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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
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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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