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Fair value measurements (Tables)
3 Months Ended
Mar. 31, 2024
Fair Value Disclosures [Abstract]  
Schedule of assets and liabilities measured at fair value on a recurring basis
The following table sets forth the assets that we measure at fair value on a recurring basis by level in the fair value hierarchy (in thousands). There were no liabilities measured at fair value on a recurring basis as of March 31, 2024 and December 31, 2023. There were no transfers of assets measured at fair value on a recurring basis to or from Level 3 in the fair value hierarchy during the three months ended March 31, 2024.
Fair Value Measurement Using
Description TotalQuoted Prices in
Active Markets
for Identical Assets
(Level 1)
Significant
Other
Observable Inputs
(Level 2)
Significant
Unobservable
Inputs
(Level 3)
Investments in publicly traded companies:
As of March 31, 2024$174,521 $174,521 $— $— 
As of December 31, 2023$159,566 $159,566 $— $— 
Schedule of assets and liabilities measure at fair value on a nonrecurring basis
The following table sets forth the assets measured at fair value on a nonrecurring basis by level within the fair value hierarchy as of March 31, 2024 and December 31, 2023 (in thousands).
Fair Value Measurement Using
Description Carrying AmountQuoted Prices in
Active Markets
for Identical Assets
(Level 1)
Significant
Other
Observable Inputs
(Level 2)
Significant
Unobservable
Inputs
(Level 3)
Real estate assets held for sale with carrying values adjusted to fair value less costs to sell
As of March 31, 2024$118,530 (1)$— $— $118,530 (2)
As of December 31, 2023$133,885 (1)$— $— $133,885 (2)
Investments in privately held entities that do not report NAV
As of March 31, 2024$182,596 $— $166,688 (3)$15,908 (4)
As of December 31, 2023$188,689 $— $174,268 (3)$14,421 (4)

(1)These amounts are included in the total balances of our net assets classified as held for sale aggregating $179.3 million and $191.4 million as of March 31, 2024 and December 31, 2023, respectively, disclosed in Note 15 – “Assets classified as held for sale,” and represent assets held for sale as of March 31, 2024 and December 31, 2023, respectively, for which impairments were recognized. Refer to Note 3 – “Investments in real estate” and Note 15 – “Assets classified as held for sale” to our consolidated financial statements for additional information.
(2)Represent aggregate carrying amounts of assets held for sale after adjustments to their respective fair values less costs to sell based on executed purchase and sale agreements, letters of intent, or valuations provided by third-party real estate brokers.
(3)These amounts represent the total carrying amounts of our equity investments in privately held entities with observable price changes, which are included in the investments balances of $1.5 billion and $1.4 billion, respectively, in our unaudited consolidated balance sheets as of March 31, 2024 and December 31, 2023, respectively, disclosed in Note 7 – “Investments” to our unaudited consolidated financial statements.
(4)These amounts are included in the investments in privately held entities without observable price changes balances aggregating $382.4 million and $368.7 million as of March 31, 2024 and December 31, 2023, respectively, disclosed in Note 7 – “Investments” to our unaudited consolidated financial statements. The aforementioned balances represent the carrying amounts of investments in privately held entities that do not report NAV for which impairments have been recognized in accordance with the measurement alternative guidance described in “Investments” in Note 2 – “Summary of significant accounting policies” to our unaudited consolidated financial statements.
As of March 31, 2024 and December 31, 2023, the book and estimated fair values of our secured notes payable and unsecured senior notes payable and the amounts outstanding under our unsecured senior line of credit and commercial paper program, including the level within the fair value hierarchy for which the estimates were derived, were as follows (in thousands):
March 31, 2024
Book ValueFair Value HierarchyEstimated Fair Value
Quoted Prices in
Active Markets
for Identical Assets
(Level 1)
Significant
Other
Observable Inputs
(Level 2)
Significant
Unobservable
Inputs
(Level 3)
Liabilities:
Secured notes payable$130,050 $— $129,619 $— $129,619 
Unsecured senior notes payable$12,087,113 $— $10,509,910 $— $10,509,910 
Unsecured senior line of credit
$— $— $— $— $— 
Commercial paper program$— $— $— $— $— 

December 31, 2023
Book ValueFair Value HierarchyEstimated Fair Value
Quoted Prices in
Active Markets
for Identical Assets
(Level 1)
Significant
Other
Observable Inputs
(Level 2)
Significant
Unobservable
Inputs
(Level 3)
Liabilities:
Secured notes payable$119,662 $— $118,660 $— $118,660 
Unsecured senior notes payable$11,096,028 $— $9,708,930 $— $9,708,930 
Unsecured senior line of credit
$— $— $— $— $— 
Commercial paper program$99,952 $— $99,915 $— $99,915