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Real Estate Intangibles | 3 Months Ended
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Mar. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract] |
Real Estate Intangibles | Real Estate Intangibles The following is a summary of our real estate intangibles, excluding those related to ground leases or classified as held for sale, as of the dates indicated (dollars in thousands):
|  | March 31, 2022 |  | December 31, 2021
Assets: |  |  |  |
In place lease intangibles |  | $ | 1,732,980 |  |  | $ | 1,681,533 |
Above market tenant leases |  | 53,988 |  |  | 53,964 |
Lease commissions |  | 57,812 |  |  | 54,131 |
Gross historical cost |  | 1,844,780 |  |  | 1,789,628 |
Accumulated amortization |  | (1,338,046) |  |  | (1,286,259) |
Net book value |  | $ | 506,734 |  |  | $ | 503,369 |
Weighted-average amortization period in years |  | 7.2 |  | 5.5
Liabilities: |  |  |  |
Below market tenant leases |  | $ | 74,910 |  |  | $ | 74,909 |
Accumulated amortization |  | (47,174) |  |  | (45,291) |
Net book value |  | $ | 27,736 |  |  | $ | 29,618 |
Weighted-average amortization period in years |  | 8.3 |  | 8.2
The following is a summary of real estate intangible amortization income (expense) for the periods presented (in thousands):
|  | Three Months Ended March 31, |  |
|  | 2022 |  | 2021 |  |  |  |
Rental income related to (above)/below market tenant leases, net |  | $ | 385 |  |  | $ | 425 |  |  |  |  |
Amortization related to in place lease intangibles and lease commissions |  | (47,994) |  |  | (22,779) |  |  |  |  |
The future estimated aggregate amortization of intangible assets and liabilities is as follows for the periods presented (in thousands):
|  | Assets |  | Liabilities
2022 |  | $ | 138,363 |  |  | $ | 5,482 |
2023 |  | 132,163 |  |  | 5,262 |
2024 |  | 63,179 |  |  | 3,117 |
2025 |  | 26,311 |  |  | 2,588 |
2026 |  | 22,718 |  |  | 2,077 |
Thereafter |  | 124,000 |  |  | 9,210 |
Total |  | $ | 506,734 |  |  | $ | 27,736 |

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- References No definition available. + Details
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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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