Alexandria Real Estate Equities (ARE) 10-Q 8 May 14 2014 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 31, 2014	Apr. 30, 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	31-Mar-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	'	71,649,262
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q1	'

Consolidated_Balance_Sheets_Un

Consolidated Balance Sheets (Unaudited) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Assets	'	'
Investments in real estate, net	$6,930,262	$6,776,914
Cash and cash equivalents	74,970	57,696
Restricted cash	30,454	27,709
Tenant receivables	10,619	9,918
Deferred rent	202,087	190,425
Deferred leasing and financing costs, net	192,618	192,658
Investments	169,322	140,288
Other assets	145,707	134,156
Total assets	7,756,039	7,529,764
Liabilities, Noncontrolling Interests, and Equity	'	'
Secured notes payable	597,511	708,831
Unsecured senior notes payable	1,048,270	1,048,230
Unsecured senior line of credit	506,000	204,000
Unsecured senior bank term loans	1,100,000	1,100,000
Accounts payable, accrued expenses, and tenant security deposits	443,893	435,342
Dividends payable	55,860	54,420
Total liabilities	3,751,534	3,550,823
Commitments and contingencies	'	'
Redeemable noncontrolling interests	14,413	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	712	712
Additional paid-in capital	3,560,453	3,572,281
Accumulated other comprehensive loss	-18,429	-36,204
Alexandria’s stockholders’ equity	3,922,736	3,916,789
Noncontrolling interests	67,356	47,708
Total equity	3,990,092	3,964,497
Total liabilities, noncontrolling interests, and equity	$7,756,039	$7,529,764

Consolidated_Statements_of_Inc

Consolidated Statements of Income (Unaudited) (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2014		Mar. 31, 2013
Revenues:	'		'
Rental	$130,570		$111,526
Tenant recoveries	41,682		35,565
Other Income	3,934		2,992
Total revenues	176,186		150,083
Expenses:	'		'
Rental operations	52,507		45,186
General and administrative	13,224		11,648
Interest	19,123		18,020
Depreciation and amortization	50,421		45,829
Total expenses	135,275		120,683
Income from continuing operations	40,911		29,400
Income from discontinued operations:	'		'
(Loss) income from discontinued operations	-162	[1]	837	[1]
Net income	40,749		30,237
Net income attributable to noncontrolling interests	1,195		982
Dividends on preferred stock	6,471		6,471
Net income attributable to unvested restricted stock awards	374		342
Net income attributable to Alexandria’s common stockholders	$32,709		$22,442
Earnings per share attributable to Alexandria’s common stockholders – basic and diluted:	'		'
Continuing operations	$0.46		$0.35
Discontinued operations	$0		$0.01
Earnings per share – basic and diluted	$0.46		$0.36
[1]	(Loss) income from discontinued operations includes the results of operations of four properties that were classified as “held for sale” as of March 31, 2014, as well as the results of operations (prior to disposition) and loss on sale of real estate attributable to seven properties sold during the period from January 1, 2013, to March 31, 2014.

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (Unaudited) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Statement of Other Comprehensive Income [Abstract]	'	'
Net income	$40,749	$30,237
Unrealized gains on marketable securities:	'	'
Unrealized holding gains arising during the period	18,779	316
Reclassification adjustment for gains included in net income	0	-272
Unrealized gains on marketable securities, net	18,779	44
Unrealized gains on interest rate swap agreements:	'	'
Unrealized interest rate swap gains (losses) arising during the period	5,592	-133
Reclassification adjustment for amortization of interest expense included in net income	-3,490	4,308
Unrealized gains on interest rate swap agreements, net	2,102	4,175
Foreign currency translation losses	-3,106	-2,360
Total other comprehensive income (loss)	17,775	1,859
Comprehensive income	58,524	32,096
Less: comprehensive income attributable to noncontrolling interests	-1,195	-898
Comprehensive income attributable to Alexandria’s common stockholders	$57,329	$31,198

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	'	'	'	'
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	40,482	'	'	39,554	'	928	'	'	'	'	'
Total other comprehensive (loss) income	17,775	'	'	'	17,775	0	'	'	'	'	'
Contributions by noncontrolling interests	19,410	'	'	'	'	19,410	'	'	'	'	'
Distributions to noncontrolling interests	-690	'	'	'	'	-690	'	'	'	'	'
Issuances pursuant to stock plan (in shares)	'	73,984	'	'	'	'	'	'	'	'	'
Issuances pursuant to stock plan	5,243	0	5,243	'	'	'	'	'	'	'	'
Dividends declared on common stock	-50,154	'	'	-50,154	'	'	'	'	'	'	'
Dividends declared on preferred stock	-6,471	'	'	-6,471	'	'	'	-4,400	'	-2,100	'
Distributions in excess of earnings	'	'	-17,071	17,071	'	'	'	'	'	'	'
Increase (Decrease) in Temporary Equity [Roll Forward]	'	'	'	'	'	'	'	'	'	'	'
Net Income	'	'	'	'	'	'	267	'	'	'	'
Total other comprehensive income (loss)	'	'	'	'	'	'	0	'	'	'	'
Distributions to noncontrolling interests	'	'	'	'	'	'	-298	'	'	'	'
Ending balance at Mar. 31, 2014	'	'	'	'	'	'	14,413	'	'	'	'
Ending balance at Mar. 31, 2014	$3,990,092	$712	$3,560,453	$0	($18,429)	$67,356	'	'	$250,000	'	$130,000
Ending balance, common shares at Mar. 31, 2014	'	71,246,181	'	'	'	'	'	'	'	'	'

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (Unaudited) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Operating Activities	'	'
Net income	$40,749	$30,237
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation and amortization	50,421	46,995
Loss on sale of real estate	0	340
Amortization of loan fees and costs	2,561	2,386
Amortization of debt premiums/discounts	205	115
Amortization of acquired above and below market leases	-816	-830
Deferred rent	-11,882	-6,198
Stock compensation expense	3,228	3,349
Investment gains	-4,040	-446
Investment losses	1,694	386
Changes in operating assets and liabilities:	'	'
Restricted cash	0	1,506
Tenant receivables	-690	-818
Deferred leasing costs	-7,572	-11,757
Other assets	-17,315	-7,302
Accounts payable, accrued expenses, and tenant security deposits	16,716	-10,722
Net cash (used in) provided by operating activities	73,259	47,241
Investing Activities	'	'
Proceeds from sale of properties	0	80,203
Additions to properties	-111,587	-139,245
Purchase of properties	-42,338	0
Change in restricted cash related to construction projects	-140	-17
Contributions to unconsolidated real estate entity	-747	-2,074
Additions to investments	-11,905	-10,363
Proceeds from investments	3,998	1,972
Net cash (used in) provided by investing activities	-162,719	-69,524
Financing Activities	'	'
Borrowings from secured notes payable	51,030	17,215
Repayments of borrowings from secured notes payable	-210,844	-2,749
Principal borrowings from unsecured senior line of credit	360,000	179,000
Repayments of borrowings from unsecured senior line of credit	-58,000	-191,000
Change in restricted cash related to financings	1,059	8,656
Deferred financing costs paid	-8	-46
Dividends paid on common stock	-48,714	-35,687
Dividends paid on preferred stock	-6,471	-6,471
Contributions by noncontrolling interests	19,410	0
Distributions to noncontrolling interests	-988	-427
Net cash provided by (used in) financing activities	106,474	-31,509
Effect of foreign exchange rate changes on cash and cash equivalents	260	-178
Net increase (decrease) in cash and cash equivalents	17,274	-53,970
Cash and cash equivalents at beginning of period	57,696	140,971
Cash and cash equivalents at end of period	74,970	87,001
Supplemental Disclosure of Cash Flow Information	'	'
Cash paid during the period for interest, net of interest capitalized	6,093	9,964
Non-Cash Investing Activities	'	'
Note receivable from sale of real estate	0	38,820
Change in accrued capital expenditures	-6,028	-37,045
Assumption of secured notes payable in connection with purchase of properties	($48,329)	$0

Background

Background	3 Months Ended
	Mar. 31, 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,” “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 almost $9 billion as of March 31, 2014, and an asset base of 31.2 million square feet, including 17.7 million RSF of operating and current value-creation projects, as well as an additional 13.5 million square feet in future ground-up development projects, is the largest and leading real estate investment trust (“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, Seattle, San Diego, Maryland, and Research Triangle Park. Alexandria is known for its high-quality and diverse client tenant base. As the Landlord of Choice to the Life Science Industry®, approximately 52% of Alexandria’s total annualized base rent (“ABR”) results from investment-grade client tenants (an industry-leading percentage). 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 environment, 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 contains 185 properties approximating 17.7 million rentable square feet (“RSF”), consisting of the following, as of March 31, 2014:
			RSF
	Operating properties		15,670,993
	Development properties		1,823,713
	Redevelopment properties		221,225
	Total		17,715,931
	Ÿ	Investment-grade client tenants represented approximately 52% of our total ABR;
	Ÿ	Approximately 94% 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;
	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; and
	Ÿ	Approximately 92% of our leases (on an RSF basis) provided for the recapture of certain capital expenditures (such as heating, ventilation, and air conditioning (“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 consolidated financial statements in accordance with the standards of the Public Company Accounting Oversight Board.

Basis_of_presentation

Basis of presentation	3 Months Ended
	Mar. 31, 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 U.S. generally accepted accounting principles (“GAAP”) and in conformity with the rules and regulations of the Securities and Exchange Commission (“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.
	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.
	We hold interests, together with certain third parties, in companies that we consolidate in our financial statements. We consolidate the companies because we exercise significant control over major decisions by these entities, such as investment activity and changes in financing.
	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.
	Reclassifications
	Certain prior period amounts have been reclassified to conform to the current period presentation.
	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 tenant improvements, 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 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, construction in progress, 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 construction in progress, are assessed by project and include significant fluctuations in estimated net operating income (“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 as 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 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 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 stock of each individual entity to less than 10%.  As of March 31, 2014, and December 31, 2013, our ownership percentage in the voting stock of each individual entity was less than 10%.
	We monitor each of our equity 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 bad debt expense in future periods equal to the amount of uncollectible rent and deferred rent receivables arising from the straight-lining of rent.  As of March 31, 2014, and December 31, 2013, we had no allowance for estimated losses.
	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 client tenants and their respective businesses, and (iv) monitoring the timeliness of lease payments. 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 the credit quality of our client tenants and any material changes in credit quality.
	Interest income
	Interest income was $0.9 million and $1.3 million during the three months ended March 31, 2014 and 2013, respectively.  Interest 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 Accounting Standards Update (“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 that represents a strategic shift that has or will have a major effect on an entity’s operations and financial results or (ii) an acquired business or nonprofit 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. We expect the adoption of this ASU to result in fewer real estate sales qualifying for classification as discontinued operations in our consolidated results and related disclosures.

Investments_in_real_estate_net

Investments in real estate, net	3 Months Ended
	Mar. 31, 2014
Real Estate [Abstract]	'
Investments in real estate, net	'
	Investments in real estate, net
	Our investments in real estate, net, consisted of the following as of March 31, 2014, and December 31, 2013 (in thousands):
		31-Mar-14				31-Dec-13
	Rental properties:
	Land (related to rental properties)	$	567,232			$	553,388
	Buildings and building improvements	5,787,040				5,714,673
	Other improvements	191,276				174,147
	Rental properties	6,545,548				6,442,208
	Less: accumulated depreciation	(992,818		)		(952,106		)
	Rental properties, net	5,552,730				5,490,102
	Construction in progress (“CIP”)/current value-creation projects:
	Current development in North America	562,873				511,838
	Investment in unconsolidated joint venture	47,390			(1)	46,644			(1)
	Current redevelopment in North America	34,434				8,856
	Current development and redevelopment in Asia	59,540				60,928
		704,237				628,266
	Subtotal	6,256,967				6,118,368
	Land/value-creation projects:
	Land undergoing predevelopment activities (CIP) in North America	379,997				367,225
	Land held for development in North America	191,875				191,127
	Land held for development/undergoing predevelopment activities (CIP) in Asia	78,569				77,251
	Land subject to sale negotiations	22,854				22,943
		673,295				658,546
	Investments in real estate, net	$	6,930,262			$	6,776,914
	-1	Represents our investment under the equity method of accounting in the unconsolidated joint venture development project located at 360 Longwood Avenue.
	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 is currently 100% occupied. 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 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. The property is undergoing conversion into a 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 are currently 100% occupied. 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 in April 2016.
	Current development and redevelopment projects
	As of March 31, 2014, we had five ground-up development projects in process in North America, including an unconsolidated joint venture development project, aggregating 1.4 million RSF. We also had three projects undergoing conversion into laboratory/office space through redevelopment in North America aggregating 221,225 RSF.
	Investment in unconsolidated real estate entity
	We have a 27.5% equity interest in an unconsolidated joint venture that is currently developing a building aggregating 413,536 RSF in the Longwood Medical Area submarket of Greater Boston. We account for this investment under the equity method of accounting. Our investment under the equity method of accounting was $47.4 million as of March 31, 2014.
	We do not qualify as the primary beneficiary of the unconsolidated joint venture since we do not have the power to direct the activities of the entity that most significantly impacts its economic performance. The decisions that most significantly impact the entity’s economic performance require both our consent and that of our partners, including all major operating, investing, and financing decisions, as well as decisions involving major expenditures. Consequently, we do not consolidate this joint venture, and we account for our investment under the equity method of accounting.
	Land undergoing predevelopment activities (CIP)
	Land undergoing predevelopment activities is classified as construction in progress 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 March 31, 2014, we held land undergoing predevelopment activities in North America aggregating 2.7 million RSF. The largest project included in land undergoing predevelopment activities consists of substantially all of our 1.2 million square feet at the Alexandria Center™ at Kendall Square 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 1.2 million RSF primarily related to 50, 60, and 100 Binney Street of the Alexandria Center™ at Kendall Square 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 March 31, 2014, we held land in North America supporting an aggregate of 3.1 million RSF of ground-up development.

Investments

Investments	3 Months Ended
	Mar. 31, 2014
Investments [Abstract]	'
Investments	'
	Investments
	We hold investments in certain publicly traded companies and privately held entities involved primarily in life science and related industries.  Our investments in publicly traded companies are accounted for as “available for sale” securities that are carried at their fair values.  Investments in “available for sale” securities with gross unrealized losses as of March 31, 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 March 31, 2014. As of March 31, 2014, and December 31, 2013, there were no unrealized losses in our investments in privately held entities.
	The following table summarizes our investments as of March 31, 2014, and December 31, 2013 (in thousands):
		31-Mar-14				31-Dec-13
	“Available-for-sale” marketable equity securities, cost basis	$	12,608			$	2,879
	Unrealized gains	21,447			(1)	2,177
	Unrealized losses	(1,078		)		(587		)
	“Available-for-sale” marketable equity securities, at fair value	32,977				4,469
	Investments accounted for under cost method	136,345				135,819
	Total investments	$	169,322			$	140,288
	-1	Increase in our investments during the three months ended March 31, 2014, was primarily related to an increase in unrealized gains of approximately $18.8 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 three months ended March 31, 2014.
	The following table outlines our investment income, which is classified in other income in the accompanying consolidated statements of income (in thousands):
		Three Months Ended March 31,
		2014				2013
	Investment gains	$	4,040			$	446
	Investment losses	(1,694		)		(386		)
	Investment income	$	2,346			$	60

Secured_and_unsecured_senior_d

Secured and unsecured senior debt	3 Months Ended
	Mar. 31, 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 March 31, 2014 (dollars in thousands):
		Fixed Rate/Hedged				Unhedged				Total				Percentage of Total			Weighted Average			Weighted Average
		Variable Rate				Variable Rate				Consolidated							Interest Rate at			Remaining Term
																	End of Period (1)			(in years)
	Secured notes payable	$	424,287			$	173,224			$	597,511			18.4	%		4.98	%		3.4
	Unsecured senior notes payable	1,048,270				—				1,048,270				32.1			4.29			8.6
	$1.5 billion unsecured senior line of credit	—				506,000				506,000				15.6			1.25			4.8
	2016 Unsecured Senior Bank Term Loan	350,000				150,000				500,000				15.4			1.4			2.3
	2019 Unsecured Senior Bank Term Loan	600,000				—				600,000				18.5			2.05			4.8
	Total/weighted average	$	2,422,557			$	829,224			$	3,251,781			100	%		3.09	%		5.4
	Percentage of total debt	74		%		26		%		100		%
	-1	Represents the weighted average contractual 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 consolidated indebtedness and respective principal maturities as of
	March 31, 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
	San Diego		6.05	%		4.88	%		7/1/14	(3)	$	6,419			$	—			$	—		$	—		$	—		$	—		$	6,419
	San Diego		5.39			4			11/1/14		7,433				—				—			—			—			—			7,433
	Seattle		6			6			11/18/14		180				—				—			—			—			—			180
	Maryland		5.64			4.5			6/1/15		103				5,777				—			—			—			—			5,880
	San Francisco Bay Area		L+1.50			1.66			7/1/15	(4)	—				46,203				—			—			—			—			46,203
	Greater Boston, San Francisco Bay Area, and San Diego		5.73			5.73			1/1/16		1,279				1,816				75,501			—			—			—			78,596
	Greater Boston, San Diego, and Greater New York City		5.82			5.82			4/1/16		697				988				29,389			—			—			—			31,074
	San Diego		5.74			3			4/15/16		125				175				6,916			—			—			—			7,216
	San Francisco Bay Area		L+1.40			1.56			6/1/16	(5)	—				—				6,419			—			—			—			6,419
	San Francisco Bay Area		6.35			6.35			8/1/16		1,851				2,652				126,715			—			—			—			131,218
	Maryland		2.15			2.15			1/20/17		—				—				—			76,000			—			—			76,000
	Greater Boston		L+1.35			1.51			8/23/17	(6)	—				—				—			44,422			—			—			44,422
	San Diego, Maryland, and Seattle		7.75			7.75			4/1/20		1,100				1,570				1,696			1,832			1,979			106,491			114,668
	San Diego		4.66			4.66			1/1/23		891				1,396				1,458			1,534			1,608			33,501			40,388
	San Francisco Bay Area		6.5			6.5			6/1/37		17				18				19			20			22			751			847
	Unamortized premiums										270				218				60			—			—			—			548
	Secured notes payable average/subtotal		5.06	%		4.98					20,365				60,813				248,173			123,808			3,609			140,743			597,511
	2016 Unsecured Senior Bank Term Loan		L+1.20	%		1.4			7/31/16		—				—				500,000			—			—			—			500,000
	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	%	(7)	1.25			1/3/19		—				—				—			—			—			506,000			506,000
	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
	Unamortized discounts										(123		)		(170		)		(176		)	(184		)	(192		)	(885		)	(1,730		)
	Unsecured debt average/subtotal					2.66					(123		)		(170		)		499,824			(184		)	(192		)	2,155,115			2,654,270
	Average/total					3.09	%				$	20,242			$	60,643			$	747,997		$	123,624		$	3,417		$	2,295,858		$	3,251,781
	Balloon payments										$	13,722			$	51,919			$	743,364		$	120,422		$	—		$	2,286,611		$	3,216,038
	Principal amortization										6,520				8,724				4,633			3,202			3,417			9,247			35,743
	Total consolidated debt										$	20,242			$	60,643			$	747,997		$	123,624		$	3,417		$	2,295,858		$	3,251,781
	Fixed-rate/hedged variable-rate debt										$	20,062			$	14,440			$	591,578		$	3,202		$	3,417		$	1,789,858		$	2,422,557
	Unhedged variable-rate debt										180				46,203				156,419			120,422			—			506,000			829,224
	Total consolidated debt										$	20,242			$	60,643			$	747,997		$	123,624		$	3,417		$	2,295,858		$	3,251,781
	-1	Represents the weighted average contractual 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	Secured note payable was repaid on April 2, 2014.
	-4	Secured construction loan with aggregate commitments of $55.0 million. We have two, one-year options to extend the stated maturity date to July 1, 2017, subject to certain conditions.
	-5	Secured construction loan with aggregate commitments of $36.0 million. We have two, one-year options to extend the stated maturity date to June 1, 2018, subject to certain conditions.
	-6	Secured construction loan with aggregate commitments of $250.4 million. We have a one-year option to extend the stated maturity date to August 23, 2018, subject to certain conditions.
	-7	In addition to the stated rate, the unsecured senior line of credit is subject to an annual facility fee of 0.20%.
	Interest expense
	The following table summarizes interest expense for the three months ended March 31, 2014 and 2013 (in thousands):
		Three Months Ended March 31,
		2014				2013
	Gross interest	$	31,136			$	32,041
	Capitalized interest	(12,013		)		(14,021		)
	Interest expense	$	19,123			$	18,020
Repayment of secured note payable
In January 2014, we repaid our $208.7 million secured note payable related to Alexandria Technology Square®. Our joint venture partner funded $20.9 million of the proceeds required to repay the secured note payable.
Secured construction loans
The following table summarizes our secured construction loans as of March 31, 2014 (dollars in thousands):
Market		Stated Rate				Maturity Date				Outstanding Loan Balance				Available Balance				Total Aggregate Commitments
San Francisco Bay Area			L+1.50	%		7/1/15		(1)		$	46,203			$	8,797			$	55,000
San Francisco Bay Area			L+1.40	%		6/1/16		(2)		6,419				29,581				36,000
Greater Boston			L+1.35	%		8/23/17		(3)		44,422				205,978				250,400
										$	97,044			$	244,356			$	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.
Secured construction loan of unconsolidated joint venture
We have a 27.5% equity interest in an unconsolidated joint venture that is currently developing a building in the Longwood Medical Area of the Greater Boston market. The remaining construction costs will be funded primarily from a non-recourse secured construction loan to the joint venture with aggregate commitments of $213.2 million and an outstanding balance of $107.0 million as of March 31, 2014. See Note 3 – Investments in Real Estate, Net, to our consolidated financial statements (unaudited) appearing elsewhere in this quarterly report on Form 10-Q for further information.

Interest_rate_swap_agreements

Interest rate swap agreements	3 Months Ended
	Mar. 31, 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 three months ended March 31, 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 $3.6 million in accumulated other comprehensive loss to interest expense as an increase to interest expense. As of March 31, 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 March 31, 2014, the fair value of derivatives in a net liability position, which includes accrued interest but excludes any adjustment for nonperformance risk, related to these agreements was $2.4 million. The Company has agreements with certain of its derivative counterparties that contain a provision where (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 at March 31, 2014, it could have been required to settle its obligations under the agreements at their termination value of $2.4 million.
	We had the following outstanding interest rate swap agreements that were designated as cash flow hedges of interest rate risk as of March 31, 2014 (dollars in thousands):
	Effective Date		Maturity Date	Number of Contracts	Weighted Average Interest Pay	Fair Value as of 3/31/14			Notional Amount in Effect as of
					Rate (1)				3/31/14		12/31/14		12/31/15		12/31/16
	31-Dec-13		31-Dec-14	2	0.98%	$	(3,090	)	$	500,000	$	—	$	—	$	—
	31-Dec-13		31-Mar-15	2	0.23%	(126		)	250,000		250,000		—		—
	31-Mar-14		31-Mar-15	4	0.21%	(48		)	200,000		200,000		—		—
	31-Dec-14		31-Mar-16	3	0.53%	394			—		500,000		500,000		—
	31-Mar-16		31-Mar-17	3	1.40%	1,651			—		—		—		500,000
	Total					$	(1,219	)	$	950,000	$	950,000	$	500,000	$	500,000
	-1	In addition to the interest pay rate, borrowings outstanding as of March 31, 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	3 Months Ended
	Mar. 31, 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 months ended March 31, 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 March 31, 2014, and December 31, 2013 (in thousands):
						31-Mar-14
	Description		Total			Quoted Prices in			Significant			Significant
						Active Markets			Other			Unobservable
						for Identical			Observable			Inputs
						Assets			Inputs
	Assets:
	Available-for-sale securities		$	32,977		$	32,977		$	—		$	—
	Interest rate swap agreements		$	2,045		$	—		$	2,045		$	—
	Liabilities:
	Interest rate swap agreements		$	3,264		$	—		$	3,264		$	—
						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 March 31, 2014, and December 31, 2013, the book and fair values of our 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):
		31-Mar-14						31-Dec-13
		Book Value			Fair Value			Book Value			Fair Value
	Assets:
	Marketable equity securities	$	32,977		$	32,977		$	4,469		$	4,469
	Interest rate swap agreements	$	2,045		$	2,045		$	2,870		$	2,870
	Liabilities:
	Interest rate swap agreements	$	3,264		$	3,264		$	6,191		$	6,191
	Secured notes payable	$	597,511		$	617,084		$	708,831		$	736,772
	Unsecured senior notes payable	$	1,048,270		$	1,053,170		$	1,048,230		$	1,043,125
	Unsecured senior line of credit	$	506,000		$	500,860		$	204,000		$	193,714
	Unsecured senior bank term loans	$	1,100,000		$	1,099,448		$	1,100,000		$	1,099,897

Earnings_per_share

Earnings per share	3 Months Ended
	Mar. 31, 2014
Earnings Per Share [Abstract]	'
Earnings per share	'
	Earnings per share
	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 earnings per share.  Pursuant to the presentation and disclosure literature on gains or losses on sales or disposals by REITs and earnings per share 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 earnings per share for income from continuing operations.
	We account for unvested restricted stock awards that contain nonforfeitable rights to dividends as participating securities and include these securities in the computation of earnings per share 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 earnings per share 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 earnings per share is computed using the weighted average shares of common stock outstanding determined for the basic earnings per share 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 earnings per share computations for the three months ended March 31, 2014 and 2013 (in thousands, except per share amounts):
		Three Months Ended March 31,
		2014			2013
	Income from continuing operations	$	40,911		$	29,400
	Net income attributable to noncontrolling interests	(1,195		)	(982		)
	Dividends on preferred stock	(6,471		)	(6,471		)
	Net income attributable to unvested restricted stock awards	(374		)	(342		)
	Income from continuing operations attributable to Alexandria’s common stockholders – basic and diluted	32,871			21,605
	(Loss) income from discontinued operations	(162		)	837
	Net income attributable to Alexandria’s common stockholders – basic and diluted	$	32,709		$	22,442
	Weighted average shares of common stock outstanding – basic and diluted	71,073			63,161
	Earnings per share attributable to Alexandria’s common stockholders – basic and diluted:
	Continuing operations	$	0.46		$	0.35
	Discontinued operations	—			0.01
	Earnings per share – basic and diluted	$	0.46		$	0.36
	For purposes of calculating diluted earnings per share, we did not assume conversion of our Series D Preferred Stock for the three months ended March 31, 2014 and 2013, since the impact was antidilutive to earnings per share attributable to Alexandria’s common stockholders from continuing operations during those periods.

Net_income_attributable_to_Ale

Net income attributable to Alexandria Real Estate Equities, Inc.	3 Months Ended
	Mar. 31, 2014
Net Income (Loss) Attributable to Parent [Abstract]	'
Net income attributable to Alexandria Real Estate Equities, Inc.	'
	Net income attributable to Alexandria Real Estate Equities, Inc.
	The following table presents income from continuing and discontinued operations attributable to Alexandria Real Estate Equities, Inc. for the three months ended March 31, 2014 and 2013 (in thousands):
		Three Months Ended March 31,
		2014			2013
	Income from continuing operations	$	40,911		$	29,400
	Less: net income attributable to noncontrolling interests	(1,195		)	(982		)
	Income from continuing operations attributable to Alexandria Real Estate Equities, Inc.	39,716			28,418
	(Loss) income from discontinued operations	(162		)	837
	Less: net income from discontinued operations attributable to noncontrolling interests	—			—
	Net income attributable to Alexandria Real Estate Equities, Inc.	$	39,554		$	29,255

Stockholders_equity

Stockholders' equity	3 Months Ended
	Mar. 31, 2014
Stockholders' Equity Note [Abstract]	'
Stockholders' equity	'
	Stockholders’ equity
	Dividends
	In March 2014, we declared cash dividends on our common stock for the first quarter of 2014, aggregating $50.2 million, or $0.70 per share.  In March 2014, we also declared cash dividends on our Series D Preferred Stock for the first 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 first quarter of 2014, aggregating approximately $2.1 million, or $0.403125 per share.  In April 2014, we paid the cash dividends on our common stock, Series D Preferred Stock, and Series E Preferred Stock for the first 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			Unrealized Loss on Foreign Currency Translation			Total
				Swap Agreements
	Balance as of December 31, 2013	$	1,590	$	(3,321	)	$	(34,473	)	$	(36,204	)
	Other comprehensive income (loss) before reclassifications	18,779		5,592			(3,106		)	21,265
	Amounts reclassified from other comprehensive income	—		(3,490		)	—			(3,490		)
	Net other comprehensive income (loss)	18,779		2,102			(3,106		)	17,775
	Balance as of March 31, 2014	$	20,369	$	(1,219	)	$	(37,579	)	$	(18,429	)
	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 March 31, 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 March 31, 2014.

Noncontrolling_interests

Noncontrolling interests	3 Months Ended
	Mar. 31, 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 10 properties and three development parcels as of March 31, 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.
	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.  As of March 31, 2014, and December 31, 2013, our redeemable noncontrolling interest balances were $14.4 million and $14.4 million, respectively.  Our remaining noncontrolling interests, aggregating $67.4 million and $47.7 million as of March 31, 2014, and December 31, 2013, respectively, do not have rights to require us to purchase their ownership interests and are classified in total equity in the accompanying consolidated balance sheets.

Discontinued_operations

Discontinued operations	3 Months Ended
	Mar. 31, 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):
		March 31, 2014				December 31, 2013
	Properties “held for sale,” net	$	7,653			$	7,644
	Other assets	157				103
	Total assets	7,810				7,747
	Total liabilities	(132		)		(266		)
	Net assets of discontinued operations	$	7,678			$	7,481
			Three Months Ended March 31,
			2014				2013
	Total revenues		$	—			$	3,792
	Operating expenses		(162		)		(1,449		)
	Total revenues less operating expenses from discontinued operations		(162		)		2,343
	Depreciation expense		—				(1,166		)
	Loss on sale of real estate		—				(340		)
	(Loss) income from discontinued operations (1)		$	(162	)		$	837
	-1	(Loss) income from discontinued operations includes the results of operations of four properties that were classified as “held for sale” as of March 31, 2014, as well as the results of operations (prior to disposition) and loss on sale of real estate attributable to seven properties sold during the period from January 1, 2013, to March 31, 2014.

Subsequent_events

Subsequent events	3 Months Ended
	Mar. 31, 2014
Subsequent Events [Abstract]	'
Subsequent events	'
	Subsequent events
	Amended and extended employment agreement with Mr. Marcus
	In April 2014, the Board of Directors amended and extended the term of the employment agreement with Joel S. Marcus through December 31, 2016, subject to an extension to December 31, 2018, in the form of an option, exercisable by either the Company or Mr. Marcus, for Mr. Marcus to serve as full-time Executive Chairman. We believe changes in compensation arrangements appropriately address expressed concerns on the 2013 non-binding say-on-pay vote, and better align pay-for-performance, while at the same time continuing to retain Mr. Marcus’ highly valuable services.
	Acquisition of 500 Townsend Street
	In April 2014, we acquired a land parcel, supporting approximately 300,000 gross square feet, in the SoMa submarket of San Francisco for a purchase price of $50.0 million. We are in the process of perfecting entitlements, marketing for lease, and plan to commence construction as soon as possible in 2015.

Condensed_consolidating_financ

Condensed consolidating financial information	3 Months Ended
	Mar. 31, 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 March 31, 2014, and December 31, 2013, and the condensed consolidating statements of income, comprehensive income, and cash flows for the three months ended March 31, 2014 and 2013, for the Issuer, the Guarantor Subsidiary, the Combined Non-Guarantor Subsidiaries, 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 March 31, 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, net	$	—		$	—		$	6,930,262		$	—		$	6,930,262
	Cash and cash equivalents	36,379			—			38,591			—			74,970
	Restricted cash	54			—			30,400			—			30,454
	Tenant receivables	—			—			10,619			—			10,619
	Deferred rent	—			—			202,087			—			202,087
	Deferred leasing and financing costs, net	35,051			—			157,567			—			192,618
	Investments	—			10,868			158,454			—			169,322
	Investments in and advances to affiliates	6,601,258			6,090,900			124,891			(12,817,049		)	—
	Other assets	18,755			—			126,952			—			145,707
	Total assets	$	6,691,497		$	6,101,768		$	7,779,823		$	(12,817,049	)	$	7,756,039
	Liabilities, Noncontrolling Interests, and Equity
	Secured notes payable	$	—		$	—		$	597,511		$	—		$	597,511
	Unsecured senior notes payable	1,048,270			—			—			—			1,048,270
	Unsecured senior line of credit	506,000			—			—			—			506,000
	Unsecured senior bank term loans	1,100,000			—			—			—			1,100,000
	Accounts payable, accrued expenses, and tenant security deposits	58,921			—			384,972			—			443,893
	Dividends payable	55,570			—			290			—			55,860
	Total liabilities	2,768,761			—			982,773			—			3,751,534
	Redeemable noncontrolling interests	—			—			14,413			—			14,413
	Alexandria Real Estate Equities, Inc.’s stockholders’ equity	3,922,736			6,101,768			6,715,281			(12,817,049		)	3,922,736
	Noncontrolling interests	—			—			67,356			—			67,356
	Total equity	3,922,736			6,101,768			6,782,637			(12,817,049		)	3,990,092
	Total liabilities, noncontrolling interests, and equity	$	6,691,497		$	6,101,768		$	7,779,823		$	(12,817,049	)	$	7,756,039
	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, net	$	—		$	—		$	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, net	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 March 31, 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	$	—		$	—		$	130,570		$	—		$	130,570
Tenant recoveries	—			—			41,682			—			41,682
Other income	2,919			—			4,633			(3,618		)	3,934
Total revenues	2,919			—			176,885			(3,618		)	176,186
Expenses:
Rental operations	—			—			52,507			—			52,507
General and administrative	10,860			—			5,982			(3,618		)	13,224
Interest	13,539			—			5,584			—			19,123
Depreciation and amortization	1,471			—			48,950			—			50,421
Total expenses	25,870			—			113,023			(3,618		)	135,275
(Loss) income from continuing operations before equity in earnings of affiliates	(22,951		)	—			63,862			—			40,911
Equity in earnings of affiliates	62,505			58,306			1,148			(121,959		)	—
Income from continuing operations	39,554			58,306			65,010			(121,959		)	40,911
Loss from discontinued operations	—			—			(162		)	—			(162		)
Net income	39,554			58,306			64,848			(121,959		)	40,749
Net income attributable to noncontrolling interests	—			—			1,195			—			1,195
Dividends on preferred stock	6,471			—			—			—			6,471
Net income attributable to unvested restricted stock awards	374			—			—			—			374
Net income attributable to Alexandria Real Estate Equities, Inc.’s common stockholders	$	32,709		$	58,306		$	63,653		$	(121,959	)	$	32,709
Condensed Consolidating Statement of Income
for the Three Months Ended March 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)
Revenues:
Rental	$	—		$	—		$	111,526		$	—		$	111,526
Tenant recoveries	—			—			35,565			—			35,565
Other income	2,595			(66		)	3,571			(3,108		)	2,992
Total revenues	2,595			(66		)	150,662			(3,108		)	150,083
Expenses:
Rental operations	—			—			45,186			—			45,186
General and administrative	10,269			—			4,487			(3,108		)	11,648
Interest	11,720			—			6,300			—			18,020
Depreciation and amortization	1,475			—			44,354			—			45,829
Total expenses	23,464			—			100,327			(3,108		)	120,683
(Loss) income from continuing operations before equity in earnings of affiliates	(20,869		)	(66		)	50,335			—			29,400
Equity in earnings of affiliates	49,807			47,239			960			(98,006		)	—
Income from continuing operations	28,938			47,173			51,295			(98,006		)	29,400
Income from discontinued operations	317			—			520			—			837
Net income	29,255			47,173			51,815			(98,006		)	30,237
Net income attributable to noncontrolling interests	—			—			982			—			982
Dividends on preferred stock	6,471			—			—			—			6,471
Net income attributable to unvested restricted stock awards	342			—			—			—			342
Net income attributable to Alexandria Real Estate Equities, Inc.’s common stockholders	$	22,442		$	47,173		$	50,833		$	(98,006	)	$	22,442
Condensed Consolidating Statement of Comprehensive Income
for the Three Months Ended March 31, 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	$	39,554		$	58,306		$	64,848		$	(121,959	)	$	40,749
Other comprehensive income:
Unrealized gains on marketable securities:
Unrealized holding gains arising during the period	—			—			18,779			—			18,779
Reclassification adjustment for losses included in net income	—			—			—			—			—
Unrealized gains on marketable securities	—			—			18,779			—			18,779
Unrealized gains on interest rate swap agreements:
Unrealized interest rate swap gains arising during the period	5,592			—			—			—			5,592
Reclassification adjustment for amortization of interest expense included in net income	(3,490		)	—			—			—			(3,490		)
Unrealized gains on interest rate swap agreements	2,102			—			—			—			2,102
Foreign currency translation losses	—			—			(3,106		)	—			(3,106		)
Total other comprehensive income	2,102			—			15,673			—			17,775
Comprehensive income	41,656			58,306			80,521			(121,959		)	58,524
Less: comprehensive income attributable to noncontrolling interests	—			—			(1,195		)	—			(1,195		)
Comprehensive income attributable to Alexandria Real Estate Equities, Inc.’s common stockholders	$	41,656		$	58,306		$	79,326		$	(121,959	)	$	57,329
Condensed Consolidating Statement of Comprehensive Income
for the Three Months Ended March 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)
Net income	$	29,255		$	47,173		$	51,815		$	(98,006	)	$	30,237
Other comprehensive income:
Unrealized gains on marketable securities:
Unrealized holding (losses) gains arising during the period	—			(8		)	324			—			316
Reclassification adjustment for losses (gains) included in net income	—			38			(310		)	—			(272		)
Unrealized gains on marketable securities	—			30			14			—			44
Unrealized gains on interest rate swap agreements:
Unrealized interest rate swap losses arising during the period	(133		)	—			—			—			(133		)
Reclassification adjustment for amortization of interest expense included in net income	4,308			—			—			—			4,308
Unrealized gains on interest rate swap agreements	4,175			—			—			—			4,175
Foreign currency translation losses	—			—			(2,360		)	—			(2,360		)
Total other comprehensive income (loss)	4,175			30			(2,346		)	—			1,859
Comprehensive income	33,430			47,203			49,469			(98,006		)	32,096
Less: comprehensive income attributable to noncontrolling interests	—			—			(898		)	—			(898		)
Comprehensive income attributable to Alexandria Real Estate Equities, Inc.’s common stockholders	$	33,430		$	47,203		$	48,571		$	(98,006	)	$	31,198
Condensed Consolidating Statement of Cash Flows
for the Three Months Ended March 31, 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	$	39,554		$	58,306		$	64,848		$	(121,959	)	$	40,749
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	1,471			—			48,950			—			50,421
Amortization of loan fees and costs	1,770			—			791			—			2,561
Amortization of debt premiums/discounts	40			—			165			—			205
Amortization of acquired above and below market leases	—			—			(816		)	—			(816		)
Deferred rent	—			—			(11,882		)	—			(11,882		)
Stock compensation expense	3,228			—			—			—			3,228
Equity in (income) loss related to subsidiaries	(62,505		)	(58,306		)	(1,148		)	121,959			—
Investment gains	—			—			(4,040		)	—			(4,040		)
Investment losses	—			—			1,694			—			1,694
Changes in operating assets and liabilities:
Tenant receivables	—			—			(690		)	—			(690		)
Deferred leasing costs	—			—			(7,572		)	—			(7,572		)
Other assets	(748		)	—			(16,567		)	—			(17,315		)
Accounts payable, accrued expenses, and tenant security deposits	13,478			—			3,238			—			16,716
Net cash (used in) provided by operating activities	(3,712		)	—			76,971			—			73,259
Investing Activities
Additions to properties	—			—			(111,587		)	—			(111,587		)
Purchase of properties	—			—			(42,338		)	—			(42,338		)
Change in restricted cash related to construction projects	—			—			(140		)	—			(140		)
Contributions to unconsolidated real estate entity	—			—			(747		)	—			(747		)
Investments in subsidiaries	(221,513		)	(193,863		)	(6,338		)	421,714			—
Additions to investments	—			—			(11,905		)	—			(11,905		)
Proceeds from sales of investments	—			—			3,998			—			3,998
Net cash (used in) provided by investing activities	$	(221,513	)	$	(193,863	)	$	(169,057	)	$	421,714		$	(162,719	)
Condensed Consolidating Statement of Cash Flows (continued)
for the Three Months Ended March 31, 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	$	—		$	—		$	51,030		$	—		$	51,030
Repayments of borrowings from secured notes payable	—			—			(210,844		)	—			(210,844		)
Principal borrowings from unsecured senior line of credit	360,000			—			—			—			360,000
Repayments of borrowings from unsecured senior line of credit	(58,000		)	—			—			—			(58,000		)
Transfer to/from parent company	—			193,863			227,851			(421,714		)	—
Change in restricted cash related to financings	—			—			1,059			—			1,059
Deferred financing costs paid	—			—			(8		)	—			(8		)
Dividends paid on common stock	(48,715		)	—			1			—			(48,714		)
Dividends paid on preferred stock	(6,471		)	—			—			—			(6,471		)
Contributions by noncontrolling interests	—			—			19,410			—			19,410
Distributions to noncontrolling interests	—			—			(988		)	—			(988		)
Net cash provided by (used in) financing activities	246,814			193,863			87,511			(421,714		)	106,474
Effect of foreign exchange rate changes on cash and cash equivalents	—			—			260			—			260
Net increase (decrease) in cash and cash equivalents	21,589			—			(4,315		)	—			17,274
Cash and cash equivalents at beginning of period	14,790			—			42,906			—			57,696
Cash and cash equivalents at end of period	$	36,379		$	—		$	38,591		$	—		$	74,970
Supplemental Disclosure of Cash Flow Information
Cash paid during the period for interest, net of interest capitalized	$	347		$	—		$	5,746		$	—		$	6,093
Non-Cash Investing Activities
Change in accrued capital expenditures	$	—		$	—		$	(6,028	)	$	—		$	(6,028	)
Assumption of secured notes payable in connection with purchase of properties	$	—		$	—		$	(48,329	)	$	—		$	(48,329	)
Condensed Consolidating Statement of Cash Flows
for the Three Months Ended March 31, 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	$	29,255		$	47,173		$	51,815		$	(98,006	)	$	30,237
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	1,473			—			45,522			—			46,995
Loss on sale of real estate	—			—			340			—			340
Amortization of loan fees and costs	1,680			—			706			—			2,386
Amortization of debt premiums/discounts	11			—			104			—			115
Amortization of acquired above and below market leases	—			—			(830		)	—			(830		)
Deferred rent	—			—			(6,198		)	—			(6,198		)
Stock compensation expense	3,349			—			—			—			3,349
Equity in (income) loss related to subsidiaries	(49,807		)	(47,239		)	(960		)	98,006			—
Investment gains	—			(121		)	(325		)	—			(446		)
Investment losses	—			187			199			—			386
Changes in operating assets and liabilities:
Restricted cash	7			—			1,499			—			1,506
Tenant receivables	(51		)	—			(767		)	—			(818		)
Deferred leasing costs	(350		)	—			(11,407		)	—			(11,757		)
Other assets	29,445			—			(36,747		)	—			(7,302		)
Intercompany receivables and payables	(21		)	—			21			—			—
Accounts payable, accrued expenses, and tenant security deposits	(16,301		)	—			5,579			—			(10,722		)
Net cash (used in) provided by operating activities	(1,310		)	—			48,551			—			47,241
Investing Activities
Proceeds from sale of properties	10,796			—			69,407			—			80,203
Additions to properties	—			—			(139,245		)	—			(139,245		)
Change in restricted cash related to construction projects	—			—			(17		)	—			(17		)
Contributions to unconsolidated real estate entity	—			—			(2,074		)	—			(2,074		)
Investments in subsidiaries	(14,842		)	(30,986		)	—			45,828			—
Additions to investments	—			(3		)	(10,360		)	—			(10,363		)
Proceeds from sales of investments	—			252			1,720			—			1,972
Net cash (used in) provided by investing activities	$	(4,046	)	$	(30,737	)	$	(80,569	)	$	45,828		$	(69,524	)
Condensed Consolidating Statement of Cash Flows (continued)
for the Three Months Ended March 31, 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	$	—		$	—		$	17,215		$	—		$	17,215
Repayments of borrowings from secured notes payable	—			—			(2,749		)	—			(2,749		)
Principal borrowings from unsecured senior line of credit	179,000			—			—			—			179,000
Repayments of borrowings from unsecured senior line of credit	(191,000		)	—			—			—			(191,000		)
Transfer to/from parent company	—			28,823			17,005			(45,828		)	—
Change in restricted cash related to financings	—			—			8,656			—			8,656
Deferred financing costs paid	(41		)	—			(5		)	—			(46		)
Dividends paid on common stock	(35,687		)	—			—			—			(35,687		)
Dividends paid on preferred stock	(6,471		)	—			—			—			(6,471		)
Distributions to noncontrolling interests	—			—			(427		)	—			(427		)
Net cash (used in) provided by financing activities	(54,199		)	28,823			39,695			(45,828		)	(31,509		)
Effect of foreign exchange rate changes on cash and cash equivalents	—			—			(178		)	—			(178		)
Net (decrease) increase in cash and cash equivalents	(59,555		)	(1,914		)	7,499			—			(53,970		)
Cash and cash equivalents at beginning of period	98,567			1,914			40,490			—			140,971
Cash and cash equivalents at end of period	$	39,012		$	—		$	47,989		$	—		$	87,001
Supplemental Disclosure of Cash Flow Information
Cash paid during the period for interest, net of interest capitalized	$	3,735		$	—		$	6,229		$	—		$	9,964
Non-Cash Investing Activities
Note receivable from sale of real estate	$	29,820		$	—		$	9,000		$	—		$	38,820
Change in accrued capital expenditures	$	—		$	—		$	(37,045	)	$	—		$	(37,045	)

Basis_of_presentation_Policies

Basis of presentation (Policies)	3 Months Ended
	Mar. 31, 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 U.S. generally accepted accounting principles (“GAAP”) and in conformity with the rules and regulations of the Securities and Exchange Commission (“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.
	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.
	We hold interests, together with certain third parties, in companies that we consolidate in our financial statements. We consolidate the companies because we exercise significant control over major decisions by these entities, such as investment activity and changes in financing.
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.
Reclassifications	'
	Reclassifications
	Certain prior period amounts have been reclassified to conform to the current period presentation.
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 tenant improvements, 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 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, construction in progress, 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 construction in progress, are assessed by project and include significant fluctuations in estimated net operating income (“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 as 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 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 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 stock of each individual entity to less than 10%.  As of March 31, 2014, and December 31, 2013, our ownership percentage in the voting stock of each individual entity was less than 10%.
	We monitor each of our equity 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 bad debt expense in future periods equal to the amount of uncollectible rent and deferred rent receivables arising from the straight-lining of rent.
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 client tenants and their respective businesses, and (iv) monitoring the timeliness of lease payments. 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 the credit quality of our client tenants and any material changes in credit quality.
Interest income	'
	Interest income
	Interest income was $0.9 million and $1.3 million during the three months ended March 31, 2014 and 2013, respectively.  Interest 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 Accounting Standards Update (“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 that represents a strategic shift that has or will have a major effect on an entity’s operations and financial results or (ii) an acquired business or nonprofit 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. We expect the adoption of this ASU to result in fewer real estate sales qualifying for classification as discontinued operations in our consolidated results and related disclosures.

Background_Tables

Background (Tables)	3 Months Ended
	Mar. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Schedule of rentable square feet by property	'
	Our asset base contains 185 properties approximating 17.7 million rentable square feet (“RSF”), consisting of the following, as of March 31, 2014:
		RSF
	Operating properties	15,670,993
	Development properties	1,823,713
	Redevelopment properties	221,225
	Total	17,715,931

Investments_in_real_estate_net1

Investments in real estate, net (Tables)	3 Months Ended
	Mar. 31, 2014
Real Estate [Abstract]	'
Investments in real estate	'
	Our investments in real estate, net, consisted of the following as of March 31, 2014, and December 31, 2013 (in thousands):
		31-Mar-14				31-Dec-13
	Rental properties:
	Land (related to rental properties)	$	567,232			$	553,388
	Buildings and building improvements	5,787,040				5,714,673
	Other improvements	191,276				174,147
	Rental properties	6,545,548				6,442,208
	Less: accumulated depreciation	(992,818		)		(952,106		)
	Rental properties, net	5,552,730				5,490,102
	Construction in progress (“CIP”)/current value-creation projects:
	Current development in North America	562,873				511,838
	Investment in unconsolidated joint venture	47,390			(1)	46,644			(1)
	Current redevelopment in North America	34,434				8,856
	Current development and redevelopment in Asia	59,540				60,928
		704,237				628,266
	Subtotal	6,256,967				6,118,368
	Land/value-creation projects:
	Land undergoing predevelopment activities (CIP) in North America	379,997				367,225
	Land held for development in North America	191,875				191,127
	Land held for development/undergoing predevelopment activities (CIP) in Asia	78,569				77,251
	Land subject to sale negotiations	22,854				22,943
		673,295				658,546
	Investments in real estate, net	$	6,930,262			$	6,776,914
	-1	Represents our investment under the equity method of accounting in the unconsolidated joint venture development project located at 360 Longwood Avenue.

Investments_Tables

Investments (Tables)	3 Months Ended
	Mar. 31, 2014
Investments [Abstract]	'
Summary of investments	'
	The following table summarizes our investments as of March 31, 2014, and December 31, 2013 (in thousands):
		31-Mar-14				31-Dec-13
	“Available-for-sale” marketable equity securities, cost basis	$	12,608			$	2,879
	Unrealized gains	21,447			(1)	2,177
	Unrealized losses	(1,078		)		(587		)
	“Available-for-sale” marketable equity securities, at fair value	32,977				4,469
	Investments accounted for under cost method	136,345				135,819
	Total investments	$	169,322			$	140,288
	-1	Increase in our investments during the three months ended March 31, 2014, was primarily related to an increase in unrealized gains of approximately $18.8 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 three months ended March 31, 2014.
Schedule of net investment income	'
	The following table outlines our investment income, which is classified in other income in the accompanying consolidated statements of income (in thousands):
		Three Months Ended March 31,
		2014				2013
	Investment gains	$	4,040			$	446
	Investment losses	(1,694		)		(386		)
	Investment income	$	2,346			$	60

Secured_and_unsecured_senior_d1

Secured and unsecured senior debt (Tables)	3 Months Ended
	Mar. 31, 2014
Debt Disclosure [Abstract]	'
Summary of secured and unsecured debt	'
	The following table summarizes our secured and unsecured senior debt as of March 31, 2014 (dollars in thousands):
		Fixed Rate/Hedged				Unhedged				Total				Percentage of Total			Weighted Average			Weighted Average
		Variable Rate				Variable Rate				Consolidated							Interest Rate at			Remaining Term
																	End of Period (1)			(in years)
	Secured notes payable	$	424,287			$	173,224			$	597,511			18.4	%		4.98	%		3.4
	Unsecured senior notes payable	1,048,270				—				1,048,270				32.1			4.29			8.6
	$1.5 billion unsecured senior line of credit	—				506,000				506,000				15.6			1.25			4.8
	2016 Unsecured Senior Bank Term Loan	350,000				150,000				500,000				15.4			1.4			2.3
	2019 Unsecured Senior Bank Term Loan	600,000				—				600,000				18.5			2.05			4.8
	Total/weighted average	$	2,422,557			$	829,224			$	3,251,781			100	%		3.09	%		5.4
	Percentage of total debt	74		%		26		%		100		%
	-1	Represents the weighted average contractual 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.
Summary of fixed rate/hedged and unhedged floating rate debt and their respective principal maturities	'
	The following table summarizes our outstanding consolidated indebtedness and respective principal maturities as of
	March 31, 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
	San Diego		6.05	%		4.88	%		7/1/14	(3)	$	6,419			$	—			$	—		$	—		$	—		$	—		$	6,419
	San Diego		5.39			4			11/1/14		7,433				—				—			—			—			—			7,433
	Seattle		6			6			11/18/14		180				—				—			—			—			—			180
	Maryland		5.64			4.5			6/1/15		103				5,777				—			—			—			—			5,880
	San Francisco Bay Area		L+1.50			1.66			7/1/15	(4)	—				46,203				—			—			—			—			46,203
	Greater Boston, San Francisco Bay Area, and San Diego		5.73			5.73			1/1/16		1,279				1,816				75,501			—			—			—			78,596
	Greater Boston, San Diego, and Greater New York City		5.82			5.82			4/1/16		697				988				29,389			—			—			—			31,074
	San Diego		5.74			3			4/15/16		125				175				6,916			—			—			—			7,216
	San Francisco Bay Area		L+1.40			1.56			6/1/16	(5)	—				—				6,419			—			—			—			6,419
	San Francisco Bay Area		6.35			6.35			8/1/16		1,851				2,652				126,715			—			—			—			131,218
	Maryland		2.15			2.15			1/20/17		—				—				—			76,000			—			—			76,000
	Greater Boston		L+1.35			1.51			8/23/17	(6)	—				—				—			44,422			—			—			44,422
	San Diego, Maryland, and Seattle		7.75			7.75			4/1/20		1,100				1,570				1,696			1,832			1,979			106,491			114,668
	San Diego		4.66			4.66			1/1/23		891				1,396				1,458			1,534			1,608			33,501			40,388
	San Francisco Bay Area		6.5			6.5			6/1/37		17				18				19			20			22			751			847
	Unamortized premiums										270				218				60			—			—			—			548
	Secured notes payable average/subtotal		5.06	%		4.98					20,365				60,813				248,173			123,808			3,609			140,743			597,511
	2016 Unsecured Senior Bank Term Loan		L+1.20	%		1.4			7/31/16		—				—				500,000			—			—			—			500,000
	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	%	(7)	1.25			1/3/19		—				—				—			—			—			506,000			506,000
	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
	Unamortized discounts										(123		)		(170		)		(176		)	(184		)	(192		)	(885		)	(1,730		)
	Unsecured debt average/subtotal					2.66					(123		)		(170		)		499,824			(184		)	(192		)	2,155,115			2,654,270
	Average/total					3.09	%				$	20,242			$	60,643			$	747,997		$	123,624		$	3,417		$	2,295,858		$	3,251,781
	Balloon payments										$	13,722			$	51,919			$	743,364		$	120,422		$	—		$	2,286,611		$	3,216,038
	Principal amortization										6,520				8,724				4,633			3,202			3,417			9,247			35,743
	Total consolidated debt										$	20,242			$	60,643			$	747,997		$	123,624		$	3,417		$	2,295,858		$	3,251,781
	Fixed-rate/hedged variable-rate debt										$	20,062			$	14,440			$	591,578		$	3,202		$	3,417		$	1,789,858		$	2,422,557
	Unhedged variable-rate debt										180				46,203				156,419			120,422			—			506,000			829,224
	Total consolidated debt										$	20,242			$	60,643			$	747,997		$	123,624		$	3,417		$	2,295,858		$	3,251,781
	-1	Represents the weighted average contractual 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	Secured note payable was repaid on April 2, 2014.
	-4	Secured construction loan with aggregate commitments of $55.0 million. We have two, one-year options to extend the stated maturity date to July 1, 2017, subject to certain conditions.
	-5	Secured construction loan with aggregate commitments of $36.0 million. We have two, one-year options to extend the stated maturity date to June 1, 2018, subject to certain conditions.
	-6	Secured construction loan with aggregate commitments of $250.4 million. We have a one-year option to extend the stated maturity date to August 23, 2018, subject to certain conditions.
	-7	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 incurred	'
	The following table summarizes interest expense for the three months ended March 31, 2014 and 2013 (in thousands):
		Three Months Ended March 31,
		2014				2013
	Gross interest	$	31,136			$	32,041
	Capitalized interest	(12,013		)		(14,021		)
	Interest expense	$	19,123			$	18,020
Schedule of secured construction loans	'
	The following table summarizes our secured construction loans as of March 31, 2014 (dollars in thousands):
	Market		Stated Rate				Maturity Date				Outstanding Loan Balance				Available Balance				Total Aggregate Commitments
	San Francisco Bay Area			L+1.50	%		7/1/15		(1)		$	46,203			$	8,797			$	55,000
	San Francisco Bay Area			L+1.40	%		6/1/16		(2)		6,419				29,581				36,000
	Greater Boston			L+1.35	%		8/23/17		(3)		44,422				205,978				250,400
											$	97,044			$	244,356			$	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)	3 Months Ended
	Mar. 31, 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 March 31, 2014 (dollars in thousands):
	Effective Date		Maturity Date	Number of Contracts	Weighted Average Interest Pay	Fair Value as of 3/31/14			Notional Amount in Effect as of
					Rate (1)				3/31/14		12/31/14		12/31/15		12/31/16
	31-Dec-13		31-Dec-14	2	0.98%	$	(3,090	)	$	500,000	$	—	$	—	$	—
	31-Dec-13		31-Mar-15	2	0.23%	(126		)	250,000		250,000		—		—
	31-Mar-14		31-Mar-15	4	0.21%	(48		)	200,000		200,000		—		—
	31-Dec-14		31-Mar-16	3	0.53%	394			—		500,000		500,000		—
	31-Mar-16		31-Mar-17	3	1.40%	1,651			—		—		—		500,000
	Total					$	(1,219	)	$	950,000	$	950,000	$	500,000	$	500,000
	-1	In addition to the interest pay rate, borrowings outstanding as of March 31, 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)	3 Months Ended
	Mar. 31, 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 March 31, 2014, and December 31, 2013 (in thousands):
						31-Mar-14
	Description		Total			Quoted Prices in			Significant			Significant
						Active Markets			Other			Unobservable
						for Identical			Observable			Inputs
						Assets			Inputs
	Assets:
	Available-for-sale securities		$	32,977		$	32,977		$	—		$	—
	Interest rate swap agreements		$	2,045		$	—		$	2,045		$	—
	Liabilities:
	Interest rate swap agreements		$	3,264		$	—		$	3,264		$	—
						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 March 31, 2014, and December 31, 2013, the book and fair values of our 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):
		31-Mar-14						31-Dec-13
		Book Value			Fair Value			Book Value			Fair Value
	Assets:
	Marketable equity securities	$	32,977		$	32,977		$	4,469		$	4,469
	Interest rate swap agreements	$	2,045		$	2,045		$	2,870		$	2,870
	Liabilities:
	Interest rate swap agreements	$	3,264		$	3,264		$	6,191		$	6,191
	Secured notes payable	$	597,511		$	617,084		$	708,831		$	736,772
	Unsecured senior notes payable	$	1,048,270		$	1,053,170		$	1,048,230		$	1,043,125
	Unsecured senior line of credit	$	506,000		$	500,860		$	204,000		$	193,714
	Unsecured senior bank term loans	$	1,100,000		$	1,099,448		$	1,100,000		$	1,099,897

Earnings_per_share_Tables

Earnings per share (Tables)	3 Months Ended
	Mar. 31, 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 earnings per share computations for the three months ended March 31, 2014 and 2013 (in thousands, except per share amounts):
		Three Months Ended March 31,
		2014			2013
	Income from continuing operations	$	40,911		$	29,400
	Net income attributable to noncontrolling interests	(1,195		)	(982		)
	Dividends on preferred stock	(6,471		)	(6,471		)
	Net income attributable to unvested restricted stock awards	(374		)	(342		)
	Income from continuing operations attributable to Alexandria’s common stockholders – basic and diluted	32,871			21,605
	(Loss) income from discontinued operations	(162		)	837
	Net income attributable to Alexandria’s common stockholders – basic and diluted	$	32,709		$	22,442
	Weighted average shares of common stock outstanding – basic and diluted	71,073			63,161
	Earnings per share attributable to Alexandria’s common stockholders – basic and diluted:
	Continuing operations	$	0.46		$	0.35
	Discontinued operations	—			0.01
	Earnings per share – basic and diluted	$	0.46		$	0.36

Net_income_attributable_to_Ale1

Net income attributable to Alexandria Real Estate Equities, Inc. (Tables)	3 Months Ended
	Mar. 31, 2014
Net Income (Loss) Attributable to Parent [Abstract]	'
Net income (loss) attributable to Alexandria Real Estate Equities, Inc.	'
	The following table presents income from continuing and discontinued operations attributable to Alexandria Real Estate Equities, Inc. for the three months ended March 31, 2014 and 2013 (in thousands):
		Three Months Ended March 31,
		2014			2013
	Income from continuing operations	$	40,911		$	29,400
	Less: net income attributable to noncontrolling interests	(1,195		)	(982		)
	Income from continuing operations attributable to Alexandria Real Estate Equities, Inc.	39,716			28,418
	(Loss) income from discontinued operations	(162		)	837
	Less: net income from discontinued operations attributable to noncontrolling interests	—			—
	Net income attributable to Alexandria Real Estate Equities, Inc.	$	39,554		$	29,255

Stockholders_equity_Tables

Stockholders' equity (Tables)	3 Months Ended
	Mar. 31, 2014
Stockholders' Equity Note [Abstract]	'
Accumulated other comprehensive loss attributable to Alexandria Real Estate Equities, Inc.	'
	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			Unrealized Loss on Foreign Currency Translation			Total
				Swap Agreements
	Balance as of December 31, 2013	$	1,590	$	(3,321	)	$	(34,473	)	$	(36,204	)
	Other comprehensive income (loss) before reclassifications	18,779		5,592			(3,106		)	21,265
	Amounts reclassified from other comprehensive income	—		(3,490		)	—			(3,490		)
	Net other comprehensive income (loss)	18,779		2,102			(3,106		)	17,775
	Balance as of March 31, 2014	$	20,369	$	(1,219	)	$	(37,579	)	$	(18,429	)

Discontinued_operations_Tables

Discontinued operations (Tables)	3 Months Ended
	Mar. 31, 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):
		March 31, 2014				December 31, 2013
	Properties “held for sale,” net	$	7,653			$	7,644
	Other assets	157				103
	Total assets	7,810				7,747
	Total liabilities	(132		)		(266		)
	Net assets of discontinued operations	$	7,678			$	7,481
			Three Months Ended March 31,
			2014				2013
	Total revenues		$	—			$	3,792
	Operating expenses		(162		)		(1,449		)
	Total revenues less operating expenses from discontinued operations		(162		)		2,343
	Depreciation expense		—				(1,166		)
	Loss on sale of real estate		—				(340		)
	(Loss) income from discontinued operations (1)		$	(162	)		$	837
	-1	(Loss) income from discontinued operations includes the results of operations of four properties that were classified as “held for sale” as of March 31, 2014, as well as the results of operations (prior to disposition) and loss on sale of real estate attributable to seven properties sold during the period from January 1, 2013, to March 31, 2014.

Condensed_consolidating_financ1

Condensed consolidating financial information (Tables)	3 Months Ended
	Mar. 31, 2014
Condensed Consolidated Financial Information [Abstract]	'
Condensed consolidating balance sheet	'
	Consolidating Balance Sheet
	as of March 31, 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, net	$	—		$	—		$	6,930,262		$	—		$	6,930,262
	Cash and cash equivalents	36,379			—			38,591			—			74,970
	Restricted cash	54			—			30,400			—			30,454
	Tenant receivables	—			—			10,619			—			10,619
	Deferred rent	—			—			202,087			—			202,087
	Deferred leasing and financing costs, net	35,051			—			157,567			—			192,618
	Investments	—			10,868			158,454			—			169,322
	Investments in and advances to affiliates	6,601,258			6,090,900			124,891			(12,817,049		)	—
	Other assets	18,755			—			126,952			—			145,707
	Total assets	$	6,691,497		$	6,101,768		$	7,779,823		$	(12,817,049	)	$	7,756,039
	Liabilities, Noncontrolling Interests, and Equity
	Secured notes payable	$	—		$	—		$	597,511		$	—		$	597,511
	Unsecured senior notes payable	1,048,270			—			—			—			1,048,270
	Unsecured senior line of credit	506,000			—			—			—			506,000
	Unsecured senior bank term loans	1,100,000			—			—			—			1,100,000
	Accounts payable, accrued expenses, and tenant security deposits	58,921			—			384,972			—			443,893
	Dividends payable	55,570			—			290			—			55,860
	Total liabilities	2,768,761			—			982,773			—			3,751,534
	Redeemable noncontrolling interests	—			—			14,413			—			14,413
	Alexandria Real Estate Equities, Inc.’s stockholders’ equity	3,922,736			6,101,768			6,715,281			(12,817,049		)	3,922,736
	Noncontrolling interests	—			—			67,356			—			67,356
	Total equity	3,922,736			6,101,768			6,782,637			(12,817,049		)	3,990,092
	Total liabilities, noncontrolling interests, and equity	$	6,691,497		$	6,101,768		$	7,779,823		$	(12,817,049	)	$	7,756,039
	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, net	$	—		$	—		$	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, net	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 March 31, 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	$	—		$	—		$	130,570		$	—		$	130,570
	Tenant recoveries	—			—			41,682			—			41,682
	Other income	2,919			—			4,633			(3,618		)	3,934
	Total revenues	2,919			—			176,885			(3,618		)	176,186
	Expenses:
	Rental operations	—			—			52,507			—			52,507
	General and administrative	10,860			—			5,982			(3,618		)	13,224
	Interest	13,539			—			5,584			—			19,123
	Depreciation and amortization	1,471			—			48,950			—			50,421
	Total expenses	25,870			—			113,023			(3,618		)	135,275
	(Loss) income from continuing operations before equity in earnings of affiliates	(22,951		)	—			63,862			—			40,911
	Equity in earnings of affiliates	62,505			58,306			1,148			(121,959		)	—
	Income from continuing operations	39,554			58,306			65,010			(121,959		)	40,911
	Loss from discontinued operations	—			—			(162		)	—			(162		)
	Net income	39,554			58,306			64,848			(121,959		)	40,749
	Net income attributable to noncontrolling interests	—			—			1,195			—			1,195
	Dividends on preferred stock	6,471			—			—			—			6,471
	Net income attributable to unvested restricted stock awards	374			—			—			—			374
	Net income attributable to Alexandria Real Estate Equities, Inc.’s common stockholders	$	32,709		$	58,306		$	63,653		$	(121,959	)	$	32,709
	Condensed Consolidating Statement of Income
	for the Three Months Ended March 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)
	Revenues:
	Rental	$	—		$	—		$	111,526		$	—		$	111,526
	Tenant recoveries	—			—			35,565			—			35,565
	Other income	2,595			(66		)	3,571			(3,108		)	2,992
	Total revenues	2,595			(66		)	150,662			(3,108		)	150,083
	Expenses:
	Rental operations	—			—			45,186			—			45,186
	General and administrative	10,269			—			4,487			(3,108		)	11,648
	Interest	11,720			—			6,300			—			18,020
	Depreciation and amortization	1,475			—			44,354			—			45,829
	Total expenses	23,464			—			100,327			(3,108		)	120,683
	(Loss) income from continuing operations before equity in earnings of affiliates	(20,869		)	(66		)	50,335			—			29,400
	Equity in earnings of affiliates	49,807			47,239			960			(98,006		)	—
	Income from continuing operations	28,938			47,173			51,295			(98,006		)	29,400
	Income from discontinued operations	317			—			520			—			837
	Net income	29,255			47,173			51,815			(98,006		)	30,237
	Net income attributable to noncontrolling interests	—			—			982			—			982
	Dividends on preferred stock	6,471			—			—			—			6,471
	Net income attributable to unvested restricted stock awards	342			—			—			—			342
	Net income attributable to Alexandria Real Estate Equities, Inc.’s common stockholders	$	22,442		$	47,173		$	50,833		$	(98,006	)	$	22,442
Condensed consolidating statement comprehensive income	'
	Condensed Consolidating Statement of Comprehensive Income
	for the Three Months Ended March 31, 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	$	39,554		$	58,306		$	64,848		$	(121,959	)	$	40,749
	Other comprehensive income:
	Unrealized gains on marketable securities:
	Unrealized holding gains arising during the period	—			—			18,779			—			18,779
	Reclassification adjustment for losses included in net income	—			—			—			—			—
	Unrealized gains on marketable securities	—			—			18,779			—			18,779
	Unrealized gains on interest rate swap agreements:
	Unrealized interest rate swap gains arising during the period	5,592			—			—			—			5,592
	Reclassification adjustment for amortization of interest expense included in net income	(3,490		)	—			—			—			(3,490		)
	Unrealized gains on interest rate swap agreements	2,102			—			—			—			2,102
	Foreign currency translation losses	—			—			(3,106		)	—			(3,106		)
	Total other comprehensive income	2,102			—			15,673			—			17,775
	Comprehensive income	41,656			58,306			80,521			(121,959		)	58,524
	Less: comprehensive income attributable to noncontrolling interests	—			—			(1,195		)	—			(1,195		)
	Comprehensive income attributable to Alexandria Real Estate Equities, Inc.’s common stockholders	$	41,656		$	58,306		$	79,326		$	(121,959	)	$	57,329
	Condensed Consolidating Statement of Comprehensive Income
	for the Three Months Ended March 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)
	Net income	$	29,255		$	47,173		$	51,815		$	(98,006	)	$	30,237
	Other comprehensive income:
	Unrealized gains on marketable securities:
	Unrealized holding (losses) gains arising during the period	—			(8		)	324			—			316
	Reclassification adjustment for losses (gains) included in net income	—			38			(310		)	—			(272		)
	Unrealized gains on marketable securities	—			30			14			—			44
	Unrealized gains on interest rate swap agreements:
	Unrealized interest rate swap losses arising during the period	(133		)	—			—			—			(133		)
	Reclassification adjustment for amortization of interest expense included in net income	4,308			—			—			—			4,308
	Unrealized gains on interest rate swap agreements	4,175			—			—			—			4,175
	Foreign currency translation losses	—			—			(2,360		)	—			(2,360		)
	Total other comprehensive income (loss)	4,175			30			(2,346		)	—			1,859
	Comprehensive income	33,430			47,203			49,469			(98,006		)	32,096
	Less: comprehensive income attributable to noncontrolling interests	—			—			(898		)	—			(898		)
	Comprehensive income attributable to Alexandria Real Estate Equities, Inc.’s common stockholders	$	33,430		$	47,203		$	48,571		$	(98,006	)	$	31,198
Condensed consolidating statement cash flows	'
	Condensed Consolidating Statement of Cash Flows
	for the Three Months Ended March 31, 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	$	39,554		$	58,306		$	64,848		$	(121,959	)	$	40,749
	Adjustments to reconcile net income to net cash provided by operating activities:
	Depreciation and amortization	1,471			—			48,950			—			50,421
	Amortization of loan fees and costs	1,770			—			791			—			2,561
	Amortization of debt premiums/discounts	40			—			165			—			205
	Amortization of acquired above and below market leases	—			—			(816		)	—			(816		)
	Deferred rent	—			—			(11,882		)	—			(11,882		)
	Stock compensation expense	3,228			—			—			—			3,228
	Equity in (income) loss related to subsidiaries	(62,505		)	(58,306		)	(1,148		)	121,959			—
	Investment gains	—			—			(4,040		)	—			(4,040		)
	Investment losses	—			—			1,694			—			1,694
	Changes in operating assets and liabilities:
	Tenant receivables	—			—			(690		)	—			(690		)
	Deferred leasing costs	—			—			(7,572		)	—			(7,572		)
	Other assets	(748		)	—			(16,567		)	—			(17,315		)
	Accounts payable, accrued expenses, and tenant security deposits	13,478			—			3,238			—			16,716
	Net cash (used in) provided by operating activities	(3,712		)	—			76,971			—			73,259
	Investing Activities
	Additions to properties	—			—			(111,587		)	—			(111,587		)
	Purchase of properties	—			—			(42,338		)	—			(42,338		)
	Change in restricted cash related to construction projects	—			—			(140		)	—			(140		)
	Contributions to unconsolidated real estate entity	—			—			(747		)	—			(747		)
	Investments in subsidiaries	(221,513		)	(193,863		)	(6,338		)	421,714			—
	Additions to investments	—			—			(11,905		)	—			(11,905		)
	Proceeds from sales of investments	—			—			3,998			—			3,998
	Net cash (used in) provided by investing activities	$	(221,513	)	$	(193,863	)	$	(169,057	)	$	421,714		$	(162,719	)
	Condensed Consolidating Statement of Cash Flows (continued)
	for the Three Months Ended March 31, 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	$	—		$	—		$	51,030		$	—		$	51,030
	Repayments of borrowings from secured notes payable	—			—			(210,844		)	—			(210,844		)
	Principal borrowings from unsecured senior line of credit	360,000			—			—			—			360,000
	Repayments of borrowings from unsecured senior line of credit	(58,000		)	—			—			—			(58,000		)
	Transfer to/from parent company	—			193,863			227,851			(421,714		)	—
	Change in restricted cash related to financings	—			—			1,059			—			1,059
	Deferred financing costs paid	—			—			(8		)	—			(8		)
	Dividends paid on common stock	(48,715		)	—			1			—			(48,714		)
	Dividends paid on preferred stock	(6,471		)	—			—			—			(6,471		)
	Contributions by noncontrolling interests	—			—			19,410			—			19,410
	Distributions to noncontrolling interests	—			—			(988		)	—			(988		)
	Net cash provided by (used in) financing activities	246,814			193,863			87,511			(421,714		)	106,474
	Effect of foreign exchange rate changes on cash and cash equivalents	—			—			260			—			260
	Net increase (decrease) in cash and cash equivalents	21,589			—			(4,315		)	—			17,274
	Cash and cash equivalents at beginning of period	14,790			—			42,906			—			57,696
	Cash and cash equivalents at end of period	$	36,379		$	—		$	38,591		$	—		$	74,970
	Supplemental Disclosure of Cash Flow Information
	Cash paid during the period for interest, net of interest capitalized	$	347		$	—		$	5,746		$	—		$	6,093
	Non-Cash Investing Activities
Change in accrued capital expenditures	$	—		$	—		$	(6,028	)	$	—		$	(6,028	)
Assumption of secured notes payable in connection with purchase of properties	$	—		$	—		$	(48,329	)	$	—		$	(48,329	)
Condensed Consolidating Statement of Cash Flows
for the Three Months Ended March 31, 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	$	29,255		$	47,173		$	51,815		$	(98,006	)	$	30,237
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	1,473			—			45,522			—			46,995
Loss on sale of real estate	—			—			340			—			340
Amortization of loan fees and costs	1,680			—			706			—			2,386
Amortization of debt premiums/discounts	11			—			104			—			115
Amortization of acquired above and below market leases	—			—			(830		)	—			(830		)
Deferred rent	—			—			(6,198		)	—			(6,198		)
Stock compensation expense	3,349			—			—			—			3,349
Equity in (income) loss related to subsidiaries	(49,807		)	(47,239		)	(960		)	98,006			—
Investment gains	—			(121		)	(325		)	—			(446		)
Investment losses	—			187			199			—			386
Changes in operating assets and liabilities:
Restricted cash	7			—			1,499			—			1,506
Tenant receivables	(51		)	—			(767		)	—			(818		)
Deferred leasing costs	(350		)	—			(11,407		)	—			(11,757		)
Other assets	29,445			—			(36,747		)	—			(7,302		)
Intercompany receivables and payables	(21		)	—			21			—			—
Accounts payable, accrued expenses, and tenant security deposits	(16,301		)	—			5,579			—			(10,722		)
Net cash (used in) provided by operating activities	(1,310		)	—			48,551			—			47,241
Investing Activities
Proceeds from sale of properties	10,796			—			69,407			—			80,203
Additions to properties	—			—			(139,245		)	—			(139,245		)
Change in restricted cash related to construction projects	—			—			(17		)	—			(17		)
Contributions to unconsolidated real estate entity	—			—			(2,074		)	—			(2,074		)
Investments in subsidiaries	(14,842		)	(30,986		)	—			45,828			—
Additions to investments	—			(3		)	(10,360		)	—			(10,363		)
Proceeds from sales of investments	—			252			1,720			—			1,972
Net cash (used in) provided by investing activities	$	(4,046	)	$	(30,737	)	$	(80,569	)	$	45,828		$	(69,524	)
Condensed Consolidating Statement of Cash Flows (continued)
for the Three Months Ended March 31, 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	$	—		$	—		$	17,215		$	—		$	17,215
Repayments of borrowings from secured notes payable	—			—			(2,749		)	—			(2,749		)
Principal borrowings from unsecured senior line of credit	179,000			—			—			—			179,000
Repayments of borrowings from unsecured senior line of credit	(191,000		)	—			—			—			(191,000		)
Transfer to/from parent company	—			28,823			17,005			(45,828		)	—
Change in restricted cash related to financings	—			—			8,656			—			8,656
Deferred financing costs paid	(41		)	—			(5		)	—			(46		)
Dividends paid on common stock	(35,687		)	—			—			—			(35,687		)
Dividends paid on preferred stock	(6,471		)	—			—			—			(6,471		)
Distributions to noncontrolling interests	—			—			(427		)	—			(427		)
Net cash (used in) provided by financing activities	(54,199		)	28,823			39,695			(45,828		)	(31,509		)
Effect of foreign exchange rate changes on cash and cash equivalents	—			—			(178		)	—			(178		)
Net (decrease) increase in cash and cash equivalents	(59,555		)	(1,914		)	7,499			—			(53,970		)
Cash and cash equivalents at beginning of period	98,567			1,914			40,490			—			140,971
Cash and cash equivalents at end of period	$	39,012		$	—		$	47,989		$	—		$	87,001
Supplemental Disclosure of Cash Flow Information
Cash paid during the period for interest, net of interest capitalized	$	3,735		$	—		$	6,229		$	—		$	9,964
Non-Cash Investing Activities
Note receivable from sale of real estate	$	29,820		$	—		$	9,000		$	—		$	38,820
Change in accrued capital expenditures	$	—		$	—		$	(37,045	)	$	—		$	(37,045	)

Background_Details

Background (Details) (USD $)	3 Months Ended
In Billions, unless otherwise specified	Mar. 31, 2014
	property
	sqft
Nature of Business [Line Items]	'
Total Market Capitalization	$9
Total Rentable Square Footage of Asset Base	31,239,652
Total rentable area (in square feet)	17,715,931
Square Footage of Real Estate Property, Future Development	13,523,721
Number of properties	185
Investment-grade client tenants as a percentage of total annualized base rent	52.00%
Percentage of leases which are triple net leases	94.00%
Percentage of leases containing effective annual rent escalations	95.00%
Percentage of leases providing for recapture of certain capital expenditures	92.00%
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)	Mar. 31, 2014
	sqft
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Operating properties	15,670,993
Development properties	1,823,713
Redevelopment properties	221,225
Total	17,715,931

Basis_of_presentation_Details

Basis of presentation (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Basis of presentation	'	'	'
Maximum expected period of sale of property (in years)	'1 year	'	'
Cost method investment ownership percentage	10.00%	'	10.00%
The Company generally distributes this percentage or more of its taxable income	100.00%	'	'
Minimum percentage of taxable income to be distributed	100.00%	'	'
Provision for federal income taxes	$0	'	'
Allowance for estimated losses	0	'	0
Interest income included in other income	$900,000	$1,300,000	'
Maximum	'	'	'
Basis of presentation	'	'	'
Percentage of ownership interest criteria	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 $)	Mar. 31, 2014		Dec. 31, 2013
In Thousands, unless otherwise specified
Real Estate Properties [Line Items]	'		'
Land (related to rental properties)	$567,232		$553,388
Buildings and building improvements	5,787,040		5,714,673
Other improvements	191,276		174,147
Rental properties	6,545,548		6,442,208
Less: accumulated depreciation	-992,818		-952,106
Rental properties, net	5,552,730		5,490,102
Construction in progress ("CIP")/current value-added projects:	'		'
Investments in real estate, net	6,930,262		6,776,914
Construction in progress ("CIP")/current value-added projects:	'		'
Construction in progress ("CIP")/current value-added projects:	'		'
Development in process	704,237		628,266
Active development in North America | North America	'		'
Construction in progress ("CIP")/current value-added projects:	'		'
Development in process	562,873		511,838
Investment in unconsolidated joint venture | North America	'		'
Construction in progress ("CIP")/current value-added projects:	'		'
Development in process	47,390	[1]	46,644	[1]
Active redevelopment in North America | North America	'		'
Construction in progress ("CIP")/current value-added projects:	'		'
Development in process	34,434		8,856
Active development and redevelopment in Asia | Asia	'		'
Construction in progress ("CIP")/current value-added projects:	'		'
Development in process	59,540		60,928
Land/future value-added projects:	'		'
Land/future value-added projects:	'		'
Land available for development	673,295		658,546
Land undergoing predevelopment activities (CIP) in North America (2) | North America	'		'
Land/future value-added projects:	'		'
Land available for development	379,997		367,225
Land held for future development in North America | North America	'		'
Land/future value-added projects:	'		'
Land available for development	191,875		191,127
Land held for future development/undergoing predevelopment activities (CIP) in Asia | Asia	'		'
Land/future value-added projects:	'		'
Land available for development	78,569		77,251
Land subject to sale negotiations	'		'
Land/future value-added projects:	'		'
Land available for development	22,854		22,943
Rental properties, net and Construction in progress ("CIP")/current value-added projects	'		'
Construction in progress ("CIP")/current value-added projects:	'		'
Investments in real estate, net	$6,256,967		$6,118,368
[1]	Represents our investment under the equity method of accounting in the unconsolidated joint venture development project located at 360 Longwood Avenue.

Investments_in_real_estate_net3

Investments in real estate, net Acquisitions (Details) (USD $)	3 Months Ended		0 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 27, 2014	Jan. 30, 2014	Mar. 17, 2014	Mar. 31, 2014	Mar. 31, 2014
			Greater Boston, Massachusetts	San Diego, California	San Diego, California	Secured Debt Maturing on January 2023	Secured Debt Maturing On 15 April 2016
			225 Second Avenue	3545 Cray Court	4025/4031/4045 Sorrento Valley Boulevard	San Diego, California
			sqft	sqft	property	3545 Cray Court
					sqft
Business Acquisition [Line Items]	'	'	'	'	'	'	'
Area of real estate property	'	'	112,500	116,556	42,566	'	'
Payments to acquire real estate property	'	'	$16,300,000	$64,000,000	$12,400,000	'	'
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%

Investments_in_real_estate_net4

Investments in real estate, net Development and redevelopment projects (Details)	Mar. 31, 2014
	sqft
	property
Development	'
Real Estate Properties [Line Items]	'
Number of real estate properties	5
Area of real estate property	1,358,257
Redevelopment	'
Real Estate Properties [Line Items]	'
Number of real estate properties	3
Area of real estate property	221,225

Investments_in_real_estate_net5

Investments in real estate, net Investment in unconsolidated entity (Details) (Greater Boston market, Equity Method Investee, USD $)	Mar. 31, 2014
In Millions, unless otherwise specified	sqft
Greater Boston market | Equity Method Investee	'
Schedule of Equity Method Investments [Line Items]	'
Equity interest percentage (in percent)	27.50%
Area of real estate property	413,536
Equity method investments amount	$47.40

Investments_in_real_estate_net6

Investments in real estate, net Land undergoing predevelopment and future development (Details)	Mar. 31, 2014
	Transaction
Real Estate Properties [Line Items]	'
Number of construction or preconstruction activities	0
North America	'
Real Estate Properties [Line Items]	'
Square feet undergoing preconstruction activities (in square feet)	2,700,000
Square feet of developable property (in square feet)	3,100,000
Alexandria Centerâ„¢ at Kendall Square	'
Real Estate Properties [Line Items]	'
Square feet undergoing preconstruction activities (in square feet)	1,200,000
Preconstruction Prior to Vertical Construction | 50 and 100 Binney Street	'
Real Estate Properties [Line Items]	'
Area of real estate property	1,200,000

Investments_Summary_of_Investm

Investments Summary of Investments (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Investments [Abstract]	'		'
“Available-for-sale” marketable equity securities, cost basis	$12,608		$2,879
Unrealized gains	21,447	[1]	2,177
Unrealized losses	-1,078		-587
“Available-for-sale” marketable equity securities, at fair value	32,977		4,469
Investments accounted for under cost method	136,345		135,819
Total investments	169,322		140,288
Available-for-sale Securities, Unrealized Gains	$18,800	[1]	'
[1]	Increase in our investments during the three months ended March 31, 2014, was primarily related to an increase in unrealized gains of approximately $18.8 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 three months ended March 31, 2014.

Investments_Investment_Income_

Investments Investment Income (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Investments [Abstract]	'	'
Gain on Sale of Investments	$4,040	$446
Investment losses	-1,694	-386
Investment income	$2,346	$60

Secured_and_unsecured_senior_d2

Secured and unsecured senior debt Narratives (Details) (USD $)	3 Months Ended			0 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Jan. 31, 2014	Mar. 31, 2014	Mar. 31, 2014
			Greater Boston market	Alexandria Technology Square	Construction Loans	Construction Loans
			Equity Method Investee	Secured Debt from Insurance Company Maturing on 1 April 2014		Greater Boston market
						Equity Method Investee
Debt Instrument [Line Items]	'	'	'	'	'	'
Outstanding Loan Balance	'	'	'	$208,700,000	$97,044,000	'
Contributions by noncontrolling interests	19,410,000	0	'	20,900,000	'	'
Equity interest percentage (in percent)	'	'	27.50%	'	'	'
Total Aggregate Commitments	'	'	'	'	'	213,200,000
Drawn and outstanding construction loan	'	'	'	'	'	$107,000,000

Secured_and_unsecured_senior_d3

Secured and unsecured senior debt Schedule of secured and unsecured senior debts (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014
Debt Instrument [Line Items]	'
Fixed Rate/Hedged Variable Rate	$2,422,557
Unhedged Variable rate	829,224
Total Consolidated	3,251,781
Percentage of Total	100.00%
Total consolidated debt, Effective Interest	3.09%	[1]
Weighted Average Interest Rate at End of Period	2.66%	[1]
Weighted Average Remaining Terms (in years)	'5 years 4 months 18 days
Percentage of fixed rate/hedged total debt	74.00%
Percentage of unhedged floating rate total debt	26.00%
Secured notes payable	'
Debt Instrument [Line Items]	'
Fixed Rate/Hedged Variable Rate	424,287
Unhedged Variable rate	173,224
Total Consolidated	597,511
Percentage of Total	18.40%
Weighted Average Interest Rate at End of Period	4.98%	[1]
Weighted Average Remaining Terms (in years)	'3 years 4 months 12 days
Senior Notes	'
Debt Instrument [Line Items]	'
Fixed Rate/Hedged Variable Rate	1,048,270
Unhedged Variable rate	0
Total Consolidated	1,048,270
Percentage of Total	32.10%
Weighted Average Interest Rate at End of Period	4.29%	[1]
Weighted Average Remaining Terms (in years)	'8 years 7 months 6 days
$1.5 billion unsecured senior line of credit	'
Debt Instrument [Line Items]	'
Fixed Rate/Hedged Variable Rate	0
Unhedged Variable rate	506,000
Total Consolidated	506,000
Percentage of Total	15.60%
Weighted Average Interest Rate at End of Period	1.25%	[1]
Weighted Average Remaining Terms (in years)	'4 years 9 months
2016 Unsecured Senior Bank Term Loan	'
Debt Instrument [Line Items]	'
Fixed Rate/Hedged Variable Rate	350,000
Unhedged Variable rate	150,000
Total Consolidated	500,000
Percentage of Total	15.40%
Weighted Average Interest Rate at End of Period	1.40%	[1]
Weighted Average Remaining Terms (in years)	'2 years 3 months 6 days
2019 Unsecured Senior Bank Term Loan	'
Debt Instrument [Line Items]	'
Fixed Rate/Hedged Variable Rate	600,000
Unhedged Variable rate	0
Total Consolidated	$600,000
Percentage of Total	18.50%
Weighted Average Interest Rate at End of Period	2.05%	[1]
Weighted Average Remaining Terms (in years)	'4 years 9 months
[1]	Represents the weighted average contractual 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 Outstanding consolidated indebtedness (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014
Summary of fixed rate/hedged and floating rate debt	'
Fixed Rate/Hedged Variable Rate	$2,422,557
Unhedged Variable rate	829,224
Principal amount	3,251,781
Effective rate (as a percent)	2.66%	[1]
Future principal payments due on secured and unsecured debt	'
Total consolidated debt, Effective Interest	3.09%	[1]
Balloon payments	3,216,038
Principal amortization	35,743
2014	'
Summary of fixed rate/hedged and floating rate debt	'
Fixed Rate/Hedged Variable Rate	20,062
Unhedged Variable rate	180
Principal amount	20,242
Future principal payments due on secured and unsecured debt	'
Balloon payments	13,722
Principal amortization	6,520
2015	'
Summary of fixed rate/hedged and floating rate debt	'
Fixed Rate/Hedged Variable Rate	14,440
Unhedged Variable rate	46,203
Principal amount	60,643
Future principal payments due on secured and unsecured debt	'
Balloon payments	51,919
Principal amortization	8,724
2016	'
Summary of fixed rate/hedged and floating rate debt	'
Fixed Rate/Hedged Variable Rate	591,578
Unhedged Variable rate	156,419
Principal amount	747,997
Future principal payments due on secured and unsecured debt	'
Balloon payments	743,364
Principal amortization	4,633
2017	'
Summary of fixed rate/hedged and floating rate debt	'
Fixed Rate/Hedged Variable Rate	3,202
Unhedged Variable rate	120,422
Principal amount	123,624
Future principal payments due on secured and unsecured debt	'
Balloon payments	120,422
Principal amortization	3,202
2018	'
Summary of fixed rate/hedged and floating rate debt	'
Fixed Rate/Hedged Variable Rate	3,417
Unhedged Variable rate	0
Principal amount	3,417
Future principal payments due on secured and unsecured debt	'
Balloon payments	0
Principal amortization	3,417
Thereafter	'
Summary of fixed rate/hedged and floating rate debt	'
Fixed Rate/Hedged Variable Rate	1,789,858
Unhedged Variable rate	506,000
Principal amount	2,295,858
Future principal payments due on secured and unsecured debt	'
Balloon payments	2,286,611
Principal amortization	9,247
Secured notes payable	'
Summary of fixed rate/hedged and floating rate debt	'
Fixed Rate/Hedged Variable Rate	424,287
Unhedged Variable rate	173,224
Principal amount	597,511
Stated interest rate (as a percent)	5.06%
Effective rate (as a percent)	4.98%	[1]
Future principal payments due on secured and unsecured debt	'
2014	20,365
2015	60,813
2016	248,173
2017	123,808
2018	3,609
Thereafter	140,743
Secured notes payable from bank maturing on 7/1/14	'
Summary of fixed rate/hedged and floating rate debt	'
Stated interest rate (as a percent)	6.05%
Effective rate (as a percent)	4.88%	[1]
Maturity Date	1-Jul-14	[2],[3]
Future principal payments due on secured and unsecured debt	'
2014	6,419
2015	0
2016	0
2017	0
2018	0
Thereafter	0
Outstanding Loan Balance	6,419
Secured notes payable from bank maturing on 11/1/14	'
Summary of fixed rate/hedged and floating rate debt	'
Stated interest rate (as a percent)	5.39%
Effective rate (as a percent)	4.00%	[1]
Maturity Date	1-Nov-14	[2]
Future principal payments due on secured and unsecured debt	'
2014	7,433
2015	0
2016	0
2017	0
2018	0
Thereafter	0
Outstanding Loan Balance	7,433
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	180
2015	0
2016	0
2017	0
2018	0
Thereafter	0
Outstanding Loan Balance	180
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	103
2015	5,777
2016	0
2017	0
2018	0
Thereafter	0
Outstanding Loan Balance	5,880
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],[4]
Number of extensions available under line of credit	2
Future principal payments due on secured and unsecured debt	'
2014	0
2015	46,203
2016	0
2017	0
2018	0
Thereafter	0
Outstanding Loan Balance	46,203
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	1,279
2015	1,816
2016	75,501
2017	0
2018	0
Thereafter	0
Outstanding Loan Balance	78,596
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	697
2015	988
2016	29,389
2017	0
2018	0
Thereafter	0
Outstanding Loan Balance	31,074
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	125
2015	175
2016	6,916
2017	0
2018	0
Thereafter	0
Outstanding Loan Balance	7,216
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],[5]
Number of extensions available under line of credit	2
Future principal payments due on secured and unsecured debt	'
2014	0
2015	0
2016	6,419
2017	0
2018	0
Thereafter	0
Outstanding Loan Balance	6,419
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	1,851
2015	2,652
2016	126,715
2017	0
2018	0
Thereafter	0
Outstanding Loan Balance	131,218
Secured Debt from Bank Maturing on 20 January 2017	'
Summary of fixed rate/hedged and floating rate debt	'
Stated interest rate (as a percent)	2.15%
Effective rate (as a percent)	2.15%	[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
2018	0
Thereafter	0
Outstanding Loan Balance	76,000
Secured notes payable maturing on 8/23/17	'
Summary of fixed rate/hedged and floating rate debt	'
Effective rate (as a percent)	1.51%	[1]
Maturity Date	23-Aug-17	[2],[6]
Future principal payments due on secured and unsecured debt	'
2014	0
2015	0
2016	0
2017	44,422
2018	0
Thereafter	0
Outstanding Loan Balance	44,422
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	1,100
2015	1,570
2016	1,696
2017	1,832
2018	1,979
Thereafter	106,491
Outstanding Loan Balance	114,668
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	891
2015	1,396
2016	1,458
2017	1,534
2018	1,608
Thereafter	33,501
Outstanding Loan Balance	40,388
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	17
2015	18
2016	19
2017	20
2018	22
Thereafter	751
Outstanding Loan Balance	847
Unamortized Premiums	'
Future principal payments due on secured and unsecured debt	'
Unamortized premium	548
Unamortized Premiums | 2014	'
Future principal payments due on secured and unsecured debt	'
Unamortized premium	270
Unamortized Premiums | 2015	'
Future principal payments due on secured and unsecured debt	'
Unamortized premium	218
Unamortized Premiums | 2016	'
Future principal payments due on secured and unsecured debt	'
Unamortized premium	60
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	2,654,270
Unsecured Debt | 2014	'
Future principal payments due on secured and unsecured debt	'
2014	-123
Unsecured Debt | 2015	'
Future principal payments due on secured and unsecured debt	'
2015	-170
Unsecured Debt | 2016	'
Future principal payments due on secured and unsecured debt	'
2016	499,824
Unsecured Debt | 2017	'
Future principal payments due on secured and unsecured debt	'
2017	-184
Unsecured Debt | 2018	'
Future principal payments due on secured and unsecured debt	'
2018	-192
Unsecured Debt | Thereafter	'
Future principal payments due on secured and unsecured debt	'
Thereafter	2,155,115
2016 Unsecured Senior Bank Term Loan	'
Summary of fixed rate/hedged and floating rate debt	'
Fixed Rate/Hedged Variable Rate	350,000
Unhedged Variable rate	150,000
Principal amount	500,000
Effective rate (as a percent)	1.40%	[1]
Maturity Date	31-Jul-16	[2]
Future principal payments due on secured and unsecured debt	'
2014	0
2015	0
2016	500,000
2017	0
2018	0
Thereafter	0
Outstanding Loan Balance	500,000
2019 Unsecured Senior Bank Term Loan	'
Summary of fixed rate/hedged and floating rate debt	'
Fixed Rate/Hedged Variable Rate	600,000
Unhedged Variable rate	0
Principal amount	600,000
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
Outstanding Loan Balance	600,000
$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	506,000
Principal amount	506,000
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	506,000
Outstanding Loan Balance	506,000
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
Outstanding Loan Balance	550,000
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
Outstanding Loan Balance	500,000
Unamortized Discounts	'
Future principal payments due on secured and unsecured debt	'
Unamortized discount	-1,730
Unamortized Discounts | 2014	'
Future principal payments due on secured and unsecured debt	'
Unamortized discount	-123
Unamortized Discounts | 2015	'
Future principal payments due on secured and unsecured debt	'
Unamortized discount	-170
Unamortized Discounts | 2016	'
Future principal payments due on secured and unsecured debt	'
Unamortized discount	-176
Unamortized Discounts | 2017	'
Future principal payments due on secured and unsecured debt	'
Unamortized discount	-184
Unamortized Discounts | 2018	'
Future principal payments due on secured and unsecured debt	'
Unamortized discount	-192
Unamortized Discounts | Thereafter	'
Future principal payments due on secured and unsecured debt	'
Unamortized discount	($885)
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%	[7]
[1]	Represents the weighted average contractual 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]	Secured note payable was repaid on April 2, 2014.
[4]	Secured construction loan with aggregate commitments of $55.0 million. We have two, one-year options to extend the stated maturity date to July 1, 2017, subject to certain conditions.
[5]	Secured construction loan with aggregate commitments of $36.0 million. We have two, one-year options to extend the stated maturity date to June 1, 2018, subject to certain conditions.
[6]	Secured construction loan with aggregate commitments of $250.4 million. We have a one-year option to extend the stated maturity date to August 23, 2018, subject to certain conditions.
[7]	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 Interest expense (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Interest expense incurred	'	'
Gross interest	$31,136	$32,041
Capitalized interest	-12,013	-14,021
Interest expense	$19,123	$18,020

Secured_and_unsecured_senior_d6

Secured and unsecured senior debt Secured construction loans (Details) (Construction Loans, USD $)	3 Months Ended
	Mar. 31, 2014
Debt Instrument [Line Items]	'
Outstanding Loan Balance	$97,044,000
Available Balance	244,356,000
Total Aggregate Commitments	341,400,000
Secured notes payable maturing on 7/1/15	'
Debt Instrument [Line Items]	'
Total Aggregate Commitments	55,000,000
Secured notes payable maturing on 06/1/16	'
Debt Instrument [Line Items]	'
Total Aggregate Commitments	36,000,000
Secured notes payable maturing on 8/23/17	'
Debt Instrument [Line Items]	'
Total Aggregate Commitments	250,400,000
San Francisco Bay Area | Secured notes payable maturing on 7/1/15	'
Debt Instrument [Line Items]	'
Maturity Date	1-Jul-15	[1]
Outstanding Loan Balance	46,203,000
Available Balance	8,797,000
Total Aggregate Commitments	55,000,000
San Francisco Bay Area | Secured notes payable maturing on 06/1/16	'
Debt Instrument [Line Items]	'
Maturity Date	1-Jun-16	[2]
Outstanding Loan Balance	6,419,000
Available Balance	29,581,000
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 Loan Balance	44,422,000
Available Balance	205,978,000
Total Aggregate Commitments	$250,400,000
LIBOR | San Francisco Bay Area | Secured notes payable maturing on 7/1/15	'
Debt Instrument [Line Items]	'
Base rate	'LIBOR
Applicable margin (as a percent)	1.50%
LIBOR | San Francisco Bay Area | 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 $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 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	3,600,000	'
Collateral obligation requirements	0	'
Interest Rate Derivatives, at Fair Value, Net	$2,400,000	'

Interest_rate_swap_agreements_2

Interest rate swap agreements Outstanding interest rate swap (Details) (USD $)	Mar. 31, 2014
In Thousands, unless otherwise specified
Interest rate hedge agreements	'
Fair Values	($1,219)
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 Senior Line of Credit and Bank Term Loans | Minimum	'
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	-3,090
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	-126
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	-48
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	394
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	1,651
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 March 31, 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 $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Assets:	'	'
Available-for-sale securities	$32,977	$4,469
Fair value measured on recurring basis | Fair Value	'	'
Assets:	'	'
Available-for-sale securities	32,977	4,469
Interest rate swap agreements	2,045	2,870
Liabilities:	'	'
Interest rate swap agreements	3,264	6,191
Fair value measured on recurring basis | Quoted Prices in Active Markets for Identical Assets	'	'
Assets:	'	'
Available-for-sale securities	32,977	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	2,045	2,870
Liabilities:	'	'
Interest rate swap agreements	3,264	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 $)	Mar. 31, 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	$32,977	$4,469
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	32,977	4,469
Interest rate swap agreements	2,045	2,870
Interest rate swap agreements	3,264	6,191
Secured notes payable	597,511	708,831
Unsecured senior notes payable	1,048,270	1,048,230
Unsecured senior line of credit	506,000	204,000
Unsecured senior bank term loans	1,100,000	1,100,000
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	32,977	4,469
Interest rate swap agreements	2,045	2,870
Interest rate swap agreements	3,264	6,191
Secured notes payable	617,084	736,772
Unsecured senior notes payable	1,053,170	1,043,125
Unsecured senior line of credit	500,860	193,714
Unsecured senior bank term loans	$1,099,448	$1,099,897

Earnings_per_share_Details

Earnings per share (Details) (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2014		Mar. 31, 2013
Earnings per share	'		'
Income from continuing operations	$40,911		$29,400
Net income attributable to noncontrolling interests	-1,195		-982
Dividends on preferred stock	-6,471		-6,471
Net income attributable to unvested restricted stock awards	-374		-342
Income from continuing operations attributable to Alexandria Real Estate Equities, Inc.'s common stockholders - basic and diluted	32,871		21,605
(Loss) income from discontinued operations, net	-162	[1]	837	[1]
Net income attributable to Alexandria’s common stockholders	$32,709		$22,442
Weighted average shares of common stock outstanding – basic and diluted	71,073		63,161
Earnings per share attributable to Alexandria Real Estate Equities, Inc.'s common stockholders - basic and diluted:	'		'
Continuing operations	$0.46		$0.35
Discontinued operations	$0		$0.01
Earnings per share – basic and diluted	$0.46		$0.36
[1]	(Loss) income from discontinued operations includes the results of operations of four properties that were classified as “held for sale” as of March 31, 2014, as well as the results of operations (prior to disposition) and loss on sale of real estate attributable to seven properties sold during the period from January 1, 2013, to March 31, 2014.

Net_income_attributable_to_Ale2

Net income attributable to Alexandria Real Estate Equities, Inc. (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014		Mar. 31, 2013
Net income attributable to Alexandria Real Estate Equities, Inc.:	'		'
Income from continuing operations	$40,911		$29,400
Less: net income attributable to noncontrolling interests	-1,195		-982
Income from continuing operations attributable to Alexandria Real Estate Equities, Inc.	39,716		28,418
(Loss) income from discontinued operations	-162	[1]	837	[1]
Less: net income from discontinued operations attributable to noncontrolling interests	0		0
Net income attributable to Alexandria Real Estate Equities, Inc.	$39,554		$29,255
[1]	(Loss) income from discontinued operations includes the results of operations of four properties that were classified as “held for sale” as of March 31, 2014, as well as the results of operations (prior to disposition) and loss on sale of real estate attributable to seven properties sold during the period from January 1, 2013, to March 31, 2014.

Stockholders_equity_Details

Stockholders' equity (Details) (USD $)	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014
Issuances of common stock	'
Dividends declared on common stock	$50,154
Dividends declared on common stock (dollar per share)	$0.70
Dividends declared on preferred stock	6,471
Preferred stock, shares authorized	100,000,000
Number of shares issued and outstanding	15,200,000
Number of "excess stock" authorized (in shares)	200,000,000
Number of excess stock authorized issued and outstanding (in shares)	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 $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014
Increase (Decrease) Accumulated Other Comprehensive Income (Loss) Net of Tax [Roll Forward]	'
Balance as of December 31, 2013	($36,204)
Other comprehensive income (loss) before reclassifications	21,265
Amounts reclassified from other comprehensive income	-3,490
Net other comprehensive income (loss)	17,775
Balance as of March 31, 2014	-18,429
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 (loss) before reclassifications	18,779
Amounts reclassified from other comprehensive income	0
Net other comprehensive income (loss)	18,779
Balance as of March 31, 2014	20,369
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 (loss) before reclassifications	5,592
Amounts reclassified from other comprehensive income	-3,490
Net other comprehensive income (loss)	2,102
Balance as of March 31, 2014	-1,219
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 (loss) before reclassifications	-3,106
Amounts reclassified from other comprehensive income	0
Net other comprehensive income (loss)	-3,106
Balance as of March 31, 2014	($37,579)

Noncontrolling_interests_Detai

Noncontrolling interests (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Noncontrolling interests	'	'
Redeemable noncontrolling interest balances	$14,413	$14,444
Remaining noncontrolling interests	67,356	47,708
Noncontrolling Interests	'	'
Noncontrolling interests	'	'
Number of properties owned	10	'
Number of development parcels owned	3	'
Remaining noncontrolling interests	67,400	47,700
Redeemable Noncontrolling Interests	'	'
Noncontrolling interests	'	'
Redeemable noncontrolling interest balances	$14,400	$14,400

Discontinued_operations_Detail

Discontinued operations (Details) (USD $)	3 Months Ended				15 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014		Mar. 31, 2013		Mar. 31, 2014	Dec. 31, 2013
	property				property
Net assets of discontinued operations	'		'		'	'
Properties "held for sale, "net	$7,653		'		$7,653	$7,644
Other assets	157		'		157	103
Total assets	7,810		'		7,810	7,747
Total liabilities	-132		'		-132	-266
Net assets of discontinued operations	7,678		'		7,678	7,481
Income from discontinued operations, net	'		'		'	'
Total revenues	0		3,792		'	'
Operating expenses	-162		-1,449		'	'
Total revenues less operating expenses from discontinued operations	-162		2,343		'	'
Depreciation expense	0		-1,166		'	'
Loss on sale of real estate	0		-340		'	'
(Loss) income from discontinued operations	($162)	[1]	$837	[1]	'	'
Number of operating properties classified as held for sale	4		'		'	'
Number of properties sold	'		'		7	'
[1]	(Loss) income from discontinued operations includes the results of operations of four properties that were classified as “held for sale” as of March 31, 2014, as well as the results of operations (prior to disposition) and loss on sale of real estate attributable to seven properties sold during the period from January 1, 2013, to March 31, 2014.

Subsequent_events_Narrative_De

Subsequent events Narrative (Details) (Subsequent Event [Member], 500 Townsend Street [Member], USD $)	1 Months Ended
In Millions, unless otherwise specified	Apr. 30, 2014
	sqft
Subsequent Event [Member] | 500 Townsend Street [Member]	'
Subsequent Event [Line Items]	'
Area of real estate property	300,000
Payments to acquire real estate property	$50

Condensed_consolidating_financ2

Condensed consolidating financial information Balance Sheet (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Assets	'	'	'	'
Investments in real estate, net	$6,930,262	$6,776,914	'	'
Cash and cash equivalents	74,970	57,696	87,001	140,971
Restricted cash	30,454	27,709	'	'
Tenant receivables	10,619	9,918	'	'
Deferred rent	202,087	190,425	'	'
Deferred leasing and financing costs, net	192,618	192,658	'	'
Investments	169,322	140,288	'	'
Investments in and advances to affiliates	0	0	'	'
Other assets	145,707	134,156	'	'
Total assets	7,756,039	7,529,764	'	'
Liabilities, Noncontrolling Interests, and Equity	'	'	'	'
Secured notes payable	597,511	708,831	'	'
Unsecured senior notes payable	1,048,270	1,048,230	'	'
Unsecured senior line of credit	506,000	204,000	'	'
Unsecured senior bank term loans	1,100,000	1,100,000	'	'
Accounts payable, accrued expenses, and tenant security deposits	443,893	435,342	'	'
Dividends payable	55,860	54,420	'	'
Total liabilities	3,751,534	3,550,823	'	'
Redeemable noncontrolling interests	14,413	14,444	'	'
Alexandria Real Estate Equities, Inc.’s stockholders’ equity	3,922,736	3,916,789	'	'
Noncontrolling interests	67,356	47,708	'	'
Total equity	3,990,092	3,964,497	'	'
Total liabilities, noncontrolling interests, and equity	7,756,039	7,529,764	'	'
Alexandria Real Estate Equities, Inc. (Issuer)	'	'	'	'
Assets	'	'	'	'
Investments in real estate, net	0	0	'	'
Cash and cash equivalents	36,379	14,790	39,012	98,567
Restricted cash	54	55	'	'
Tenant receivables	0	0	'	'
Deferred rent	0	0	'	'
Deferred leasing and financing costs, net	35,051	36,901	'	'
Investments	0	0	'	'
Investments in and advances to affiliates	6,601,258	6,299,551	'	'
Other assets	18,755	20,226	'	'
Total assets	6,691,497	6,371,523	'	'
Liabilities, Noncontrolling Interests, and Equity	'	'	'	'
Secured notes payable	0	0	'	'
Unsecured senior notes payable	1,048,270	1,048,230	'	'
Unsecured senior line of credit	506,000	204,000	'	'
Unsecured senior bank term loans	1,100,000	1,100,000	'	'
Accounts payable, accrued expenses, and tenant security deposits	58,921	48,373	'	'
Dividends payable	55,570	54,131	'	'
Total liabilities	2,768,761	2,454,734	'	'
Redeemable noncontrolling interests	0	0	'	'
Alexandria Real Estate Equities, Inc.’s stockholders’ equity	3,922,736	3,916,789	'	'
Noncontrolling interests	0	0	'	'
Total equity	3,922,736	3,916,789	'	'
Total liabilities, noncontrolling interests, and equity	6,691,497	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	1,914
Restricted cash	0	0	'	'
Tenant receivables	0	0	'	'
Deferred rent	0	0	'	'
Deferred leasing and financing costs, net	0	0	'	'
Investments	10,868	10,868	'	'
Investments in and advances to affiliates	6,090,900	5,823,058	'	'
Other assets	0	0	'	'
Total assets	6,101,768	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	'	'
Unsecured senior bank term loans	0	0	'	'
Accounts payable, accrued expenses, and tenant security deposits	0	0	'	'
Dividends payable	0	0	'	'
Total liabilities	0	0	'	'
Redeemable noncontrolling interests	0	0	'	'
Alexandria Real Estate Equities, Inc.’s stockholders’ equity	6,101,768	5,833,926	'	'
Noncontrolling interests	0	0	'	'
Total equity	6,101,768	5,833,926	'	'
Total liabilities, noncontrolling interests, and equity	6,101,768	5,833,926	'	'
Combined Non- Guarantor Subsidiaries	'	'	'	'
Assets	'	'	'	'
Investments in real estate, net	6,930,262	6,776,914	'	'
Cash and cash equivalents	38,591	42,906	47,989	40,490
Restricted cash	30,400	27,654	'	'
Tenant receivables	10,619	9,918	'	'
Deferred rent	202,087	190,425	'	'
Deferred leasing and financing costs, net	157,567	155,757	'	'
Investments	158,454	129,420	'	'
Investments in and advances to affiliates	124,891	119,421	'	'
Other assets	126,952	113,930	'	'
Total assets	7,779,823	7,566,345	'	'
Liabilities, Noncontrolling Interests, and Equity	'	'	'	'
Secured notes payable	597,511	708,831	'	'
Unsecured senior notes payable	0	0	'	'
Unsecured senior line of credit	0	0	'	'
Unsecured senior bank term loans	0	0	'	'
Accounts payable, accrued expenses, and tenant security deposits	384,972	386,969	'	'
Dividends payable	290	289	'	'
Total liabilities	982,773	1,096,089	'	'
Redeemable noncontrolling interests	14,413	14,444	'	'
Alexandria Real Estate Equities, Inc.’s stockholders’ equity	6,715,281	6,408,104	'	'
Noncontrolling interests	67,356	47,708	'	'
Total equity	6,782,637	6,455,812	'	'
Total liabilities, noncontrolling interests, and equity	7,779,823	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	'	'
Investments	0	0	'	'
Investments in and advances to affiliates	-12,817,049	-12,242,030	'	'
Other assets	0	0	'	'
Total assets	-12,817,049	-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	'	'
Unsecured senior bank term loans	0	0	'	'
Accounts payable, accrued expenses, and tenant security deposits	0	0	'	'
Dividends payable	0	0	'	'
Total liabilities	0	0	'	'
Redeemable noncontrolling interests	0	0	'	'
Alexandria Real Estate Equities, Inc.’s stockholders’ equity	-12,817,049	-12,242,030	'	'
Noncontrolling interests	0	0	'	'
Total equity	-12,817,049	-12,242,030	'	'
Total liabilities, noncontrolling interests, and equity	($12,817,049)	($12,242,030)	'	'

Condensed_consolidating_financ3

Condensed consolidating financial information Income Statement (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014		Mar. 31, 2013
Revenues:	'		'
Rental	$130,570		$111,526
Tenant recoveries	41,682		35,565
Other Income	3,934		2,992
Total revenues	176,186		150,083
Expenses:	'		'
Rental operations	52,507		45,186
General and administrative	13,224		11,648
Interest	19,123		18,020
Depreciation and amortization	50,421		45,829
Total expenses	135,275		120,683
(Loss) income from continuing operations before equity in earnings of affiliates	40,911		'
Equity in earnings of affiliates	0		0
Income from continuing operations	40,911		29,400
(Loss) income from discontinued operations	-162	[1]	837	[1]
Net income	40,749		30,237
Net income attributable to noncontrolling interests	1,195		982
Dividends on preferred stock	6,471		6,471
Net income attributable to unvested restricted stock awards	374		342
Net income attributable to Alexandria’s common stockholders	32,709		22,442
Alexandria Real Estate Equities, Inc. (Issuer)	'		'
Revenues:	'		'
Rental	0		0
Tenant recoveries	0		0
Other Income	2,919		2,595
Total revenues	2,919		2,595
Expenses:	'		'
Rental operations	0		0
General and administrative	10,860		10,269
Interest	13,539		11,720
Depreciation and amortization	1,471		1,475
Total expenses	25,870		23,464
(Loss) income from continuing operations before equity in earnings of affiliates	-22,951		-20,869
Equity in earnings of affiliates	62,505		49,807
Income from continuing operations	39,554		28,938
(Loss) income from discontinued operations	0		317
Net income	39,554		29,255
Net income attributable to noncontrolling interests	0		0
Dividends on preferred stock	6,471		6,471
Net income attributable to unvested restricted stock awards	374		342
Net income attributable to Alexandria’s common stockholders	32,709		22,442
Alexandria Real Estate Equities, L.P. (Guarantor Subsidiary)	'		'
Revenues:	'		'
Rental	0		0
Tenant recoveries	0		0
Other Income	0		-66
Total revenues	0		-66
Expenses:	'		'
Rental operations	0		0
General and administrative	0		0
Interest	0		0
Depreciation and amortization	0		0
Total expenses	0		0
(Loss) income from continuing operations before equity in earnings of affiliates	0		-66
Equity in earnings of affiliates	58,306		47,239
Income from continuing operations	58,306		47,173
(Loss) income from discontinued operations	0		0
Net income	58,306		47,173
Net income attributable to noncontrolling interests	0		0
Dividends on preferred stock	0		0
Net income attributable to unvested restricted stock awards	0		0
Net income attributable to Alexandria’s common stockholders	58,306		47,173
Combined Non- Guarantor Subsidiaries	'		'
Revenues:	'		'
Rental	130,570		111,526
Tenant recoveries	41,682		35,565
Other Income	4,633		3,571
Total revenues	176,885		150,662
Expenses:	'		'
Rental operations	52,507		45,186
General and administrative	5,982		4,487
Interest	5,584		6,300
Depreciation and amortization	48,950		44,354
Total expenses	113,023		100,327
(Loss) income from continuing operations before equity in earnings of affiliates	63,862		50,335
Equity in earnings of affiliates	1,148		960
Income from continuing operations	65,010		51,295
(Loss) income from discontinued operations	-162		520
Net income	64,848		51,815
Net income attributable to noncontrolling interests	1,195		982
Dividends on preferred stock	0		0
Net income attributable to unvested restricted stock awards	0		0
Net income attributable to Alexandria’s common stockholders	63,653		50,833
Eliminations	'		'
Revenues:	'		'
Rental	0		0
Tenant recoveries	0		0
Other Income	-3,618		-3,108
Total revenues	-3,618		-3,108
Expenses:	'		'
Rental operations	0		0
General and administrative	-3,618		-3,108
Interest	0		0
Depreciation and amortization	0		0
Total expenses	-3,618		-3,108
(Loss) income from continuing operations before equity in earnings of affiliates	0		0
Equity in earnings of affiliates	-121,959		-98,006
Income from continuing operations	-121,959		-98,006
(Loss) income from discontinued operations	0		0
Net income	-121,959		-98,006
Net income attributable to noncontrolling interests	0		0
Dividends on preferred stock	0		0
Net income attributable to unvested restricted stock awards	0		0
Net income attributable to Alexandria’s common stockholders	($121,959)		($98,006)
[1]	(Loss) income from discontinued operations includes the results of operations of four properties that were classified as “held for sale” as of March 31, 2014, as well as the results of operations (prior to disposition) and loss on sale of real estate attributable to seven properties sold during the period from January 1, 2013, to March 31, 2014.

Condensed_consolidating_financ4

Condensed consolidating financial information Comprehensive Income (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Net income	$40,749	$30,237
Unrealized gains on marketable securities:	'	'
Unrealized holding (losses) gains arising during the period	18,779	316
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax	0	-272
Unrealized gains on marketable securities, net	18,779	44
Unrealized gains on interest rate swap agreements:	'	'
Unrealized interest rate swap gains arising during the period	5,592	-133
Reclassification adjustment for amortization of interest expense included in net income	-3,490	4,308
Unrealized gains on interest rate swap agreements, net	2,102	4,175
Foreign currency translation losses	-3,106	-2,360
Total other comprehensive income (loss)	17,775	1,859
Comprehensive income	58,524	32,096
Less: comprehensive income attributable to noncontrolling interests	-1,195	-898
Comprehensive income attributable to Alexandria’s common stockholders	57,329	31,198
Alexandria Real Estate Equities, Inc. (Issuer)	'	'
Net income	39,554	29,255
Unrealized gains on marketable securities:	'	'
Unrealized holding (losses) gains arising during the period	0	0
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax	0	0
Unrealized gains on marketable securities, net	0	0
Unrealized gains on interest rate swap agreements:	'	'
Unrealized interest rate swap gains arising during the period	5,592	-133
Reclassification adjustment for amortization of interest expense included in net income	-3,490	4,308
Unrealized gains on interest rate swap agreements, net	2,102	4,175
Foreign currency translation losses	0	0
Total other comprehensive income (loss)	2,102	4,175
Comprehensive income	41,656	33,430
Less: comprehensive income attributable to noncontrolling interests	0	0
Comprehensive income attributable to Alexandria’s common stockholders	41,656	33,430
Alexandria Real Estate Equities, L.P. (Guarantor Subsidiary)	'	'
Net income	58,306	47,173
Unrealized gains on marketable securities:	'	'
Unrealized holding (losses) gains arising during the period	0	-8
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax	0	38
Unrealized gains on marketable securities, net	0	30
Unrealized gains on interest rate swap agreements:	'	'
Unrealized interest rate swap gains arising during the period	0	0
Reclassification adjustment for amortization of interest expense included in net income	0	0
Unrealized gains on interest rate swap agreements, net	0	0
Foreign currency translation losses	0	0
Total other comprehensive income (loss)	0	30
Comprehensive income	58,306	47,203
Less: comprehensive income attributable to noncontrolling interests	0	0
Comprehensive income attributable to Alexandria’s common stockholders	58,306	47,203
Combined Non- Guarantor Subsidiaries	'	'
Net income	64,848	51,815
Unrealized gains on marketable securities:	'	'
Unrealized holding (losses) gains arising during the period	18,779	324
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax	0	-310
Unrealized gains on marketable securities, net	18,779	14
Unrealized gains on interest rate swap agreements:	'	'
Unrealized interest rate swap gains arising during the period	0	0
Reclassification adjustment for amortization of interest expense included in net income	0	0
Unrealized gains on interest rate swap agreements, net	0	0
Foreign currency translation losses	-3,106	-2,360
Total other comprehensive income (loss)	15,673	-2,346
Comprehensive income	80,521	49,469
Less: comprehensive income attributable to noncontrolling interests	-1,195	-898
Comprehensive income attributable to Alexandria’s common stockholders	79,326	48,571
Eliminations	'	'
Net income	-121,959	-98,006
Unrealized gains on marketable securities:	'	'
Unrealized holding (losses) gains arising during the period	0	0
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax	0	0
Unrealized gains on marketable securities, net	0	0
Unrealized gains on interest rate swap agreements:	'	'
Unrealized interest rate swap gains arising during the period	0	0
Reclassification adjustment for amortization of interest expense included in net income	0	0
Unrealized gains on interest rate swap agreements, net	0	0
Foreign currency translation losses	0	0
Total other comprehensive income (loss)	0	0
Comprehensive income	-121,959	-98,006
Less: comprehensive income attributable to noncontrolling interests	0	0
Comprehensive income attributable to Alexandria’s common stockholders	($121,959)	($98,006)

Condensed_consolidating_financ5

Condensed consolidating financial information Cash Flows (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Operating Activities	'	'
Net income	$40,749	$30,237
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation and amortization	50,421	46,995
Loss on sale of real estate	0	340
Amortization of loan fees and costs	2,561	2,386
Amortization of debt premiums/discounts	205	115
Amortization of acquired above and below market leases	-816	-830
Deferred rent	-11,882	-6,198
Stock compensation expense	3,228	3,349
Equity in (income) loss related to subsidiaries	0	0
Investment gains	-4,040	-446
Investment losses	1,694	386
Changes in operating assets and liabilities:	'	'
Restricted cash	0	1,506
Tenant receivables	-690	-818
Deferred leasing costs	-7,572	-11,757
Other assets	-17,315	-7,302
Intercompany receivables and payables	'	0
Accounts payable, accrued expenses, and tenant security deposits	16,716	-10,722
Net cash (used in) provided by operating activities	73,259	47,241
Investing Activities	'	'
Proceeds from sale of properties	0	80,203
Additions to properties	-111,587	-139,245
Purchase of properties	-42,338	0
Change in restricted cash related to construction projects	-140	-17
Contributions to unconsolidated real estate entity	-747	-2,074
Investments in subsidiaries	0	0
Additions to investments	-11,905	-10,363
Proceeds from investments	3,998	1,972
Net cash (used in) provided by investing activities	-162,719	-69,524
Financing Activities	'	'
Borrowings from secured notes payable	51,030	17,215
Repayments of borrowings from secured notes payable	-210,844	-2,749
Principal borrowings from unsecured senior line of credit	360,000	179,000
Repayments of borrowings from unsecured senior line of credit	-58,000	-191,000
Transfers to/from parent company	0	0
Change in restricted cash related to financings	1,059	8,656
Deferred financing costs paid	-8	-46
Dividends paid on common stock	-48,714	-35,687
Dividends paid on preferred stock	-6,471	-6,471
Contributions by noncontrolling interests	19,410	0
Distributions to noncontrolling interests	-988	-427
Net cash provided by (used in) financing activities	106,474	-31,509
Effect of foreign exchange rate changes on cash and cash equivalents	260	-178
Net increase (decrease) in cash and cash equivalents	17,274	-53,970
Cash and cash equivalents at beginning of period	57,696	140,971
Cash and cash equivalents at end of period	74,970	87,001
Supplemental Disclosure of Cash Flow Information	'	'
Cash paid during the period for interest, net of interest capitalized	6,093	9,964
Non-Cash Investing Activities	'	'
Note receivable from sale of real estate	0	38,820
Change in accrued capital expenditures	-6,028	-37,045
Assumption of secured notes payable in connection with purchase of properties	-48,329	0
Alexandria Real Estate Equities, Inc. (Issuer)	'	'
Operating Activities	'	'
Net income	39,554	29,255
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation and amortization	1,471	1,473
Loss on sale of real estate	'	0
Amortization of loan fees and costs	1,770	1,680
Amortization of debt premiums/discounts	40	11
Amortization of acquired above and below market leases	0	0
Deferred rent	0	0
Stock compensation expense	3,228	3,349
Equity in (income) loss related to subsidiaries	-62,505	-49,807
Investment gains	0	0
Investment losses	0	0
Changes in operating assets and liabilities:	'	'
Restricted cash	'	7
Tenant receivables	0	-51
Deferred leasing costs	0	-350
Other assets	-748	29,445
Intercompany receivables and payables	'	-21
Accounts payable, accrued expenses, and tenant security deposits	13,478	-16,301
Net cash (used in) provided by operating activities	-3,712	-1,310
Investing Activities	'	'
Proceeds from sale of properties	'	10,796
Additions to properties	0	0
Purchase of properties	0	'
Change in restricted cash related to construction projects	0	0
Contributions to unconsolidated real estate entity	0	0
Investments in subsidiaries	-221,513	-14,842
Additions to investments	0	0
Proceeds from investments	0	0
Net cash (used in) provided by investing activities	-221,513	-4,046
Financing Activities	'	'
Borrowings from secured notes payable	0	0
Repayments of borrowings from secured notes payable	0	0
Principal borrowings from unsecured senior line of credit	360,000	179,000
Repayments of borrowings from unsecured senior line of credit	-58,000	-191,000
Transfers to/from parent company	0	0
Change in restricted cash related to financings	0	0
Deferred financing costs paid	0	-41
Dividends paid on common stock	-48,715	-35,687
Dividends paid on preferred stock	-6,471	-6,471
Contributions by noncontrolling interests	0	'
Distributions to noncontrolling interests	0	0
Net cash provided by (used in) financing activities	246,814	-54,199
Effect of foreign exchange rate changes on cash and cash equivalents	0	0
Net increase (decrease) in cash and cash equivalents	21,589	-59,555
Cash and cash equivalents at beginning of period	14,790	98,567
Cash and cash equivalents at end of period	36,379	39,012
Supplemental Disclosure of Cash Flow Information	'	'
Cash paid during the period for interest, net of interest capitalized	347	3,735
Non-Cash Investing Activities	'	'
Note receivable from sale of real estate	'	29,820
Change in accrued capital expenditures	0	0
Assumption of secured notes payable in connection with purchase of properties	0	'
Alexandria Real Estate Equities, L.P. (Guarantor Subsidiary)	'	'
Operating Activities	'	'
Net income	58,306	47,173
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation and amortization	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 acquired above and below market leases	0	0
Deferred rent	0	0
Stock compensation expense	0	0
Equity in (income) loss related to subsidiaries	-58,306	-47,239
Investment gains	0	-121
Investment losses	0	187
Changes in operating assets and liabilities:	'	'
Restricted cash	'	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
Additions to properties	0	0
Purchase of properties	0	'
Change in restricted cash related to construction projects	0	0
Contributions to unconsolidated real estate entity	0	0
Investments in subsidiaries	-193,863	-30,986
Additions to investments	0	-3
Proceeds from investments	0	252
Net cash (used in) provided by investing activities	-193,863	-30,737
Financing Activities	'	'
Borrowings from secured notes payable	0	0
Repayments of borrowings from secured notes payable	0	0
Principal borrowings from unsecured senior line of credit	0	0
Repayments of borrowings from unsecured senior line of credit	0	0
Transfers to/from parent company	193,863	28,823
Change in restricted cash related to financings	0	0
Deferred financing costs paid	0	0
Dividends paid on common stock	0	0
Dividends paid on preferred stock	0	0
Contributions by noncontrolling interests	0	'
Distributions to noncontrolling interests	0	0
Net cash provided by (used in) financing activities	193,863	28,823
Effect of foreign exchange rate changes on cash and cash equivalents	0	0
Net increase (decrease) in cash and cash equivalents	0	-1,914
Cash and cash equivalents at beginning of period	0	1,914
Cash and cash equivalents at end of period	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
Change in accrued capital expenditures	0	0
Assumption of secured notes payable in connection with purchase of properties	0	'
Combined Non- Guarantor Subsidiaries	'	'
Operating Activities	'	'
Net income	64,848	51,815
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation and amortization	48,950	45,522
Loss on sale of real estate	'	340
Amortization of loan fees and costs	791	706
Amortization of debt premiums/discounts	165	104
Amortization of acquired above and below market leases	-816	-830
Deferred rent	-11,882	-6,198
Stock compensation expense	0	0
Equity in (income) loss related to subsidiaries	-1,148	-960
Investment gains	-4,040	-325
Investment losses	1,694	199
Changes in operating assets and liabilities:	'	'
Restricted cash	'	1,499
Tenant receivables	-690	-767
Deferred leasing costs	-7,572	-11,407
Other assets	-16,567	-36,747
Intercompany receivables and payables	'	21
Accounts payable, accrued expenses, and tenant security deposits	3,238	5,579
Net cash (used in) provided by operating activities	76,971	48,551
Investing Activities	'	'
Proceeds from sale of properties	'	69,407
Additions to properties	-111,587	-139,245
Purchase of properties	-42,338	'
Change in restricted cash related to construction projects	-140	-17
Contributions to unconsolidated real estate entity	-747	-2,074
Investments in subsidiaries	-6,338	0
Additions to investments	-11,905	-10,360
Proceeds from investments	3,998	1,720
Net cash (used in) provided by investing activities	-169,057	-80,569
Financing Activities	'	'
Borrowings from secured notes payable	51,030	17,215
Repayments of borrowings from secured notes payable	-210,844	-2,749
Principal borrowings from unsecured senior line of credit	0	0
Repayments of borrowings from unsecured senior line of credit	0	0
Transfers to/from parent company	227,851	17,005
Change in restricted cash related to financings	1,059	8,656
Deferred financing costs paid	-8	-5
Dividends paid on common stock	1	0
Dividends paid on preferred stock	0	0
Contributions by noncontrolling interests	19,410	'
Distributions to noncontrolling interests	-988	-427
Net cash provided by (used in) financing activities	87,511	39,695
Effect of foreign exchange rate changes on cash and cash equivalents	260	-178
Net increase (decrease) in cash and cash equivalents	-4,315	7,499
Cash and cash equivalents at beginning of period	42,906	40,490
Cash and cash equivalents at end of period	38,591	47,989
Supplemental Disclosure of Cash Flow Information	'	'
Cash paid during the period for interest, net of interest capitalized	5,746	6,229
Non-Cash Investing Activities	'	'
Note receivable from sale of real estate	'	9,000
Change in accrued capital expenditures	-6,028	-37,045
Assumption of secured notes payable in connection with purchase of properties	-48,329	'
Eliminations	'	'
Operating Activities	'	'
Net income	-121,959	-98,006
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation and amortization	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 acquired above and below market leases	0	0
Deferred rent	0	0
Stock compensation expense	0	0
Equity in (income) loss related to subsidiaries	121,959	98,006
Investment gains	0	0
Investment losses	0	0
Changes in operating assets and liabilities:	'	'
Restricted cash	'	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
Additions to properties	0	0
Purchase of properties	0	'
Change in restricted cash related to construction projects	0	0
Contributions to unconsolidated real estate entity	0	0
Investments in subsidiaries	421,714	45,828
Additions to investments	0	0
Proceeds from investments	0	0
Net cash (used in) provided by investing activities	421,714	45,828
Financing Activities	'	'
Borrowings from secured notes payable	0	0
Repayments of borrowings from secured notes payable	0	0
Principal borrowings from unsecured senior line of credit	0	0
Repayments of borrowings from unsecured senior line of credit	0	0
Transfers to/from parent company	-421,714	-45,828
Change in restricted cash related to financings	0	0
Deferred financing costs paid	0	0
Dividends paid on common stock	0	0
Dividends paid on preferred stock	0	0
Contributions by noncontrolling interests	0	'
Distributions to noncontrolling interests	0	0
Net cash provided by (used in) financing activities	-421,714	-45,828
Effect of foreign exchange rate changes on cash and cash equivalents	0	0
Net increase (decrease) 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
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
Change in accrued capital expenditures	0	0
Assumption of secured notes payable in connection with purchase of properties	$0	'