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Investments in Unconsolidated Joint Ventures: (Details)	Dec. 31, 2011 Biltmore Shopping Center Partners LLC	Dec. 31, 2011 Camelback Colonnade Associates LP	Dec. 31, 2011 Chandler Gateway Partners LLC	Dec. 31, 2011 Chandler Village Center, LLC	Dec. 31, 2011 Coolidge Holding	Dec. 31, 2011 Corte Madera Village, LLC	Dec. 31, 2011 Superstition Springs Center	Jun. 03, 2011 Superstition Springs Center	Dec. 31, 2011 FlatIron Crossing	Dec. 31, 2011 Jaren Associates #4	Dec. 31, 2011 Kierland Commons Investment LLC	Dec. 31, 2011 Kierland Tower Lofts, LLC	Dec. 31, 2011 La Sandia Santa Monica LLC	Dec. 31, 2011 Macerich Northwestern Associates - Broadway Plaza	Dec. 31, 2011 MetroRising AMS Holding LLC	Dec. 31, 2011 New River Associates-Arrowhead Towne Center	Dec. 31, 2011 Norcino Santa Monica, LLC	Dec. 31, 2011 North Bridge Chicago LLC	Dec. 31, 2011 NorthPark Land Partners, LP	Dec. 31, 2011 NorthPark Partners, LP	Dec. 31, 2011 One Scottsdale	Dec. 31, 2011 Pacific Premier Retail LP	Dec. 31, 2011 Propcor Associates	Dec. 31, 2011 Propcor II Associates, LLC Boulevard Shops	Dec. 31, 2011 Primi Santa Monica, LLC	Dec. 31, 2011 SanTan Festival, LLC - Chandler Festival	Dec. 31, 2011 SanTan Village Phase 2 LLC	Dec. 31, 2011 SDG Macerich Properties, L. P.	Dec. 31, 2011 Queens Mall Limited Partnership	Dec. 31, 2011 Queens Mall Expansion Limited Partnership	Dec. 31, 2011 Scottsdale Fashion Square Partnership	Dec. 31, 2011 The Market at Estrella Falls LLC	Dec. 31, 2011 Tysons Corner LLC	Dec. 31, 2011 Tysons Corner Property Holdings II LLC	Dec. 31, 2011 Tysons Corner Property LLC	Dec. 31, 2011 WM Inland LP	Dec. 31, 2011 West Acres Development, LLP	Dec. 31, 2011 Westcor/Gilbert, L.L.C.	Dec. 31, 2011 Westcor/Queen Creek LLC	Dec. 31, 2011 Westcor/Surprise Auto Park LLC	Dec. 31, 2011 Wilshire Building - Tenants in Common	Dec. 31, 2011 WMAP, L.L.C. Atlas Park	Dec. 31, 2011 WM Ridgmar, L.P.	Dec. 31, 2011 Zengo Restaurant Santa Monica LLC	Feb. 24, 2011 Kierland Commons
Investments in unconsolidated joint ventures:
Percentage ownership	50.00%	75.00%	50.00%	50.00%	37.50%	50.10%	66.70%	66.70%	25.00%	12.50%	50.00%	15.00%	50.00%	50.00%	15.00%	66.70%	50.00%	50.00%	50.00%	50.00%	50.00%	51.00%	25.00%	50.00%	50.00%	50.00%	34.90%	50.00%	51.00%	51.00%	50.00%	39.70%	50.00%	50.00%	50.00%	50.00%	19.00%	50.00%	37.80%	33.30%	30.00%	50.00%	50.00%	50.00%	50.00%

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 159

-Paragraph 18

-Subparagraph f

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 18

-Paragraph 20

-Subparagraph a (1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

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