Investment in Direct Financing Lease (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2011 officetower
Investment in Direct Financing Lease
Percentage of term exceeding useful life of one office tower (as a percent)	75.00%
Number of office towers located within a mixed use property	1
Total minimum lease payments receivable	$ 41,207
Estimated unguaranteed residual value of leased asset	4,951
Unearned income	(11,166)
Net investment in direct financing lease	34,992
Future minimum rentals receivable on direct financing lease
2011	2,024
2012	8,098
2013	8,098
2014	8,098
2015	8,098
Thereafter	$ 6,791

Represents the number of office towers located within a mixed use property.

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Represents the percentage of the term exceeding the useful life of one office tower.

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Future rental payments receivable within one year of the balance sheet date on nonoperating leases (direct financing, sales-type and leveraged leases).

+ References

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 13

-Paragraph 23

-Subparagraph a(ii)

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-Publisher FASB

-Name Accounting Standards Codification

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-Section 50

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Future lease rental payments receivable after the fifth year from the balance sheet date on nonoperating leases (direct financing, sales-type and leveraged leases).

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-Publisher FASB

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Future lease rental payments receivable within the fifth year from the balance sheet date on nonoperating leases (direct financing, sales-type and leveraged leases).

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Future lease rental payments receivable within the fourth year from the balance sheet date on nonoperating leases (direct financing, sales-type and leveraged leases).

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Future lease rental payments receivable within the third year from the balance sheet date on nonoperating leases (direct financing, sales-type and leveraged leases).

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Future rental payments receivable within the second year from the balance sheet date on nonoperating leases (direct financing, sales-type and leveraged leases).

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- Definition

The net investment in direct financing leases as of the balance sheet date consisting of: (a) minimum lease payments due on direct financing leases, (b) unguaranteed residual value, and (c) any unamortized initial direct costs; less: (i) executory costs, (ii) unearned income, and (iii) the accumulated allowance for uncollectible minimum lease payments.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 13

-Paragraph 23

-Subparagraph a(i)

-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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The remaining (unamortized) difference between the gross investment in a direct financing lease and the cost or carrying amount, if different, of the leased property as of the balance sheet date.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 13

-Paragraph 18

-Subparagraph b

-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

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-Name Statement of Financial Accounting Standard (FAS)

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-Subparagraph a(i)(d)

-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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Amount of remaining payments as of the balance sheet date that lessees are obligated to make or can be required to make under direct financing leases, including any guarantee of residual value and executory costs. The amount also includes any guaranteed rental payments by an unrelated third-party provided that are financially capable of making such payments.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 13

-Paragraph 23

-Subparagraph a(i)(a)

-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

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-SubTopic 30

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The estimate of the lease property's economic value at the end of the direct financing lease term excluding any amounts guaranteed by either the lessee or a third-party.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 13

-Paragraph 23

-Subparagraph a(i)(b)

-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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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 30

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