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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
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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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