(Dollars in thousands, except share and per share amounts and where indicated as in millions or billions) Guarantees of Indebtedness Concentration of Credit Risk Limited Life Partnerships 12. RELATED PARTY TRANSACTIONS Joint venture debt is the liability of the joint venture and is typically secured by the joint venture property, which is non- recourse to us. As of December 31, 2011 and 2010, the Operating Partnership guaranteed joint venture related mortgage or other  indebtedness of $30.2 million and $60.7 million, respectively. Mortgages which are guaranteed by us are secured by the property  of the joint venture and that property could be sold in order to satisfy the outstanding obligation. We are subject to risks incidental to the ownership and operation of commercial real estate. These risks include, among  others, the risks normally associated with changes in the general economic climate, trends in the retail industry, creditworthiness  of tenants, competition for tenants and customers, changes in tax laws, interest rate and foreign currency levels, the availability  of financing, and potential liability under environmental and other laws. Our regional malls, Premium Outlets, The Mills, and  community/lifestyle centers rely heavily upon anchor tenants like most retail properties. Four retailers occupied 516 of the  approximately 1,323 anchor stores in the properties as of December 31, 2011. An affiliate of one of these retailers is a limited  partner in the Operating Partnership. Further, all material operations are within the United States and no customer or tenant  comprises more than 10% of consolidated revenues. During 2011, 2010 and 2009, we recorded interest income of $9.8 million, $9.9 million and $9.3 million, respectively, and  financing fee income of $1.0 million, $0.9 million and $3.7 million, respectively, net of inter-entity eliminations, related to the loans  that we have provided to Mills and SPG-FCM and lending financing services to those entities and the properties in which they hold  an ownership interest. Our management company provides management, insurance, and other services to Melvin Simon & Associates, Inc., a related  party, and other non-owned properties. Amounts for services provided by our management company and its affiliates to our  unconsolidated joint ventures and other related parties were as follows: We are the controlling partner in several consolidated partnerships that have a limited life. We estimated the settlement  values of these noncontrolling interests as of December 31, 2011 and 2010 as approximately $140 million and $135 million,  respectively. The settlement values are based on the estimated fair values upon a hypothetical liquidation of the partnership  interests and estimated yield maintenance or prepayment penalties associated with the payment to settle any underlying secured  mortgage debt. NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 62 Simon Property Group, Inc. For the Year Ended December 31, 2011 2010 2009 Amounts charged to unconsolidated joint ventures  $125,306 $118,905  $120,866 Amounts charged to properties owned by related parties  4,353 4,308 4,522