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Investments in Unconsolidated Joint Ventures: (Details)	Dec. 31, 2012 Biltmore Shopping Center Partners LLC	Dec. 31, 2012 Camelback Colonnade Associates LP	Dec. 31, 2012 Coolidge Holding	Dec. 31, 2012 Corte Madera Village, LLC	Dec. 31, 2012 Superstition Springs Center	Jun. 03, 2011 Superstition Springs Center	Dec. 31, 2012 Jaren Associates #4	Dec. 31, 2012 Kierland Commons Investment LLC	Feb. 24, 2011 Kierland Commons Investment LLC	Dec. 31, 2012 Kierland Tower Lofts, LLC	Dec. 31, 2012 La Sandia Santa Monica LLC	Dec. 31, 2012 Macerich Northwestern Associates - Broadway Plaza	Dec. 31, 2012 MetroRising AMS Holding LLC	Dec. 31, 2012 North Bridge Chicago LLC	Dec. 31, 2012 One Scottsdale Investors LLC	Dec. 31, 2012 Pacific Premier Retail LP	Dec. 31, 2012 Propcor Associates	Dec. 31, 2012 Propcor II Associates, LLC Boulevard Shops	Dec. 31, 2012 Queens Center	Dec. 31, 2012 Scottsdale Fashion Square Partnership	Dec. 31, 2012 The Market at Estrella Falls LLC	Dec. 31, 2012 Tysons Corner LLC	Dec. 31, 2012 Tysons Corner Property Holdings II LLC	Dec. 31, 2012 Tysons Corner Property LLC	Dec. 31, 2012 West Acres Development, LLP	Dec. 31, 2012 Westcor/Gilbert, L.L.C.	Dec. 31, 2012 Westcor/Queen Creek LLC	Dec. 31, 2012 Westcor/Surprise Auto Park LLC	Dec. 31, 2012 Wilshire Building - Tenants in Common	Dec. 31, 2012 WMAP, L.L.C. Atlas Park	Dec. 31, 2012 WM Inland LP	Dec. 31, 2012 WM Ridgmar, L.P.	Dec. 31, 2012 Zengo Restaurant Santa Monica LLC
Investments in unconsolidated joint ventures:
Percentage ownership	50.00%	73.20%	37.50%	50.10%	66.70%	66.70%	12.50%	50.00%	50.00%	15.00%	50.00%	50.00%	15.00%	50.00%	50.00%	51.00%	25.00%	50.00%	51.00%	50.00%	39.70%	50.00%	50.00%	50.00%	19.00%	50.00%	37.90%	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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 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



Reference 3: 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.

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