			Maturity Date(2)		Principal Payments Remaining for the Period Ending December 31,
	Debt		Rate			Interest Rate(1)					2014				2015				2016			2017			2018			Thereafter			Total
	Secured notes payable
	Seattle		6	%		6	%		11/18/14		$	60			$	—			$	—		$	—		$	—		$	—		$	60
	Maryland		5.64			4.5			6/1/15		34				5,777				—			—			—			—			5,811
	San Francisco Bay Area		L+1.50			1.66			7/1/15		—				46,596				—			—			—			—			46,596
	Greater Boston, San Francisco Bay Area, and San Diego		5.73			5.73			1/1/16		440				1,816				75,501			—			—			—			77,757
	Greater Boston, San Diego, and New York City		5.82			5.82			4/1/16		234				988				29,389			—			—			—			30,611
	San Diego		5.74			3			4/15/16		42				175				6,916			—			—			—			7,133
	San Francisco Bay Area		L+1.40			1.56			6/1/16		—				—				17,952			—			—			—			17,952
	San Francisco Bay Area		6.35			6.35			8/1/16		619				2,652				126,715			—			—			—			129,986
	Maryland		2.14			2.14			1/20/17		—				—				—			76,000			—			—			76,000
	Greater Boston		L+1.35			1.5			8/23/17		—				—				—			90,092			—			—			90,092
	San Diego, Maryland, and Seattle		7.75			7.75			4/1/20		374				1,570				1,696			1,832			1,979			106,490			113,941
	San Diego		4.66			4.66			1/1/23		337				1,402				1,464			1,540			1,614			33,367			39,724
	San Francisco Bay Area		6.5			6.5			6/1/37		—				18				19			20			22			751			830
	Unamortized premiums										54				218				60			—			—			—			332
	Secured notes payable average/subtotal		4.71	%		4.67					2,194				61,212				259,712			169,484			3,615			140,608			636,825
	2016 Unsecured Senior Bank Term Loan		L+1.20	%		1.42			7/31/16		—				—				375,000			—			—			—			375,000
	2019 Unsecured Senior Bank Term Loan		L+1.20	%		2.05			1/3/19		—				—				—			—			—			600,000			600,000
	$1.5 billion unsecured senior line of credit		L+1.10	%	(3)	1.25			1/3/19		—				—				—			—			—			142,000			142,000
	Unsecured senior notes payable		2.75	%		2.79			1/15/20		—				—				—			—			—			400,000			400,000
	Unsecured senior notes payable		4.6	%		4.61			4/1/22		—				—				—			—			—			550,000			550,000
	Unsecured senior notes payable		3.9	%		3.94			6/15/23		—				—				—			—			—			500,000			500,000
	Unsecured senior notes payable		4.5	%		4.51			7/30/29		—				—				—			—			—			300,000			300,000
	Unamortized discounts										(79		)		(326		)		(337		)	(350		)	(362		)	(1,256		)	(2,710		)
	Unsecured debt average/subtotal					3.11					(79		)		(326		)		374,663			(350		)	(362		)	2,490,744			2,864,290
	Average/total					3.39	%				$	2,115			$	60,886			$	634,375		$	169,134		$	3,253		$	2,631,352		$	3,501,115
	Balloon payments										$	—			$	52,336			$	629,851		$	166,092		$	—		$	2,622,238		$	3,470,517
	Principal amortization										2,115				8,550				4,524			3,042			3,253			9,114			30,598
	Total consolidated debt										$	2,115			$	60,886			$	634,375		$	169,134		$	3,253		$	2,631,352		$	3,501,115
	Fixed-rate/hedged variable-rate debt										$	2,055			$	14,290			$	591,423		$	3,042		$	3,253		$	2,489,352		$	3,103,415
	Unhedged variable-rate debt										60				46,596				42,952			166,092			—			142,000			397,700
	Total consolidated debt										$	2,115			$	60,886			$	634,375		$	169,134		$	3,253		$	2,631,352		$	3,501,115
	-1	Represents the weighted average interest rate as of the end of the period plus the impact of debt premiums/discounts and our interest rate swap agreements. The weighted average interest rate excludes bank fees and amortization of loan fees.
	-2	Includes any extension options that we control.
	-3	In addition to the stated rate, the unsecured senior line of credit is subject to an annual facility fee of 0.20%.
Schedule of interest expense	'
	The following table summarizes interest expense for the three and nine months ended September 30, 2014 and 2013 (in thousands):
		Three Months Ended September 30,								Nine Months Ended September 30,
		2014				2013				2014				2013
	Gross interest	$	32,680			$	32,959			$	92,551			$	96,668
	Capitalized interest	(12,125		)		(16,788		)		(35,440		)		(46,499		)
	Interest expense	$	20,555			$	16,171			$	57,111			$	50,169
Schedule of secured construction loans	'
	The following table summarizes our secured construction loans as of September 30, 2014 (dollars in thousands):
	Market		Stated Rate				Maturity Date				Outstanding Balance				Remaining Commitments				Total Aggregate Commitments
	San Francisco Bay Area			L+1.50	%		7/1/15		(1)		$	46,596			$	8,404			$	55,000
	San Francisco Bay Area			L+1.40	%		6/1/16		(2)		17,952				18,048				36,000
	Greater Boston			L+1.35	%		8/23/17		(3)		90,092				160,308				250,400
											$	154,640			$	186,760			$	341,400
	-1	We have two, one-year options to extend the stated maturity date to July 1, 2017, subject to certain conditions.
	-2	We have two, one-year options to extend the stated maturity date to June 1, 2018, subject to certain conditions.
	-3	We have a one-year option to extend the stated maturity date to August 23, 2018, subject to certain conditions.

Interest_rate_swap_agreements_

Interest rate swap agreements (Tables)	9 Months Ended
	Sep. 30, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Outstanding interest rate hedge agreements designated as cash flow hedges of interest rate risk	'
	We had the following outstanding interest rate swap agreements that were designated as cash flow hedges of interest rate risk as of September 30, 2014 (dollars in thousands):
	Effective Date		Maturity Date	Number of Contracts	Weighted Average Interest Pay	Fair Value as of 9/30/14			Notional Amount in Effect as of
					Rate (1)				9/30/14		12/31/14		12/31/15		12/31/16
	31-Dec-13		31-Dec-14	2	0.98%	$	(1,051	)	$	500,000	$	—	$	—	$	—
	31-Dec-13		31-Mar-15	2	0.23%	(110		)	250,000		250,000		—		—
	31-Mar-14		31-Mar-15	4	0.21%	(61		)	200,000		200,000		—		—
	31-Dec-14		31-Mar-16	3	0.53%	(23		)	—		500,000		500,000		—
	31-Mar-16		31-Mar-17	3	1.40%	958			—		—		—		500,000
	Total					$	(287	)	$	950,000	$	950,000	$	500,000	$	500,000
	-1	In addition to the interest pay rate, borrowings outstanding as of September 30, 2014, under our unsecured senior bank term loans include an applicable margin of 1.20% and borrowings outstanding under our unsecured senior line of credit include an applicable margin of 1.10%.

Fair_value_measurements_Tables

Fair value measurements (Tables)	9 Months Ended
	Sep. 30, 2014
Fair Value Disclosures [Abstract]	'
Schedule of fair value of assets and liabilities measured at fair value on a recurring basis by level within the fair value hierarchy	'
	The following tables set forth the assets and liabilities that we measure at fair value on a recurring basis by level within the fair value hierarchy as of September 30, 2014, and December 31, 2013 (in thousands):
						30-Sep-14
	Description		Total			Quoted Prices in			Significant			Significant
						Active Markets			Other			Unobservable
						for Identical			Observable			Inputs
						Assets			Inputs
	Assets:
	“Available-for-sale” securities		$	30,817		$	30,817		$	—		$	—
	Interest rate swap agreements		$	958		$	—		$	958		$	—
	Liabilities:
	Interest rate swap agreements		$	1,245		$	—		$	1,245		$	—
						31-Dec-13
	Description		Total			Quoted Prices in			Significant			Significant
						Active Markets			Other			Unobservable
						for Identical			Observable			Inputs
						Assets			Inputs
	Assets:
	“Available-for-sale” securities		$	4,469		$	4,469		$	—		$	—
	Interest rate swap agreements		$	2,870		$	—		$	2,870		$	—
	Liabilities:
	Interest rate swap agreements		$	6,191		$	—		$	6,191		$	—
Schedule of the book and fair values of our marketable securities, interest rate swap agreements, secured notes payable, unsecured senior notes payable, unsecured senior line of credit, and unsecured senior bank term loan	'
	As of September 30, 2014, and December 31, 2013, the book and fair values of our “available-for-sale” marketable equity securities, interest rate swap agreements, secured notes payable, unsecured senior notes payable, unsecured senior line of credit, and unsecured senior bank term loans were as follows (in thousands):
		30-Sep-14						31-Dec-13
		Book Value			Fair Value			Book Value			Fair Value
	Assets:
	“Available-for-sale” marketable equity securities	$	30,817		$	30,817		$	4,469		$	4,469
	Interest rate swap agreements	$	958		$	958		$	2,870		$	2,870
	Liabilities:
	Interest rate swap agreements	$	1,245		$	1,245		$	6,191		$	6,191
	Secured notes payable	$	636,825		$	686,388		$	708,831		$	736,772
	Unsecured senior notes payable	$	1,747,290		$	1,775,990		$	1,048,230		$	1,043,125
	Unsecured senior line of credit	$	142,000		$	141,881		$	204,000		$	193,714
	Unsecured senior bank term loans	$	975,000		$	974,424		$	1,100,000		$	1,099,897

Earnings_per_share_Tables

Earnings per share (Tables)	9 Months Ended
	Sep. 30, 2014
Earnings Per Share [Abstract]	'
Reconciliation of the numerators and denominators of the basic and diluted earnings per share computations	'
	The table below is a reconciliation of the numerators and denominators of the basic and diluted EPS computations for the three and nine months ended September 30, 2014 and 2013 (dollars in thousands, except per share amounts):
		Three Months Ended September 30,						Nine Months Ended September 30,
		2014			2013			2014			2013
	Income from continuing operations	$	36,115		$	32,496		$	112,492		$	94,212
	Gain on sales of land parcels	8			—			805			772
	Dividends on preferred stock	(6,471		)	(6,472		)	(19,414		)	(19,414		)
	Net income attributable to noncontrolling interests	(1,340		)	(960		)	(3,842		)	(2,922		)
	Net income attributable to unvested restricted stock awards	(506		)	(442		)	(1,285		)	(1,187		)
	Income from continuing operations attributable to Alexandria’s common stockholders – basic and diluted	27,806			24,622			88,756			71,461
	(Loss) income from discontinued operations	(180		)	(43		)	(489		)	1,043
	Net income attributable to Alexandria’s common stockholders – basic and diluted	$	27,626		$	24,579		$	88,267		$	72,504
	Weighted average shares of common stock outstanding – basic and diluted	71,195			70,900			71,121			67,040
	EPS attributable to Alexandria’s common stockholders – basic and diluted:
	Continuing operations	$	0.39		$	0.35		$	1.25		$	1.06
	Discontinued operations	—			—			(0.01		)	0.02
	EPS – basic and diluted	$	0.39		$	0.35		$	1.24		$	1.08

Stockholders_equity_Tables

Stockholders' equity (Tables)	9 Months Ended
	Sep. 30, 2014
Stockholders' Equity Note [Abstract]	'
Accumulated other comprehensive loss attributable to Alexandria Real Estate Equities, Inc.	'
	Accumulated other comprehensive loss
	Accumulated other comprehensive loss attributable to Alexandria Real Estate Equities, Inc. consists of the following (in thousands):
		Unrealized Gain on Marketable Securities		Unrealized Loss on Interest Rate Swap Agreements			Unrealized Loss on Foreign Currency Translation			Total
	Balance as of December 31, 2013	$	1,590	$	(3,321	)	$	(34,473	)	$	(36,204	)
	Other comprehensive income (loss) before reclassifications	13,591		(2,708		)	(9,450		)	1,433
	Amounts reclassified from other comprehensive income (loss)	517		5,742			(199		)	6,060
	Net other comprehensive income (loss)	14,108		3,034			(9,649		)	7,493
	Balance as of September 30, 2014	$	15,698	$	(287	)	$	(44,122	)	$	(28,711	)

Noncontrolling_interests_Nonco

Noncontrolling interests Noncontrolling Interests (Tables)	9 Months Ended
	Sep. 30, 2014
Noncontrolling Interest [Abstract]	'
Income from continuing operations and discontinued operations attributable to Alexandria Real Estate Equities, Inc. excluding amounts attributable to noncontrolling interests [Table Text Block]	'
	The following table represents income from continuing operations and discontinued operations attributable to Alexandria Real Estate Equities, Inc., for the three and nine months ended September 30, 2014 and 2013, excluding the amounts attributable to these noncontrolling interests:
		Three Months Ended September 30,				Nine Months Ended September 30,
		2014		2013		2014		2013
	Income from continuing operations attributable to Alexandria Real Estate Equities, Inc.	34,775		31,536		108,650		91,290
	(Loss) income from discontinued operations	(180	)	(43	)	(489	)	1,043

Discontinued_operations_Tables

Discontinued operations (Tables)	9 Months Ended
	Sep. 30, 2014
Discontinued Operations and Disposal Groups [Abstract]	'
Summary of net assets of discontinued operations and (loss) income from discontinued operations, net	'
	The following is a summary of net assets of discontinued operations and (loss) income from discontinued operations (in thousands):
		September 30, 2014				December 31, 2013
	Properties “held for sale,” net	$	7,648			$	7,644
	Other assets	20				103
	Total assets	7,668				7,747
	Total liabilities	(172		)		(266		)
	Net assets of discontinued operations	$	7,496			$	7,481
			Three Months Ended September 30,							Nine Months Ended September 30,
			2014				2013			2014			2013
	Total revenues		$	—			$	319		$	—		$	4,658
	Operating expenses		180				126			489			1,856
	Total revenues less operating expenses from discontinued operations		(180		)		193			(489		)	2,802
	Depreciation expense		—				236			—			1,638
	Loss on sale of real estate		—				—			—			121
	(Loss) income from discontinued operations (1)		$	(180	)		$	(43	)	$	(489	)	$	1,043
	-1	(Loss) income from discontinued operations includes the results of operations of four properties that were classified as “held for sale” as of September 30, 2014, as well as the results of operations (prior to disposition) and gain on sale of real estate attributable to seven properties sold during the period from January 1, 2013, to September 30, 2014. In October 2014, we completed the sale of one property which was classified as “held for sale” as of September 30, 2014.

Condensed_consolidating_financ1

Condensed consolidating financial information (Tables)	9 Months Ended
	Sep. 30, 2014
Condensed Consolidated Financial Information [Abstract]	'
Condensed consolidating balance sheet	'
	Consolidating Balance Sheet
	as of September 30, 2014
	(In thousands)
	(Unaudited)
		Alexandria Real Estate Equities, Inc.			Alexandria			Combined			Eliminations			Consolidated
		(Issuer)			Real Estate			Non-
					Equities, L.P.			Guarantor
					(Guarantor			Subsidiaries
					Subsidiary)
	Assets
	Investments in real estate	$	—		$	—		$	7,197,630		$	—		$	7,197,630
	Cash and cash equivalents	21,455			—			45,568			—			67,023
	Restricted cash	70			—			24,175			—			24,245
	Tenant receivables	—			—			10,830			—			10,830
	Deferred rent	—			—			225,506			—			225,506
	Deferred leasing and financing costs	37,486			—			162,349			—			199,835
	Investments	—			8,147			169,430			—			177,577
	Investments in and advances to affiliates	6,812,172			6,291,506			129,268			(13,232,946		)	—
	Other assets	19,244			—			98,424			—			117,668
	Total assets	$	6,890,427		$	6,299,653		$	8,063,180		$	(13,232,946	)	$	8,020,314
	Liabilities, Noncontrolling Interests, and Equity
	Secured notes payable	$	—		$	—		$	636,825		$	—		$	636,825
	Unsecured senior notes payable	1,747,290			—			—			—			1,747,290
	Unsecured senior line of credit	142,000			—			—			—			142,000
	Unsecured senior bank term loans	975,000			—			—			—			975,000
	Accounts payable, accrued expenses, and tenant security deposits	93,679			—			410,856			—			504,535
	Dividends payable	57,260			—			289			—			57,549
	Total liabilities	3,015,229			—			1,047,970			—			4,063,199
	Redeemable noncontrolling interests	—			—			14,348			—			14,348
	Alexandria Real Estate Equities, Inc.’s stockholders’ equity	3,875,198			6,299,653			6,933,293			(13,232,946		)	3,875,198
	Noncontrolling interests	—			—			67,569			—			67,569
	Total equity	3,875,198			6,299,653			7,000,862			(13,232,946		)	3,942,767
	Total liabilities, noncontrolling interests, and equity	$	6,890,427		$	6,299,653		$	8,063,180		$	(13,232,946	)	$	8,020,314
	Condensed Consolidating Balance Sheet
	as of December 31, 2013
	(In thousands)
	(Unaudited)
		Alexandria			Alexandria			Combined			Eliminations			Consolidated
		Real Estate			Real Estate			Non-
		Equities, Inc.			Equities, L.P.			Guarantor
		(Issuer)			(Guarantor			Subsidiaries
					Subsidiary)
	Assets
	Investments in real estate	$	—		$	—		$	6,776,914		$	—		$	6,776,914
	Cash and cash equivalents	14,790			—			42,906			—			57,696
	Restricted cash	55			—			27,654			—			27,709
	Tenant receivables	—			—			9,918			—			9,918
	Deferred rent	—			—			190,425			—			190,425
	Deferred leasing and financing costs	36,901			—			155,757			—			192,658
	Investments	—			10,868			129,420			—			140,288
	Investments in and advances to affiliates	6,299,551			5,823,058			119,421			(12,242,030		)	—
	Other assets	20,226			—			113,930			—			134,156
	Total assets	$	6,371,523		$	5,833,926		$	7,566,345		$	(12,242,030	)	$	7,529,764
	Liabilities, Noncontrolling Interests, and Equity
	Secured notes payable	$	—		$	—		$	708,831		$	—		$	708,831
	Unsecured senior notes payable	1,048,230			—			—			—			1,048,230
	Unsecured senior line of credit	204,000			—			—			—			204,000
	Unsecured senior bank term loans	1,100,000			—			—			—			1,100,000
	Accounts payable, accrued expenses, and tenant security deposits	48,373			—			386,969			—			435,342
	Dividends payable	54,131			—			289			—			54,420
	Total liabilities	2,454,734			—			1,096,089			—			3,550,823
	Redeemable noncontrolling interests	—			—			14,444			—			14,444
	Alexandria Real Estate Equities, Inc.’s stockholders’ equity	3,916,789			5,833,926			6,408,104			(12,242,030		)	3,916,789
Noncontrolling interests	—			—			47,708			—			47,708
Total equity	3,916,789			5,833,926			6,455,812			(12,242,030		)	3,964,497
Total liabilities, noncontrolling interests, and equity	$	6,371,523		$	5,833,926		$	7,566,345		$	(12,242,030	)	$	7,529,764
Condensed consolidating statements of income	'
	Condensed Consolidating Statement of Income
	for the Three Months Ended September 30, 2014
	(In thousands)
	(Unaudited)
		Alexandria			Alexandria			Combined			Eliminations			Consolidated
		Real Estate			Real Estate			Non-
		Equities, Inc.			Equities, L.P.			Guarantor
		(Issuer)			(Guarantor			Subsidiaries
					Subsidiary)
	Revenues:
	Rental	$	—		$	—		$	137,718		$	—		$	137,718
	Tenant recoveries	—			—			45,572			—			45,572
	Other income	2,797			(1,264		)	4,369			(3,577		)	2,325
	Total revenues	2,797			(1,264		)	187,659			(3,577		)	185,615
	Expenses:
	Rental operations	—			—			57,423			—			57,423
	General and administrative	11,369			—			4,817			(3,577		)	12,609
	Interest	15,307			—			5,248			—			20,555
	Depreciation and amortization	1,408			—			56,980			—			58,388
	Loss on early extinguishment of debt	525			—			—			—			525
	Total expenses	28,609			—			124,468			(3,577		)	149,500
	(Loss) income from continuing operations before equity in earnings of affiliates	(25,812		)	(1,264		)	63,191			—			36,115
	Equity in earnings of affiliates	60,415			58,381			1,127			(119,923		)	—
	Income from continuing operations	34,603			57,117			64,318			(119,923		)	36,115
	Loss from discontinued operations	—			—			(180		)	—			(180		)
	Gain on sales of land parcels	—			—			8			—			8
	Net income	34,603			57,117			64,146			(119,923		)	35,943
	Dividends on preferred stock	(6,471		)	—			—			—			(6,471		)
	Net income attributable to noncontrolling interests	—			—			(1,340		)	—			(1,340		)
	Net income attributable to unvested restricted stock awards	(506		)	—			—			—			(506		)
	Net income attributable to Alexandria Real Estate Equities, Inc.’s common stockholders	$	27,626		$	57,117		$	62,806		$	(119,923	)	$	27,626
	Condensed Consolidating Statement of Income
	for the Three Months Ended September 30, 2013
	(In thousands)
	(Unaudited)
		Alexandria			Alexandria			Combined			Eliminations			Consolidated
		Real Estate			Real Estate			Non-
		Equities, Inc.			Equities, L.P.			Guarantor
		(Issuer)			(Guarantor			Subsidiaries
					Subsidiary)
	Revenues:
	Rental	$	—		$	—		$	116,052		$	—		$	116,052
	Tenant recoveries	—			—			38,691			—			38,691
	Other income	2,802			(1		)	3,966			(3,195		)	3,572
	Total revenues	2,802			(1		)	158,709			(3,195		)	158,315
	Expenses:
	Rental operations	—			—			47,684			—			47,684
	General and administrative	10,140			—			4,721			(3,195		)	11,666
	Interest	10,238			—			5,933			—			16,171
	Depreciation and amortization	1,473			—			47,393			—			48,866
	Loss on early extinguishment of debt	1,432			—			—			—			1,432
	Total expenses	23,283			—			105,731			(3,195		)	125,819
	(Loss) income from continuing operations before equity in earnings of affiliates	(20,481		)	(1		)	52,978			—			32,496
	Equity in earnings of affiliates	51,975			48,477			959			(101,411		)	—
	Income from continuing operations	31,494			48,476			53,937			(101,411		)	32,496
	Loss from discontinued operations	(1		)	—			(42		)	—			(43		)
	Net income	31,493			48,476			53,895			(101,411		)	32,453
	Dividends on preferred stock	(6,472		)	—			—			—			(6,472		)
	Net income attributable to noncontrolling interests	—			—			(960		)	—			(960		)
	Net income attributable to unvested restricted stock awards	(442		)	—			—			—			(442		)
	Net income attributable to Alexandria Real Estate Equities, Inc.’s common stockholders	$	24,579		$	48,476		$	52,935		$	(101,411	)	$	24,579
	Condensed Consolidating Statement of Income
	for the Nine Months Ended September 30, 2014
(In thousands)
(Unaudited)
	Alexandria			Alexandria			Combined			Eliminations			Consolidated
	Real Estate			Real Estate			Non-
	Equities, Inc.			Equities, L.P.			Guarantor
	(Issuer)			(Guarantor			Subsidiaries
				Subsidiary)
Revenues:
Rental	$	—		$	—		$	403,280		$	—		$	403,280
Tenant recoveries	—			—			128,198			—			128,198
Other income	8,632			(2,799		)	11,534			(10,642		)	6,725
Total revenues	8,632			(2,799		)	543,012			(10,642		)	538,203
Expenses:
Rental operations	—			—			162,283			—			162,283
General and administrative	33,735			—			16,576			(10,642		)	39,669
Interest	41,339			—			15,772			—			57,111
Depreciation and amortization	4,335			—			161,788			—			166,123
Loss on early extinguishment of debt	525			—			—			—			525
Total expenses	79,934			—			356,419			(10,642		)	425,711
(Loss) income from continuing operations before equity in earnings of affiliates	(71,302		)	(2,799		)	186,593			—			112,492
Equity in earnings of affiliates	180,275			172,989			3,356			(356,620		)	—
Income from continuing operations	108,973			170,190			189,949			(356,620		)	112,492
Loss from discontinued operations	(7		)	—			(482		)	—			(489		)
Gain on sales of land parcels	—			—			805			—			805
Net income	108,966			170,190			190,272			(356,620		)	112,808
Dividends on preferred stock	(19,414		)	—			—			—			(19,414		)
Net income attributable to noncontrolling interests	—			—			(3,842		)	—			(3,842		)
Net income attributable to unvested restricted stock awards	(1,285		)	—			—			—			(1,285		)
Net income attributable to Alexandria Real Estate Equities, Inc.’s common stockholders	$	88,267		$	170,190		$	186,430		$	(356,620	)	$	88,267
Condensed Consolidating Statement of Income
for the Nine Months Ended September 30, 2013
(In thousands)
(Unaudited)
	Alexandria			Alexandria			Combined			Eliminations			Consolidated
	Real Estate			Real Estate			Non-
	Equities, Inc.			Equities, L.P.			Guarantor
	(Issuer)			(Guarantor			Subsidiaries
				Subsidiary)
Revenues:
Rental	$	—		$	—		$	342,071		$	—		$	342,071
Tenant recoveries	—			—			110,125			—			110,125
Other income	8,071			(142		)	11,635			(9,432		)	10,132
Total revenues	8,071			(142		)	463,831			(9,432		)	462,328
Expenses:
Rental operations	—			—			139,147			—			139,147
General and administrative	32,573			—			12,628			(9,432		)	35,769
Interest	32,048			—			18,121			—			50,169
Depreciation and amortization	4,394			—			136,645			—			141,039
Loss on early extinguishment of debt	1,992			—			—			—			1,992
Total expenses	71,007			—			306,541			(9,432		)	368,116
(Loss) income from continuing operations before equity in earnings of affiliates	(62,936		)	(142		)	157,290			—			94,212
Equity in earnings of affiliates	155,694			144,660			2,858			(303,212		)	—
Income from continuing operations	92,758			144,518			160,148			(303,212		)	94,212
Income from discontinued operations	347			—			696			—			1,043
Gain on sales of land parcels	—			—			772			—			772
Net income	93,105			144,518			161,616			(303,212		)	96,027
Dividends on preferred stock	(19,414		)	—			—			—			(19,414		)
Net income attributable to noncontrolling interests	—			—			(2,922		)	—			(2,922		)
Net income attributable to unvested restricted stock awards	(1,187		)	—			—			—			(1,187		)
Net income attributable to Alexandria Real Estate Equities, Inc.’s common stockholders	$	72,504		$	144,518		$	158,694		$	(303,212	)	$	72,504
Condensed consolidating statement comprehensive income	'
	Condensed Consolidating Statement of Comprehensive Income
	for the Three Months Ended September 30, 2014
	(In thousands)
	(Unaudited)
		Alexandria			Alexandria			Combined			Eliminations			Consolidated
		Real Estate			Real Estate			Non-
		Equities, Inc.			Equities, L.P.			Guarantor
		(Issuer)			(Guarantor			Subsidiaries
					Subsidiary)
	Net income	$	34,603		$	57,117		$	64,146		$	(119,923	)	$	35,943
	Other comprehensive income (loss):
	Unrealized losses on marketable securities:
	Unrealized holding losses arising during the period	—			(310		)	(2,144		)	—			(2,454		)
	Reclassification adjustment for losses included in net income	—			—			111			—			111
	Unrealized losses on marketable securities, net	—			(310		)	(2,033		)	—			(2,343		)
	Unrealized gains on interest rate swap agreements:
	Unrealized interest rate swap gains arising during the period	1,206			—			—			—			1,206
	Reclassification adjustment for amortization of interest expense included in net income	1,129			—			—			—			1,129
	Unrealized gains on interest rate swap agreements, net	2,335			—			—			—			2,335
	Unrealized losses on foreign currency translation:
	Unrealized foreign currency translation losses during the period	—			—			(12,259		)	—			(12,259		)
	Reclassification adjustment for gains included in net income	—			—			(199		)	—			(199		)
	Unrealized losses on foreign currency translation, net	—			—			(12,458		)	—			(12,458		)
	Total other comprehensive income (loss)	2,335			(310		)	(14,491		)	—			(12,466		)
	Comprehensive income	36,938			56,807			49,655			(119,923		)	23,477
	Less: comprehensive income attributable to noncontrolling interests	—			—			(1,340		)	—			(1,340		)
	Comprehensive income attributable to Alexandria’s common stockholders	$	36,938		$	56,807		$	48,315		$	(119,923	)	$	22,137
	Condensed Consolidating Statement of Comprehensive Income
	for the Three Months Ended September 30, 2013
	(In thousands)
	(Unaudited)
		Alexandria			Alexandria			Combined			Eliminations			Consolidated
		Real Estate			Real Estate			Non-
		Equities, Inc.			Equities, L.P.			Guarantor
		(Issuer)			(Guarantor			Subsidiaries
					Subsidiary)
	Net income	$	31,493		$	48,476		$	53,895		$	(101,411	)	$	32,453
	Other comprehensive income (loss):
	Unrealized losses on marketable securities:
	Unrealized holding (losses) gains arising during the period	—			(796		)	759			—			(37		)
	Reclassification adjustment for losses (gains) included in net income	—			519			(769		)	—			(250		)
	Unrealized losses on marketable securities, net	—			(277		)	(10		)	—			(287		)
	Unrealized gains on interest rate swap agreements:
	Unrealized interest rate swap losses arising during the period	(676		)	—			—			—			(676		)
	Reclassification adjustment for amortization of interest expense included in net income	3,904			—			—			—			3,904
	Unrealized gains on interest rate swap agreements, net	3,228			—			—			—			3,228
	Foreign currency translation losses	—			—			(3,404		)	—			(3,404		)
	Total other comprehensive income (loss)	3,228			(277		)	(3,414		)	—			(463		)
	Comprehensive income	34,721			48,199			50,481			(101,411		)	31,990
	Less: comprehensive income attributable to noncontrolling interests	—			—			(933		)	—			(933		)
	Comprehensive income attributable to Alexandria’s common stockholders	$	34,721		$	48,199		$	49,548		$	(101,411	)	$	31,057
	Condensed Consolidating Statement of Comprehensive Income
	for the Nine Months Ended September 30, 2014
	(In thousands)
	(Unaudited)
		Alexandria			Alexandria			Combined			Eliminations			Consolidated
		Real Estate			Real Estate			Non-
		Equities, Inc.			Equities, L.P.			Guarantor
		(Issuer)			(Guarantor			Subsidiaries
					Subsidiary)
	Net income	$	108,966		$	170,190		$	190,272		$	(356,620	)	$	112,808
	Other comprehensive income:
	Unrealized gains on marketable securities:
Unrealized holding gains arising during the period	—			—			13,591			—			13,591
Reclassification adjustment for losses included in net income	—			—			517			—			517
Unrealized gains on marketable securities, net	—			—			14,108			—			14,108
Unrealized gains on interest rate swap agreements:
Unrealized interest rate swap losses arising during the period	(2,708		)	—			—			—			(2,708		)
Reclassification adjustment for amortization of interest expense included in net income	5,742			—			—			—			5,742
Unrealized gains on interest rate swap agreements, net	3,034			—			—			—			3,034
Unrealized losses on foreign currency translation:
Unrealized foreign currency translation losses during the period	—			—			(9,450		)	—			(9,450		)
Reclassification adjustment for gains included in net income	—			—			(199		)	—			(199		)
Unrealized losses on foreign currency translation, net	—			—			(9,649		)	—			(9,649		)
Total other comprehensive income	3,034			—			4,459			—			7,493
Comprehensive income	112,000			170,190			194,731			(356,620		)	120,301
Less: comprehensive income attributable to noncontrolling interests	—			—			(3,842		)	—			(3,842		)
Comprehensive income attributable to Alexandria’s common stockholders	$	112,000		$	170,190		$	190,889		$	(356,620	)	$	116,459
Condensed Consolidating Statement of Comprehensive Income
for the Nine Months Ended September 30, 2013
(In thousands)
(Unaudited)
	Alexandria			Alexandria			Combined			Eliminations			Consolidated
	Real Estate			Real Estate			Non-
	Equities, Inc.			Equities, L.P.			Guarantor
	(Issuer)			(Guarantor			Subsidiaries
				Subsidiary)
Net income	$	93,105		$	144,518		$	161,616		$	(303,212	)	$	96,027
Other comprehensive income (loss):
Unrealized (losses) gains on marketable securities:
Unrealized holding (losses) gains arising during the period	—			(391		)	714			—			323
Reclassification adjustment for losses (gains) included in net income	—			144			(624		)	—			(480		)
Unrealized (losses) gains on marketable securities, net	—			(247		)	90			—			(157		)
Unrealized gains on interest rate swap agreements:
Unrealized interest rate swap losses arising during the period	(704		)	—			—			—			(704		)
Reclassification adjustment for amortization of interest expense included in net income	12,046			—			—			—			12,046
Unrealized gains on interest rate swap agreements, net	11,342			—			—			—			11,342
Foreign currency translation losses	—			—			(26,461		)	—			(26,461		)
Total other comprehensive income (loss)	11,342			(247		)	(26,371		)	—			(15,276		)
Comprehensive income	104,447			144,271			135,245			(303,212		)	80,751
Less: comprehensive income attributable to noncontrolling interests	—			—			(2,839		)	—			(2,839		)
Comprehensive income attributable to Alexandria’s common stockholders	$	104,447		$	144,271		$	132,406		$	(303,212	)	$	77,912
Condensed consolidating statement cash flows	'
	Condensed Consolidating Statement of Cash Flows
	for the Nine Months Ended September 30, 2014
	(In thousands)
	(Unaudited)
		Alexandria Real			Alexandria Real			Combined			Eliminations			Consolidated
		Estate Equities,			Estate Equities,			Non-Guarantor
		Inc. (Issuer)			L.P. (Guarantor			Subsidiaries
					Subsidiary)
	Operating Activities
	Net income	$	108,966		$	170,190		$	190,272		$	(356,620	)	$	112,808
	Adjustments to reconcile net income to net cash (used in) provided by operating activities:
	Depreciation and amortization	4,335			—			161,788			—			166,123
	Loss on early extinguishment of debt	525			—			—			—			525
	Gain on sale of land parcel	—			—			(805		)	—			(805		)
	Amortization of loan fees and costs	5,424			—			2,666			—			8,090
	Amortization of debt premiums/discounts	152			—			(52		)	—			100
	Amortization of acquired above and below market leases	—			—			(2,191		)	—			(2,191		)
	Deferred rent	—			—			(35,511		)	—			(35,511		)
	Stock compensation expense	9,372			—			—			—			9,372
	Equity in income related to subsidiaries	(180,275		)	(172,989		)	(3,356		)	356,620			—
	Investment gains	—			(3		)	(9,478		)	—			(9,481		)
	Investment losses	—			2,802			5,923			—			8,725
	Changes in operating assets and liabilities:
	Restricted cash	(15		)	—			15			—			—
	Tenant receivables	—			—			(939		)	—			(939		)
	Deferred leasing costs	(80		)	—			(25,830		)	—			(25,910		)
	Other assets	(5,263		)	—			(6,965		)	—			(12,228		)
	Accounts payable, accrued expenses, and tenant security deposits	50,210			—			(13,764		)	—			36,446
	Net cash (used in) provided by operating activities	(6,649		)	—			261,773			—			255,124
	Investing Activities
	Proceeds from sale of properties	—			—			28,378			—			28,378
	Additions to properties	—			—			(345,074		)	—			(345,074		)
	Purchase of properties	—			—			(97,785		)	—			(97,785		)
	Deposits for property acquisitions	—			—			(7,292		)	—			(7,292		)
	Change in restricted cash related to construction projects	—			—			6,694			—			6,694
	Investment in unconsolidated real estate entity	—			—			(67,525		)	—			(67,525		)
	Investments in subsidiaries	(322,228		)	(291,300		)	(12,150		)	625,678			—
	Additions to investments	—			—			(35,484		)	—			(35,484		)
	Proceeds from sales of investments	—			—			13,883			—			13,883
	Proceeds from repayment of notes receivable	—			—			29,866			—			29,866
	Net cash used in investing activities	$	(322,228	)	$	(291,300	)	$	(486,489	)	$	625,678		$	(474,339	)
	Condensed Consolidating Statement of Cash Flows (continued)
	for the Nine Months Ended September 30, 2014
	(In thousands)
	(Unaudited)
		Alexandria Real			Alexandria Real			Combined			Eliminations			Consolidated
		Estate Equities,			Estate Equities,			Non-Guarantor
		Inc. (Issuer)			L.P. (Guarantor			Subsidiaries
					Subsidiary)
	Financing Activities
	Borrowings from secured notes payable	$	—		$	—		$	108,626		$	—		$	108,626
	Repayments of borrowings from secured notes payable	—			—			(228,909		)	—			(228,909		)
	Proceeds from issuance of unsecured senior notes payable	698,908			—			—			—			698,908
	Principal borrowings from unsecured senior line of credit	890,000			—			—			—			890,000
	Repayments of borrowings from unsecured senior line of credit	(952,000		)	—			—			—			(952,000		)
	Repayment of unsecured senior bank term loan	(125,000		)	—			—			—			(125,000		)
	Transfer to/from parent company	103			291,300			334,275			(625,678		)	—
	Change in restricted cash related to financings	—			—			375			—			375
	Deferred financing costs paid	(6,515		)	—			(1,474		)	—			(7,989		)
	Dividends paid on common stock	(150,540		)	—			—			—			(150,540		)
	Dividends paid on preferred stock	(19,414		)	—			—			—			(19,414		)
	Contributions by noncontrolling interests	—			—			19,410			—			19,410
	Distributions to noncontrolling interests	—			—			(2,594		)	—			(2,594		)
Distributions to redeemable noncontrolling interests	—			—			(893		)	—			(893		)
Net cash provided by financing activities	335,542			291,300			228,816			(625,678		)	229,980
Effect of foreign exchange rate changes on cash and cash equivalents	—			—			(1,438		)	—			(1,438		)
Net increase in cash and cash equivalents	6,665			—			2,662			—			9,327
Cash and cash equivalents at beginning of period	14,790			—			42,906			—			57,696
Cash and cash equivalents at end of period	$	21,455		$	—		$	45,568		$	—		$	67,023
Supplemental Disclosure of Cash Flow Information
Cash paid during the period for interest, net of interest capitalized	$	20,089		$	—		$	13,694		$	—		$	33,783
Non-Cash Investing Activities
Assumption of secured notes payable in connection with purchase of properties	$	—		$	—		$	(48,329	)	$	—		$	(48,329	)
Condensed Consolidating Statement of Cash Flows
for the Nine Months Ended September 30, 2013
(In thousands)
(Unaudited)
	Alexandria Real			Alexandria Real			Combined			Eliminations			Consolidated
	Estate Equities,			Estate Equities,			Non-Guarantor
	Inc. (Issuer)			L.P. (Guarantor			Subsidiaries
				Subsidiary)
Operating Activities
Net income	$	93,105		$	144,518		$	161,616		$	(303,212	)	$	96,027
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Depreciation and amortization	4,393			—			138,284			—			142,677
Loss on early extinguishment of debt	1,992			—			—			—			1,992
Gain on sale of land parcel	—			—			(772		)	—			(772		)
Loss on sale of real estate	—			—			121			—			121
Amortization of loan fees and costs	5,148			—			2,152			—			7,300
Amortization of debt premiums/discounts	75			—			308			—			383
Amortization of acquired above and below market leases	—			—			(2,490		)	—			(2,490		)
Deferred rent	—			—			(20,007		)	—			(20,007		)
Stock compensation expense	11,541			—			—			—			11,541
Equity in income related to subsidiaries	(155,694		)	(144,660		)	(2,858		)	303,212			—
Investment gains	—			(152		)	(4,564		)	—			(4,716		)
Investment losses	—			298			231			—			529
Changes in operating assets and liabilities:
Restricted cash	(8		)	—			1,251			—			1,243
Tenant receivables	1			—			(272		)	—			(271		)
Deferred leasing costs	2,421			—			(39,611		)	—			(37,190		)
Other assets	(5,570		)	—			(5,858		)	—			(11,428		)
Intercompany receivables and payables	3,021			—			(3,021		)	—			—
Accounts payable, accrued expenses, and tenant security deposits	(9,599		)	—			61,036			—			51,437
Net cash (used in) provided by operating activities	(49,174		)	4			285,546			—			236,376
Investing Activities
Proceeds from sale of properties	10,796			—			91,019			—			101,815
Additions to properties	3,539			—			(453,679		)	—			(450,140		)
Purchase of properties	—			—			(24,537		)	—			(24,537		)
Change in restricted cash related to construction projects	—			—			5,711			—			5,711
Investment in unconsolidated real estate entity	—			—			(13,881		)	—			(13,881		)
Investments in subsidiaries	(126,967		)	(170,033		)	(3,045		)	300,045			—
Additions to investments	—			—			(22,835		)	—			(22,835		)
Proceeds from sales of investments	—			1,594			11,156			—			12,750
Net cash used in investing activities	$	(112,632	)	$	(168,439	)	$	(410,091	)	$	300,045		$	(391,117	)
Condensed Consolidating Statement of Cash Flows (continued)
for the Nine Months Ended September 30, 2013
(In thousands)
(Unaudited)
	Alexandria Real			Alexandria Real			Combined			Eliminations			Consolidated
	Estate Equities,			Estate Equities,			Non-Guarantor
	Inc. (Issuer)			L.P. (Guarantor			Subsidiaries
				Subsidiary)
Financing Activities
Borrowings from secured notes payable	$	—		$	—		$	26,319		$	—		$	26,319
Repayments of borrowings from secured notes payable	—			—			(34,120		)	—			(34,120		)
Proceeds from issuance of senior notes payable	498,561			—			—			—			498,561
Principal borrowings from unsecured senior line of credit	319,000			—			—			—			319,000
Repayments of borrowings from unsecured senior line of credit	(871,000		)	—			—			—			(871,000		)
Repayments of unsecured senior bank term loans	(250,000		)	—			—			—			(250,000		)
Repurchase of unsecured senior convertible notes	(384		)	—			—			—			(384		)
Transfer to/from parent company	—			166,522			133,523			(300,045		)	—
Change in restricted cash related to financings	(1		)	—			924			—			923
Deferred financing costs paid	(14,175		)	—			(2,072		)	—			(16,247		)
Proceeds from common stock offerings	535,686			—			—			—			535,686
Dividends paid on common stock	(120,367		)	—			—			—			(120,367		)
Dividends paid on preferred stock	(19,414		)	—			—			—			(19,414		)
Distributions to noncontrolling interests	—			—			(2,100		)	—			(2,100		)
Net cash provided by financing activities	77,906			166,522			122,474			(300,045		)	66,857
Effect of foreign exchange rate changes on cash and cash equivalents	—			—			752			—			752
Net decrease in cash and cash equivalents	(83,900		)	(1,913		)	(1,319		)	—			(87,132		)
Cash and cash equivalents at beginning of period	98,567			1,913			40,491			—			140,971
Cash and cash equivalents at end of period	$	14,667		$	—		$	39,172		$	—		$	53,839
Supplemental Disclosure of Cash Flow Information
Cash paid during the period for interest, net of interest capitalized	$	16,569		$	—		$	17,712		$	—		$	34,281
Non-Cash Investing Activities
Note receivable issued in connection with sale of real estate	$	29,820		$	—		$	9,000		$	—		$	38,820

Background_Details

Background (Details) (USD $)	9 Months Ended
In Billions, unless otherwise specified	Sep. 30, 2014
Nature of Business [Line Items]	'
Total Square Footage of Asset Base	31,617,818
Total Market Capitalization	9.1
Total Rentable Square Footage of Asset Base	31,617,818
Area of Real Estate Property	18,458,379
Square Footage of Real Estate Property, Future Development	13,100,000
Investment-grade client tenants as a percentage of total annualized base rent	53.00%
Percentage of leases containing effective annual rent escalations	95.00%
Percentage of leases which are triple net leases	95.00%
Percentage of leases providing for recapture of certain capital expenditures	93.00%
Minimum	'
Nature of Business [Line Items]	'
Effective annual rent escalations (as a percent)	3.00%
Maximum	'
Nature of Business [Line Items]	'
Effective annual rent escalations (as a percent)	3.50%

Background_Schedule_of_rentabl

Background Schedule of rentable square feet (Details)	Sep. 30, 2014
	sqft
Real Estate Properties [Line Items]	'
Area of Real Estate Property	18,458,379
Square Footage of Real Estate Property, Future Development	13,100,000
Total Rentable Square Footage of Asset Base	31,617,818
Operating properties [Member]	'
Real Estate Properties [Line Items]	'
Area of Real Estate Property	16,373,416
Development [Member]	'
Real Estate Properties [Line Items]	'
Area of Real Estate Property	1,941,186
Redevelopment [Member]	'
Real Estate Properties [Line Items]	'
Area of Real Estate Property	143,777
Near-term value-creation projects in North America (CIP)	'
Real Estate Properties [Line Items]	'
Square Footage of Real Estate Property, Future Development	1,926,331
Land held for future development in North America	'
Real Estate Properties [Line Items]	'
Square Footage of Real Estate Property, Future Development	10,983,108
Land subject to sale negotiations	'
Real Estate Properties [Line Items]	'
Square Footage of Real Estate Property, Future Development	250,000

Basis_of_presentation_Details

Basis of presentation (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Property, plant and equipment depreciated on a straight-line basis using an estimated life	'	'	'	'	'
Percent of Taxable Income, Generally Distributed as Dividend	'	'	100.00%	'	'
Maximum Expected Period for Collection of Receivables	'	'	'1 year	'	'
Basis of presentation	'	'	'	'	'
Maximum expected period of sale of property (in years)	'	'	'1 year	'	'
Cost method investment ownership percentage	10.00%	'	10.00%	'	10.00%
Minimum percentage of taxable income to be distributed	'	'	100.00%	'	'
Provision for federal income taxes	'	'	$0	'	'
Interest income included in other income	2,000,000	1,200,000	3,800,000	3,500,000	'
Allowance for Doubtful Accounts Receivable	$0	'	$0	'	$0
Maximum	'	'	'	'	'
Basis of presentation	'	'	'	'	'
Percentage of ownership interest criteria	100.00%	'	100.00%	'	'
Land improvements	'	'	'	'	'
Property, plant and equipment depreciated on a straight-line basis using an estimated life	'	'	'	'	'
Estimated useful life	'	'	'20 years	'	'
Buildings and building improvements | Maximum	'	'	'	'	'
Property, plant and equipment depreciated on a straight-line basis using an estimated life	'	'	'	'	'
Estimated useful life	'	'	'40 years	'	'

Investments_in_real_estate_net2

Investments in real estate, net Schedule of investment in real estates (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Real Estate Properties [Line Items]	'	'
Rental properties	$6,849,966	$6,442,208
Land/future value-added projects:	'	'
Land available for development	716,349	658,546
Real Estate Investment Property, at Cost	8,166,631	7,682,376
Less: accumulated depreciation	-1,083,169	-952,106
Equity Method Investments	114,168	46,644
Investments in real estate, net	7,197,630	6,776,914
Construction in progress ("CIP")/current value-added projects:	'	'
Construction in progress ("CIP")/current value-added projects:	'	'
Development in process	600,316	581,622
Active development in North America | North America [Member]	'	'
Construction in progress ("CIP")/current value-added projects:	'	'
Development in process	532,053	511,838
Active redevelopment in North America | North America [Member]	'	'
Construction in progress ("CIP")/current value-added projects:	'	'
Development in process	32,661	8,856
Active development and redevelopment in Asia | Asia [Member]	'	'
Construction in progress ("CIP")/current value-added projects:	'	'
Development in process	35,602	60,928
Land undergoing predevelopment activities (CIP) in North America (2)	'	'
Land/future value-added projects:	'	'
Land available for development	404,222	382,289
Land held for future development in North America	'	'
Land/future value-added projects:	'	'
Land available for development	299,891	253,314
Land held for future development in North America | North America [Member]	'	'
Land/future value-added projects:	'	'
Land available for development	221,572	176,063
Land held for future development in North America | Asia [Member]	'	'
Land/future value-added projects:	'	'
Land available for development	78,319	77,251
Land subject to sale negotiations	'	'
Land/future value-added projects:	'	'
Land available for development	12,236	22,943
50, 60, and 100 Binney Street Project [Member] | Land undergoing predevelopment activities (CIP) in North America (2) | North America [Member]	'	'
Land/future value-added projects:	'	'
Land available for development	313,379	284,672
Other Projects in North America [Member] | Land undergoing predevelopment activities (CIP) in North America (2) | North America [Member]	'	'
Land/future value-added projects:	'	'
Land available for development	$90,843	$97,617

Investments_in_real_estate_net3

Investments in real estate, net Acquisitions (Details) (USD $)	9 Months Ended		0 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Mar. 27, 2014	Jan. 30, 2014	Mar. 17, 2014	Apr. 18, 2014	Apr. 18, 2014	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2014
	sqft		Greater Boston, Massachusetts	San Diego, California	San Diego, California	San Francisco, California [Member]	San Francisco, California [Member]	Secured Debt Maturing on January 2023	Secured Debt Maturing On 15 April 2016	Secured Debt Maturing On 15 April 2016
			225 Second Avenue	3545 Cray Court	4025/4031/4045 Sorrento Valley Boulevard	510 Townsend Street [Member]	1455/1515 Third Street [Member]	San Diego, California		San Diego, California
			sqft	sqft	sqft	sqft		3545 Cray Court		4025/4031/4045 Sorrento Valley Boulevard
					property
Business Acquisition [Line Items]	'	'	'	'	'	'	'	'	'	'
Area of Real Estate Property	18,458,379	'	112,500	116,556	42,566	300,000	'	'	'	'
Payments to acquire real estate property	'	'	$16,300,000	$64,000,000	$12,400,000	$50,000,000	$125,000,000	'	'	'
Average percentage of occupied properties	'	'	'	100.00%	100.00%	'	'	'	'	'
Assumption of secured notes payable in connection with purchase of properties	($48,329,000)	$0	'	$40,700,000	$7,600,000	'	'	'	'	'
Number of real estate properties	'	'	'	'	3	'	'	'	'	'
Stated interest rate (as a percent)	'	'	'	'	'	'	'	4.66%	5.74%	5.74%

Investments_in_real_estate_net4

Investments in real estate, net Development and redevelopment projects (Details)	Sep. 30, 2014
	sqft
Real Estate Properties [Line Items]	'
Area of Real Estate Property	18,458,379
Development [Member]	'
Real Estate Properties [Line Items]	'
Number of real estate properties	7
Redevelopment [Member]	'
Real Estate Properties [Line Items]	'
Number of real estate properties	2
North America [Member] | Development [Member]	'
Real Estate Properties [Line Items]	'
Area of Real Estate Property	1,636,424
North America [Member] | Redevelopment [Member]	'
Real Estate Properties [Line Items]	'
Area of Real Estate Property	143,777

Investments_in_real_estate_net5

Investments in real estate, net Investment in unconsolidated entity (Details) (USD $)

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Apr. 18, 2014

Sep. 30, 2014

Sep. 30, 2014

sqft

Debt Instrument, Variable Rate Base [Domain]

Debt Instrument, Variable Rate Spread [Member]

Debt Instrument, Variable Rate Floor [Member]

Longwood [Member]

Longwood [Member]

Longwood [Member]

Longwood [Member]

Longwood [Member]

1455/1515 Third Street [Member]

1455/1515 Third Street [Member]

Alexandria [Member]

Uber Technologies, Inc. [Member]

Greater Boston market

Greater Boston market

Greater Boston market

Greater Boston market

Greater Boston market

Aggregate Commitments [Member]

Outstanding Balance [Member]

Remaining Commitments [Member]

San Franciso Bay Area [Member]

San Francisco, California [Member]

1455/1515 Third Street [Member]

1455/1515 Third Street [Member]

Equity Method Investee

Equity Method Investee

Equity Method Investee

sqft

Equity Method Investee

Greater Boston market

Greater Boston market

Greater Boston market

sqft

San Francisco, California [Member]

San Francisco, California [Member]

Schedule of Equity Method Investments [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Equity interest percentage (in percent)

'

'

'

'

'

'

27.50%

'

'

'

'

'

51.00%

49.00%

Area of Real Estate Property

18,458,379

'

'

'

'

413,536

'

'

'

'

422,980

'

'

'

Payments to acquire real estate property

'

'

'

'

'

'

'

'

'

'

'

$125,000,000

'

'

Expected Total Joint Venture Development Cost

'

'

'

'

'

350,000,000

'

'

'

'

'

'

'

'

Pre-leased RSF as a Percentage of Total RSF

'

'

'

'

'

37.00%

'

'

'

'

100.00%

'

'

'

Length of Lease

'

'

'

'

'

'

'

'

'

'

'15 years

'

'

'

Equity Method Investments

114,168,000

46,644,000

'

'

'

48,524,000

'

'

'

'

65,644,000

'

'

'

Long-term Construction Loan

'

'

'

'

'

'

'

$213,200,000

$143,500,000

$69,700,000

'

'

'

'

Base rate

'

'

'LIBOR

'

'

'

'

'

'

'

'

'

'

'

Applicable margin (as a percent)

'

'

'

3.75%

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Interest Rate Floor

'

'

'

'

5.25%

'

'

'

'

'

'

'

'

'

Investments_in_real_estate_net6

Investments in real estate, net Land undergoing predevelopment and future development (Details)	Sep. 30, 2014
	sqft
Real Estate Properties [Line Items]	'
Area of Real Estate Property	18,458,379
Near-term value-creation projects in North America (CIP) | North America [Member]	'
Real Estate Properties [Line Items]	'
Area of Real Estate Property	1,926,331
Near-term value-creation projects in North America (CIP) | Alexandria Centerâ„¢ at Kendall Square	'
Real Estate Properties [Line Items]	'
Area of Real Estate Property	1,062,180
Land held for future development in North America | North America [Member]	'
Real Estate Properties [Line Items]	'
Area of Real Estate Property	3,400,000

Investments_in_real_estate_net7

Investments in real estate, net Dispositions (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
			property
Dispositions [Line Items]	'	'	'	'
Gain (Loss) on Sale of Properties, Net of Applicable Income Taxes	$8,000	$0	$805,000	$772,000
Number of Land Parcels Sold	'	'	4	'
Proceeds from Sale of Real Estate	'	'	29,400,000	'
Non-Cluster market [Member]	'	'	'	'
Dispositions [Line Items]	'	'	'	'
Gain (Loss) on Sale of Properties, Net of Applicable Income Taxes	'	'	0	'
Number of Land Parcels Sold	'	'	3	'
Seattle Market [Member]	'	'	'	'
Dispositions [Line Items]	'	'	'	'
Gain (Loss) on Sale of Properties, Net of Applicable Income Taxes	'	'	$800,000	'
Number of Land Parcels Sold	'	'	1	'

Investments_Summary_of_Investm

Investments Summary of Investments (Details) (USD $)	3 Months Ended			9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013	Sep. 30, 2014		Sep. 30, 2013	Dec. 31, 2013
Investments [Abstract]	'		'	'		'	'
“Available-for-sale” marketable equity securities, cost basis	$15,119,000		'	$15,119,000		'	$2,879,000
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	17,150,000	[1]	'	17,150,000	[1]	'	2,177,000
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax	-1,452,000		'	-1,452,000		'	-587,000
“Available-for-sale” marketable equity securities, at fair value	30,817,000		'	30,817,000		'	4,469,000
Investments accounted for under cost method	146,760,000		'	146,760,000		'	135,819,000
Marketable Securities	177,577,000		'	177,577,000		'	140,288,000
Unrealized holding (losses) gains arising during the period	-2,454,000		-37,000	13,591,000		323,000	'
Unrealized Loss in Investment in Privately Held Entities	$0		'	$0		'	$0
[1]	The increase in our investments during the nine months ended September 30, 2014, includes an increase in unrealized gains of approximately $13.6 million related to our investments in publicly traded life science companies. These unrealized gains are a component of our comprehensive income, within our stockholders’ equity, and have not been recognized in the accompanying consolidated statement of income for the nine months ended September 30, 2014.

Investments_Investment_Income_

Investments Investment Income (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Investments [Abstract]	'	'	'	'
Gain on Sale of Investments	$3,256	$2,050	$9,481	$4,716
Investment losses	-3,485	0	-8,725	-529
Investment (loss) income	($229)	$2,050	$756	$4,187

Secured_and_unsecured_senior_d2

Secured and unsecured senior debt Narratives (Details) (USD $)	0 Months Ended
In Thousands, unless otherwise specified	Jan. 31, 2014	Sep. 30, 2014
	Alexandria Technology Square [Member]	Construction Loans
	Secured Debt from Insurance Company Maturing on 1 April 2014 [Member]
Debt Instrument [Line Items]	'	'
Outstanding Balance	$208,700	$154,640
Proceeds from Contributions from Affiliates	$20,900	'

Secured_and_unsecured_senior_d3

Secured and unsecured senior debt Summary of secured and unsecured debt (Details) (USD $)	3 Months Ended			9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013	Sep. 30, 2014		Sep. 30, 2013
Debt Instrument [Line Items]	'		'	'		'
Repayments of Unsecured Debt	'		'	$125,000,000		$250,000,000
Fixed Rate/Hedged Variable Rate	3,103,415,000		'	3,103,415,000		'
Unhedged Variable rate	397,700,000		'	397,700,000		'
Total Consolidated	3,501,115,000		'	3,501,115,000		'
Percentage of Total	100.00%		'	100.00%		'
Total consolidated debt, Effective Interest	3.39%	[1]	'	3.39%	[1]	'
Weighted Average Remaining Terms (in years)	'		'	'5 years 11 months		'
Percentage of fixed rate/hedged total debt	89.00%		'	89.00%		'
Percentage of unhedged floating rate total debt	11.00%		'	11.00%		'
Gains (Losses) on Extinguishment of Debt	-525,000		-1,432,000	-525,000		-1,992,000
Secured notes payable	'		'	'		'
Debt Instrument [Line Items]	'		'	'		'
Fixed Rate/Hedged Variable Rate	406,125,000		'	406,125,000		'
Unhedged Variable rate	230,700,000		'	230,700,000		'
Total Consolidated	636,825,000		'	636,825,000		'
Percentage of Total	18.20%		'	18.20%		'
Weighted Average Interest Rate at End of Period	4.67%	[1]	'	4.67%	[1]	'
Weighted Average Remaining Terms (in years)	'		'	'2 years 11 months		'
Stated interest rate (as a percent)	4.71%		'	4.71%		'
Senior Notes [Member]	'		'	'		'
Debt Instrument [Line Items]	'		'	'		'
Debt Instrument, Face Amount	700,000,000		'	700,000,000		'
Fixed Rate/Hedged Variable Rate	1,747,290,000		'	1,747,290,000		'
Unhedged Variable rate	0		'	0		'
Total Consolidated	1,747,290,000		'	1,747,290,000		'
Percentage of Total	49.90%		'	49.90%		'
Weighted Average Interest Rate at End of Period	3.98%		'	3.98%		'
Weighted Average Remaining Terms (in years)	'		'	'8 years 7 months		'
Stated interest rate (as a percent)	3.50%		'	3.50%		'
Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions	'		'	100.00%		'
$1.5 billion unsecured senior line of credit	'		'	'		'
Debt Instrument [Line Items]	'		'	'		'
Outstanding Balance	142,000,000		'	142,000,000		'
Fixed Rate/Hedged Variable Rate	0		'	0		'
Unhedged Variable rate	142,000,000		'	142,000,000		'
Total Consolidated	142,000,000		'	142,000,000		'
Percentage of Total	4.10%		'	4.10%		'
Weighted Average Interest Rate at End of Period	1.25%	[1]	'	1.25%	[1]	'
Weighted Average Remaining Terms (in years)	'		'	'4 years 3 months		'
2016 Unsecured Senior Bank Term Loan	'		'	'		'
Debt Instrument [Line Items]	'		'	'		'
Outstanding Balance	375,000,000		'	375,000,000		'
Fixed Rate/Hedged Variable Rate	350,000,000		'	350,000,000		'
Unhedged Variable rate	25,000,000		'	25,000,000		'
Total Consolidated	375,000,000		'	375,000,000		'
Percentage of Total	10.70%		'	10.70%		'
Weighted Average Interest Rate at End of Period	1.42%	[1]	'	1.42%	[1]	'
Weighted Average Remaining Terms (in years)	'		'	'1 year 9 months		'
2019 Unsecured Senior Bank Term Loan	'		'	'		'
Debt Instrument [Line Items]	'		'	'		'
Outstanding Balance	600,000,000		'	600,000,000		'
Fixed Rate/Hedged Variable Rate	600,000,000		'	600,000,000		'
Unhedged Variable rate	0		'	0		'
Total Consolidated	$600,000,000		'	$600,000,000		'
Percentage of Total	17.10%		'	17.10%		'
Weighted Average Interest Rate at End of Period	2.05%	[1]	'	2.05%	[1]	'
Weighted Average Remaining Terms (in years)	'		'	'4 years 3 months		'
[1]	Represents the weighted average interest rate as of the end of the period plus the impact of debt premiums/discounts and our interest rate swap agreements. The weighted average interest rate excludes bank fees and amortization of loan fees.

Secured_and_unsecured_senior_d4

Secured and unsecured senior debt Detail of secured and unsecured debt (Details) (USD $)	9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013
Summary of fixed rate/hedged and floating rate debt	'		'
Fixed Rate/Hedged Variable Rate	$3,103,415,000		'
Unhedged Variable rate	397,700,000		'
Principal amount	3,501,115,000		'
Total consolidated debt, Effective Interest	3.39%	[1]	'
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid	3,470,517,000		'
Debt Instrument, Annual Principal Payment	30,598,000		'
Future principal payments due on secured and unsecured debt	'		'
Repayments of Unsecured Debt	125,000,000		250,000,000
2014	'		'
Summary of fixed rate/hedged and floating rate debt	'		'
Fixed Rate/Hedged Variable Rate	2,055,000		'
Unhedged Variable rate	60,000		'
Principal amount	2,115,000		'
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid	0		'
Debt Instrument, Annual Principal Payment	2,115,000		'
2015	'		'
Summary of fixed rate/hedged and floating rate debt	'		'
Fixed Rate/Hedged Variable Rate	14,290,000		'
Unhedged Variable rate	46,596,000		'
Principal amount	60,886,000		'
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid	52,336,000		'
Debt Instrument, Annual Principal Payment	8,550,000		'
2016	'		'
Summary of fixed rate/hedged and floating rate debt	'		'
Fixed Rate/Hedged Variable Rate	591,423,000		'
Unhedged Variable rate	42,952,000		'
Principal amount	634,375,000		'
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid	629,851,000		'
Debt Instrument, Annual Principal Payment	4,524,000		'
2017	'		'
Summary of fixed rate/hedged and floating rate debt	'		'
Fixed Rate/Hedged Variable Rate	3,042,000		'
Unhedged Variable rate	166,092,000		'
Principal amount	169,134,000		'
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid	166,092,000		'
Debt Instrument, Annual Principal Payment	3,042,000		'
2018	'		'
Summary of fixed rate/hedged and floating rate debt	'		'
Fixed Rate/Hedged Variable Rate	3,253,000		'
Unhedged Variable rate	0		'
Principal amount	3,253,000		'
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid	0		'
Debt Instrument, Annual Principal Payment	3,253,000		'
Thereafter	'		'
Summary of fixed rate/hedged and floating rate debt	'		'
Fixed Rate/Hedged Variable Rate	2,489,352,000		'
Unhedged Variable rate	142,000,000		'
Principal amount	2,631,352,000		'
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid	2,622,238,000		'
Debt Instrument, Annual Principal Payment	9,114,000		'
Secured notes payable	'		'
Summary of fixed rate/hedged and floating rate debt	'		'
Fixed Rate/Hedged Variable Rate	406,125,000		'
Unhedged Variable rate	230,700,000		'
Principal amount	636,825,000		'
Stated interest rate (as a percent)	4.71%		'
Effective rate (as a percent)	4.67%	[1]	'
Future principal payments due on secured and unsecured debt	'		'
2014	2,194,000		'
2015	61,212,000		'
2016	259,712,000		'
2017	169,484,000		'
2018	3,615,000		'
Thereafter	140,608,000		'
Other secured notes payable maturing on 11/18/14	'		'
Summary of fixed rate/hedged and floating rate debt	'		'
Stated interest rate (as a percent)	6.00%		'
Effective rate (as a percent)	6.00%	[1]	'
Maturity Date	18-Nov-14	[2]	'
Future principal payments due on secured and unsecured debt	'		'
2014	60,000		'
2015	0		'
2016	0		'
2017	0		'
2018	0		'
Thereafter	0		'
Outstanding Balance	60,000		'
Secured notes payable from bank maturing on 6/1/15	'		'
Summary of fixed rate/hedged and floating rate debt	'		'
Stated interest rate (as a percent)	5.64%		'
Effective rate (as a percent)	4.50%	[1]	'
Maturity Date	1-Jun-15	[2]	'
Future principal payments due on secured and unsecured debt	'		'
2014	34,000		'
2015	5,777,000		'
2016	0		'
2017	0		'
2018	0		'
Thereafter	0		'
Outstanding Balance	5,811,000		'
Secured notes payable maturing on 7/1/15	'		'
Summary of fixed rate/hedged and floating rate debt	'		'
Effective rate (as a percent)	1.66%	[1]	'
Maturity Date	1-Jul-15	[2]	'
Number of extensions available under line of credit	2		'
Future principal payments due on secured and unsecured debt	'		'
2014	0		'
2015	46,596,000		'
2016	0		'
2017	0		'
2018	0		'
Thereafter	0		'
Outstanding Balance	46,596,000		'
CMBS maturing on 1/1/16	'		'
Summary of fixed rate/hedged and floating rate debt	'		'
Stated interest rate (as a percent)	5.73%		'
Effective rate (as a percent)	5.73%	[1]	'
Maturity Date	1-Jan-16	[2]	'
Future principal payments due on secured and unsecured debt	'		'
2014	440,000		'
2015	1,816,000		'
2016	75,501,000		'
2017	0		'
2018	0		'
Thereafter	0		'
Outstanding Balance	77,757,000		'
CMBS maturing on 4/1/16	'		'
Summary of fixed rate/hedged and floating rate debt	'		'
Stated interest rate (as a percent)	5.82%		'
Effective rate (as a percent)	5.82%	[1]	'
Maturity Date	1-Apr-16	[2]	'
Future principal payments due on secured and unsecured debt	'		'
2014	234,000		'
2015	988,000		'
2016	29,389,000		'
2017	0		'
2018	0		'
Thereafter	0		'
Outstanding Balance	30,611,000		'
Secured Debt Maturing On 15 April 2016	'		'
Summary of fixed rate/hedged and floating rate debt	'		'
Stated interest rate (as a percent)	5.74%		'
Effective rate (as a percent)	3.00%	[1]	'
Maturity Date	15-Apr-16	[2]	'
Future principal payments due on secured and unsecured debt	'		'
2014	42,000		'
2015	175,000		'
2016	6,916,000		'
2017	0		'
2018	0		'
Thereafter	0		'
Outstanding Balance	7,133,000		'
Secured notes payable maturing on 06/1/16	'		'
Summary of fixed rate/hedged and floating rate debt	'		'
Effective rate (as a percent)	1.56%	[1]	'
Maturity Date	1-Jun-16	[2]	'
Number of extensions available under line of credit	2		'
Future principal payments due on secured and unsecured debt	'		'
2014	0		'
2015	0		'
2016	17,952,000		'
2017	0		'
2018	0		'
Thereafter	0		'
Outstanding Balance	17,952,000		'
CMBS maturing on 8/1/16	'		'
Summary of fixed rate/hedged and floating rate debt	'		'
Stated interest rate (as a percent)	6.35%		'
Effective rate (as a percent)	6.35%	[1]	'
Maturity Date	1-Aug-16	[2]	'
Future principal payments due on secured and unsecured debt	'		'
2014	619,000		'
2015	2,652,000		'
2016	126,715,000		'
2017	0		'
2018	0		'
Thereafter	0		'
Outstanding Balance	129,986,000		'
Secured Debt from Bank Maturing on 20 January 2017	'		'
Summary of fixed rate/hedged and floating rate debt	'		'
Stated interest rate (as a percent)	2.14%		'
Effective rate (as a percent)	2.14%	[1]	'
Maturity Date	20-Jan-17	[2]	'
Future principal payments due on secured and unsecured debt	'		'
2014	0		'
2015	0		'
2016	0		'
2017	76,000,000		'
2018	0		'
Thereafter	0		'
Outstanding Balance	76,000,000		'
Secured notes payable maturing on 8/23/17	'		'
Summary of fixed rate/hedged and floating rate debt	'		'
Effective rate (as a percent)	1.50%	[1]	'
Maturity Date	23-Aug-17	[2]	'
Future principal payments due on secured and unsecured debt	'		'
2014	0		'
2015	0		'
2016	0		'
2017	90,092,000		'
2018	0		'
Thereafter	0		'
Outstanding Balance	90,092,000		'
Secured Debt Other Maturing 1 April 2020	'		'
Summary of fixed rate/hedged and floating rate debt	'		'
Stated interest rate (as a percent)	7.75%		'
Effective rate (as a percent)	7.75%	[1]	'
Maturity Date	1-Apr-20	[2]	'
Future principal payments due on secured and unsecured debt	'		'
2014	374,000		'
2015	1,570,000		'
2016	1,696,000		'
2017	1,832,000		'
2018	1,979,000		'
Thereafter	106,490,000		'
Outstanding Balance	113,941,000		'
Secured Debt Maturing on January 2023	'		'
Summary of fixed rate/hedged and floating rate debt	'		'
Stated interest rate (as a percent)	4.66%		'
Effective rate (as a percent)	4.66%	[1]	'
Maturity Date	1-Jan-23	[2]	'
Future principal payments due on secured and unsecured debt	'		'
2014	337,000		'
2015	1,402,000		'
2016	1,464,000		'
2017	1,540,000		'
2018	1,614,000		'
Thereafter	33,367,000		'
Outstanding Balance	39,724,000		'
Secured notes payable from bank maturing on 6/1/37	'		'
Summary of fixed rate/hedged and floating rate debt	'		'
Stated interest rate (as a percent)	6.50%		'
Effective rate (as a percent)	6.50%	[1]	'
Maturity Date	1-Jun-37	[2]	'
Future principal payments due on secured and unsecured debt	'		'
2014	0		'
2015	18,000		'
2016	19,000		'
2017	20,000		'
2018	22,000		'
Thereafter	751,000		'
Outstanding Balance	830,000		'
Unamortized Premiums	'		'
Future principal payments due on secured and unsecured debt	'		'
Unamortized premium	332,000		'
Unamortized Premiums | 2014	'		'
Future principal payments due on secured and unsecured debt	'		'
Unamortized premium	54,000		'
Unamortized Premiums | 2015	'		'
Future principal payments due on secured and unsecured debt	'		'
Unamortized premium	218,000		'
Unamortized Premiums | 2016	'		'
Future principal payments due on secured and unsecured debt	'		'
Unamortized premium	60,000		'
Unamortized Premiums | 2017	'		'
Future principal payments due on secured and unsecured debt	'		'
Unamortized premium	0		'
Unamortized Premiums | 2018	'		'
Future principal payments due on secured and unsecured debt	'		'
Unamortized premium	0		'
Unamortized Premiums | Thereafter	'		'
Future principal payments due on secured and unsecured debt	'		'
Unamortized premium	0		'
Unsecured Debt	'		'
Summary of fixed rate/hedged and floating rate debt	'		'
Principal amount	2,864,290,000		'
Effective rate (as a percent)	3.11%	[1]	'
Unsecured Debt | 2014	'		'
Future principal payments due on secured and unsecured debt	'		'
2014	-79,000		'
Unsecured Debt | 2015	'		'
Future principal payments due on secured and unsecured debt	'		'
2015	-326,000		'
Unsecured Debt | 2016	'		'
Future principal payments due on secured and unsecured debt	'		'
2016	374,663,000		'
Unsecured Debt | 2017	'		'
Future principal payments due on secured and unsecured debt	'		'
2017	-350,000		'
Unsecured Debt | 2018	'		'
Future principal payments due on secured and unsecured debt	'		'
2018	-362,000		'
Unsecured Debt | Thereafter	'		'
Future principal payments due on secured and unsecured debt	'		'
Thereafter	2,490,744,000		'
2016 Unsecured Senior Bank Term Loan	'		'
Summary of fixed rate/hedged and floating rate debt	'		'
Fixed Rate/Hedged Variable Rate	350,000,000		'
Unhedged Variable rate	25,000,000		'
Principal amount	375,000,000		'
Effective rate (as a percent)	1.42%	[1]	'
Maturity Date	31-Jul-16	[2]	'
Future principal payments due on secured and unsecured debt	'		'
2014	0		'
2015	0		'
2016	375,000,000		'
2017	0		'
2018	0		'
Thereafter	0		'
Outstanding Balance	375,000,000		'
2019 Unsecured Senior Bank Term Loan	'		'
Summary of fixed rate/hedged and floating rate debt	'		'
Fixed Rate/Hedged Variable Rate	600,000,000		'
Unhedged Variable rate	0		'
Principal amount	600,000,000		'
Effective rate (as a percent)	2.05%	[1]	'
Maturity Date	3-Jan-19	[2]	'
Future principal payments due on secured and unsecured debt	'		'
2014	0		'
2015	0		'
2016	0		'
2017	0		'
2018	0		'
Thereafter	600,000,000		'
Outstanding Balance	600,000,000		'
$1.5 billion unsecured senior line of credit	'		'
Summary of fixed rate/hedged and floating rate debt	'		'
Fixed Rate/Hedged Variable Rate	0		'
Unhedged Variable rate	142,000,000		'
Principal amount	142,000,000		'
Effective rate (as a percent)	1.25%	[1]	'
Maturity Date	3-Jan-19	[2]	'
Annual facility fee (as a percent)	0.20%		'
Future principal payments due on secured and unsecured debt	'		'
2014	0		'
2015	0		'
2016	0		'
2017	0		'
2018	0		'
Thereafter	142,000,000		'
Outstanding Balance	142,000,000		'
Unsecured Senior Notes Due in January 2020 [Member]	'		'
Summary of fixed rate/hedged and floating rate debt	'		'
Stated interest rate (as a percent)	2.75%		'
Effective rate (as a percent)	2.79%	[1]	'
Maturity Date	15-Jan-20	[2]	'
Future principal payments due on secured and unsecured debt	'		'
2014	0		'
2015	0		'
2016	0		'
2017	0		'
2018	0		'
Thereafter	400,000,000		'
Outstanding Balance	400,000,000		'
4.60% unsecured senior notes payable	'		'
Summary of fixed rate/hedged and floating rate debt	'		'
Stated interest rate (as a percent)	4.60%		'
Effective rate (as a percent)	4.61%	[1]	'
Maturity Date	1-Apr-22	[2]	'
Future principal payments due on secured and unsecured debt	'		'
2014	0		'
2015	0		'
2016	0		'
2017	0		'
2018	0		'
Thereafter	550,000,000		'
Outstanding Balance	550,000,000		'
3.90% unsecured senior notes payable	'		'
Summary of fixed rate/hedged and floating rate debt	'		'
Stated interest rate (as a percent)	3.90%		'
Effective rate (as a percent)	3.94%	[1]	'
Maturity Date	15-Jun-23	[2]	'
Future principal payments due on secured and unsecured debt	'		'
2014	0		'
2015	0		'
2016	0		'
2017	0		'
2018	0		'
Thereafter	500,000,000		'
Outstanding Balance	500,000,000		'
Unsecured Senior Notes Due in July 2029 [Member]	'		'
Summary of fixed rate/hedged and floating rate debt	'		'
Stated interest rate (as a percent)	4.50%		'
Effective rate (as a percent)	4.51%	[1]	'
Maturity Date	30-Jul-29	[2]	'
Future principal payments due on secured and unsecured debt	'		'
2014	0		'
2015	0		'
2016	0		'
2017	0		'
2018	0		'
Thereafter	300,000,000		'
Outstanding Balance	300,000,000		'
Unamortized Discounts	'		'
Future principal payments due on secured and unsecured debt	'		'
Unamortized discount	-2,710,000		'
Unamortized Discounts | 2014	'		'
Future principal payments due on secured and unsecured debt	'		'
Unamortized discount	-79,000		'
Unamortized Discounts | 2015	'		'
Future principal payments due on secured and unsecured debt	'		'
Unamortized discount	-326,000		'
Unamortized Discounts | 2016	'		'
Future principal payments due on secured and unsecured debt	'		'
Unamortized discount	-337,000		'
Unamortized Discounts | 2017	'		'
Future principal payments due on secured and unsecured debt	'		'
Unamortized discount	-350,000		'
Unamortized Discounts | 2018	'		'
Future principal payments due on secured and unsecured debt	'		'
Unamortized discount	-362,000		'
Unamortized Discounts | Thereafter	'		'
Future principal payments due on secured and unsecured debt	'		'
Unamortized discount	-1,256,000		'
Senior Notes [Member]	'		'
Summary of fixed rate/hedged and floating rate debt	'		'
Fixed Rate/Hedged Variable Rate	1,747,290,000		'
Unhedged Variable rate	0		'
Principal amount	1,747,290,000		'
Stated interest rate (as a percent)	3.50%		'
Effective rate (as a percent)	3.98%		'
Future principal payments due on secured and unsecured debt	'		'
Debt Instrument, Face Amount	$700,000,000		'
LIBOR | Secured notes payable maturing on 7/1/15	'		'
Summary of fixed rate/hedged and floating rate debt	'		'
Base rate	'LIBOR		'
Basis spread on LIBOR (as a percent)	1.50%		'
LIBOR | Secured notes payable maturing on 06/1/16	'		'
Summary of fixed rate/hedged and floating rate debt	'		'
Base rate	'LIBOR		'
Basis spread on LIBOR (as a percent)	1.40%		'
LIBOR | Secured notes payable maturing on 8/23/17	'		'
Summary of fixed rate/hedged and floating rate debt	'		'
Base rate	'LIBOR		'
Basis spread on LIBOR (as a percent)	1.35%		'
LIBOR | 2016 Unsecured Senior Bank Term Loan	'		'
Summary of fixed rate/hedged and floating rate debt	'		'
Base rate	'LIBOR		'
Basis spread on LIBOR (as a percent)	1.20%		'
LIBOR | 2019 Unsecured Senior Bank Term Loan	'		'
Summary of fixed rate/hedged and floating rate debt	'		'
Base rate	'LIBOR		'
Basis spread on LIBOR (as a percent)	1.20%		'
LIBOR | $1.5 billion unsecured senior line of credit	'		'
Summary of fixed rate/hedged and floating rate debt	'		'
Base rate	'LIBOR		'
Basis spread on LIBOR (as a percent)	1.10%	[3]	'
[1]	Represents the weighted average interest rate as of the end of the period plus the impact of debt premiums/discounts and our interest rate swap agreements. The weighted average interest rate excludes bank fees and amortization of loan fees.
[2]	Includes any extension options that we control.
[3]	In addition to the stated rate, the unsecured senior line of credit is subject to an annual facility fee of 0.20%.

Secured_and_unsecured_senior_d5

Secured and unsecured senior debt Unsecured senior notes payable (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Debt Instrument [Line Items]	'	'	'	'
Repayments of Unsecured Debt	'	'	$125,000,000	$250,000,000
Gains (Losses) on Extinguishment of Debt	-525,000	-1,432,000	-525,000	-1,992,000
Senior Notes [Member]	'	'	'	'
Debt Instrument [Line Items]	'	'	'	'
Debt Instrument, Face Amount	700,000,000	'	700,000,000	'
Stated interest rate (as a percent)	3.50%	'	3.50%	'
Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions	'	'	100.00%	'
Senior Notes [Member] | 2016 Unsecured Senior Bank Term Loan	'	'	'	'
Debt Instrument [Line Items]	'	'	'	'
Repayments of Unsecured Debt	'	'	125,000,000	'
Senior Notes [Member] | $1.5 billion unsecured senior line of credit	'	'	'	'
Debt Instrument [Line Items]	'	'	'	'
Repayments of Unsecured Debt	'	'	569,000,000	'
Unsecured Senior Notes Due in January 2020 [Member] | Senior Notes [Member]	'	'	'	'
Debt Instrument [Line Items]	'	'	'	'
Debt Instrument, Face Amount	400,000,000	'	400,000,000	'
Stated interest rate (as a percent)	2.80%	'	2.80%	'
Debt Instrument, Issuance Price as Percentage of Principal Amount	'	'	99.79%	'
Debt Instrument, Yield Rate	'	'	2.79%	'
Unsecured Senior Notes Due in July 2029 [Member] | Senior Notes [Member]	'	'	'	'
Debt Instrument [Line Items]	'	'	'	'
Debt Instrument, Face Amount	$300,000,000	'	$300,000,000	'
Stated interest rate (as a percent)	4.50%	'	4.50%	'
Debt Instrument, Issuance Price as Percentage of Principal Amount	'	'	99.91%	'
Debt Instrument, Yield Rate	'	'	4.51%	'

Secured_and_unsecured_senior_d6

Secured and unsecured senior debt Schedule of interest expense (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Interest expense incurred	'	'	'	'
Gross interest	$32,680	$32,959	$92,551	$96,668
Capitalized interest	-12,125	-16,788	-35,440	-46,499
Interest	$20,555	$16,171	$57,111	$50,169

Secured_and_unsecured_senior_d7

Secured and unsecured senior debt Repayment of secured note payable (Details) (USD $)	0 Months Ended
In Thousands, unless otherwise specified	Jan. 31, 2014	Sep. 30, 2014		Sep. 30, 2014		Aug. 01, 2014	Sep. 30, 2014		Aug. 01, 2014
	Alexandria Technology Square [Member]	Alexandria Technology Square [Member]		San Diego [Member]		San Diego [Member]	San Diego [Member]		San Diego [Member]
	Secured Debt from Insurance Company Maturing on 1 April 2014 [Member]	Secured Debt from Insurance Company Maturing on 1 April 2014 [Member]		Secured Debt from Bank Maturing on 1 July 2014 [Member]		Secured Debt from Bank Maturing on 1 July 2014 [Member]	Secured Debt from Bank Maturing on 1 November 2014 [Member]		Secured Debt from Bank Maturing on 1 November 2014 [Member]
Debt Instrument [Line Items]	'	'		'		'	'		'
Outstanding Balance	$208,700	'		'		$6,400	'		$7,400
Effective rate (as a percent)	'	5.59%	[1]	4.88%	[1]	'	4.00%	[1]	'
Proceeds from Contributions from Affiliates	$20,900	'		'		'	'		'
[1]	Represents the weighted average interest rate as of the end of the period plus the impact of debt premiums/discounts and our interest rate swap agreements. The weighted average interest rate excludes bank fees and amortization of loan fees.

Secured_and_unsecured_senior_d8

Secured and unsecured senior debt Schedule of secured construction loans (Details) (Construction Loans, USD $)	9 Months Ended
	Sep. 30, 2014
Debt Instrument [Line Items]	'
Outstanding Balance	$154,640,000
Remaining Commitment	186,760,000
Total Aggregate Commitments	341,400,000
San Franciso Bay Area [Member] | Secured notes payable maturing on 7/1/15	'
Debt Instrument [Line Items]	'
Maturity Date	1-Jul-15	[1]
Outstanding Balance	46,596,000
Remaining Commitment	8,404,000
Total Aggregate Commitments	55,000,000
San Franciso Bay Area [Member] | Secured notes payable maturing on 06/1/16	'
Debt Instrument [Line Items]	'
Maturity Date	1-Jun-16	[2]
Outstanding Balance	17,952,000
Remaining Commitment	18,048,000
Total Aggregate Commitments	36,000,000
Greater Boston market | Secured notes payable maturing on 8/23/17	'
Debt Instrument [Line Items]	'
Maturity Date	23-Aug-17	[3]
Outstanding Balance	90,092,000
Remaining Commitment	160,308,000
Total Aggregate Commitments	$250,400,000
LIBOR | San Franciso Bay Area [Member] | Secured notes payable maturing on 7/1/15	'
Debt Instrument [Line Items]	'
Base rate	'LIBOR
Applicable margin (as a percent)	1.50%
LIBOR | San Franciso Bay Area [Member] | Secured notes payable maturing on 06/1/16	'
Debt Instrument [Line Items]	'
Base rate	'LIBOR
Applicable margin (as a percent)	1.40%
LIBOR | Greater Boston market | Secured notes payable maturing on 8/23/17	'
Debt Instrument [Line Items]	'
Base rate	'LIBOR
Applicable margin (as a percent)	1.35%
[1]	We have two, one-year options to extend the stated maturity date to July 1, 2017, subject to certain conditions.
[2]	We have two, one-year options to extend the stated maturity date to June 1, 2018, subject to certain conditions.
[3]	We have a one-year option to extend the stated maturity date to August 23, 2018, subject to certain conditions.

Interest_rate_swap_agreements_1

Interest rate swap agreements (Details) (USD $)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'	'
The percentage of effectiveness of interest rate swap agreements	100.00%	100.00%
Interest rate swap hedge ineffectiveness recognized in earnings	$0	$0
Cash flow hedge loss to be reclassified within twelve month	2,100,000	'
Collateral obligation requirements	0	'
Interest Rate Derivative Liabilities, at Fair Value	287,000	'
Assets Needed for Immediate Settlement, Aggregate Fair Value	$800,000	'

Interest_rate_swap_agreements_2

Interest rate swap agreements Outstanding interest rate swap (Details) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014
Interest rate hedge agreements	'
Interest Rate Derivative Liabilities, at Fair Value	287
Fair Values	-287
Effective Portion of Interest Rate Cash Flow Hedge Derivatives	950,000
Notional Amount in Effect as of 12/31/14	950,000
Notional Amount in Effect as of 12/31/15	500,000
Notional Amount in Effect as of 12/31/16	500,000
Unsecured Bank Term Loan 2016 | Minimum	'
Interest rate hedge agreements	'
Applicable margin (as a percent)	1.20%
Unsecured Bank Term Loan 2016 | Unsecured Credit Facility [Member]	'
Interest rate hedge agreements	'
Applicable margin (as a percent)	1.10%
Transaction Date December 2013, Interest Pay Rate .980%	'
Interest rate hedge agreements	'
Number of Contracts	2
Interest Pay Rate (as a percent)	0.98%	[1]
Fair Values	-1,051
Effective Portion of Interest Rate Cash Flow Hedge Derivatives	500,000
Notional Amount in Effect as of 12/31/14	0
Notional Amount in Effect as of 12/31/15	0
Notional Amount in Effect as of 12/31/16	0
Interest Rate Hedge .23 Percent Transaction Date December 2013	'
Interest rate hedge agreements	'
Number of Contracts	2
Interest Pay Rate (as a percent)	0.23%	[1]
Fair Values	-110
Effective Portion of Interest Rate Cash Flow Hedge Derivatives	250,000
Notional Amount in Effect as of 12/31/14	250,000
Notional Amount in Effect as of 12/31/15	0
Notional Amount in Effect as of 12/31/16	0
Interest Rate Hedge .21 Percent Transaction Date March 2014 [Member]	'
Interest rate hedge agreements	'
Number of Contracts	4
Interest Pay Rate (as a percent)	0.21%	[1]
Fair Values	-61
Effective Portion of Interest Rate Cash Flow Hedge Derivatives	200,000
Notional Amount in Effect as of 12/31/14	200,000
Notional Amount in Effect as of 12/31/15	0
Notional Amount in Effect as of 12/31/16	0
Transaction date December 2014, interest pay rate 0.527%	'
Interest rate hedge agreements	'
Number of Contracts	3
Interest Pay Rate (as a percent)	0.53%	[1]
Fair Values	-23
Effective Portion of Interest Rate Cash Flow Hedge Derivatives	0
Notional Amount in Effect as of 12/31/14	500,000
Notional Amount in Effect as of 12/31/15	500,000
Notional Amount in Effect as of 12/31/16	0
Transaction date March 2016, interest pay rate 1.406%	'
Interest rate hedge agreements	'
Number of Contracts	3
Interest Pay Rate (as a percent)	1.40%	[1]
Fair Values	958
Effective Portion of Interest Rate Cash Flow Hedge Derivatives	0
Notional Amount in Effect as of 12/31/14	0
Notional Amount in Effect as of 12/31/15	0
Notional Amount in Effect as of 12/31/16	500,000
[1]	In addition to the interest pay rate, borrowings outstanding as of September 30, 2014, under our unsecured senior bank term loans include an applicable margin of 1.20% and borrowings outstanding under our unsecured senior line of credit include an applicable margin of 1.10%.

Fair_value_measurements_Assets

Fair value measurements Assets and Liabilities on Recurring Basis (Details) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Assets and liabilities measured at fair value on a recurring basis by level within the fair value hierarchy	'	'	'
Transfers in Fair Value Hierarchy	0	0	'
Assets:	'	'	'
“Available-for-sale” securities	$30,817	'	$4,469
Liabilities:	'	'	'
Interest rate swap agreements	287	'	'
Fair value measured on recurring basis | Fair Value	'	'	'
Assets:	'	'	'
“Available-for-sale” securities	30,817	'	4,469
Interest rate swap agreements	958	'	2,870
Liabilities:	'	'	'
Interest rate swap agreements	1,245	'	6,191
Fair value measured on recurring basis | Quoted Prices in Active Markets for Identical Assets	'	'	'
Assets:	'	'	'
“Available-for-sale” securities	30,817	'	4,469
Interest rate swap agreements	0	'	0
Liabilities:	'	'	'
Interest rate swap agreements	0	'	0
Fair value measured on recurring basis | Significant Other Observable Inputs	'	'	'
Assets:	'	'	'
“Available-for-sale” securities	0	'	0
Interest rate swap agreements	958	'	2,870
Liabilities:	'	'	'
Interest rate swap agreements	1,245	'	6,191
Fair value measured on recurring basis | Significant Other Observable Inputs	'	'	'
Assets:	'	'	'
“Available-for-sale” securities	0	'	0
Interest rate swap agreements	0	'	0
Liabilities:	'	'	'
Interest rate swap agreements	$0	'	$0

Fair_value_measurements_Book_a

Fair value measurements Book and Fair Values (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Summary of marketable securities, secured notes payable, unsecured senior line of credit, unsecured term loans, and unsecured senior convertible notes	'	'
“Available-for-sale” securities	$30,817	$4,469
Interest rate swap agreements	287	'
Book Value	'	'
Summary of marketable securities, secured notes payable, unsecured senior line of credit, unsecured term loans, and unsecured senior convertible notes	'	'
“Available-for-sale” securities	30,817	4,469
Interest rate swap agreements	958	2,870
Interest rate swap agreements	1,245	6,191
Secured notes payable	636,825	708,831
Unsecured senior line of credit	142,000	204,000
Fair Value	'	'
Summary of marketable securities, secured notes payable, unsecured senior line of credit, unsecured term loans, and unsecured senior convertible notes	'	'
“Available-for-sale” securities	30,817	4,469
Interest rate swap agreements	958	2,870
Interest rate swap agreements	1,245	6,191
Secured notes payable	686,388	736,772
Unsecured senior line of credit	141,881	193,714
Senior Notes [Member] | Book Value	'	'
Summary of marketable securities, secured notes payable, unsecured senior line of credit, unsecured term loans, and unsecured senior convertible notes	'	'
Debt Instrument, Fair Value Disclosure	1,747,290	1,048,230
Senior Notes [Member] | Fair Value	'	'
Summary of marketable securities, secured notes payable, unsecured senior line of credit, unsecured term loans, and unsecured senior convertible notes	'	'
Debt Instrument, Fair Value Disclosure	1,775,990	1,043,125
Unsecured Bank Term Loan 2016 | Book Value	'	'
Summary of marketable securities, secured notes payable, unsecured senior line of credit, unsecured term loans, and unsecured senior convertible notes	'	'
Debt Instrument, Fair Value Disclosure	975,000	1,100,000
Unsecured Bank Term Loan 2016 | Fair Value	'	'
Summary of marketable securities, secured notes payable, unsecured senior line of credit, unsecured term loans, and unsecured senior convertible notes	'	'
Debt Instrument, Fair Value Disclosure	$974,424	$1,099,897

Earnings_per_share_Details

Earnings per share (Details) (USD $)	3 Months Ended				9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Earnings per share	'		'		'		'
Income from continuing operations	$36,115		$32,496		$112,492		$94,212
Gain (Loss) on Sale of Properties, Net of Applicable Income Taxes	8		0		805		772
Dividends on preferred stock	-6,471		-6,472		-19,414		-19,414
Net income attributable to noncontrolling interests	-1,340		-960		-3,842		-2,922
Participating Securities, Distributed and Undistributed Earnings (Loss), Diluted	-506		-442		-1,285		-1,187
Income from continuing operations attributable to Alexandria Real Estate Equities, Inc.'s common stockholders - basic and diluted	27,806		24,622		88,756		71,461
(Loss) income from discontinued operations, net	-180	[1]	-43	[1]	-489	[1]	1,043	[1]
Net income attributable to Alexandria’s common stockholders	$27,626		$24,579		$88,267		$72,504
Weighted average shares of common stock outstanding – basic and diluted	71,195		70,900		71,121		67,040
Earnings per share attributable to Alexandria Real Estate Equities, Inc.'s common stockholders - basic and diluted:	'		'		'		'
Continuing operations	$0.39		$0.35		$1.25		$1.06
Discontinued operations	$0		$0		($0.01)		$0.02
Earnings per share – basic and diluted	$0.39		$0.35		$1.24		$1.08
[1]	includes the results of operations of four properties that were classified as “held for sale” as of September 30, 2014, as well as the results of operations (prior to disposition) and gain on sale of real estate attributable to seven properties sold during the period from January 1, 2013, to September 30, 2014. In October 2014, we completed the sale of one property which was classified as “held for sale” as of September 30, 2014.

Stockholders_equity_Details

Stockholders' equity (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Issuances of common stock	'	'	'	'
Dividends declared on common stock	$51,800	'	$153,669	'
Common Stock, Dividends, Per Share, Declared	$0.72	$0.68	$2.14	$1.93
Dividends declared on preferred stock	'	'	19,414	'
Preferred stock, shares authorized	100,000,000	'	100,000,000	'
Number of shares issued and outstanding	15,200,000	'	15,200,000	'
Number of "excess stock" authorized (in shares)	'	'	200,000,000	'
Number of excess stock authorized issued and outstanding (in shares)	0	'	0	'
Series D Preferred Stock	'	'	'	'
Issuances of common stock	'	'	'	'
Dividends declared on preferred stock	4,400	'	'	'
Dividends declared on preferred stock (dollar per share)	$0.44	'	'	'
Series E Cumulative Redeemable Preferred Stock	'	'	'	'
Issuances of common stock	'	'	'	'
Dividends declared on preferred stock	$2,100	'	'	'
Dividends declared on preferred stock (dollar per share)	$0.40	'	'	'

Stockholders_equity_Accumulate

Stockholders' equity Accumulated other comprehensive loss (Details) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014
Increase (Decrease) Accumulated Other Comprehensive Income (Loss) Net of Tax [Roll Forward]	'
Balance as of December 31, 2013	($36,204)
Other comprehensive income before reclassifications	1,433
Amounts reclassified from other comprehensive income	6,060
Net other comprehensive income	7,493
Balance as of June 30, 2014	-28,711
Unrealized Gain on Marketable Securities	'
Increase (Decrease) Accumulated Other Comprehensive Income (Loss) Net of Tax [Roll Forward]	'
Balance as of December 31, 2013	1,590
Other comprehensive income before reclassifications	13,591
Amounts reclassified from other comprehensive income	517
Net other comprehensive income	14,108
Balance as of June 30, 2014	15,698
Unrealized Loss on Interest Rate Swap Agreements	'
Increase (Decrease) Accumulated Other Comprehensive Income (Loss) Net of Tax [Roll Forward]	'
Balance as of December 31, 2013	-3,321
Other comprehensive income before reclassifications	-2,708
Amounts reclassified from other comprehensive income	5,742
Net other comprehensive income	3,034
Balance as of June 30, 2014	-287
Unrealized Loss on Foreign Currency Translation	'
Increase (Decrease) Accumulated Other Comprehensive Income (Loss) Net of Tax [Roll Forward]	'
Balance as of December 31, 2013	-34,473
Other comprehensive income before reclassifications	-9,450
Amounts reclassified from other comprehensive income	-199
Net other comprehensive income	-9,649
Balance as of June 30, 2014	($44,122)

Noncontrolling_interests_Detai

Noncontrolling interests (Details) (USD $)	3 Months Ended				9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Noncontrolling interests	'		'		'		'
Income (Loss) from Continuing Operations Attributable to Parent	$34,775		$31,536		$108,650		$91,290
(Loss) income from discontinued operations, net	($180)	[1]	($43)	[1]	($489)	[1]	$1,043	[1]
Noncontrolling Interests	'		'		'		'
Noncontrolling interests	'		'		'		'
Number of projects subject to ownership from noncontrolling interests	4		'		4		'
[1]	includes the results of operations of four properties that were classified as “held for sale” as of September 30, 2014, as well as the results of operations (prior to disposition) and gain on sale of real estate attributable to seven properties sold during the period from January 1, 2013, to September 30, 2014. In October 2014, we completed the sale of one property which was classified as “held for sale” as of September 30, 2014.

Discontinued_operations_Detail

Discontinued operations (Details) (USD $)	3 Months Ended				9 Months Ended				18 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013		Jun. 30, 2014	Dec. 31, 2013
					property				property
Discontinued Operations and Disposal Groups [Abstract]	'		'		'		'		'	'
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment	$7,648		'		$7,648		'		'	$7,644
Net assets of discontinued operations	'		'		'		'		'	'
Other assets	20		'		20		'		'	103
Total assets	7,668		'		7,668		'		'	7,747
Total liabilities	-172		'		-172		'		'	-266
Net assets of discontinued operations	7,496		'		7,496		'		'	7,481
Income from discontinued operations, net	'		'		'		'		'	'
Total revenues	0		319		0		4,658		'	'
Operating expenses	180		126		489		1,856		'	'
Total revenues less operating expenses from discontinued operations	-180		193		-489		2,802		'	'
Depreciation and Amortization, Discontinued Operations	0		236		0		1,638		'	'
(Gain) loss on sale of real estate	0		0		0		121		'	'
(Loss) income from discontinued operations	($180)	[1]	($43)	[1]	($489)	[1]	$1,043	[1]	'	'
Number of operating properties classified as held for sale	'		'		4		'		'	'
Number of properties sold	'		'		'		'		7	'
[1]	includes the results of operations of four properties that were classified as “held for sale” as of September 30, 2014, as well as the results of operations (prior to disposition) and gain on sale of real estate attributable to seven properties sold during the period from January 1, 2013, to September 30, 2014. In October 2014, we completed the sale of one property which was classified as “held for sale” as of September 30, 2014.

Condensed_consolidating_financ2

Condensed consolidating financial information Balance Sheet (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Assets	'	'	'	'
Investments in real estate, net	$7,197,630	$6,776,914	'	'
Cash and cash equivalents	67,023	57,696	53,839	140,971
Restricted cash	24,245	27,709	'	'
Tenant receivables	10,830	9,918	'	'
Deferred rent	225,506	190,425	'	'
Deferred leasing and financing costs, net	199,835	192,658	'	'
Marketable Securities	177,577	140,288	'	'
Investments in and advances to affiliates	0	0	'	'
Other assets	117,668	134,156	'	'
Total assets	8,020,314	7,529,764	'	'
Liabilities, Noncontrolling Interests, and Equity	'	'	'	'
Secured notes payable	636,825	708,831	'	'
Unsecured senior notes payable	1,747,290	1,048,230	'	'
Unsecured senior line of credit	142,000	204,000	'	'
Loans Payable to Bank	975,000	1,100,000	'	'
Accounts Payable and Accrued Liabilities	504,535	435,342	'	'
Dividends payable	57,549	54,420	'	'
Total liabilities	4,063,199	3,550,823	'	'
Redeemable noncontrolling interests	14,348	14,444	'	'
Alexandria Real Estate Equities, Inc.’s stockholders’ equity	3,875,198	3,916,789	'	'
Noncontrolling interests	67,569	47,708	'	'
Total equity	3,942,767	3,964,497	'	'
Total liabilities, noncontrolling interests, and equity	8,020,314	7,529,764	'	'
Alexandria Real Estate Equities, Inc. (Issuer)	'	'	'	'
Assets	'	'	'	'
Investments in real estate, net	0	0	'	'
Cash and cash equivalents	21,455	14,790	14,667	98,567
Restricted cash	70	55	'	'
Tenant receivables	0	0	'	'
Deferred rent	0	0	'	'
Deferred leasing and financing costs, net	37,486	36,901	'	'
Marketable Securities	0	0	'	'
Investments in and advances to affiliates	6,812,172	6,299,551	'	'
Other assets	19,244	20,226	'	'
Total assets	6,890,427	6,371,523	'	'
Liabilities, Noncontrolling Interests, and Equity	'	'	'	'
Secured notes payable	0	0	'	'
Unsecured senior notes payable	1,747,290	1,048,230	'	'
Unsecured senior line of credit	142,000	204,000	'	'
Loans Payable to Bank	975,000	1,100,000	'	'
Accounts Payable and Accrued Liabilities	93,679	48,373	'	'
Dividends payable	57,260	54,131	'	'
Total liabilities	3,015,229	2,454,734	'	'
Redeemable noncontrolling interests	0	0	'	'
Alexandria Real Estate Equities, Inc.’s stockholders’ equity	3,875,198	3,916,789	'	'
Noncontrolling interests	0	0	'	'
Total equity	3,875,198	3,916,789	'	'
Total liabilities, noncontrolling interests, and equity	6,890,427	6,371,523	'	'
Alexandria Real Estate Equities, L.P. (Guarantor Subsidiary)	'	'	'	'
Assets	'	'	'	'
Investments in real estate, net	0	0	'	'
Cash and cash equivalents	0	0	0	1,913
Restricted cash	0	0	'	'
Tenant receivables	0	0	'	'
Deferred rent	0	0	'	'
Deferred leasing and financing costs, net	0	0	'	'
Marketable Securities	8,147	10,868	'	'
Investments in and advances to affiliates	6,291,506	5,823,058	'	'
Other assets	0	0	'	'
Total assets	6,299,653	5,833,926	'	'
Liabilities, Noncontrolling Interests, and Equity	'	'	'	'
Secured notes payable	0	0	'	'
Unsecured senior notes payable	0	0	'	'
Unsecured senior line of credit	0	0	'	'
Loans Payable to Bank	0	0	'	'
Accounts Payable and Accrued Liabilities	0	0	'	'
Dividends payable	0	0	'	'
Total liabilities	0	0	'	'
Redeemable noncontrolling interests	0	0	'	'
Alexandria Real Estate Equities, Inc.’s stockholders’ equity	6,299,653	5,833,926	'	'
Noncontrolling interests	0	0	'	'
Total equity	6,299,653	5,833,926	'	'
Total liabilities, noncontrolling interests, and equity	6,299,653	5,833,926	'	'
Combined Non- Guarantor Subsidiaries	'	'	'	'
Assets	'	'	'	'
Investments in real estate, net	7,197,630	6,776,914	'	'
Cash and cash equivalents	45,568	42,906	39,172	40,491
Restricted cash	24,175	27,654	'	'
Tenant receivables	10,830	9,918	'	'
Deferred rent	225,506	190,425	'	'
Deferred leasing and financing costs, net	162,349	155,757	'	'
Marketable Securities	169,430	129,420	'	'
Investments in and advances to affiliates	129,268	119,421	'	'
Other assets	98,424	113,930	'	'
Total assets	8,063,180	7,566,345	'	'
Liabilities, Noncontrolling Interests, and Equity	'	'	'	'
Secured notes payable	636,825	708,831	'	'
Unsecured senior notes payable	0	0	'	'
Unsecured senior line of credit	0	0	'	'
Loans Payable to Bank	0	0	'	'
Accounts Payable and Accrued Liabilities	410,856	386,969	'	'
Dividends payable	289	289	'	'
Total liabilities	1,047,970	1,096,089	'	'
Redeemable noncontrolling interests	14,348	14,444	'	'
Alexandria Real Estate Equities, Inc.’s stockholders’ equity	6,933,293	6,408,104	'	'
Noncontrolling interests	67,569	47,708	'	'
Total equity	7,000,862	6,455,812	'	'
Total liabilities, noncontrolling interests, and equity	8,063,180	7,566,345	'	'
Eliminations	'	'	'	'
Assets	'	'	'	'
Investments in real estate, net	0	0	'	'
Cash and cash equivalents	0	0	0	0
Restricted cash	0	0	'	'
Tenant receivables	0	0	'	'
Deferred rent	0	0	'	'
Deferred leasing and financing costs, net	0	0	'	'
Marketable Securities	0	0	'	'
Investments in and advances to affiliates	-13,232,946	-12,242,030	'	'
Other assets	0	0	'	'
Total assets	-13,232,946	-12,242,030	'	'
Liabilities, Noncontrolling Interests, and Equity	'	'	'	'
Secured notes payable	0	0	'	'
Unsecured senior notes payable	0	0	'	'
Unsecured senior line of credit	0	0	'	'
Loans Payable to Bank	0	0	'	'
Accounts Payable and Accrued Liabilities	0	0	'	'
Dividends payable	0	0	'	'
Total liabilities	0	0	'	'
Redeemable noncontrolling interests	0	0	'	'
Alexandria Real Estate Equities, Inc.’s stockholders’ equity	-13,232,946	-12,242,030	'	'
Noncontrolling interests	0	0	'	'
Total equity	-13,232,946	-12,242,030	'	'
Total liabilities, noncontrolling interests, and equity	($13,232,946)	($12,242,030)	'	'

Condensed_consolidating_financ3

Condensed consolidating financial information Income Statement (Details) (USD $)	3 Months Ended				9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Revenues:	'		'		'		'
Rental	$137,718		$116,052		$403,280		$342,071
Tenant recoveries	45,572		38,691		128,198		110,125
Other Income	2,325		3,572		6,725		10,132
Total revenues	185,615		158,315		538,203		462,328
Expenses:	'		'		'		'
Rental operations	57,423		47,684		162,283		139,147
General and administrative	12,609		11,666		39,669		35,769
Interest	20,555		16,171		57,111		50,169
Depreciation and amortization	58,388		48,866		166,123		141,039
Gains (Losses) on Extinguishment of Debt	525		1,432		525		1,992
Total expenses	149,500		125,819		425,711		368,116
(Loss) income from continuing operations before equity in earnings of affiliates	36,115		32,496		112,492		94,212
Income (Loss) from Subsidiaries, before Tax	0		0		0		0
Income from continuing operations	36,115		32,496		112,492		94,212
(Loss) income from discontinued operations, net	-180	[1]	-43	[1]	-489	[1]	1,043	[1]
Gain (Loss) on Sale of Properties, Net of Applicable Income Taxes	8		0		805		772
Net income	35,943		32,453		112,808		96,027
Dividends on preferred stock	-6,471		-6,472		-19,414		-19,414
Net income attributable to noncontrolling interests	-1,340		-960		-3,842		-2,922
Participating Securities, Distributed and Undistributed Earnings (Loss), Diluted	-506		-442		-1,285		-1,187
Net Income (Loss) Available to Common Stockholders, Basic	27,626		24,579		88,267		72,504
Alexandria Real Estate Equities, Inc. (Issuer)	'		'		'		'
Revenues:	'		'		'		'
Rental	0		0		0		0
Tenant recoveries	0		0		0		0
Other Income	2,797		2,802		8,632		8,071
Total revenues	2,797		2,802		8,632		8,071
Expenses:	'		'		'		'
Rental operations	0		0		0		0
General and administrative	11,369		10,140		33,735		32,573
Interest	15,307		10,238		41,339		32,048
Depreciation and amortization	1,408		1,473		4,335		4,394
Gains (Losses) on Extinguishment of Debt	525		1,432		525		1,992
Total expenses	28,609		23,283		79,934		71,007
(Loss) income from continuing operations before equity in earnings of affiliates	-25,812		-20,481		-71,302		-62,936
Income (Loss) from Subsidiaries, before Tax	60,415		51,975		180,275		155,694
Income from continuing operations	34,603		31,494		108,973		92,758
(Loss) income from discontinued operations, net	0		-1		-7		347
Gain (Loss) on Sale of Properties, Net of Applicable Income Taxes	0		'		0		0
Net income	34,603		31,493		108,966		93,105
Dividends on preferred stock	-6,471		-6,472		-19,414		-19,414
Net income attributable to noncontrolling interests	0		0		0		0
Participating Securities, Distributed and Undistributed Earnings (Loss), Diluted	-506		-442		-1,285		-1,187
Net Income (Loss) Available to Common Stockholders, Basic	27,626		24,579		88,267		72,504
Alexandria Real Estate Equities, L.P. (Guarantor Subsidiary)	'		'		'		'
Revenues:	'		'		'		'
Rental	0		0		0		0
Tenant recoveries	0		0		0		0
Other Income	-1,264		-1		-2,799		-142
Total revenues	-1,264		-1		-2,799		-142
Expenses:	'		'		'		'
Rental operations	0		0		0		0
General and administrative	0		0		0		0
Interest	0		0		0		0
Depreciation and amortization	0		0		0		0
Gains (Losses) on Extinguishment of Debt	0		0		0		0
Total expenses	0		0		0		0
(Loss) income from continuing operations before equity in earnings of affiliates	-1,264		-1		-2,799		-142
Income (Loss) from Subsidiaries, before Tax	58,381		48,477		172,989		144,660
Income from continuing operations	57,117		48,476		170,190		144,518
(Loss) income from discontinued operations, net	0		0		0		0
Gain (Loss) on Sale of Properties, Net of Applicable Income Taxes	0		'		0		0
Net income	57,117		48,476		170,190		144,518
Dividends on preferred stock	0		0		0		0
Net income attributable to noncontrolling interests	0		0		0		0
Participating Securities, Distributed and Undistributed Earnings (Loss), Diluted	0		0		0		0
Net Income (Loss) Available to Common Stockholders, Basic	57,117		48,476		170,190		144,518
Combined Non- Guarantor Subsidiaries	'		'		'		'
Revenues:	'		'		'		'
Rental	137,718		116,052		403,280		342,071
Tenant recoveries	45,572		38,691		128,198		110,125
Other Income	4,369		3,966		11,534		11,635
Total revenues	187,659		158,709		543,012		463,831
Expenses:	'		'		'		'
Rental operations	57,423		47,684		162,283		139,147
General and administrative	4,817		4,721		16,576		12,628
Interest	5,248		5,933		15,772		18,121
Depreciation and amortization	56,980		47,393		161,788		136,645
Gains (Losses) on Extinguishment of Debt	0		0		0		0
Total expenses	124,468		105,731		356,419		306,541
(Loss) income from continuing operations before equity in earnings of affiliates	63,191		52,978		186,593		157,290
Income (Loss) from Subsidiaries, before Tax	1,127		959		3,356		2,858
Income from continuing operations	64,318		53,937		189,949		160,148
(Loss) income from discontinued operations, net	-180		-42		-482		696
Gain (Loss) on Sale of Properties, Net of Applicable Income Taxes	8		'		805		772
Net income	64,146		53,895		190,272		161,616
Dividends on preferred stock	0		0		0		0
Net income attributable to noncontrolling interests	-1,340		-960		-3,842		-2,922
Participating Securities, Distributed and Undistributed Earnings (Loss), Diluted	0		0		0		0
Net Income (Loss) Available to Common Stockholders, Basic	62,806		52,935		186,430		158,694
Eliminations	'		'		'		'
Revenues:	'		'		'		'
Rental	0		0		0		0
Tenant recoveries	0		0		0		0
Other Income	-3,577		-3,195		-10,642		-9,432
Total revenues	-3,577		-3,195		-10,642		-9,432
Expenses:	'		'		'		'
Rental operations	0		0		0		0
General and administrative	-3,577		-3,195		-10,642		-9,432
Interest	0		0		0		0
Depreciation and amortization	0		0		0		0
Gains (Losses) on Extinguishment of Debt	0		0		0		0
Total expenses	-3,577		-3,195		-10,642		-9,432
(Loss) income from continuing operations before equity in earnings of affiliates	0		0		0		0
Income (Loss) from Subsidiaries, before Tax	-119,923		-101,411		-356,620		-303,212
Income from continuing operations	-119,923		-101,411		-356,620		-303,212
(Loss) income from discontinued operations, net	0		0		0		0
Gain (Loss) on Sale of Properties, Net of Applicable Income Taxes	0		'		0		0
Net income	-119,923		-101,411		-356,620		-303,212
Dividends on preferred stock	0		0		0		0
Net income attributable to noncontrolling interests	0		0		0		0
Participating Securities, Distributed and Undistributed Earnings (Loss), Diluted	0		0		0		0
Net Income (Loss) Available to Common Stockholders, Basic	($119,923)		($101,411)		($356,620)		($303,212)
[1]	includes the results of operations of four properties that were classified as “held for sale” as of September 30, 2014, as well as the results of operations (prior to disposition) and gain on sale of real estate attributable to seven properties sold during the period from January 1, 2013, to September 30, 2014. In October 2014, we completed the sale of one property which was classified as “held for sale” as of September 30, 2014.

Condensed_consolidating_financ4

Condensed consolidating financial information Comprehensive Income (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Net income	$35,943	$32,453	$112,808	$96,027
Unrealized gains (losses) on marketable securities:	'	'	'	'
Unrealized holding (losses) gains arising during the period	-2,454	-37	13,591	323
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax	111	-250	517	-480
Unrealized (losses) gains on marketable securities, net	-2,343	-287	14,108	-157
Unrealized (losses) gains on interest rate swap agreements:	'	'	'	'
Unrealized interest rate swap losses arising during the period	1,206	-676	-2,708	-704
Reclassification adjustment for amortization of interest expense included in net income	1,129	3,904	5,742	12,046
Unrealized gains on interest rate swap agreements, net	2,335	3,228	3,034	11,342
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	-12,259	-3,404	-9,450	-26,461
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax	-199	0	-199	0
Foreign currency translation gains (losses)	-12,458	-3,404	-9,649	-26,461
Total other comprehensive income (loss)	-12,466	-463	7,493	-15,276
Comprehensive income	23,477	31,990	120,301	80,751
Less: comprehensive income attributable to noncontrolling interests	-1,340	-933	-3,842	-2,839
Comprehensive income attributable to Alexandria’s common stockholders	22,137	31,057	116,459	77,912
Alexandria Real Estate Equities, Inc. (Issuer)	'	'	'	'
Net income	34,603	31,493	108,966	93,105
Unrealized gains (losses) on marketable securities:	'	'	'	'
Unrealized holding (losses) gains arising during the period	0	0	0	0
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax	0	0	0	0
Unrealized (losses) gains on marketable securities, net	0	0	0	0
Unrealized (losses) gains on interest rate swap agreements:	'	'	'	'
Unrealized interest rate swap losses arising during the period	1,206	-676	-2,708	-704
Reclassification adjustment for amortization of interest expense included in net income	1,129	3,904	5,742	12,046
Unrealized gains on interest rate swap agreements, net	2,335	3,228	3,034	11,342
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	0	'	0	'
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax	0	'	0	'
Foreign currency translation gains (losses)	0	0	0	0
Total other comprehensive income (loss)	2,335	3,228	3,034	11,342
Comprehensive income	36,938	34,721	112,000	104,447
Less: comprehensive income attributable to noncontrolling interests	0	0	0	0
Comprehensive income attributable to Alexandria’s common stockholders	36,938	34,721	112,000	104,447
Alexandria Real Estate Equities, L.P. (Guarantor Subsidiary)	'	'	'	'
Net income	57,117	48,476	170,190	144,518
Unrealized gains (losses) on marketable securities:	'	'	'	'
Unrealized holding (losses) gains arising during the period	-310	-796	0	-391
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax	0	519	0	144
Unrealized (losses) gains on marketable securities, net	-310	-277	0	-247
Unrealized (losses) gains on interest rate swap agreements:	'	'	'	'
Unrealized interest rate swap losses arising during the period	0	0	0	0
Reclassification adjustment for amortization of interest expense included in net income	0	0	0	0
Unrealized gains on interest rate swap agreements, net	0	0	0	0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	0	'	0	'
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax	0	'	0	'
Foreign currency translation gains (losses)	0	0	0	0
Total other comprehensive income (loss)	-310	-277	0	-247
Comprehensive income	56,807	48,199	170,190	144,271
Less: comprehensive income attributable to noncontrolling interests	0	0	0	0
Comprehensive income attributable to Alexandria’s common stockholders	56,807	48,199	170,190	144,271
Combined Non- Guarantor Subsidiaries	'	'	'	'
Net income	64,146	53,895	190,272	161,616
Unrealized gains (losses) on marketable securities:	'	'	'	'
Unrealized holding (losses) gains arising during the period	-2,144	759	13,591	714
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax	111	-769	517	-624
Unrealized (losses) gains on marketable securities, net	-2,033	-10	14,108	90
Unrealized (losses) gains on interest rate swap agreements:	'	'	'	'
Unrealized interest rate swap losses arising during the period	0	0	0	0
Reclassification adjustment for amortization of interest expense included in net income	0	0	0	0
Unrealized gains on interest rate swap agreements, net	0	0	0	0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	-12,259	'	-9,450	'
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax	-199	'	-199	'
Foreign currency translation gains (losses)	-12,458	-3,404	-9,649	-26,461
Total other comprehensive income (loss)	-14,491	-3,414	4,459	-26,371
Comprehensive income	49,655	50,481	194,731	135,245
Less: comprehensive income attributable to noncontrolling interests	-1,340	-933	-3,842	-2,839
Comprehensive income attributable to Alexandria’s common stockholders	48,315	49,548	190,889	132,406
Eliminations	'	'	'	'
Net income	-119,923	-101,411	-356,620	-303,212
Unrealized gains (losses) on marketable securities:	'	'	'	'
Unrealized holding (losses) gains arising during the period	0	0	0	0
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax	0	0	0	0
Unrealized (losses) gains on marketable securities, net	0	0	0	0
Unrealized (losses) gains on interest rate swap agreements:	'	'	'	'
Unrealized interest rate swap losses arising during the period	0	0	0	0
Reclassification adjustment for amortization of interest expense included in net income	0	0	0	0
Unrealized gains on interest rate swap agreements, net	0	0	0	0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	0	'	0	'
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax	0	'	0	'
Foreign currency translation gains (losses)	0	0	0	0
Total other comprehensive income (loss)	0	0	0	0
Comprehensive income	-119,923	-101,411	-356,620	-303,212
Less: comprehensive income attributable to noncontrolling interests	0	0	0	0
Comprehensive income attributable to Alexandria’s common stockholders	($119,923)	($101,411)	($356,620)	($303,212)

Condensed_consolidating_financ5

Condensed consolidating financial information Cash Flows (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Operating Activities	'	'	'	'
Net income	$35,943	$32,453	$112,808	$96,027
Depreciation, Depletion and Amortization	'	'	166,123	142,677
Adjustments to reconcile net income to net cash provided by operating activities:	'	'	'	'
Gains (Losses) on Extinguishment of Debt	525	1,432	525	1,992
Gain (Loss) on Sale of Properties, Net of Applicable Income Taxes	-8	0	-805	-772
Loss on sale of real estate	0	0	0	121
Amortization of loan fees and costs	'	'	8,090	7,300
Amortization of debt premiums/discounts	'	'	100	383
Amortization of above and below Market Leases	'	'	-2,191	-2,490
Deferred rent	'	'	-35,511	-20,007
Stock compensation expense	'	'	9,372	11,541
Equity in income related to subsidiaries	'	'	0	0
Investment gains	-3,256	-2,050	-9,481	-4,716
Investment losses	3,485	0	8,725	529
Changes in operating assets and liabilities:	'	'	'	'
Restricted cash	'	'	0	1,243
Tenant receivables	'	'	-939	-271
Deferred leasing costs	'	'	-25,910	-37,190
Other assets	'	'	-12,228	-11,428
Intercompany receivables and payables	'	'	'	0
Accounts payable, accrued expenses, and tenant security deposits	'	'	36,446	51,437
Net cash (used in) provided by operating activities	'	'	255,124	236,376
Investing Activities	'	'	'	'
Proceeds from sale of properties	'	'	28,378	101,815
Additions to properties	'	'	-345,074	-450,140
Purchase of properties	'	'	-97,785	-24,537
Payments for (Proceeds from) Deposits on Real Estate Acquisitions	'	'	-7,292	0
Change in restricted cash related to construction projects	'	'	6,694	5,711
Contributions to unconsolidated real estate entity	'	'	-67,525	-13,881
Investments in subsidiaries	'	'	0	0
Additions to investments	'	'	-35,484	-22,835
Proceeds from investments	'	'	13,883	12,750
Proceeds from Collection of Notes Receivable	'	'	29,866	0
Net cash (used in) provided by investing activities	'	'	-474,339	-391,117
Financing Activities	'	'	'	'
Borrowings from secured notes payable	'	'	108,626	26,319
Repayments of borrowings from secured notes payable	'	'	-228,909	-34,120
Proceeds from Issuance of Unsecured Debt	'	'	698,908	498,561
Principal borrowings from unsecured senior line of credit	'	'	890,000	319,000
Repayments of borrowings from unsecured senior line of credit	'	'	-952,000	-871,000
Repayments of Unsecured Debt	'	'	-125,000	-250,000
Repayments of Convertible Debt	'	'	0	-384
Transfers to/from parent company	'	'	0	0
Change in restricted cash related to financings	'	'	375	923
Deferred financing costs paid	'	'	-7,989	-16,247
Proceeds from Issuance of Common Stock	'	'	0	535,686
Dividends paid on common stock	'	'	-150,540	-120,367
Dividends paid on preferred stock	'	'	-19,414	-19,414
Proceeds from Noncontrolling Interests	'	'	19,410	0
Noncontrolling Interest, Increase from Subsidiary Equity Issuance	'	'	19,410	'
Payments of Distributions to Affiliates	'	'	-893	0
Distributions to noncontrolling interests	'	'	-2,594	-2,100
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	'	'	2,594	'
Net cash provided by (used in) financing activities	'	'	229,980	66,857
Effect of foreign exchange rate changes on cash and cash equivalents	'	'	-1,438	752
Net increase in cash and cash equivalents	'	'	9,327	-87,132
Cash and cash equivalents at beginning of period	'	'	57,696	140,971
Cash and cash equivalents at end of period	67,023	53,839	67,023	53,839
Supplemental Disclosure of Cash Flow Information	'	'	'	'
Cash paid during the period for interest, net of interest capitalized	'	'	33,783	34,281
Non-Cash Investing Activities	'	'	'	'
Note receivable from sale of real estate	'	'	0	38,820
Assumption of secured notes payable in connection with purchase of properties	'	'	48,329	0
Alexandria Real Estate Equities, Inc. (Issuer)	'	'	'	'
Operating Activities	'	'	'	'
Net income	34,603	31,493	108,966	93,105
Depreciation, Depletion and Amortization	'	'	4,335	4,393
Adjustments to reconcile net income to net cash provided by operating activities:	'	'	'	'
Gains (Losses) on Extinguishment of Debt	525	1,432	525	1,992
Gain (Loss) on Sale of Properties, Net of Applicable Income Taxes	0	'	0	0
Loss on sale of real estate	'	'	'	0
Amortization of loan fees and costs	'	'	5,424	5,148
Amortization of debt premiums/discounts	'	'	152	75
Amortization of above and below Market Leases	'	'	0	0
Deferred rent	'	'	0	0
Stock compensation expense	'	'	9,372	11,541
Equity in income related to subsidiaries	'	'	-180,275	-155,694
Investment gains	'	'	0	0
Investment losses	'	'	0	0
Changes in operating assets and liabilities:	'	'	'	'
Restricted cash	'	'	-15	-8
Tenant receivables	'	'	0	1
Deferred leasing costs	'	'	-80	2,421
Other assets	'	'	-5,263	-5,570
Intercompany receivables and payables	'	'	'	3,021
Accounts payable, accrued expenses, and tenant security deposits	'	'	50,210	-9,599
Net cash (used in) provided by operating activities	'	'	-6,649	-49,174
Investing Activities	'	'	'	'
Proceeds from sale of properties	'	'	0	10,796
Additions to properties	'	'	0	3,539
Purchase of properties	'	'	0	0
Payments for (Proceeds from) Deposits on Real Estate Acquisitions	'	'	0	'
Change in restricted cash related to construction projects	'	'	0	0
Contributions to unconsolidated real estate entity	'	'	0	0
Investments in subsidiaries	'	'	-322,228	-126,967
Additions to investments	'	'	0	0
Proceeds from investments	'	'	0	0
Proceeds from Collection of Notes Receivable	'	'	0	'
Net cash (used in) provided by investing activities	'	'	-322,228	-112,632
Financing Activities	'	'	'	'
Borrowings from secured notes payable	'	'	0	0
Repayments of borrowings from secured notes payable	'	'	0	0
Proceeds from Issuance of Unsecured Debt	'	'	698,908	498,561
Principal borrowings from unsecured senior line of credit	'	'	890,000	319,000
Repayments of borrowings from unsecured senior line of credit	'	'	-952,000	-871,000
Repayments of Unsecured Debt	'	'	-125,000	-250,000
Repayments of Convertible Debt	'	'	'	-384
Transfers to/from parent company	'	'	103	0
Change in restricted cash related to financings	'	'	0	-1
Deferred financing costs paid	'	'	-6,515	-14,175
Proceeds from Issuance of Common Stock	'	'	'	535,686
Dividends paid on common stock	'	'	-150,540	-120,367
Dividends paid on preferred stock	'	'	-19,414	-19,414
Proceeds from Noncontrolling Interests	'	'	0	'
Payments of Distributions to Affiliates	'	'	0	'
Distributions to noncontrolling interests	'	'	0	0
Net cash provided by (used in) financing activities	'	'	335,542	77,906
Effect of foreign exchange rate changes on cash and cash equivalents	'	'	0	0
Net increase in cash and cash equivalents	'	'	6,665	-83,900
Cash and cash equivalents at beginning of period	'	'	14,790	98,567
Cash and cash equivalents at end of period	21,455	14,667	21,455	14,667
Supplemental Disclosure of Cash Flow Information	'	'	'	'
Cash paid during the period for interest, net of interest capitalized	'	'	20,089	16,569
Non-Cash Investing Activities	'	'	'	'
Note receivable from sale of real estate	'	'	'	29,820
Assumption of secured notes payable in connection with purchase of properties	'	'	0	'
Alexandria Real Estate Equities, L.P. (Guarantor Subsidiary)	'	'	'	'
Operating Activities	'	'	'	'
Net income	57,117	48,476	170,190	144,518
Depreciation, Depletion and Amortization	'	'	0	0
Adjustments to reconcile net income to net cash provided by operating activities:	'	'	'	'
Gains (Losses) on Extinguishment of Debt	0	0	0	0
Gain (Loss) on Sale of Properties, Net of Applicable Income Taxes	0	'	0	0
Loss on sale of real estate	'	'	'	0
Amortization of loan fees and costs	'	'	0	0
Amortization of debt premiums/discounts	'	'	0	0
Amortization of above and below Market Leases	'	'	0	0
Deferred rent	'	'	0	0
Stock compensation expense	'	'	0	0
Equity in income related to subsidiaries	'	'	-172,989	-144,660
Investment gains	'	'	-3	-152
Investment losses	'	'	2,802	298
Changes in operating assets and liabilities:	'	'	'	'
Restricted cash	'	'	0	0
Tenant receivables	'	'	0	0
Deferred leasing costs	'	'	0	0
Other assets	'	'	0	0
Intercompany receivables and payables	'	'	'	0
Accounts payable, accrued expenses, and tenant security deposits	'	'	0	0
Net cash (used in) provided by operating activities	'	'	0	4
Investing Activities	'	'	'	'
Proceeds from sale of properties	'	'	0	0
Additions to properties	'	'	0	0
Purchase of properties	'	'	0	0
Payments for (Proceeds from) Deposits on Real Estate Acquisitions	'	'	0	'
Change in restricted cash related to construction projects	'	'	0	0
Contributions to unconsolidated real estate entity	'	'	0	0
Investments in subsidiaries	'	'	-291,300	-170,033
Additions to investments	'	'	0	0
Proceeds from investments	'	'	0	1,594
Proceeds from Collection of Notes Receivable	'	'	0	'
Net cash (used in) provided by investing activities	'	'	-291,300	-168,439
Financing Activities	'	'	'	'
Borrowings from secured notes payable	'	'	0	0
Repayments of borrowings from secured notes payable	'	'	0	0
Proceeds from Issuance of Unsecured Debt	'	'	0	0
Principal borrowings from unsecured senior line of credit	'	'	0	0
Repayments of borrowings from unsecured senior line of credit	'	'	0	0
Repayments of Unsecured Debt	'	'	0	0
Repayments of Convertible Debt	'	'	'	0
Transfers to/from parent company	'	'	291,300	166,522
Change in restricted cash related to financings	'	'	0	0
Deferred financing costs paid	'	'	0	0
Proceeds from Issuance of Common Stock	'	'	'	0
Dividends paid on common stock	'	'	0	0
Dividends paid on preferred stock	'	'	0	0
Proceeds from Noncontrolling Interests	'	'	0	'
Payments of Distributions to Affiliates	'	'	0	'
Distributions to noncontrolling interests	'	'	0	0
Net cash provided by (used in) financing activities	'	'	291,300	166,522
Effect of foreign exchange rate changes on cash and cash equivalents	'	'	0	0
Net increase in cash and cash equivalents	'	'	0	-1,913
Cash and cash equivalents at beginning of period	'	'	0	1,913
Cash and cash equivalents at end of period	0	0	0	0
Supplemental Disclosure of Cash Flow Information	'	'	'	'
Cash paid during the period for interest, net of interest capitalized	'	'	0	0
Non-Cash Investing Activities	'	'	'	'
Note receivable from sale of real estate	'	'	'	0
Assumption of secured notes payable in connection with purchase of properties	'	'	0	'
Combined Non- Guarantor Subsidiaries	'	'	'	'
Operating Activities	'	'	'	'
Net income	64,146	53,895	190,272	161,616
Depreciation, Depletion and Amortization	'	'	161,788	138,284
Adjustments to reconcile net income to net cash provided by operating activities:	'	'	'	'
Gains (Losses) on Extinguishment of Debt	0	0	0	0
Gain (Loss) on Sale of Properties, Net of Applicable Income Taxes	-8	'	-805	-772
Loss on sale of real estate	'	'	'	121
Amortization of loan fees and costs	'	'	2,666	2,152
Amortization of debt premiums/discounts	'	'	-52	308
Amortization of above and below Market Leases	'	'	-2,191	-2,490
Deferred rent	'	'	-35,511	-20,007
Stock compensation expense	'	'	0	0
Equity in income related to subsidiaries	'	'	-3,356	-2,858
Investment gains	'	'	-9,478	-4,564
Investment losses	'	'	5,923	231
Changes in operating assets and liabilities:	'	'	'	'
Restricted cash	'	'	15	1,251
Tenant receivables	'	'	-939	-272
Deferred leasing costs	'	'	-25,830	-39,611
Other assets	'	'	-6,965	-5,858
Intercompany receivables and payables	'	'	'	-3,021
Accounts payable, accrued expenses, and tenant security deposits	'	'	-13,764	61,036
Net cash (used in) provided by operating activities	'	'	261,773	285,546
Investing Activities	'	'	'	'
Proceeds from sale of properties	'	'	28,378	91,019
Additions to properties	'	'	-345,074	-453,679
Purchase of properties	'	'	-97,785	-24,537
Payments for (Proceeds from) Deposits on Real Estate Acquisitions	'	'	-7,292	'
Change in restricted cash related to construction projects	'	'	6,694	5,711
Contributions to unconsolidated real estate entity	'	'	-67,525	-13,881
Investments in subsidiaries	'	'	-12,150	-3,045
Additions to investments	'	'	-35,484	-22,835
Proceeds from investments	'	'	13,883	11,156
Proceeds from Collection of Notes Receivable	'	'	29,866	'
Net cash (used in) provided by investing activities	'	'	-486,489	-410,091
Financing Activities	'	'	'	'
Borrowings from secured notes payable	'	'	108,626	26,319
Repayments of borrowings from secured notes payable	'	'	-228,909	-34,120
Proceeds from Issuance of Unsecured Debt	'	'	0	0
Principal borrowings from unsecured senior line of credit	'	'	0	0
Repayments of borrowings from unsecured senior line of credit	'	'	0	0
Repayments of Unsecured Debt	'	'	0	0
Repayments of Convertible Debt	'	'	'	0
Transfers to/from parent company	'	'	334,275	133,523
Change in restricted cash related to financings	'	'	375	924
Deferred financing costs paid	'	'	-1,474	-2,072
Proceeds from Issuance of Common Stock	'	'	'	0
Dividends paid on common stock	'	'	0	0
Dividends paid on preferred stock	'	'	0	0
Proceeds from Noncontrolling Interests	'	'	19,410	'
Payments of Distributions to Affiliates	'	'	-893	'
Distributions to noncontrolling interests	'	'	-2,594	-2,100
Net cash provided by (used in) financing activities	'	'	228,816	122,474
Effect of foreign exchange rate changes on cash and cash equivalents	'	'	-1,438	752
Net increase in cash and cash equivalents	'	'	2,662	-1,319
Cash and cash equivalents at beginning of period	'	'	42,906	40,491
Cash and cash equivalents at end of period	45,568	39,172	45,568	39,172
Supplemental Disclosure of Cash Flow Information	'	'	'	'
Cash paid during the period for interest, net of interest capitalized	'	'	13,694	17,712
Non-Cash Investing Activities	'	'	'	'
Note receivable from sale of real estate	'	'	'	9,000
Assumption of secured notes payable in connection with purchase of properties	'	'	-48,329	'
Eliminations	'	'	'	'
Operating Activities	'	'	'	'
Net income	-119,923	-101,411	-356,620	-303,212
Depreciation, Depletion and Amortization	'	'	0	0
Adjustments to reconcile net income to net cash provided by operating activities:	'	'	'	'
Gains (Losses) on Extinguishment of Debt	0	0	0	0
Gain (Loss) on Sale of Properties, Net of Applicable Income Taxes	0	'	0	0
Loss on sale of real estate	'	'	'	0
Amortization of loan fees and costs	'	'	0	0
Amortization of debt premiums/discounts	'	'	0	0
Amortization of above and below Market Leases	'	'	0	0
Deferred rent	'	'	0	0
Stock compensation expense	'	'	0	0
Equity in income related to subsidiaries	'	'	356,620	303,212
Investment gains	'	'	0	0
Investment losses	'	'	0	0
Changes in operating assets and liabilities:	'	'	'	'
Restricted cash	'	'	0	0
Tenant receivables	'	'	0	0
Deferred leasing costs	'	'	0	0
Other assets	'	'	0	0
Intercompany receivables and payables	'	'	'	0
Accounts payable, accrued expenses, and tenant security deposits	'	'	0	0
Net cash (used in) provided by operating activities	'	'	0	0
Investing Activities	'	'	'	'
Proceeds from sale of properties	'	'	0	0
Additions to properties	'	'	0	0
Purchase of properties	'	'	0	0
Payments for (Proceeds from) Deposits on Real Estate Acquisitions	'	'	0	'
Change in restricted cash related to construction projects	'	'	0	0
Contributions to unconsolidated real estate entity	'	'	0	0
Investments in subsidiaries	'	'	625,678	300,045
Additions to investments	'	'	0	0
Proceeds from investments	'	'	0	0
Proceeds from Collection of Notes Receivable	'	'	0	'
Net cash (used in) provided by investing activities	'	'	625,678	300,045
Financing Activities	'	'	'	'
Borrowings from secured notes payable	'	'	0	0
Repayments of borrowings from secured notes payable	'	'	0	0
Proceeds from Issuance of Unsecured Debt	'	'	0	0
Principal borrowings from unsecured senior line of credit	'	'	0	0
Repayments of borrowings from unsecured senior line of credit	'	'	0	0
Repayments of Unsecured Debt	'	'	0	0
Repayments of Convertible Debt	'	'	'	0
Transfers to/from parent company	'	'	-625,678	-300,045
Change in restricted cash related to financings	'	'	0	0
Deferred financing costs paid	'	'	0	0
Proceeds from Issuance of Common Stock	'	'	'	0
Dividends paid on common stock	'	'	0	0
Dividends paid on preferred stock	'	'	0	0
Proceeds from Noncontrolling Interests	'	'	0	'
Payments of Distributions to Affiliates	'	'	0	'
Distributions to noncontrolling interests	'	'	0	0
Net cash provided by (used in) financing activities	'	'	-625,678	-300,045
Effect of foreign exchange rate changes on cash and cash equivalents	'	'	0	0
Net increase in cash and cash equivalents	'	'	0	0
Cash and cash equivalents at beginning of period	'	'	0	0
Cash and cash equivalents at end of period	0	0	0	0
Supplemental Disclosure of Cash Flow Information	'	'	'	'
Cash paid during the period for interest, net of interest capitalized	'	'	0	0
Non-Cash Investing Activities	'	'	'	'
Note receivable from sale of real estate	'	'	'	0
Assumption of secured notes payable in connection with purchase of properties	'	'	$0	'