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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 10-Q 
QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the Quarterly Period Ended March 31, 2024
TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the transition period from             to            
Commission File Number: 001-36106
EMPIRE STATE REALTY OP, L.P.
(Exact name of Registrant as specified in its charter)  
Delaware
 45-4685158
(State or other jurisdiction of incorporation or organization) (I.R.S. Employer Identification No.)

111 West 33rd Street, 12th Floor
New York, New York 10120
(Address of principal executive offices) (Zip Code)
(212) 687-8700
(Registrant's telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Act:
    
Title of each classTrading SymbolName of each exchange on which registered
Series ES operating partnership unitsESBANYSE Arca, Inc.
Series 60 operating partnership unitsOGCPNYSE Arca, Inc.
Series 250 operating partnership unitsFISKNYSE Arca, Inc.
Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.                    Yes       No 
Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).                                         Yes       No 
Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See definition of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and "emerging growth company" in Rule 12b-2 of the Exchange Act.
Large accelerated filerAccelerated filer 
Non-accelerated filer Smaller reporting company 
Emerging growth company

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.
Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).   Yes    No  
As of May 2, 2024, there were 19,312,499 units of the Registrant Series ES operating partnership units outstanding, 4,973,023 units of the Series 60 operating partnership units outstanding, and 2,560,171 units of the Series 250 operating partnership units outstanding.



EMPIRE STATE REALTY OP, L.P.
FORM 10-Q FOR THE QUARTER ENDED MARCH 31, 2024
TABLE OF CONTENTSPAGE
PART 1.FINANCIAL INFORMATION
ITEM 1.FINANCIAL STATEMENTS
Condensed Consolidated Balance Sheets as of March 31, 2024 (unaudited) and December 31, 2023
Condensed Consolidated Statements of Operations for the three months ended March 31, 2024 and 2023 (unaudited)
Condensed Consolidated Statements of Comprehensive Income for the three months ended March 31, 2024 and 2023 (unaudited)
Condensed Consolidated Statements of Capital for the three months ended March 31, 2024 and 2023 (unaudited)
Condensed Consolidated Statements of Cash Flows for the three months ended March 31, 2024 and 2023 (unaudited)
Notes to Condensed Consolidated Financial Statements (unaudited)
ITEM 2.MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS
ITEM 3.QUANTITATIVE AND QUALITATIVE DISCLOSURE ABOUT MARKET RISK
ITEM 4.CONTROLS AND PROCEDURES
PART II.OTHER INFORMATION
ITEM 1.LEGAL PROCEEDINGS
ITEM 1A.RISK FACTORS
ITEM 2.UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS
ITEM 3.DEFAULTS UPON SENIOR SECURITIES
ITEM 4.MINE SAFETY DISCLOSURES
ITEM 5.OTHER INFORMATION
ITEM 6.EXHIBITS
SIGNATURES









1



ITEM 1. FINANCIAL STATEMENTS
Empire State Realty OP, L.P.
Condensed Consolidated Balance Sheets
(amounts in thousands, except per unit amounts)
March 31, 2024December 31, 2023
ASSETS(unaudited)
Commercial real estate properties, at cost:
Land$366,357 $366,357 
Development costs8,187 8,178 
Building and improvements3,327,773 3,280,657 
3,702,317 3,655,192 
Less: accumulated depreciation(1,288,519)(1,250,062)
Commercial real estate properties, net2,413,798 2,405,130 
Cash and cash equivalents333,573 346,620 
Restricted cash51,738 60,336 
Tenant and other receivables40,137 39,836 
Deferred rent receivables257,266 255,628 
Prepaid expenses and other assets74,472 98,167 
Deferred costs, net180,462 172,457 
Acquired below-market ground leases, net319,284 321,241 
Right of use assets28,378 28,439 
Goodwill491,479 491,479 
Total assets$4,190,587 $4,219,333 
LIABILITIES AND CAPITAL
Liabilities:
Mortgage notes payable, net$876,497 $877,388 
Senior unsecured notes, net973,926 973,872 
Unsecured term loan facilities, net268,503 389,286 
Unsecured revolving credit facility120,000  
Accounts payable and accrued expenses91,005 99,756 
Acquired below-market leases, net12,798 13,750 
Ground lease liabilities28,378 28,439 
Deferred revenue and other liabilities69,289 70,298 
Tenants’ security deposits25,457 35,499 
Total liabilities2,465,853 2,488,288 
Commitments and contingencies
Capital:
Private perpetual preferred units:
Private perpetual preferred units, $13.52 liquidation preference, 4,664 issued and outstanding in 2024 and 2023
21,936 21,936 
Private perpetual preferred units, $16.62 liquidation preference, 1,560 issued and outstanding in 2024 and 2023
8,004 8,004 
Series PR operating partnership units:
ESRT partner's capital (2,740 and 2,709 general partner operating partnership units and 162,058 and 160,337 limited partner operating partnership units outstanding in 2024 and 2023, respectively)
996,122 985,518 
Limited partners' interests (82,266 and 80,189 limited partner operating partnership units outstanding in 2024 and 2023, respectively)
692,575 694,512 
Series ES operating partnership units (19,387 and 19,947 limited partner operating partnership units outstanding in 2024 and 2023, respectively)
4,722 4,427 
Series 60 operating partnership units (4,991 and 5,144 limited partner operating partnership units outstanding in 2024 and 2023, respectively)
863 779 
Series 250 operating partnership units (2,573 and 2,619 limited partner operating partnership units outstanding in 2024 and 2023, respectively)
512 462 
Total Empire State Realty OP, L.P.'s capital1,724,734 1,715,638 
Non-controlling interest in other partnerships 15,407 
Total capital1,724,734 1,731,045 
 Total liabilities and capital$4,190,587 $4,219,333 
The accompanying notes are an integral part of these consolidated financial statements
2



Empire State Realty OP, L.P.
Condensed Consolidated Statements of Operations
(unaudited)
(amounts in thousands, except per unit amounts)
Three Months Ended March 31,
20242023
Revenues:
Rental revenue$153,882 $140,091 
Observatory revenue24,596 22,154 
Third-party management and other fees265 427 
Other revenue and fees2,436 1,950 
Total revenues181,179 164,622 
Operating expenses:
Property operating expenses45,060 42,044 
Ground rent expenses2,331 2,331 
General and administrative expenses15,972 15,708 
Observatory expenses8,431 7,855 
Real estate taxes32,241 31,788 
Depreciation and amortization46,081 47,408 
Total operating expenses150,116 147,134 
Total operating income
31,063 17,488 
Other income (expense):
Interest income4,178 2,595 
Interest expense(25,128)(25,304)
Loss on early extinguishment of debt(553) 
Gain on disposition of property 15,696 
Income before income taxes9,560 10,475 
Income tax benefit655 1,219 
Net income10,215 11,694 
Private perpetual preferred unit distributions(1,050)(1,050)
Net (income) loss attributable to non-controlling interests in other partnerships(4)43 
Net income attributable to common unitholders$9,161 $10,687 
Total weighted average units:
Basic264,562 264,493 
Diluted267,494 265,197 
Earnings per unit attributable to common unitholders:
Basic $0.03 $0.04 
Diluted $0.03 $0.04 
 
Dividends per unit$0.035 $0.035 

The accompanying notes are an integral part of these consolidated financial statements

3


Empire State Realty OP, L.P.
Condensed Consolidated Statements of Comprehensive Income
(unaudited)
(amounts in thousands)

Three Months Ended March 31,
20242023
Net income$10,215 $11,694 
Other comprehensive income (loss):
Unrealized gain (loss) on valuation of interest rate swap agreements8,198 (5,402)
Amount reclassified into interest expense(2,324)(1,272)
     Other comprehensive income (loss)5,874 (6,674)
Comprehensive income16,089 5,020 
Net (income) loss attributable to non-controlling interests in other partnerships(4)43 
Other comprehensive loss attributable to non-controlling interest in other partnerships 381 
Comprehensive income attributable to OP unitholders$16,085 $5,444 

The accompanying notes are an integral part of these consolidated financial statements

4


Empire State Realty OP, L.P.
Condensed Consolidated Statements of Capital
For The Three Months Ended March 31, 2024 and 2023
(unaudited)
(amounts in thousands)
Series PR Operating Partnership UnitsSeries ES Operating Partnership Units Limited PartnersSeries 60 Operating Partnership Units Limited PartnersSeries 250 Operating Partnership Units Limited Partners
General PartnerLimited Partners
Private Perpetual Preferred UnitsPrivate Perpetual Preferred UnitholdersOperating Partnership UnitsOperating Partnership UnitholdersOperating Partnership UnitsOperating Partnership UnitholdersOperating Partnership UnitsOperating Partnership UnitholdersOperating Partnership UnitsOperating Partnership UnitholdersOperating Partnership UnitsOperating Partnership UnitholdersNon-controlling Interest in Other PartnershipsTotal Capital
Balance at December 31, 20236,224 29,940 163,046 985,518 80,189 694,512 19,947 4,427 5,144 779 2,619 462 15,407 $1,731,045 
Conversion of operating partnership units to ESRT Partner's Capital— — 1,566 7,132 (807)(6,981)(560)(121)(153)(22)(46)(8)—  
Repurchases of common units— —   — — — — — — — — —  
Acquisition of non-controlling interests in other partnerships— — — 114 — — — — — — — — (15,411)(15,297)
Equity compensation— — 186 (260)2,884 3,709 — — — — — — — 3,449 
Distributions— (1,050)— (5,765)— (2,793)— (679)— (175)— (90)— (10,552)
Net income— 1,050 — 5,661 — 2,556 — 678 — 174 — 92 4 10,215 
Other comprehensive income— — — 3,722 — 1,572 — 417 — 107 — 56  5,874 
Balance at March 31, 20246,224 $29,940 164,798 $996,122 82,266 $692,575 19,387 $4,722 4,991 $863 2,573 $512 $ $1,724,734 
Series PR Operating Partnership UnitsSeries ES Operating Partnership Units Limited PartnersSeries 60 Operating Partnership Units Limited PartnersSeries 250 Operating Partnership Units Limited Partners
General PartnerLimited Partners
Private Perpetual Preferred UnitsPrivate Perpetual Preferred UnitholdersOperating Partnership UnitsOperating Partnership UnitholdersOperating Partnership UnitsOperating Partnership UnitholdersOperating Partnership UnitsOperating Partnership UnitholdersOperating Partnership UnitsOperating Partnership UnitholdersOperating Partnership UnitsOperating Partnership UnitholdersNon-controlling Interest in Other PartnershipsTotal Capital
Balance at December 31, 20226,224 $29,940 161,129 $954,375 80,475 $681,827 21,081 $1,391 5,558 $16 2,789 $76 $15,466 $1,683,091 
Conversion of operating partnership units to ESRT Partner's Capital
— — 806 2,544 (282)(2,433)(397)(89)(55)(9)(72)(13)—  
Repurchases of common shares— — (933)(5,694)— — — — — — — — — (5,694)
Contributions from consolidated joint ventures— — — — — — — — — — — — 18 18 
Equity compensation— — 327 21 1,519 4,353 — — — — — — — 4,374 
Distributions— (1,050)— (5,675)— (2,006)— (724)— (193)— (95)— (9,743)
Net income— 1,050 — 6,519 — 2,993 — 844 — 224 — 107 (43)11,694 
Other comprehensive income (loss)(3,839)(1,762)(497)(132)(63)(381)(6,674)
Balance at March 31, 20236,224 $29,940 161,329 $948,251 81,712 $682,972 20,684 $925 5,503 $(94)2,717 $12 $15,060 $1,677,066 

The accompanying notes are an integral part of these consolidated financial statements

5



Empire State Realty OP, L.P.
Condensed Consolidated Statements of Cash Flows
(unaudited)
(amounts in thousands)
Three Months Ended March 31,
20242023
Cash Flows From Operating Activities
Net income$10,215 $11,694 
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization46,081 47,408 
Gain on disposition of property (15,696)
Amortization of non-cash items within interest expense2,076 2,238 
Amortization of acquired above- and below-market leases, net(514)(703)
Amortization of acquired below-market ground leases1,958 1,958 
Straight-lining of rental revenue(3,061)(556)
Equity based compensation3,449 4,374 
Loss on early extinguishment of debt553  
Increase (decrease) in cash flows due to changes in operating assets and liabilities:
Security deposits(10,042)10,184 
Tenant and other receivables(1,371)258 
Deferred leasing costs(8,105)(4,498)
Prepaid expenses and other assets29,132 34,915 
Accounts payable and accrued expenses141 (6,804)
Deferred revenue and other liabilities414 1,591 
Net cash provided by operating activities70,926 86,363 
Cash Flows From Investing Activities
Acquisition of non-controlling interests in other partnerships(14,226) 
Net proceeds from disposition of property 39,137 
Post-closing costs from a prior period sale of property (4,034) 
Development costs(9)(12)
Additions to building and improvements(53,000)(41,756)
Net cash used in investing activities(71,269)(2,631)

The accompanying notes are an integral part of these consolidated financial statements

















6






Empire State Realty OP, L.P.
Condensed Consolidated Statements of Cash Flows (continued)
(unaudited)
(amounts in thousands)

Three Months Ended March 31,
20242023
Cash Flows From Financing Activities
Repayment of mortgage notes payable(1,470)(2,142)
Proceeds from unsecured term loan95,000  
Repayment of unsecured term loan(215,000) 
Proceeds from unsecured revolving credit facility120,000  
Deferred financing costs(9,280) 
Repurchases of common units (5,694)
Distributions(10,552)(9,743)
Net cash used in financing activities(21,302)(17,579)
Net increase (decrease) in cash and cash equivalents and restricted cash(21,645)66,153 
Cash and cash equivalents and restricted cash—beginning of period406,956 314,678 
Cash and cash equivalents and restricted cash—end of period$385,311 $380,831 
Reconciliation of Cash and Cash Equivalents and Restricted Cash:
Cash and cash equivalents at beginning of period$346,620 $264,434 
Restricted cash at beginning of period60,336 50,244 
Cash and cash equivalents and restricted cash at beginning of period$406,956 $314,678 
Cash and cash equivalents at end of period$333,573 $272,648 
Restricted cash at end of period51,738 108,183 
Cash and cash equivalents and restricted cash at end of period$385,311 $380,831 
Supplemental disclosures of cash flow information:
Cash paid for interest$21,984 $23,006 
Cash paid for income taxes$480 $283 
Non-cash investing and financing activities:
Building and improvements included in accounts payable and accrued expenses$48,771 $39,982 
Write-off of fully depreciated assets551 847 
Derivative instruments at fair values included in prepaid expenses and other assets16,726 12,446 
Derivative instruments at fair values included in accounts payable and accrued expenses 2,171 
Conversion of operating partnership units to ESRT partner's capital7,132 2,544 

The accompanying notes are an integral part of these consolidated financial statements
7




Empire State Realty OP, L.P.
Notes to Condensed Consolidated Financial Statements
(unaudited)
1. Description of Business and Organization
As used in these condensed consolidated financial statements, unless the context otherwise requires, “we,” “us,” “our,” and the “Company,” mean Empire State Realty OP, L.P. and its consolidated subsidiaries.
Empire State Realty OP, L.P. (the "Operating Partnership") is the entity through which Empire State Realty Trust, Inc. (NYSE: ESRT), a NYC-focused REIT that owns and operates a portfolio of modernized, amenitized, and well-located office, retail, and multifamily assets, and the Observatory deck attraction in ESRT’s flagship Empire State Building – the “World’s Most Famous Building”, conducts all of its business and owns (either directly or through subsidiaries) substantially all of its assets. The Company is a recognized leader in energy efficiency and indoor environmental quality.
As of March 31, 2024, ESRT’s portfolio was comprised of approximately 8.6 million rentable square feet of office space, 0.7 million rentable square feet of retail space and 727 residential units. Our office portfolio included 11 properties (including three long-term ground leasehold interests) encompassing approximately 8.6 million rentable square feet. Nine of these office properties are located in midtown Manhattan and encompass approximately 7.6 million rentable square feet, including the Empire State Building. The remaining two office properties encompass approximately 1.1 million rentable square feet and are located in Stamford, Connecticut, with immediate access to mass transportation. Additionally, we have entitled land adjacent to one of the Stamford office properties that can support the development of either office or residential per local zoning. Our multifamily portfolio included 727 residential units in New York City.
We were organized as a Delaware limited partnership on November 28, 2011, and commenced operations upon completion of the initial public offering of ESRT’s Class A common stock and related formation transactions on October 7, 2013 (the "IPO"). ESRT's Class A common stock, par value $0.01 per share, is listed on the New York Stock Exchange under the symbol "ESRT." ESRT, as the sole general partner in our Company, has responsibility and discretion in the management and control of our Company, and our limited partners, in such capacity, have no authority to transact business for, or participate in the management activities, of our Company. As of March 31, 2024, ESRT owned approximately 60.1% of our operating partnership units.
2. Summary of Significant Accounting Policies
There have been no material changes to the summary of significant accounting policies included in the "Summary of Significant Accounting Policies" section in our Annual Report on Form 10-K for the year ended December 31, 2023 (the “Annual Report”).
Basis of Quarterly Presentation and Principles of Consolidation
The accompanying unaudited condensed consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America ("GAAP"), for interim financial information, and with the rules and regulations of the Securities and Exchange Commission (the "SEC"). Accordingly, certain information and footnote disclosures required by GAAP for complete financial statements have been condensed or omitted in accordance with such rules and regulations. In the opinion of management, all adjustments and eliminations (including intercompany balances and transactions), consisting of normal recurring adjustments, considered necessary for the fair presentation of the financial statements have been included.
The results of operations for the periods presented are not necessarily indicative of the results that may be expected for the corresponding full years. These financial statements should be read in conjunction with the financial statements and accompanying notes included in the financial statements for the year ended December 31, 2023 contained in our Annual Report. Our Observatory business is subject to tourism trends and the weather, and therefore does experience some seasonality. For the year ended December 31, 2023, approximately 17% of our annual Observatory revenue was realized in the first quarter, 26% was realized in the second quarter, 29% was realized in the third quarter, and 28% was realized in the fourth quarter. Our multifamily business experiences some seasonality based on general market trends in New York City – the winter months (November through January) are slower in terms of lease activity. We seek to mitigate this by staggering lease terms such that
8


lease expirations are matched with seasonal demand. We do not consider the balance of our business to be subject to material seasonal fluctuations.
We consolidate entities in which we have a controlling financial interest. In determining whether we have a controlling financial interest in a partially owned entity and the requirement to consolidate the accounts of that entity, we consider factors such as ownership interest, board representation, management representation, authority to make decisions, and contractual and substantive participating rights of the partners/members. For variable interest entities ("VIE"), we consolidate the entity if we are deemed to have a variable interest in the entity and through that interest we are deemed the primary beneficiary. The primary beneficiary of a VIE is the entity that has (i) the power to direct the activities that most significantly impact the entity's economic performance and (ii) the obligation to absorb losses of the VIE or the right to receive benefits from the VIE that could be significant to the VIE. The primary beneficiary is required to consolidate the VIE. We had no VIEs as of March 31, 2024 and December 31, 2023.
We will assess the accounting treatment for each investment we may have in the future. This assessment will include a review of each entity’s organizational agreement to determine which party has what rights and whether those rights are protective or participating. For all VIEs, we will review such agreements in order to determine which party has the power to direct the activities that most significantly impact the entity’s economic performance and benefit. In situations where we or our partner could approve, among other things, the annual budget, or leases that cover more than a nominal amount of space relative to the total rentable space at each property, we would not consolidate the investment as we consider these to be substantive participation rights that result in shared power of the activities that would most significantly impact the performance and benefit of such joint venture investment.
A non-controlling interest in a consolidated subsidiary is defined as the portion of the equity (net assets) in a subsidiary not attributable, directly or indirectly, to a parent. Non-controlling interests are required to be presented as a separate component of equity in the condensed consolidated balance sheets and in the condensed consolidated statements of operations by requiring earnings and other comprehensive income to be attributed to controlling and non-controlling interests.
Accounting Estimates
The preparation of the condensed consolidated financial statements in accordance with GAAP requires management to use estimates and assumptions that in certain circumstances affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities, and the reported revenues and expenses. Significant items subject to such estimates and assumptions include allocation of the purchase price of acquired real estate properties among tangible and intangible assets, determination of the useful life of real estate properties and other long-lived assets, valuation and impairment analysis of commercial real estate properties, goodwill, right-of-use assets and other long-lived and indefinite-lived assets, estimate of tenant expense reimbursements, valuation of the allowance for doubtful accounts, and valuation of derivative instruments, ground lease liabilities, senior unsecured notes, mortgage notes payable, unsecured revolving credit and term loan facilities, and equity-based compensation. These estimates are prepared using management’s best judgment, after considering past, current, and expected events and economic conditions. Actual results could differ from those estimates.
3. Acquisitions and Dispositions
Property Acquisitions
In September 2023, we closed on the acquisition of a retail property in Williamsburg, Brooklyn, located on the corner of North 6th Street and Wythe Avenue for a purchase price of $26.4 million. The property has three retail tenants and six residential units and was fully leased as of March 31, 2024. The purchase price is the fair value at the date of acquisition.
The following table summarizes properties acquired during the three and twelve months ended March 31, 2024 and December 31, 2023, respectively (amounts in thousands):
Intangibles
PropertyDate AcquiredLandBuilding and ImprovementsAssetsLiabilitiesTotal*
Williamsburg Retail, Brooklyn9/14/2023$4,851 $20,936 $1,573 $(300)$27,060 
*Includes total capitalized transaction costs of $0.7 million.
In March 2024, we executed a buyout of our partner's 10% interest in two of our multifamily properties located at 561 10th Avenue and 345 East 94th Street in Manhattan for $14.2 million in cash and the assumption of $18.0 million of in-place
9


debt. As of March 31, 2024, we own 100% of the interests in these assets. As there was no change in control, we accounted for this acquisition as an equity transaction in accordance with Accounting Standards Codification 810-10 and no gain or loss was recognized.
Property Dispositions
The following table summarizes properties disposed of during the three and twelve months ended March 31, 2024 and December 31, 2023, respectively (amounts in thousands):
PropertyDate of DisposalSales PriceGain on Disposition
500 Mamaroneck Avenue, Harrison, New York*4/5/2023$53,000 $11,075 
69-97 and 103-107 Main Street, Westport, Connecticut2/1/2023$40,000 $15,689 
*The gain is net of approximately $4.5 million of post-closing costs we accrued related to our commitment to reimburse the buyer for a lease that did not occur. We funded the buyer for these costs and we have no further obligations or contingencies related to this property.
4. Deferred Costs, Acquired Lease Intangibles and Goodwill
Deferred costs, net, consisted of the following as of March 31, 2024 and December 31, 2023 (amounts in thousands):
March 31, 2024December 31, 2023
Leasing costs$230,108 $224,295 
Acquired in-place lease value and deferred leasing costs146,533 158,267 
Acquired above-market leases22,064 23,918 
398,705 406,480 
Less: accumulated amortization(228,482)(236,900)
Total deferred costs, net, excluding net deferred financing costs$170,223 $169,580 
At March 31, 2024 and December 31, 2023, $10.2 million and $2.9 million, respectively, of net deferred financing costs associated with the unsecured revolving credit facility was included in deferred costs, net on the condensed consolidated balance sheets.
Amortization expense related to deferred leasing costs and acquired deferred leasing costs was $5.8 million and $5.8 million for the three months ended March 31, 2024 and 2023, respectively. Amortization expense related to acquired lease intangibles was $1.3 million and $2.4 million for the three months ended March 31, 2024 and 2023, respectively.
Amortizing acquired intangible assets and liabilities consisted of the following as of March 31, 2024 and December 31, 2023 (amounts in thousands):
March 31, 2024December 31, 2023
Acquired below-market ground leases$396,916 $396,916 
Less: accumulated amortization(77,632)(75,675)
Acquired below-market ground leases, net$319,284 $321,241 
March 31, 2024December 31, 2023
Acquired below-market leases$(51,927)$(55,155)
Less: accumulated amortization39,129 41,405 
Acquired below-market leases, net$(12,798)$(13,750)
Rental revenue related to the amortization of below-market leases, net of above-market leases, was $0.5 million and $0.7 million for the three months ended March 31, 2024 and 2023, respectively.
As of March 31, 2024 and December 31, 2023, we had goodwill of $491.5 million. Goodwill was allocated $227.5 million to the Observatory reportable segment and $264.0 million to the real estate reportable segment.
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We performed our annual goodwill testing in October 2023, where we bypassed the optional qualitative goodwill impairment assessment and proceeded directly to a quantitative assessment of the Observatory reportable segment and engaged a third-party valuation consulting firm to perform the valuation process. The quantitative analysis used a combination of the discounted cash flow method (a form of the income approach) utilizing Level 3 unobservable inputs and the guideline company method (a form of the market approach). Significant assumptions under the former included revenue and cost projections, weighted average cost of capital, long-term growth rate and income tax considerations while the latter included guideline company enterprise values, revenue multiples, EBITDA multiples and control premium rates. Our methodology to review goodwill impairment, which included a significant amount of judgment and estimates, provided a reasonable basis to determine whether impairment had occurred. The quantitative analysis performed concluded the fair value of the reporting unit exceeds its carrying value. We also perform quarterly qualitative assessments and have not identified any events which would indicate, on a more likely than not basis, that the goodwill allocated to the reporting unit was impaired. Many of the factors employed in determining whether or not goodwill is impaired are outside of our control, and it is reasonably likely that assumptions and estimates will change in future periods. We will continue to assess the impairment of the Observatory reporting unit goodwill going forward.
5. Debt
Debt consisted of the following as of March 31, 2024 and December 31, 2023 (amounts in thousands):
Principal BalanceAs of March 31, 2024
March 31, 2024December 31, 2023Stated
Rate
Effective
Rate
(1)
Maturity
Date
(2)
Fixed rate mortgage debt
Metro Center$79,425 $80,070 3.59 %3.67 %11/5/2024
10 Union Square50,000 50,000 3.70 %3.97 %4/1/2026
1542 Third Avenue30,000 30,000 4.29 %4.53 %5/1/2027
First Stamford Place(3)
175,860 175,860 4.28 %4.73 %7/1/2027
1010 Third Avenue and 77 West 55th Street34,734 34,958 4.01 %4.21 %1/5/2028
250 West 57th Street180,000 180,000 2.83 %3.21 %12/1/2030
1333 Broadway160,000 160,000 4.21 %4.29 %2/5/2033
345 East 94th Street - Series A43,600 43,600 
70% of SOFR plus 0.95%
3.56 %11/1/2030
345 East 94th Street - Series B7,035 7,209 
SOFR plus 2.24%
3.56 %11/1/2030
561 10th Avenue - Series A114,500 114,500 
70% of SOFR plus 1.07%
3.85 %11/1/2033
561 10th Avenue - Series B15,375 15,801 
SOFR plus 2.45%
3.85 %11/1/2033
Total mortgage debt890,529 891,998 
Senior unsecured notes:(4)
   Series A100,000 100,000 3.93 %3.96 %3/27/2025
   Series B125,000 125,000 4.09 %4.12 %3/27/2027
   Series C125,000 125,000 4.18 %4.21 %3/27/2030
   Series D115,000 115,000 4.08 %4.11 %1/22/2028
   Series E160,000 160,000 4.26 %4.27 %3/22/2030
   Series F175,000 175,000 4.44 %4.45 %3/22/2033
   Series G100,000 100,000 3.61 %4.89 %3/17/2032
   Series H75,000 75,000 3.73 %5.00 %3/17/2035
Unsecured term loan facility (4)
175,000 175,000 
SOFR plus 1.50%
4.51 %12/31/2026
Unsecured term loan facility (4)
95,000 215,000 
 SOFR plus 1.50%
4.47 %3/8/2029
Unsecured revolving credit facility (4)
120,000  
SOFR plus 1.30%
4.03 %3/8/2029
Total principal2,255,529 2,256,998 
Deferred financing costs, net(9,834)(9,488)
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Unamortized debt discount(6,769)(6,964)
Total$2,238,926 $2,240,546 
______________
(1)The effective rate is the yield as of March 31, 2024 and includes the stated interest rate, deferred financing cost amortization and interest associated with variable to fixed interest rate swap agreements.
(2)Pre-payment is generally allowed for each loan upon payment of a customary pre-payment penalty.
(3)Represents a $164 million mortgage loan bearing interest at 4.09% and a $11.9 million loan bearing interest at 6.25%. In April 2024, we worked with the First Stamford Place mortgage lender to structure a cooperative consensual foreclosure, which is anticipated to be completed by June 30, 2024. Upon completion, this transaction is expected to eliminate a $175.9 million liability that matures in July 2027 from the balance sheet.
(4)At March 31, 2024, we were in compliance with all debt covenants.
Principal Payments
Aggregate required principal payments at March 31, 2024 are as follows (amounts in thousands):
YearAmortizationMaturitiesTotal
2024$7,392 $77,675 $85,067 
20256,893 100,000 106,893 
20267,330 225,000 232,330 
20276,461 319,000 325,461 
20283,556 146,092 149,648 
Thereafter18,523 1,337,607 1,356,130 
Total$50,155 $2,205,374 $2,255,529 
Deferred Financing Costs
Deferred financing costs, net, consisted of the following at March 31, 2024 and December 31, 2023 (amounts in thousands):
 March 31, 2024December 31, 2023
Financing costs$52,200 $43,473 
Less: accumulated amortization(32,128)(31,108)
Total deferred financing costs, net$20,072 $12,365 
Amortization expense related to deferred financing costs was $1.0 million and $1.1 million for the three months ended March 31, 2024 and 2023, respectively.
Unsecured Revolving Credit and Term Loan Facilities
On March 8, 2024, through our Operating Partnership, we entered into a second amended and restated credit agreement with Bank of America, N.A., as administrative agent and the other lenders party thereto, that amends and restates the amended and restated credit agreement, dated August 29, 2017 which governs our senior unsecured revolving credit facility and term loan facility (collectively, the “BofA Credit Facilities”). The BofA Credit Facilities are comprised of a $620 million senior unsecured revolving credit facility (the “Revolving Credit Facility”) and a $95 million term loan facility (the “BofA Term Loan Facility”). We may request that the BofA Credit Facilities be increased through one or more increases in the Revolving Credit Facility or one or more increases in the BofA Term Loan Facility or the addition of new pari passu term loan tranches, for a maximum aggregate principal amount under the second amended and restated credit agreement not to exceed $1.5 billion.
The new Revolving Credit Facility matures on March 8, 2029, inclusive of two six-month extension periods and replaced the existing revolving credit facility that was due to mature in March 2025. The new BofA Term Loan Facility matures on March 8, 2029, inclusive of two twelve-month extension periods and replaced the existing term loan facility that was due to mature in March 2025. Initial interest rates on the new BofA Credit Facilities, which may change based on our leverage levels, are SOFR plus a benchmark adjustment of 10.0 basis points ("adjusted SOFR") plus 130 basis points for any drawn portion of the Revolving Credit Facility and adjusted SOFR plus 150 basis points for the BofA Term Loan Facility. In addition, the BofA Credit Facilities have a sustainability-linked pricing mechanism that reduces the borrowing spread if certain benchmarks are
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achieved each year. As of March 31, 2024, we had $120.0 million borrowings drawn on the Revolving Credit Facility and $95.0 million under the BofA Term Loan Facility.
On March 13, 2024, through our Operating Partnership, we entered into a third amendment to our credit agreement dated March 19, 2020 with Wells Fargo Bank, National Association, as administrative agent, and the other lenders party thereto, which governs a senior unsecured term loan facility (the “Wells Term Loan Facility”). The Wells Term Loan Facility is in the original principal amount of $175.0 million and matures on December 31, 2026. The third amendment provides for, among other things, certain conforming changes to the BofA Credit Facilities agreement, including increases to the capitalization rate for certain of our properties. No other changes were made to the amount of the commitments, the maturity date of the outstanding loans or the covenants. We may request the Wells Term Loan Facility be increased through one or more increases or the addition of new pari passu term loan tranches, for a maximum aggregate principal amount not to exceed $225 million. As of March 31, 2024, our borrowings amounted to $175.0 million under the Wells Term Loan Facility.
The terms of both the BofA Credit Facilities and the Wells Term Loan Facility include customary covenants, including limitations on liens, investment, distributions, debt, fundamental changes, and transactions with affiliates and require certain customary financial reports. Both facilities also require compliance with financial ratios including a maximum leverage ratio, a maximum secured leverage ratio, a minimum fixed charge coverage ratio, a minimum unencumbered interest coverage ratio, and a maximum unsecured leverage ratio. The agreements governing both facilities also contain customary events of default (subject in certain cases to specified cure periods), including but not limited to non-payment, breach of covenants, representations or warranties, cross defaults, bankruptcy or other insolvency events, judgments, ERISA events, invalidity of loan documents, loss of real estate investment trust qualification, and occurrence of a change of control. As of March 31, 2024, we were in compliance with these covenants.
Senior Unsecured Notes
The terms of the senior unsecured notes include customary covenants, including limitations on liens, investment, distributions, debt, fundamental changes, and transactions with affiliates and require certain customary financial reports. The terms also require compliance with financial ratios including a maximum leverage ratio, a maximum secured leverage ratio, a minimum fixed charge coverage ratio, a minimum unencumbered interest coverage ratio, and a maximum unsecured leverage ratio. The agreements also contain customary events of default (subject in certain cases to specified cure periods), including but not limited to non-payment, breach of covenants, representations or warranties, cross defaults, bankruptcy or other insolvency events, judgments, ERISA events, the occurrence of certain change of control transactions and loss of real estate investment trust qualification. As of March 31, 2024, we were in compliance with these covenants.
On April 10, 2024, we entered into a Note Purchase Agreement with the purchasers named therein (the “Purchase Agreement”) in connection with a private placement of our Series I-K green guaranteed senior unsecured notes (the “Notes”). Under the Purchase Agreement, we will issue and sell $225 million aggregate principal amount of Notes, consisting of (a) $155 million aggregate principal amount of 7.20% Series I Green Guaranteed Senior Notes due June 17, 2029, (b) $45 million aggregate principal amount of 7.32% Series J Green Guaranteed Senior Notes due June 17, 2031 and (c) $25 million aggregate principal amount of 7.41% Series K Green Guaranteed Senior Notes due June 17, 2034. The sale and purchase of the Notes is scheduled to be held on June 17, 2024, subject to customary closing conditions. The issue price for the Notes is 100% of the aggregate principal amount thereof. Pursuant to the terms of the Purchase Agreement, we may prepay all or a portion of the Notes upon notice to the holders at a price equal to 100% of the principal amount so prepaid plus a make-whole premium as set forth in the Purchase Agreement. The Purchase Agreement contains customary covenants and customary events of default similar to those in our Series A-H senior unsecured notes.

6. Accounts Payable and Accrued Expenses
    Accounts payable and accrued expenses consisted of the following as of March 31, 2024 and December 31, 2023 (amounts in thousands):
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March 31, 2024December 31, 2023
Accrued capital expenditures$48,771 $51,815 
Accounts payable and accrued expenses37,674 44,169 
Interest rate swap agreements liability 85 
Accrued interest payable4,560 3,687 
     Total accounts payable and accrued expenses$91,005 $99,756 
7. Financial Instruments and Fair Values
Derivative Financial Instruments
We use derivative financial instruments primarily to manage interest rate risk and such derivatives are not considered speculative. These derivative instruments are typically in the form of interest rate swap and forward agreements, and the primary objective is to minimize interest rate risks associated with investing and financing activities. The counterparties of these arrangements are major financial institutions with which we may also have other financial relationships. We are exposed to credit risk in the event of non-performance by these counterparties; however, we currently do not anticipate that any of the counterparties will fail to meet their obligations.
We have agreements with our derivative counterparties that contain a provision where if we either default or are capable of being declared in default on any of our indebtedness, then we could also be declared in default on our derivative obligations. As of March 31, 2024, we did not have derivatives in a net liability position.
As of March 31, 2024 and December 31, 2023, we had interest rate swaps and caps with an aggregate notional value of $586.3 million and $573.2 million, respectively. The notional value does not represent exposure to credit, interest rate or market risks. As of March 31, 2024, the fair value of our derivative instruments in an asset position amounted to $16.7 million, which is included in prepaid expenses and other assets on the condensed consolidated balance sheet. As of December 31, 2023, the fair value of our derivative instruments amounted to $11.8 million which is included in prepaid expenses and other assets, and ($0.1 million) which is included in accounts payable and accrued expenses on the condensed consolidated balance sheet. These interest rate swaps have been designated as cash flow hedges and hedge the variability in future cash flows associated with our existing variable-rate term loan facilities. Interest rate caps not designated as hedges are not speculative and are used to manage our exposure to interest rate movements, but do not meet the strict hedge accounting requirements.
As of March 31, 2024 and 2023, our cash flow hedges are deemed highly effective and a net unrealized gain (loss) of $5.9 million and $(6.7) million for the three months ended March 31, 2024 and 2023, respectively, relating to both active and terminated hedges of interest rate risk, are reflected in the condensed consolidated statements of comprehensive income. Amounts reported in accumulated other comprehensive loss related to derivatives will be reclassified to interest expense as interest payments are made on the debt. We estimate that $6.8 million net gain of the current balance held in accumulated other comprehensive income (loss) will be reclassified into interest expense within the next 12 months.
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The table below summarizes the terms of agreements and the fair values of our derivative financial instruments as of March 31, 2024 and December 31, 2023 (amounts in thousands):
March 31, 2024December 31, 2023
DerivativeNotional AmountReceive RatePay RateEffective DateExpiration DateAssetLiabilityAssetLiability
Interest rate swap$36,820 
70% of 1 Month SOFR
2.5000%December 1, 2021November 1, 2030$659 $ $64 $ 
Interest rate swap103,790 
70% of 1 Month SOFR
2.5000%December 1, 2021November 1, 20331,898   (85)
Interest rate swap10,710 
70% of 1 Month SOFR
1.7570%December 1, 2021November 1, 2033716  546  
Interest rate swap15,518 1 Month SOFR2.2540%December 1, 2021November 1, 2030951  782  
Interest rate cap6,780 
70% of 1 Month SOFR
4.5000%December 1, 2021October 1, 2024    
Interest rate cap9,188 1 Month SOFR5.5000%December 1, 2021October 1, 20242  4  
Interest rate swap175,000 SOFR Compound2.5620%August 31, 2022December 31, 20267,633  5,637  
Interest rate swap107,500 SOFR Compound2.6260%August 19, 2022March 19, 20252,364  2,384  
Interest rate swap107,500 SOFR OIS Compound2.6280%August 19, 2022March 19, 20252,363  2,383  
Interest rate cap6,780 
70% of 1 Month SOFR
4.5000%October 1, 2024November 1, 203044    
Interest rate cap6,676 1 Month SOFR5.5000%October 1, 2024November 1, 203096    
$16,726 $ $11,800 $(85)
The table below shows the effect of our derivative financial instruments designated as cash flow hedges on accumulated other comprehensive income (loss) for the three months ended March 31, 2024 and 2023 (amounts in thousands):
Three Months Ended
Effects of Cash Flow HedgesMarch 31, 2024March 31, 2023
Amount of gain (loss) recognized in other comprehensive income (loss)$8,198 $(5,402)
Amount of gain reclassified from accumulated other comprehensive income (loss) into interest expense2,324 1,272 
The table below shows the effect of our derivative financial instruments designated as cash flow hedges on the condensed consolidated statements of operations for the three months ended March 31, 2024 and 2023 (amounts in thousands):
Three Months Ended
Effects of Cash Flow HedgesMarch 31, 2024March 31, 2023
Total interest expense presented in the condensed consolidated statements of operations in which the effects of cash flow hedges are recorded$(25,128)$(25,304)
Amount of gain reclassified from accumulated other comprehensive income (loss) into interest expense2,324 1,272 
Fair Valuation
The estimated fair values at March 31, 2024 and December 31, 2023 were determined by management, using available market information and appropriate valuation methodologies. Considerable judgment is necessary to interpret market data and develop estimated fair value. Accordingly, the estimates presented herein are not necessarily indicative of the amounts we could realize on disposition of the financial instruments. The use of different market assumptions and/or estimation methodologies may have a material effect on the estimated fair value amounts.
The fair value of derivative instruments is determined using widely accepted valuation techniques, including discounted cash flow analysis on the expected cash flows of each derivative. Although the majority of the inputs used to value
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our derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with our derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by ourselves and our counterparties. The impact of such credit valuation adjustments, determined based on the fair value of each individual contract, was not significant to the overall valuation. As a result, all our derivatives were classified as Level 2 of the fair value hierarchy.
The fair values of our mortgage notes payable, senior unsecured notes (Series A, B, C, D, E, F, G and H), unsecured term loan facilities and unsecured revolving credit facility which are determined using Level 3 inputs are estimated by discounting the future cash flows using current interest rates at which similar borrowings could be made by us.
The following tables summarize the carrying and estimated fair values of our financial instruments as of March 31, 2024 and December 31, 2023 (amounts in thousands):
March 31, 2024
Estimated Fair Value
Carrying
Value
TotalLevel 1Level 2Level 3
Interest rate swaps and caps included in prepaid expenses and other assets$16,726 $16,726 $ $16,726 $ 
Mortgage notes payable876,497 765,660   765,660 
Senior unsecured notes - Series A, B, C, D, E, F, G and H973,926 872,714   872,714 
Unsecured term loan facilities268,503 270,000   270,000 
Unsecured revolving credit facility120,000 120,000   120,000 
December 31, 2023
Estimated Fair Value
Carrying
Value
TotalLevel 1Level 2Level 3
Interest rate swaps and caps included in prepaid expenses and other assets$11,800 $11,800 $ $11,800 $ 
Interest rate swaps included in accounts payable and accrued expenses85 85  85  
Mortgage notes payable877,388 774,280   774,280 
Senior unsecured notes - Series A, B, C, D, E, F, G and H973,872 882,242   882,242 
Unsecured term loan facilities389,286 390,000   390,000 
Disclosure about the fair value of financial instruments is based on pertinent information available to us as of March 31, 2024 and December 31, 2023. Although we are not aware of any factors that would significantly affect the reasonable fair value amounts, such amounts have not been comprehensively revalued for purposes of these financial statements since that date and current estimates of fair value may differ significantly from the amounts presented herein.
8. Leases
Lessor
We lease various spaces to tenants over terms ranging from one to 31 years. Certain leases have renewal options for additional terms. The leases provide for base monthly rentals and reimbursements for real estate taxes, escalations linked to the consumer price index or common area maintenance known as operating expense escalation. Operating expense reimbursements are reflected in our March 31, 2024 and 2023 condensed consolidated statements of operations as rental revenue.
Rental revenue includes fixed and variable payments. Fixed payments primarily relate to base rent and variable payments primarily relate to tenant expense reimbursements for certain property operating costs. The components of rental revenue for the three months ended March 31, 2024 and 2023 are as follows (amounts in thousands):
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Three Months Ended
Rental revenueMarch 31, 2024March 31, 2023
Fixed payments$136,353 $124,564 
Variable payments17,529 15,527 
Total rental revenue