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Significant Accounting Policies (Tables) | 9 Months Ended
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Sep. 30, 2024
Accounting Policies [Abstract] |
Schedule of Identified Intangible Assets and Intangible Liabilities | The following summarizes our identified intangible assets (acquired above-market leases and in-place leases) and intangible liabilities (acquired below-market leases) as of September 30, 2024 and December 31, 2023 (in thousands):
| September 30, 2024 |  | December 31, 2023
Identified intangible assets (included in other assets): |  |  |
Gross amount | $ | 273,010 |  |  | $ | 189,680 |
Accumulated amortization | (193,327) |  |  | (184,902) |
Net | $ | 79,683 |  |  | $ | 4,778 |
Identified intangible liabilities (included in deferred revenue): |  |  |
Gross amount | $ | 226,034 |  |  | $ | 205,394 |
Accumulated amortization | (203,459) |  |  | (202,089) |
Net | $ | 22,575 |  |  | $ | 3,305 |
Schedule of Marketable Securities | As of September 30, 2024 and December 31, 2023, we held the following marketable securities (in thousands):
| September 30, 2024 |  | December 31, 2023
Commercial mortgage-backed securities | $ | 16,522 |  |  | $ | 9,591 |
Total investment in marketable securities | $ | 16,522 |  |  | $ | 9,591 |
Schedule of Properties Contributed of Annualized Cash Rent | For the three months ended September 30, 2024, the following properties contributed more than 5.0% of our annualized cash rent from office properties, including our share of annualized cash rent from joint venture office properties:
Property | Three months ended September 30, 2024
One Vanderbilt Avenue | 17.2%
11 Madison Avenue | 8.7%
420 Lexington Ave | 7.0%
1515 Broadway | 6.7%
245 Park Avenue | 6.0%
1185 Avenue of the Americas | 5.9%
280 Park Avenue | 5.1%
Schedule of Real Estate CMBS Securitization Trusts | As of September 30, 2024 and December 31, 2023, we consolidated the following CMBS securitization trusts (in thousands):
| September 30, 2024 |  | December 31, 2023 |  | Maturity |
Type | Fair Value (1) |  | Principal Value |  |  | Fair Value | Principal Value |  |  |
Real estate loans held by consolidated securitization vehicles | $ | 713,218 |  | (2) | $ | 894,000 |  |  |  | $ | — |  | $ | — |  |  |  | 2023 - 2024 | (3)
Senior obligations of consolidated securitization vehicles | 603,902 |  | (4) | 703,675 |  |  |  | — |  | — |  |  |  | 2023 - 2024 | (3)
Real estate loans held by consolidated securitization vehicles in excess of senior obligations of consolidated securitization vehicles | $ | 109,316 |  |  | $ | 190,325 |  |  |  | $ | — |  | $ | — |  |  |  |  |
(1)Includes $126.4 million and $32.2 million of assets and liabilities, respectively, for a loan that is on non-accrual and is accounted for on an amortized cost basis. (2)Includes $3.4 million of accrued interest income. (3)The Company is in discussions with the respective borrowers on the resolution of the past maturities. (4)Includes $2.3 million of accrued interest expense.

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