Tiaa Real Estate Account 10-Q 11 Aug 20 2020 Q2 Quarterly report Financial data

Document And Entity Information

Document And Entity Information	6 Months Ended
	Jun. 30, 2020shares
Cover [Abstract]
Document Type	10-Q
Document Period End Date	Jun. 30, 2020
Entity Registrant Name	TIAA REAL ESTATE ACCOUNT
Current Fiscal Year End Date	--12-31
Entity Common Stock, Shares Outstanding (in shares)	0
Amendment Flag	false
Entity Central Index Key	0000946155
Entity Filer Category	Non-accelerated Filer
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q2
Entity Current Reporting Status	Yes
Entity Small Reporting Company	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Document Quarterly Report	true
Document Transition Report	false

CONSOLIDATED STATEMENTS OF ASSE

CONSOLIDATED STATEMENTS OF ASSETS AND LIABILITIES - USD ($) shares in Millions, $ in Millions		Jun. 30, 2020	Dec. 31, 2019
Investments, at fair value:
Real estate properties (cost: $14,146.0 and $13,048.5)		$ 16,748.6	$ 15,835
Real estate joint ventures and funds (cost: $5,091.4 and $6,244.4)		6,365.3	7,516
Marketable securities:
Real estate-related (cost: $812.3 and $686.0)	[1]	838.4	825.7
Other (cost: $1,389.7 and $4,144.7)		1,389.7	4,150.2
Loans receivable (principal: $1,532.8 and $1,504.5)		1,509.2	1,503.1
Loans receivable with related parties (principal: $69.3 and $69.3)		69	69
Total investments (cost: $23,041.5 and $25,697.4)		26,920.2	29,899
Cash and cash equivalents		20.9	15.1
Due from investment manager		0	5.5
Other	[2]	309.4	290.3
TOTAL ASSETS		27,250.5	30,209.9
LIABILITIES
Loans payable, at fair value (principal outstanding: $2,466.3 and $2,338.0)		2,457	2,365
Line of credit, at fair value		291	250
Due to investment manager		1.6	0
Accrued real estate property expenses		241.5	225.9
Payable for collateral for securities loaned		8.8	25.7
Other		37.8	35.4
TOTAL LIABILITIES		3,037.7	2,902
COMMITMENTS AND CONTINGENCIES
NET ASSETS
Accumulation Fund		23,690.4	26,759.1
Annuity Fund		522.4	548.8
TOTAL NET ASSETS		$ 24,212.8	$ 27,307.9
NUMBER OF ACCUMULATION UNITS OUTSTANDING (in shares)		54.5	60.8
NET ASSET VALUE, PER ACCUMULATION UNIT (in dollars per share)		$ 434.444	$ 440.422
[1]	Includes securities loaned of $8.5 million at June 30, 2020 and $25.2 million at December 31, 2019 .
[2]	Includes cash collateral for securities loaned of $8.8 million at June 30, 2020 and $25.7 million at December 31, 2019 .

CONSOLIDATED STATEMENTS OF AS_2

CONSOLIDATED STATEMENTS OF ASSETS AND LIABILITIES (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Securities loaned	$ 8.5	$ 25.2
Cash collateral for securities loaned	8.8	25.7
Real estate properties at cost	14,146	13,048.5
Real estate joint ventures and funds at cost	5,091.4	6,244.4
Real estate-related Marketable securities at cost	812.3	686
Other Marketable securities at cost	1,389.7	4,144.7
Loans receivable at cost	1,532.8	1,504.5
Loans receivable from related parties at cost	69.3	69.3
Cost of Total investments	23,041.5	25,697.4
Principal outstanding on loans payable	$ 2,466.3	$ 2,338

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Real estate income, net:
Rental income	$ 311.3	$ 278.4	$ 611	$ 541
Real estate property level expenses and taxes:
Operating expenses	60.9	58.1	130.1	117.3
Real estate taxes	53.9	45.4	104	92
Interest expense	25.6	27.3	49.9	53
Total real estate property level expenses and taxes	140.4	130.8	284	262.3
Real estate income, net	170.9	147.6	327	278.7
Income from real estate joint ventures and funds	22.2	59.8	77.4	109.5
Interest	21.8	45.1	64.3	86.2
Dividends	6.6	7.2	11.1	11.6
TOTAL INVESTMENT INCOME	221.5	259.7	479.8	486
Expenses:
Investment management charges	13	16.8	30.2	36.3
Administrative charges	11.6	12.2	23.3	25.5
Distribution charges	4.7	8.7	12.3	16.6
Mortality and expense risk charges	0.3	0.4	0.6	0.7
Liquidity guarantee charges	14.9	13.2	31.1	26.1
TOTAL EXPENSES	44.5	51.3	97.5	105.2
INVESTMENT INCOME, NET	177	208.4	382.3	380.8
Net realized gain (loss) on investments:
Real estate properties	1.2	0	(58)	0
Real estate joint ventures and funds	(0.2)	(48.8)	(460.5)	(43.7)
Marketable securities	(13.9)	112.1	21.3	253.1
Loans receivable	0	0	(1.6)	0
Net realized (loss) gain on investments	(12.9)	63.3	(498.8)	209.4
Net change in unrealized appreciation (depreciation) on:
Real estate properties	(380.6)	170.3	(183.9)	244.2
Real estate joint ventures and funds	(241.2)	41.2	59.3	43.7
Marketable securities	108.8	(93.8)	(122)	(17.5)
Loans receivable	(11.6)	(4)	(22.2)	(2.8)
Loans receivable with related parties	0.5	0	0	0
Loans payable	(9.4)	(36.7)	36.3	(66.3)
Net change in unrealized (depreciation) appreciation on investments and loans payable	(533.5)	77	(232.5)	201.3
NET REALIZED AND UNREALIZED (LOSS) GAIN ON INVESTMENTS AND LOANS PAYABLE	(546.4)	140.3	(731.3)	410.7
NET (DECREASE) INCREASE IN NET ASSETS RESULTING FROM OPERATIONS	$ (369.4)	$ 348.7	$ (349)	$ 791.5

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN NET ASSETS - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
FROM OPERATIONS
Investment income, net	$ 177	$ 208.4	$ 382.3	$ 380.8
Net realized (loss) gain on investments	(12.9)	63.3	(498.8)	209.4
Net change in unrealized (depreciation) appreciation on investments and loans payable	(533.5)	77	(232.5)	201.3
NET (DECREASE) INCREASE IN NET ASSETS RESULTING FROM OPERATIONS	(369.4)	348.7	(349)	791.5
FROM PARTICIPANT TRANSACTIONS
Premiums	429.3	671.1	1,131.9	1,348.5
Annuity payments	(11.8)	(11.9)	(24.1)	(23.4)
Withdrawals and death benefits	(1,850.4)	(597)	(3,853.9)	(1,226.6)
NET CHANGE IN NET ASSETS RESULTING FROM PARTICIPANT TRANSACTIONS	(1,432.9)	62.2	(2,746.1)	98.5
NET CHANGE IN NET ASSETS	(1,802.3)	410.9	(3,095.1)	890
NET ASSETS
Beginning of period	26,015.1	26,321.7	27,307.9	25,842.6
End of period	$ 24,212.8	$ 26,732.6	$ 24,212.8	$ 26,732.6

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES
Net (decrease) increase in net assets resulting from operations		$ (369.4)	$ 348.7	$ (349)	$ 791.5
Adjustments to reconcile net changes in net assets resulting from operations to net cash provided by (used in) operating activities:
Net realized loss (gain) on investments		12.9	(63.3)	498.8	(209.4)
Net change in unrealized depreciation (appreciation) on investments and loans payable		533.5	(77)	232.5	(201.3)
Purchase of real estate properties				(1,092.7)	(453.6)
Capital improvements on real estate properties				(118.1)	(124.5)
Proceeds from sale of real estate properties				353.4	3.1
Purchases of long term investments				(798.2)	(599.4)
Proceeds from long term investments				1,446.5	1,015.3
Purchases and originations of loans receivable				(111.3)	(219)
Proceeds from sales of loans receivable				63	24.1
Proceeds from payoffs of loans receivable				16.7	0
Decrease (Increase) in other investments				2,748.2	(109.8)
Change in due to (from) investment manager				7.1	(4.2)
(Increase) Decrease in other assets				(24.3)	55.8
Decrease in other liabilities				(5.6)	(51.3)
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES				2,867	(82.7)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from line of credit				540	0
Payments on line of credit				(499)	0
Payments of mortgage loans				(161.3)	(9.6)
Premiums		429.3	671.1	1,131.9	1,348.5
Annuity payments		(11.8)	(11.9)	(24.1)	(23.4)
Withdrawals and death benefits		(1,850.4)	(597)	(3,853.9)	(1,226.6)
NET CASH (USED IN) PROVIDED BY FINANCING ACTIVITIES				(2,866.4)	88.9
NET INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH				0.6	6.2
CASH, CASH EQUIVALENTS AND RESTRICTED CASH
Beginning of period cash, cash equivalents and restricted cash				40.4	47.3
Net increase in cash, cash equivalents and restricted cash				0.6	6.2
TOTAL CASH, CASH EQUIVALENTS AND RESTRICTED CASH		41	53.5	41	53.5
SUPPLEMENTAL DISCLOSURES:
Cash paid for interest				49.9	53.4
Mortgage loan assumed as part of real estate acquisition				289.6	110
Loan receivable converted to equity in real estate investment				(1.7)	0
Cash and cash equivalents		20.9	8	20.9	8
Restricted cash	[1]	20.1	45.5	20.1	45.5
TOTAL CASH, CASH EQUIVALENTS AND RESTRICTED CASH		$ 41	$ 53.5	$ 41	$ 53.5
[1]	Restricted cash is included within other assets in the Consolidated Statements of Assets and Liabilities.

Organization and Significant Ac

Organization and Significant Accounting Policies	6 Months Ended
	Jun. 30, 2020
Accounting Policies [Abstract]
Organization and Significant Accounting Policies	Organization and Significant Accounting Policies Business: The TIAA Real Estate Account (“Account”) is an insurance separate account of Teachers Insurance and Annuity Association of America (“TIAA”) and was established by resolution of TIAA’s Board of Trustees (the “Board”) on February 22, 1995, under the insurance laws of the State of New York, for the purpose of funding variable annuity contracts issued by TIAA. The Account offers individual and group accumulating annuity contracts (with contributions made on a pre-tax or after-tax basis), as well as individual lifetime and term-certain variable payout annuity contracts (including the payment of death benefits to beneficiaries). Investors are entitled to transfer funds to or from the Account, and make withdrawals from the Account on a daily basis, under certain circumstances. Funds invested in the Account for each category of contract are expressed in terms of units, and unit values will fluctuate depending on the Account’s performance. The investment objective of the Account is to seek favorable total returns primarily through the rental income and appreciation of a diversified portfolio of directly held, private real estate investments and real estate-related investments while offering investors guaranteed, daily liquidity. The Account holds real estate properties directly and through subsidiaries wholly-owned by TIAA for the sole benefit of the Account. The Account also holds limited interests in real estate joint ventures and funds, as well as investments in loans receivable with real estate properties as underlying collateral. Additionally, the Account invests in real estate-related and non-real estate-related publicly traded securities, cash and other instruments to maintain adequate liquidity levels for operating expenses, capital expenditures and to fund benefit payments (withdrawals, transfers and related transactions). The Consolidated Financial Statements were prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP"), which requires the use of estimates made by management. Actual results may vary from those estimates and such differences may be material. The Consolidated Financial Statements of the Account as of June 30, 2020 and for the three and six months ended June 30, 2020 and 2019 are unaudited and include all adjustments necessary to present a fair statement of results for the interim periods presented. Results of operations for the interim periods are not necessarily indicative of results for the entire year. These Consolidated Financial Statements have been prepared in accordance with the applicable rules and regulations of the Securities and Exchange Commission (“SEC”). Accordingly, certain footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted from this report pursuant to the rules of the SEC. As a result, these Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements and notes thereto included in the Account’s annual report on Form 10-K for the year ended December 31, 2019 . The following is a summary of the significant accounting policies of the Account. Basis of Presentation: The accompanying Consolidated Financial Statements include the Account and those subsidiaries wholly-owned by TIAA for the sole benefit of the Account. All significant intercompany accounts and transactions between the Account and such subsidiaries have been eliminated. The Accumulation Unit Value (“AUV”) used for financial reporting purposes may differ from the AUV used for processing transactions. The AUV used for financial reporting purposes includes security and participant transactions effective through the period end date to which this report relates. Total return is computed based on the AUV used for processing transactions. Determination of Investments at Fair Value: The Account reports all investments at fair value in accordance with the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) 946 —Financial Services—Investment Companies ("ASC 946") . Further in accordance with the adoption of the fair value option allowed under ASC 825 —Financial Instruments , and at the election of Account management, loans payable and a line of credit are reported at fair value. The FASB has defined fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants excluding transaction costs. The following is a description of the valuation methodologies used to determine the fair value of the Account’s investments and investment related loans payable. Valuation of Real Estate Properties —Investments in real estate properties are stated at fair value, as determined in accordance with policies and procedures reviewed by the Investment Committee of the Board and in accordance with the responsibilities of the Board as a whole. Accordingly, the Account does not record depreciation. Determination of fair value involves significant levels of judgment because the actual fair value of real estate can be determined only by negotiation between the parties in a sales transaction. The Account’s primary objective when valuing its real estate investments is to produce a valuation that represents a reasonable estimate of the fair value of its investments. Implicit in the Account’s definition of fair value are the consummation of a sale as of a specified date and the passing of title from seller to buyer under conditions whereby: • Buyer and seller are similarly motivated; • Both parties are well informed or well advised, and acting in what they consider their best interests; • A reasonable time is allowed for exposure in the open market; • Payment is made in terms of cash or in terms of financial arrangements comparable thereto; and • The price represents the normal consideration for the property sold unaffected by special or creative financing or sales concessions granted by anyone associated with the sale. Property and investment values are affected by, among other things, the availability of capital, occupancy rates, rental rates, and interest and inflation rates. As a result, determining real estate and investment values involves many assumptions. Key inputs and assumptions include rental income and expense amounts, related rental income and expense growth rates, capital expenditures, discount rates and capitalization rates. Valuation techniques include discounted cash flow analysis, prevailing market capitalization rates or multiples applied to earnings from the property, analysis of recent comparable sales transactions, actual sale negotiations and bona fide purchase offers received from third parties. Amounts ultimately realized from each investment may vary significantly from the fair value presented. Real estate properties owned by the Account are initially valued based on an independent third party appraisal, as reviewed by TIAA’s internal appraisal staff and as applicable by the Independent Fiduciary, RERC, LLC (the "Independent Fiduciary"), at the time of the closing of the purchase. Such initial valuation may result in a potential unrealized gain or loss reflecting the difference between an investment’s fair value (i.e., exit price) and its cost basis (which is inclusive of transaction costs). Subsequently, each property is appraised each quarter by an independent third party appraiser, reviewed by TIAA’s internal appraisal staff and as applicable the Account’s Independent Fiduciary. In general, the Account obtains appraisals of its real estate properties spread out throughout the quarter, which is intended to result in appraisal adjustments, and thus, adjustments to the valuations of its holdings (to the extent such adjustments are made) that happen regularly throughout each quarter and not on one specific day or month in each period. Further, management reserves the right to order an appraisal and/or conduct another valuation outside of the normal quarterly process when facts or circumstances at a specific property change. For example, under certain circumstances a valuation adjustment could be made when the account receives a bona fide bid for the sale of a property held within the Account or one of the Account’s joint ventures. Adjustments may be made for events or circumstances indicating an impairment of a tenant’s ability to pay amounts due to the Account under a lease (including due to a bankruptcy filing of that tenant). Alternatively, adjustments may be made to reflect the execution or renewal of a significant lease. Also, adjustments may be made to reflect factors (such as sales values for comparable properties or local employment rate) bearing uniquely on a particular region in which the Account holds properties. TIAA’s internal appraisal staff oversees the entire appraisal process, in conjunction with the Independent Fiduciary (the Independent Fiduciary is more fully described in the following paragraph). Any differences in the conclusions of TIAA’s internal appraisal staff and the independent appraiser will be reviewed by the Independent Fiduciary, which will make a final determination on the matter (which may include ordering a subsequent independent appraisal). The Independent Fiduciary was initially appointed in March 2006 by a special subcommittee of the Investment Committee of the Board to, among other things, oversee the entire appraisal process. In March 2018, RERC, LLC, was re-appointed as the Account's Independent Fiduciary for a term expiring in February 2021. The Independent Fiduciary must approve all independent appraisers used by the Account. All appraisals are performed in accordance with Uniform Standards of Professional Appraisal Practices, the real estate appraisal industry standards created by The Appraisal Foundation. Real estate appraisals are estimates of property values based on a professional’s opinion. Appraisals of properties held outside of the U.S. are performed in accordance with industry standards commonly applied in the applicable jurisdiction. These independent appraisers are always expected to be MAI-designated members of the Appraisal Institute (or its European equivalent, Royal Institute of Chartered Surveyors) and state certified appraisers from national or regional firms with relevant property type experience and market knowledge. Under the Account’s current procedures, each independent appraisal firm will be rotated off of a particular property at least every three years , although such appraisal firm may perform appraisals of other Account properties subsequent to such rotation. Also, the Independent Fiduciary may require additional appraisals if factors or events have occurred that could materially change a property’s value (including those identified previously) and such change is not reflected in the quarterly valuation review, or otherwise to ensure that the Account is valued appropriately. The Independent Fiduciary must also approve any valuation change of real estate-related assets where a property’s value changed by more than 6% from the most recent independent annual appraisal, or if the value of the Account would change by more than 4% within any calendar quarter or more than 2% since the prior calendar month. When a real estate property is subject to a mortgage, the property is valued independently of the mortgage and the property and mortgage fair values are reported separately (see Valuation of Loans Payable ). The Independent Fiduciary reviews and approves all mortgage valuation adjustments before such adjustments are recorded by the Account. The Account continues to use the revised value for each real estate property and mortgage loan payable to calculate the Account’s daily net asset value until the next valuation review or appraisal. Valuation of Real Estate Joint Ventures —Real estate joint ventures are stated at the fair value of the Account’s ownership interests of the underlying entities. The Account’s ownership interests are valued based on the fair value of the underlying real estate, any related loans payable, and other factors, such as ownership percentage, ownership rights, buy/sell agreements, distribution provisions and capital call obligations. The fair value of real estate and loans payable held by joint ventures is determined in the same manner described above in Valuation of Real Estate Properties. The Independent Fiduciary reviews and approves all valuation adjustments before such adjustments are recorded by the Account. Upon the disposition of all real estate investments by an investee entity, the Account will continue to state its equity in the remaining net assets of the investee entity during the wind down period, if any, which occurs prior to the dissolution of the investee entity. Valuation of Real Estate Funds —Real estate fund interests are stated at the fair value of the Account’s ownership in the real estate fund. Management uses net asset value information provided by limited partners as a practical expedient to estimate fair value. The Account receives estimates from limited partners on a quarterly basis, and audited information is provided annually. Upon receipt of the information, management reviews and determines whether the net asset values provided are an appropriate representation of the fair value of the Account's interests in the real estate funds and makes valuation adjustments as necessary. Valuation of real estate funds proceeds under the direction of the Investment Committee of the Board and in accordance with the responsibilities of the Board as a whole. Valuation of Marketable Securities —Equity securities listed or traded on any national market or exchange are valued at the last sale price as of the close of the principal securities market or exchange on which such securities are traded or, if there is no sale, at the mean of the last bid and asked prices on such market or exchange, exclusive of transaction costs . Valuation of Debt Securities —Debt securities with readily available market quotations, other than money market instruments, are generally valued at the most recent bid price or the equivalent quoted yield for such securities (or those of comparable maturity, quality and type). Debt securities for which market quotations are not readily available, are valued at fair value as determined by management and the Investment Committee of the Board and in accordance with the responsibilities of the Board as a whole. Short-term investments are valued in the same manner as debt securities, as described above. Money market instruments are valued at amortized cost, which approximates fair value. Valuation of Loans Receivable (i.e., the Account as a creditor) —Loans receivable are stated at fair value and are initially valued at the face amount of the loan funding. Subsequently, loans receivable are valued at least quarterly by TIAA’s internal valuation department based on market factors, such as market interest rates and spreads for comparable loans, the liquidity for loans of similar characteristics, the performance of the underlying collateral (such as the loan- to-value ratio and the cash flow of the underlying collateral) and the credit quality of the counterparty. The Independent Fiduciary reviews and approves all loan receivable valuation adjustments before such adjustments are recorded by the Account. The Account continues to use the revised value for each loan receivable to calculate the Account’s daily net asset value until the next valuation review. Valuation of Loans Payable (i.e., the Account as a debtor) —Mortgage or other loans payable, including the Account's line of credit, are stated at fair value. The estimated fair value of loans payable is generally based on the amount at which the liability could be transferred in a current transaction, exclusive of transaction costs. Fair values are estimated based on market factors, such as market interest rates and spreads on comparable loans, the liquidity for loans of similar characteristics, the performance of the underlying collateral (such as the loan-to-value ratio and the cash flow of the underlying collateral), the maturity date of the loan, the return demands of the market, and the credit quality of the Account. Different assumptions or changes in future market conditions could significantly affect estimated fair values. At times, the Account may assume debt in connection with the purchase of real estate (including under the Account's line of credit or additional credit facilities). The Independent Fiduciary reviews and approves all valuation adjustments before such adjustments are recorded by the Account. See Note 5 — Assets and Liabilities Measured at Fair Value on a Recurring Basis for further discussion and disclosure regarding the determination of the fair value of the Account’s investments. Accumulation and Annuity Funds: The accumulation fund represents the net assets attributable to participants in the accumulation phase of their investment (“Accumulation Fund”). The annuity fund represents the net assets attributable to the participants currently receiving annuity payments (“Annuity Fund”). The net increase or decrease in net assets from investment operations is apportioned between the funds based upon their relative daily net asset values. Once an Account participant begins receiving lifetime annuity income benefits, payment levels cannot be reduced as a result of the Account’s actual mortality experience. In addition, the contracts pursuant to which the Account is offered are required to stipulate the maximum expense charge for all Account level expenses that can be assessed, which is not to exceed 2.5% of average net assets per year. The Account pays a fee to TIAA to assume mortality and expense risks. Accounting for Investments: The investments held by the Account are accounted for as follows: Real Estate Properties —Rent from real estate properties consists of all amounts earned under tenant leases, including base rent, recoveries of real estate taxes and other expenses and charges for miscellaneous services provided to tenants. Rental income is recognized in accordance with the billing terms of the lease agreements. The Account bears the direct expenses of the real estate properties owned. These expenses include, but are not limited to, fees to local property management companies, property taxes, utilities, maintenance, repairs, insurance, and other operating and administrative costs. An estimate of the net operating income earned from each real estate property is accrued by the Account on a daily basis and such estimates are adjusted when actual operating results are determined. Real Estate Joint Ventures —The Account has ownership interests in various real estate joint ventures (collectively, the “joint ventures”). The Account records its contributions as increases to its investments in the joint ventures, and distributions from the joint ventures are treated as income within income from real estate joint ventures and funds in the Account’s Consolidated Statements of Operations. Distributions that are identified as returns of capital are recorded as a reduction to the cost basis of the investment, whereas distributions identified as capital gains or losses are recorded as realized gains or losses. Income distributions from the joint ventures are recorded based on the Account’s proportional interest of the income distributed by the joint ventures. Income and losses incurred but not yet distributed or realized from the Account by the joint ventures are recorded as unrealized gains and losses. Real Estate Funds —The Account has limited ownership interests in various private real estate funds. The Account records its contributions as increases to the investments, and distributions from the investments are treated as income within income from real estate joint ventures and funds in the Account’s Consolidated Statements of Operations. Distributions that are identified as returns of capital are recorded as a reduction to the cost basis of the investment, whereas distributions identified as capital gains or losses are recorded as realized gains or losses. Unrealized gains and losses are recorded based upon the changes in the net asset values of the real estate funds as determined from the financial statements of the real estate funds when received by the Account. Prior to the receipt of the financial statements from the real estate funds, the Account estimates the value of its interest using information provided by the limited partners. Changes in value based on such estimates are recorded by the Account as unrealized gains and losses. Marketable Securities —Transactions in marketable securities are accounted for as of the date the securities are purchased or sold (trade date). Interest income is recorded as earned. Dividend income is recorded on the ex-dividend date within dividend income. Dividends that are identified as returns of capital are recorded as a reduction to the cost basis of the investment, whereas dividends identified as capital gains or losses are recorded as realized gains or losses. Realized gains and losses on securities transactions are accounted for on the specific identification method. Loans Receivable —The Account may originate, purchase or sell loans collateralized by real estate. The cost basis of originated loans is comprised of the principal balance and direct costs incurred that represent a component of the loan’s reported fair value. The cost basis of purchased loans consists of the purchase price of the loan and additional direct costs incurred that represent a component of the loan’s reported fair value. Additional costs incurred by the Account to originate or purchase loans that do not represent a component of a loan’s fair value are recorded as expenses in the period incurred. Nonrefundable origination fees paid by borrowers are recognized as interest income once all activities required to execute the loan are completed. Prepayment fees received from the payoff of loans in advance of their maturity date are recognized as interest income on the date the payoff occurs. Interest income from loans in accrual status is recognized based on the current coupon rate of the loans. Interest income accruals are suspended when a loan becomes a non-performing loan, defined as a loan more than ninety days in arrears or at any point when management believes the full collection of principal is doubtful. Interest income on non-performing loans is recognized only as cash payments are received. Loans can be rehabilitated to accrual status once all past due interest has been collected and management believes the full collection of principal is likely. Realized and Unrealized Gains and Losses —Realized gains and losses are recorded at the time an investment is sold or a distribution is received in relation to an investment sale from a real estate joint venture or fund. Real estate and loan receivable transactions are accounted for as of the date on which the purchase or sale transactions close (settlement date). The Account recognizes a realized gain on the sale of an investment to the extent that the contract sales price exceeds the cost-to-date of the investment being sold. A realized loss occurs when the cost-to-date exceeds the sales price. Realized gains and losses from partial sales of non-financial assets are recognized in accordance with ASC 610-20 - Gains and Losses from the Derecognition of Nonfinancial Assets . Realized gains and losses from the sale of financial assets are recognized in accordance with ASC 860 - Transfers and Servicing . Unrealized gains and losses are recorded as the fair values of the Account’s investments are adjusted, and as discussed within the Real Estate Joint Ventures, Real Estate Funds and Loans Receivable sections above. Unrealized gains and losses are recorded as the fair values of the Account’s investments are adjusted, and as discussed within the Real Estate Joint Ventures and Real Estate Funds sections above. Net Assets —The Account’s net assets as of the close of each valuation day are valued by taking the sum of: • the value of the Account’s cash, cash equivalents, and short-term and other debt instruments; • the value of the Account’s other securities and other non-real estate assets; • the value of the individual real properties (based on the most recent valuation of that property) and other real estate-related investments owned by the Account; • an estimate of the net operating income accrued by the Account from its properties, other real estate-related investments and non-real estate-related investments (including short-term marketable securities) since the end of the prior valuation day; and • actual net operating income earned from the Account’s properties, other real estate-related investments and non-real estate-related investments (but only to the extent any such item of income differs from the estimated income accrued for on such investments), and then reducing the sum by liabilities held within the Account, including the daily investment management fee, administration and distribution fees, mortality and expense fee, liquidity guarantee fee, and certain other expenses attributable to operating the Account. Daily estimates of net operating income are adjusted to reflect actual net operating income on a monthly basis, at which time such adjustments (if any) are reflected in the Account’s unit value. After the end of every quarter, the Account reconciles the amount of expenses deducted from the Account (which is established in order to approximate the costs that the Account will incur) with the expenses the Account actually incurred. If there is a difference, the Account adds it to or deducts it from the Account in equal daily installments over the remaining days of the following quarter. Material differences may be repaid in the current calendar quarter. The Account’s at cost deductions are based on projections of Account assets and overall expenses, and the size of any adjusting payments will be directly affected by the difference between management’s projections and the Account’s actual assets or expenses. Variable Interest Entities: Variable interests are financial relationships which expose a reporting entity to the risks and rewards of variability in the entity's assets and operations. When variable interests exist, they are subject to evaluation under the variable interest entity ("VIE") model if any one of the following four characteristics are present: (a) the entity is insufficiently capitalized; (b) the equity holders do not have power to control the activities that most significantly impact the entity's financial performance; (c) the voting rights of the equity holders are not proportionate to their economic interests; or (d) the equity holders are not exposed to the residual losses or benefits that would normally be associated with equity interests. ASC 810 - Consolidation prohibits a reporting entity that qualifies as an investment company under ASC 946 from consolidating an investee that is not an investment company. This scope exception does not apply to situations in which an investment company has an interest in another investment company. Accordingly, the Account's investments in other investment companies (e.g., real estate funds) are subject to evaluation under the VIE model. The Account consolidates a VIE if it concludes that the Account is the primary beneficiary of the VIE. The primary beneficiary has both: (i) the power to direct the activities of a VIE that most significantly impact the VIE's economic performance; and (ii) the obligation to absorb losses or the right to receive benefits that could potentially be significant to the VIE. The following activities have been identified by the Account as having the most significant impact on a VIE's economic performance: • control over the ability to acquire and dispose of investments held by the entity; • the ability to kick out a managing entity without cause, either unilaterally or with a group of equity investors; • the ability to modify the power of the managing entity without its consent; and • control over the day-to-day decision making of the underlying investments An equity investor in a VIE may not actively be involved in the significant activities (i.e., it may cede day-to-day decision making to a third party), but if the equity investor has approval rights or some other mechanism to retain ultimate control, the equity investor with these rights would be concluded as having power over the activity. On a quarterly basis, the Account evaluates all involvements with VIEs, including any changes to governing powers of continuing VIEs. The consolidation status of VIEs may change as a result of such continued evaluation. At the reporting date, the Account was not deemed to be the primary beneficiary of any VIEs. Refer to Note 7—Investments in Real Estate Funds for additional detail. Cash and Cash Equivalents: Cash and cash equivalents are balances held by the Account in bank deposit accounts which, at times, exceed federally insured limits. The Account’s management monitors these balances to mitigate the exposure of risk due to concentration and has not experienced any losses from such concentration. Other Assets and Other Liabilities: Other assets and other liabilities consist of operating assets and liabilities utilized and held at each individual real estate property investment. Other assets consist of, amongst other items, cash, tenant receivables and prepaid expenses; whereas other liabilities primarily consist of security deposits. Other assets also include cash collateral held for securities on loan. Federal Income Taxes: Based on provisions of Section 817 of the Internal Revenue Code of 1986, as amended, the Account is taxed as a segregated asset account of TIAA and as such, the Account incurs no material federal income tax attributable to the net investment activity of the Account. The Account’s federal income tax return is generally subject to examination for a period of three years after filed. State and local tax returns may be subject to examination for an additional period of time depending on the jurisdiction. Management has analyzed the Account’s tax positions taken for all open federal income tax years and has concluded that no provision for federal income tax is required in the Account’s Consolidated Financial Statements. Restricted Cash: The Account held restricted cash in escrow accounts for security deposits, as required by certain states, as well as for property taxes, insurance, and various other property related matters as required by certain creditors related to outstanding loans payable collateralized by certain real estate investments. These amounts are recorded within other assets on the Consolidated Statements of Assets and Liabilities. See Note 9—Loans Payable for additional information regarding the Account’s outstanding loans payable. Changes in Net Assets: Premiums include premiums paid by existing accumulation unit holders in the Account and transfers into the Account. Withdrawals and death benefits include withdrawals out of the Account which include transfers out of the Account and required minimum distributions. Due to/from Investment Manager: Due to/from investment manager represents amounts that are to be paid or received by TIAA on behalf of the Account. Amounts generally are paid or received by the Account within one or two business days and no interest is contractually charged on these amounts. Securities Lending: The Account may lend securities to qualified borrowers to earn additional income. The Account receives cash collateral against the loaned securities and maintains cash collateral in an amount not less than 100% of the market value of loaned securities during the period of the loan; any additional collateral required due to changes in security values is delivered to the Account the next business day. Cash collateral received by the Account is invested exclusively in an interest-bearing deposit account. The value of the loaned securities and the liability to return the cash collateral received are reflected in the Consolidated Statements of Assets and Liabilities. When loaning securities, the Account retains the benefits of owning the securities, including the economic equivalent of dividends or interest generated by the securities. All income generated by the securities lending program is reflected within interest income on the

Related Party Transactions

Related Party Transactions	6 Months Ended
	Jun. 30, 2020
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions Investment management, administrative and distribution services are provided to the Account at cost by TIAA. Services provided at cost are paid by the Account on a daily basis based upon projected expenses to be provided to the Account. Payments are adjusted periodically to ensure daily payments are as close as possible to the Account’s actual expenses incurred. Differences between actual expenses and the amounts paid by the Account are reconciled and adjusted quarterly. Investment management services for the Account are provided by TIAA officers, under the direction and control of the Board, pursuant to investment management procedures adopted by TIAA for the Account. TIAA’s investment management decisions for the Account are subject to review by the Independent Fiduciary. TIAA also provides various portfolio accounting and related services for the Account. The Account is a party to the Distribution Agreement for the Contracts Funded by the TIAA Real Estate Account (the “Distribution Agreement”), dated January 1, 2008, by and among TIAA, for itself and on behalf of the Account, and TIAA-CREF Individual and Institutional Services, LLC (“Services”). Services is a direct wholly-owned subsidiary of TIAA, and is registered with the SEC as a broker-dealer and a registered investment adviser and is a member of the Financial Industry Regulatory Authority. Pursuant to the Distribution Agreement, Services performs distribution services for the Account which include, among other things, (i) distribution of annuity contracts issued by TIAA and funded by the Account, (ii) advising existing annuity contract owners in connection with their accumulations and (iii) helping employers implement and manage retirement plans. In addition, TIAA performs administrative functions for the Account, which include, among other things, (i) maintaining accounting records and performing accounting services, (ii) receiving and allocating premiums, (iii) calculating and making annuity payments, (iv) processing withdrawal requests, (v) providing regulatory compliance and reporting services, (vi) maintaining the Account’s records of contract ownership and (vii) otherwise assisting generally in all aspects of the Account’s operations. Both distribution services (pursuant to the Distribution Agreement) and administrative services are provided to the Account by Services and TIAA, as applicable, on an at cost basis. The Distribution Agreement is terminable by either party upon 60 days written notice and terminates automatically upon any assignment thereof. In addition to providing the services described above, TIAA charges the Account fees to bear certain mortality and expense risks, and risks with providing the liquidity guarantee (described below). These fees are charged as a percentage of the net assets of the Account. Rates for these fees are established annually. Once an Account participant begins receiving lifetime annuity income benefits, payment levels cannot be reduced as a result of the Account’s actual mortality experience. As such, mortality and expense risk expenses are contractual charges for TIAA’s assumption of this risk. TIAA provides the Account with a liquidity guarantee enabling the Account to have funds available to meet participant redemption, transfer or cash withdrawal requests. The liquidity guarantee is required by the New York State Department of Financial Services and is subject to a prohibited transaction exemption that the Account received in 1996 (96-76) from the U.S. Department of Labor (the “PTE 96-76”). The Account pays TIAA for the risk associated with providing the liquidity guarantee through a daily deduction from the Account’s net assets. Whether the liquidity guarantee is exercised is based on the cash level of the Account from time to time, as well as recent participant withdrawal activity and the Account’s expected working capital, debt service and cash needs, and subject to the oversight of the Independent Fiduciary. If the Account cannot fund participant withdrawal or redemption requests from the Account’s own cash flow and liquid investments, TIAA will fund them by purchasing accumulation units issued by the Account (accumulation units that are purchased by TIAA are generally referred to as “liquidity units”). TIAA guarantees that participants can redeem their accumulation units at the accumulation unit value next determined after their transfer or cash withdrawal request is received in good order. Liquidity units owned by TIAA are valued in the same manner as accumulation units owned by the Account’s participants. Expenses for the services and fees described above are identified as such in the accompanying Consolidated Statements of Operations and are further identified as "Expenses" in Note 11—Financial Highlights . The Account has loans receivable outstanding with related parties as of June 30, 2020 . The loans are with joint ventures in which the Account also has an equity interest. The loans are held at fair value in accordance with the valuation policies described in Note 1—Organization and Significant Accounting Policies . The following table presents the key terms of the loans as of the reporting date: Related Party Equity Ownership Interest Interest Rate Maturity Date Fair Value at Principal June 30, 2020 December 31, 2019 2020 2019 (Unaudited) 36.5 36.5 MRA Hub 34 Holding, LLC 95.00% 2.50% + LIBOR 9/1/2022 $ 36.5 $ 36.5 32.8 32.8 THP Student Housing, LLC 97.00% 3.200% 9/1/2024 32.5 32.5 TOTAL LOANS RECEIVABLE WITH RELATED PARTIES $ 69.0 $ 69.0

Concentrations of Risk

Concentrations of Risk	6 Months Ended
	Jun. 30, 2020
Risks and Uncertainties [Abstract]
Concentrations of Risk	Concentrations of Risk The outbreak of the novel coronavirus (commonly known as “COVID-19”) and the subsequent global pandemic began significantly impacting the U.S. and global financial markets and economies during the first quarter of 2020. During the second quarter of 2020, the Account received multiple requests for rent and loan payment relief as a result of the COVID-19 pandemic. Requests have generally been comprised of deferrals, with payments postponed for a brief period (i.e., less than six months) and then repaid over the remaining duration of the contract. As of June 30, 2020, the Account has not had material exposure to rent concessions, tenant defaults or loan defaults. The duration and extent of COVID-19 over the long-term cannot be reasonably estimated at this time. The ultimate impact of the COVID-19 pandemic and the extent to which the COVID-19 pandemic impacts the Account’s business, results of operations, investments, and cash flows will depend on future developments, which are highly uncertain and difficult to predict. Concentrations of risk may arise when a number of properties are located in a similar geographic region such that the economic conditions of that region could impact tenants’ obligations to meet their contractual obligations or cause the values of individual properties to decline. Additionally, concentrations of risk may arise if any one tenant comprises a significant amount of the Account's rent, or if tenants are concentrated in a particular industry. As of June 30, 2020 , the Account had no significant concentrations of tenants as no single tenant had annual contract rent that made up more than 4% of the rental income of the Account. Moreover, the Account's tenants have no notable concentration present in any one industry. There are no significant lease expirations scheduled to occur over the next twelve months. The Account’s wholly-owned real estate investments and investments in joint ventures are located in the United States. The following table represents the diversification of the Account’s portfolio by region and property type as of June 30, 2020 (unaudited): Diversification by Fair Value (1) West East South Midwest Total Office 13.4 % 19.1 % 5.4 % — % 37.9 % Apartment 9.9 % 6.5 % 8.0 % 1.0 % 25.4 % Retail 6.7 % 3.8 % 7.6 % 0.9 % 19.0 % Industrial 9.3 % 1.6 % 4.7 % 0.5 % 16.1 % Other (2) 0.5 % 0.4 % 0.7 % — % 1.6 % Total 39.8 % 31.4 % 26.4 % 2.4 % 100.0 % (1) Wholly-owned properties are represented at fair value and gross of any debt, while joint venture properties are represented at the net equity value. (2) Represents interests in Storage Portfolio investments, a hotel investment and land. Properties in the “West” region are located in: AK, AZ, CA, CO, HI, ID, MT, NM, NV, OR, UT, WA, WY. Properties in the “East” region are located in: CT, DC, DE, KY, MA, MD, ME, NC, NH, NJ, NY, PA, RI, SC, VA, VT, WV. Properties in the “South” region are located in: AL, AR, FL, GA, LA, MS, OK, TN, TX. Properties in the “Midwest” region are located in: IA, IL, IN, KS, MI, MN, MO, ND, NE, OH, SD, WI.

Leases

Leases	6 Months Ended
	Jun. 30, 2020
Leases [Abstract]
Leases	Leases The Account’s wholly-owned real estate properties are leased to tenants under operating lease agreements which expire on various dates through 2051. Rental income is recognized in accordance with the billing terms of the lease agreements. The leases do not have material variable payments, material residual value guarantees or material restrictive covenants. Certain leases have the option to extend or terminate at the tenant's discretion, with termination options resulting in additional fees due to the Account. Aggregate minimum annual rentals for wholly-owned real estate investments owned by the Account through the non-cancelable lease term, excluding short-term residential leases, as of June 30, 2020 (unaudited) and December 31, 2019 are as follows (millions): As of Years Ended June 30, 2020 December 31, 2019 2020 $ 327.2 (1) $ 550.4 2021 608.3 505.0 2022 527.8 442.1 2023 451.7 381.2 2024 374.5 316.6 Thereafter 1,246.0 1,078.4 Total $ 3,535.5 $ 3,273.7 (1) Representative of minimum rents owed for the remaining months of the calendar year ending December 31, 2020. Certain leases provide for additional rental amounts based upon the recovery of actual operating expenses in excess of specified base amounts, sales volume or contractual increases as defined in the lease agreement. These contractual contingent rentals are not included in the table above. The Account has ground leases for which the Account is the lessee. The leases do not contain material residual value guarantees or material restrictive covenants. The fair value of right-of-use assets and leases liabilities related to ground leases are reflected on the balance sheet within other assets and other liabilities, respectively. The fair values and key terms of the right-of-use assets and lease liabilities related to the Account's ground leases are as follows (millions): As of June 30, 2020 December 31, 2019 (Unaudited) Assets: Right-of-use assets, at fair value $ 35.1 $ 25.7 Liabilities: Ground lease liabilities, at fair value $ 35.1 $ 25.7 As of June 30, 2020 December 31, 2019 Key Terms: (Unaudited) Weighted-average remaining lease term (years) 67.9 84.4 Weighted-average discount rate (1) 7.81 % 6.15 % (1) Discount rates are reflective of the rates utilized during the most recent appraisal of the associated real estate investments. For the six months ended June 30, 2020 , operating lease costs related to ground leases were $ 1.0 million . These costs include variable lease costs, which are immaterial. Aggregate future minimum annual payments for ground leases held by the Account are as follows (millions): As of Years Ended June 30, 2020 December 31, 2019 (Unaudited) 2020 (1) $ 1.1 (1) $ 1.2 2021 2.3 1.2 2022 2.3 1.2 2023 2.3 1.2 2024 2.3 1.3 Thereafter 416.0 375.9 Total $ 426.3 $ 382.0 (1) Representative of minimum rents owed for the remaining months of the calendar year ending December 31, 2020.
Leases	Leases The Account’s wholly-owned real estate properties are leased to tenants under operating lease agreements which expire on various dates through 2051. Rental income is recognized in accordance with the billing terms of the lease agreements. The leases do not have material variable payments, material residual value guarantees or material restrictive covenants. Certain leases have the option to extend or terminate at the tenant's discretion, with termination options resulting in additional fees due to the Account. Aggregate minimum annual rentals for wholly-owned real estate investments owned by the Account through the non-cancelable lease term, excluding short-term residential leases, as of June 30, 2020 (unaudited) and December 31, 2019 are as follows (millions): As of Years Ended June 30, 2020 December 31, 2019 2020 $ 327.2 (1) $ 550.4 2021 608.3 505.0 2022 527.8 442.1 2023 451.7 381.2 2024 374.5 316.6 Thereafter 1,246.0 1,078.4 Total $ 3,535.5 $ 3,273.7 (1) Representative of minimum rents owed for the remaining months of the calendar year ending December 31, 2020. Certain leases provide for additional rental amounts based upon the recovery of actual operating expenses in excess of specified base amounts, sales volume or contractual increases as defined in the lease agreement. These contractual contingent rentals are not included in the table above. The Account has ground leases for which the Account is the lessee. The leases do not contain material residual value guarantees or material restrictive covenants. The fair value of right-of-use assets and leases liabilities related to ground leases are reflected on the balance sheet within other assets and other liabilities, respectively. The fair values and key terms of the right-of-use assets and lease liabilities related to the Account's ground leases are as follows (millions): As of June 30, 2020 December 31, 2019 (Unaudited) Assets: Right-of-use assets, at fair value $ 35.1 $ 25.7 Liabilities: Ground lease liabilities, at fair value $ 35.1 $ 25.7 As of June 30, 2020 December 31, 2019 Key Terms: (Unaudited) Weighted-average remaining lease term (years) 67.9 84.4 Weighted-average discount rate (1) 7.81 % 6.15 % (1) Discount rates are reflective of the rates utilized during the most recent appraisal of the associated real estate investments. For the six months ended June 30, 2020 , operating lease costs related to ground leases were $ 1.0 million . These costs include variable lease costs, which are immaterial. Aggregate future minimum annual payments for ground leases held by the Account are as follows (millions): As of Years Ended June 30, 2020 December 31, 2019 (Unaudited) 2020 (1) $ 1.1 (1) $ 1.2 2021 2.3 1.2 2022 2.3 1.2 2023 2.3 1.2 2024 2.3 1.3 Thereafter 416.0 375.9 Total $ 426.3 $ 382.0 (1) Representative of minimum rents owed for the remaining months of the calendar year ending December 31, 2020.

Assets and Liabilities Measured

Assets and Liabilities Measured at Fair Value on a Recurring Basis	6 Months Ended
	Jun. 30, 2020
Fair Value Disclosures [Abstract]
Assets and Liabilities Measured at Fair Value on a Recurring Basis	Assets and Liabilities Measured at Fair Value on a Recurring Basis Valuation Hierarchy: The Account’s fair value measurements are grouped into three levels, as defined by the FASB. The levels are defined as follows: • Level 1 fair value inputs are quoted prices for identical items in active, liquid and visible markets such as stock exchanges. • Level 2 fair value inputs are observable information for similar items in active or inactive markets, and appropriately consider counterparty creditworthiness in the valuations. • Level 3 fair value inputs reflect our best estimate of inputs and assumptions market participants would use in pricing an asset or liability at the measurement date. The inputs are unobservable in the market and significant to the valuation estimate. An investment’s categorization within the valuation hierarchy described above is based upon the lowest level of input that is significant to the fair value measurement. Real estate fund investments are excluded from the valuation hierarchy, as these investments are fair valued using their net asset value as a practical expedient since market quotations or values from independent pricing services are not readily available. See Note 1 — Organization and Significant Accounting Policies for further discussion regarding the use of a practical expedient for the valuation of real estate funds. The Account’s determination of fair value is based upon quoted market prices, where available. If listed prices or quotes are not available, fair value is based upon vendor-provided, evaluated prices or internally developed models that primarily use market-based or independently sourced market data, including interest rate yield curves, market spreads, and currency rates. Valuation adjustments will be made to reflect changes in credit quality, a counterparty’s creditworthiness, the Account’s creditworthiness, liquidity, and other observable and unobservable inputs that are applied consistently over time. The methods described above are considered to produce fair values that represent an estimate by management of what an unaffiliated buyer in the marketplace would pay to purchase the asset or would receive to transfer the liability. Since fair value calculations involve significant professional judgment in the application of both observable and unobservable attributes, actual realizable values or future fair values may differ from amounts reported. Furthermore, while the Account believes its valuation methods are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments, while reasonable, could result in different estimates of fair value at the reporting date. As discussed in Note 1 — Organization and Significant Accounting Policies in more detail, the Account generally obtains independent third party appraisals on a quarterly basis, and there may be circumstances in the interim in which the true realizable value of a property is not reflected in the Account’s daily net asset value calculation or in the Account’s periodic Consolidated Financial Statements. This disparity may be more apparent when the commercial and/or residential real estate markets experience an overall and possibly dramatic decline (or increase) in property values in a relatively short period of time between appraisals. The following tables show the major categories of assets and liabilities measured at fair value on a recurring basis as of June 30, 2020 (unaudited) and December 31, 2019 , using unadjusted quoted prices in active markets for identical assets (Level 1); significant other observable inputs (Level 2); and significant unobservable inputs (Level 3); and fair value using the practical expedient (millions): Description Level 1: Quoted Prices in Active Markets for Identical Assets Level 2: Significant Other Observable Inputs Level 3: Significant Unobservable Inputs Fair Value Using Practical Expedient Total at Real estate properties $ — $ — $ 16,748.6 $ — $ 16,748.6 Real estate joint ventures — — 6,024.6 — 6,024.6 Real estate funds — — — 340.7 340.7 Marketable securities: Real estate-related 838.4 — — — 838.4 Government agency notes — 15.0 — — 15.0 United States Treasury securities — 1,374.7 — — 1,374.7 Loans receivable (1) — — 1,578.2 — 1,578.2 Total Investments at $ 838.4 $ 1,389.7 $ 24,351.4 $ 340.7 $ 26,920.2 Loans payable $ — $ — $ (2,457.0 ) $ — $ (2,457.0 ) Line of credit $ — $ — $ (291.0 ) $ — $ (291.0 ) Description Level 1: Quoted Prices in Active Markets for Identical Assets Level 2: Significant Other Observable Inputs Level 3: Significant Unobservable Inputs Fair Value Using Practical Expedient Total at December 31, 2019 Real estate properties $ — $ — $ 15,835.0 $ — $ 15,835.0 Real estate joint ventures — — 7,204.2 — 7,204.2 Real estate funds — — — 311.8 311.8 Marketable securities: Real estate-related 825.7 — — — 825.7 Government agency notes — 259.6 — — 259.6 United States Treasury securities — 2,589.1 — — 2,589.1 Corporate bonds — 1,268.3 — — 1,268.3 Municipal bonds — 33.2 — — 33.2 Loans receivable (1) — — 1,572.1 — 1,572.1 Total Investments at December 31, 2019 $ 825.7 $ 4,150.2 $ 24,611.3 $ 311.8 $ 29,899.0 Loans payable $ — $ — $ (2,365.0 ) $ — $ (2,365.0 ) Line of credit $ — $ — $ (250.0 ) $ — $ (250.0 ) (1) Amount shown is reflective of loans receivable and loans receivable with related parties. The following tables show the reconciliation of the beginning and ending balances for assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) during the three and six months ended June 30, 2020 and 2019 (millions, unaudited): Real Estate Real Estate Loans (3) Total Loans Line of Credit For the three months ended June 30, 2020 Beginning balance April 1, 2020 $ 17,082.1 $ 6,237.4 $ 1,631.0 $ 24,950.5 $ (2,605.6 ) $ (190.0 ) Total realized and unrealized losses included in changes in net assets (379.4 ) (220.1 ) (11.1 ) (610.6 ) (9.4 ) — Purchases (1) 51.7 21.4 2.3 75.4 — (140.0 ) Sales (5.8 ) — (40.0 ) (45.8 ) — — Settlements (2) — (14.1 ) (4.0 ) (18.1 ) 158.0 39.0 Ending balance June 30, 2020 $ 16,748.6 $ 6,024.6 $ 1,578.2 $ 24,351.4 $ (2,457.0 ) $ (291.0 ) Real Estate Real Estate Loans (3) Total Loans Line of Credit For the six months ended June 30, 2020 Beginning balance January 1, 2020 $ 15,835.0 $ 7,204.2 $ 1,572.1 $ 24,611.3 $ (2,365.0 ) $ (250.0 ) Total realized and unrealized gains (losses) included in changes in net assets (241.9 ) (376.5 ) (23.8 ) (642.2 ) 36.3 — Purchases (1) 1,508.9 42.0 111.3 1,662.2 (289.6 ) (540.0 ) Sales (353.4 ) — (64.7 ) (418.1 ) — — Settlements (2) — (845.1 ) (16.7 ) (861.8 ) 161.3 499.0 Ending balance June 30, 2020 $ 16,748.6 $ 6,024.6 $ 1,578.2 $ 24,351.4 $ (2,457.0 ) $ (291.0 ) Real Estate Real Estate Loans (3) Total Line of Credit For the three months ended June 30, 2019 Beginning balance April 1, 2019 $ 15,968.6 $ 6,420.4 $ 967.3 $ 23,356.3 $ (2,632.9 ) $ — Total realized and unrealized gains (losses) included in changes in net assets 170.3 (20.7 ) (4.0 ) 145.6 (36.7 ) — Purchases (1) 333.0 326.8 144.6 804.4 (110.0 ) — Sales — — — — — — Settlements (2) — (6.2 ) (2.8 ) (9.0 ) 4.9 — Ending balance June 30, 2019 $ 16,471.9 $ 6,720.3 $ 1,105.1 $ 24,297.3 $ (2,774.7 ) $ — Real Estate Real Estate Loans (3) Total Line of Credit For the six months ended June 30, 2019 Beginning balance January 1, 2019 $ 15,531.1 $ 6,356.6 $ 913.0 $ 22,800.7 $ (2,608.0 ) $ — Total realized and unrealized gains (losses) included in changes in net assets 244.2 (13.6 ) (2.8 ) 227.8 (66.3 ) — Purchases (1) 699.7 383.9 219.0 1,302.6 (110.0 ) — Sales (3.1 ) — — (3.1 ) — — Settlements (2) — (6.6 ) (24.1 ) (30.7 ) 9.6 — Ending balance June 30, 2019 $ 16,471.9 $ 6,720.3 $ 1,105.1 $ 24,297.3 $ (2,774.7 ) $ — (1) Includes purchases, contributions for joint ventures, capital expenditures, lending for loans receivable and assumption of loans payable. (2) Includes operating income for real estate joint ventures net of distributions, principal payments and payoffs of loans receivable, and principal payments and extinguishment of loans payable. (3) Amount shown is reflective of loans receivable and loans receivable with related parties. The following table shows quantitative information about unobservable inputs related to the Level 3 fair value measurements as of June 30, 2020 (unaudited). Type Asset Class Valuation Unobservable Range (Weighted Average) Real Estate Properties and Joint Ventures Office Income Approach—Discounted Cash Flow Discount Rate 5.5% - 8.5% (6.6%) Income Approach—Direct Capitalization Overall Capitalization Rate 3.9% - 7.2% (5.0%) Industrial Income Approach—Discounted Cash Flow Discount Rate 5.2% - 9.3% (6.7%) Income Approach—Direct Capitalization Overall Capitalization Rate 3.5% - 7.6% (4.8%) Apartment Income Approach—Discounted Cash Flow Discount Rate 5.3% - 7.8% (6.4%) Income Approach—Direct Capitalization Overall Capitalization Rate 3.8% - 6.0% (4.6%) Retail Income Approach—Discounted Cash Flow Discount Rate 5.3% - 11.8% (6.7%) Income Approach—Direct Capitalization Overall Capitalization Rate 4.3% - 11.5% (5.1%) Hotel Income Approach—Discounted Cash Flow Discount Rate 10.3% (10.3%) 7.8% (7.8%) Income Approach—Direct Capitalization Overall Capitalization Rate 7.5% (7.5%) Loans Payable Office and Industrial Discounted Cash Flow Loan to Value Ratio 31.9% - 59.2% (46.0%) Net Present Value Loan to Value Ratio 31.9% - 59.2% (46.0%) Apartment Discounted Cash Flow Loan to Value Ratio 31.2% - 69.0% (48.1%) Net Present Value Loan to Value Ratio 31.2% - 69.0% (48.1%) Retail Discounted Cash Flow Loan to Value Ratio 41.0% - 65.1% (46.2%) Net Present Value Loan to Value Ratio 41.0% - 65.1% (46.2%) Loans Receivable, including those with related parties Apartment, Hotel, Industrial, Office, Retail and Storage Discounted Cash Flow Loan to Value Ratio 31.7% - 88.5% (71.3%) The following table shows quantitative information about unobservable inputs related to the Level 3 fair value measurements as of June 30, 2019 (unaudited). Type Asset Class Valuation Unobservable Range (Weighted Average) Real Estate Properties and Joint Ventures Office Income Approach—Discounted Cash Flow Discount Rate 5.5% - 8.6% (6.6%) Income Approach—Direct Capitalization Overall Capitalization Rate 3.5% - 7.0% (4.9%) Industrial Income Approach—Discounted Cash Flow Discount Rate 5.3% - 9.3% (6.7%) Income Approach—Direct Capitalization Overall Capitalization Rate 3.9% - 7.8% (4.9%) Apartment Income Approach—Discounted Cash Flow Discount Rate 5.5% - 7.8% (6.4%) Income Approach—Direct Capitalization Overall Capitalization Rate 3.3% - 6.0% (4.5%) Retail Income Approach—Discounted Cash Flow Discount Rate 5.0% - 10.7% (6.5%) Income Approach—Direct Capitalization Overall Capitalization Rate 3.3% - 10.5% (4.8%) Loans Payable Office and Industrial Discounted Cash Flow Loan to Value Ratio 34.7% - 60.4% (47.3%) Net Present Value Loan to Value Ratio 34.7% - 60.4% (47.3%) Apartment Discounted Cash Flow Loan to Value Ratio 31.4% - 62.0% (48.1%) Net Present Value Loan to Value Ratio 31.4% - 62.0% (48.1%) Retail Discounted Cash Flow Loan to Value Ratio 32.0% - 63.3% (39.6%) Net Present Value Loan to Value Ratio 32.0% - 63.3% (39.6%) Loans Receivable Office, Retail and Storage Discounted Cash Flow Loan to Value Ratio 69.3% - 86.2% (77.6%) Real Estate Properties and Joint Ventures: The significant unobservable inputs used in the fair value measurement of the Account’s real estate property and joint venture investments are the selection of certain investment rates (Discount Rate, Terminal Capitalization Rate, and Overall Capitalization Rate). Significant increases (decreases) in any of those inputs in isolation would result in significantly lower (higher) fair value measurements, respectively. Loans Payable: The significant unobservable inputs used in the fair value measurement of the Account’s loans payable are the loan to value ratios and the selection of certain credit spreads and weighted average cost of capital risk premiums. Significant increases (decreases) in any of those inputs in isolation would result in a significantly lower (higher) fair value, respectively. Loans Receivable: The significant unobservable inputs used in the fair value measurement of the Account’s loans receivable are the loan to value ratios and the selection of certain credit spreads. Significant increases (decreases) in any of those inputs in isolation would result in a significantly lower (higher) fair value, respectively. During the six months ended June 30, 2020 and 2019 , there were no transfers between Levels 1, 2 or 3. The amount of total net unrealized gains (losses) included in changes in net assets attributable to the change in net unrealized gains (losses) relating to Level 3 investments and loans payable using significant unobservable inputs still held as of the reporting date is as follows (millions, unaudited): Real Estate Properties Real Estate Joint Ventures Loans Receivable (1) Total Level 3 Investments Loans Payable For the three months ended June 30, 2020 $ (380.6 ) $ (255.6 ) $ (11.1 ) $ (647.3 ) $ (9.4 ) For the six months ended June 30, 2020 $ (232.9 ) $ (318.2 ) $ (22.2 ) $ (573.3 ) $ 36.3 For the three months ended June 30, 2019 $ 170.3 $ (14.7 ) $ (4.0 ) $ 151.6 $ (36.7 ) For the six months ended June 30, 2019 $ 244.2 $ (12.2 ) $ (2.8 ) $ 229.2 $ (66.3 ) (1) Amount shown is reflective of loans receivable and loans receivable with related parties.

Investments in Joint Ventures

Investments in Joint Ventures	6 Months Ended
	Jun. 30, 2020
Equity Method Investments and Joint Ventures [Abstract]
Investments in Joint Ventures	Investments in Joint Ventures The Account owns interests in several real estate properties through joint ventures and receives distributions and allocations of profits and losses from the joint ventures based on the Account’s ownership interest in those investments. Several of these joint ventures have loans payable collateralized by the properties owned by the aforementioned joint ventures. At June 30, 2020 , the Account held investments in joint ventures with ownership interest percentages that ranged from 33.3% to 98.0% . Certain joint ventures are subject to adjusted distribution percentages when earnings in the investment reach a pre-determined threshold. A condensed summary of the results of operations of the joint ventures are shown below (millions, unaudited): For the Three Months Ended June 30, For the Six Months Ended June 30, 2020 2019 2020 2019 Operating Revenue and Expenses Revenues $ 250.8 $ 271.8 $ 536.3 $ 537.9 Expenses 145.3 149.4 299.9 294.7 Excess of revenues over expenses $ 105.5 $ 122.4 $ 236.4 $ 243.2

Investments in Real Estate Fund

Investments in Real Estate Funds	6 Months Ended
	Jun. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Investments in Real Estate Funds	Investments in Real Estate Funds The Account has ownership interests in real estate funds (each a "Fund", and collectively the "Funds"). The Funds are setup as limited partnerships or entities similar to a limited partnership, and as such, meet the definition of a VIE as the limited partners collectively lack the power, through voting or similar rights, to direct the activities of the Fund that most significantly impact the Fund's economic performance. Management has determined that the Account is not the primary beneficiary for any of the Funds, as the Account lacks the power to direct the activities of each Fund that most significantly impact the respective Fund's economic performance, and the Account further lacks substantive kick-out rights to remove the entity with these powers. Refer to Note 1—Organization and Significant Accounting Policies for a description of the methodology used to determine the primary beneficiary of a VIE. No financial support (such as loans or financial guarantees) was provided to the Funds during the three and six months ended June 30, 2020 . The Account is contractually obligated to make additional capital contributions in certain Funds in future years. These commitments are identified in Note 13—Commitments and Contingencies . The carrying amount and maximum exposure to loss relating to unconsolidated VIEs in which the Company holds a significant variable interest but is not the primary beneficiary were as follows at June 30, 2020 (in millions, unaudited): Fund Name Carrying Amount Maximum Exposure to Loss Liquidity Provisions Investment Strategy LCS SHIP Venture I, LLC (90.0% Account Interest) $ 193.8 $ 193.8 Redemptions prohibited prior to liquidation. To invest in senior housing properties. Liquidation estimated to begin no earlier than 2025. The Account is permitted to sell or transfer its interest in the fund, subject to consent and approval of the manager. SP V - II, LLC (61.8% Account Interest) $ 27.0 $ 27.0 Redemptions prohibited prior to liquidation. To invest in medical office properties in the U.S. Liquidation estimated to begin no earlier than 2022. The Account is permitted to sell or transfer its interest in the fund, subject to consent and approval of the manager. Taconic New York City GP Fund, LP (60.0% Account Interest) $ 31.9 $ 31.9 Redemptions prohibited prior to liquidation. To invest in real estate and real estate-related assets in the New York City metropolitan statistical area ("MSA"). Liquidation estimated to begin no earlier than 2024. The Account is permitted to sell its interest in the fund, subject to consent and approval of the general partner. Veritas - Trophy VI, LLC (90.4% Account Interest) $ 43.5 $ 43.5 Redemptions prohibited prior to liquidation. To invest in multi-family properties primarily in the San Francisco Bay and Los Angeles MSA. The Account is not permitted to sell or transfer its interest in the fund until August 2022. After this date, the Account can sell or transfer its interest in the fund with the consent and approval of the manager. IDR - Core Property Index Fund, LLC (1.6% Account Interest) $ 25.2 $ 25.2 Redemptions are permitted for a full calendar quarter and upon at least 90 days prior written notice, subject to fund availability. To invest primarily in open-ended funds that fall within the NFI-ODCE Index and are actively managed. The Account is permitted to sell its interest in the fund, subject to consent and approval of the manager. Grubb Southeast Real Estate Fund VI, LLC (66.7% Account Interest) $ 15.6 $ 15.6 Redemptions prohibited prior to liquidation. To acquire office investments across the Southeast. Liquidation estimated to begin no earlier than 2026. The Account is not permitted to sell or transfer its interest in the fund until June 2021. After this date, the Account can sell or transfer its interest in the fund with the consent and approval of the manager. JCR Capital - REA Preferred Equity Parallel Fund (49.2% Account Interest) $ 3.7 $ 3.7 Redemptions prohibited prior to liquidation. To invest primarily in multi-family properties. Liquidation estimated to begin no earlier than 2026. The Account is prohibited from transferring its interest in the fund without consent by the general partner, which can be withheld in their sole discretion Total $ 340.7 $ 340.7

Loans Receivable

Loans Receivable	6 Months Ended
	Jun. 30, 2020
Receivables [Abstract]
Loans Receivable	Loans Receivable The Account’s loan receivable portfolio is primarily comprised of mezzanine loans secured by the borrower’s direct and indirect interests in commercial real estate. Mezzanine loans are subordinate to first mortgages on the underlying real estate collateral. The following property types represent the underlying real estate collateral for the Account's mezzanine loans (millions): June 30, 2020 December 31, 2019 (Unaudited) Principal Outstanding Fair Value % of Fair Value Principal Outstanding Fair Value % of Fair Value Office (1) $ 787.5 $ 781.7 49.5 % $ 769.3 $ 768.0 48.8 % Industrial 195.7 195.7 12.4 % 199.6 199.6 12.7 % Retail 139.4 136.9 8.7 % 158.5 158.5 10.1 % Storage 82.0 73.8 4.7 % 82.0 82.0 5.2 % Apartments (1) 262.2 260.2 16.5 % 229.1 228.8 14.6 % Hotel 135.3 129.9 8.2 % 135.3 135.2 8.6 % $ 1,602.1 $ 1,578.2 100.0 % $ 1,573.8 $ 1,572.1 100.0 % (1) Includes loans receivable with related parties. The Account monitors the risk profile of the loan receivable portfolio with the assistance of a third-party rating service that models the loans and assigns risk ratings based on inputs such as loan-to-value ratios, yields, credit quality of the borrowers, property types of the collateral, geographic and local market dynamics, physical condition of the collateral, and the underlying structure of the loans. Ratings for loans are updated monthly. Assigned ratings can range from AAA to C, with a AAA designation representing debt with the lowest level of credit risk and C representing a greater risk of default or principal loss. Loans that are more than 90 days past due are classified as delinquent and assigned a D rating. Mezzanine debt in good health is typically reflective of a risk rating in the B range (e.g., BBB, BB, or B), as these ratings reflect borrowers' having adequate financial resources to service their financial commitments, but also acknowledging that adverse economic conditions, should they occur, would likely impede on a borrowers' ability to pay. All borrowers of loans rated B or higher are current as of June 30, 2020. The following table presents the fair values of the Account's loan portfolio based on the risk ratings as of June 30, 2020 (in millions, unaudited), listed in order of the strength of the risk rating (from strongest to weakest): June 30, 2020 December 31, 2019 (Unaudited) Number of Loans Fair Value % of Fair Value Number of Loans Fair Value % of Fair Value A 1 $ 76.8 4.9 % 1 $ 48.3 3.1 % BBB 2 65.7 4.2 % 7 456.1 29.0 % BB 15 930.3 58.8 % 13 787.4 50.1 % B 6 362.6 23.0 % 3 205.0 13.0 % D 1 73.8 4.7 % — — — % NR (1) 2 69.0 4.4 % 3 75.3 4.8 % 27 $ 1,578.2 100.0 % 27 $ 1,572.1 100.0 % (1) "NR" designates loans not assigned an internal credit rating. As of June 30, 2020 and December 31, 2019, this is comprised of two loans with related parties. The loans are collateralized by equity interests in real estate investments. The following table represents loans receivable in nonaccrual status as of June 30, 2020 (in millions, unaudited). Loans are placed in nonaccrual status when a loan is more than 90 days in arrears or at any point when management believes the full collection of principal is doubtful. Aging Number of Loans Principal Outstanding Fair Value Past Due - 90 Days + 1 $ 82.0 $ 73.8

Loans Payable

Loans Payable	6 Months Ended
	Jun. 30, 2020
Debt Disclosure [Abstract]
Loans Payable	Loans Payable At June 30, 2020 , the Account had outstanding loans payable secured by the following assets (millions): Property Annual Interest Rate and (2) Principal Maturity June 30, 2020 December 31, 2019 (Unaudited) Red Canyon at Palomino Park 5.34% paid monthly $ — $ 27.1 August 1, 2020 Green River at Palomino Park 5.34% paid monthly — 33.2 August 1, 2020 Blue Ridge at Palomino Park 5.34% paid monthly — 33.4 August 1, 2020 Ashford Meadows Apartments 5.17% paid monthly — 44.6 August 1, 2020 The Knoll 3.98% paid monthly — 16.4 December 5, 2020 Ascent at Windward 3.51% paid monthly 34.6 34.6 January 1, 2022 The Palatine (1) 4.25% paid monthly 75.1 75.9 January 10, 2022 The Forum at Carlsbad (1) 4.25% paid monthly 84.8 85.7 March 1, 2022 Fusion 1560 3.42% paid monthly 37.4 37.4 June 10, 2022 San Diego Office Portfolio (4) 3.62% paid monthly 49.7 48.2 August 15, 2022 The Colorado (1) 3.69% paid monthly 87.3 88.1 November 1, 2022 The Legacy at Westwood (1) 3.69% paid monthly 44.5 44.9 November 1, 2022 Regents Court (1) 3.69% paid monthly 37.7 38.1 November 1, 2022 1001 Pennsylvania Avenue (1) 3.70% paid monthly 317.5 320.7 June 1, 2023 Biltmore at Midtown 3.94% paid monthly 36.4 36.4 July 5, 2023 Cherry Knoll 3.78% paid monthly 35.3 35.3 July 5, 2023 Lofts at SoDo 3.94% paid monthly 35.1 35.1 July 5, 2023 Pacific City 2.00% + LIBOR paid monthly 105.0 — October 1, 2023 Birkdale Village (1) 4.30% paid monthly 77.9 — April 1, 2024 1401 H Street, NW 3.65% paid monthly 115.0 115.0 November 5, 2024 The District at La Frontera (1) 3.84% paid monthly 39.0 39.3 December 1, 2024 The District at La Frontera (1) 4.96% paid monthly 4.3 4.4 December 1, 2024 Circa Green Lake 3.71% paid monthly 52.0 52.0 March 5, 2025 Union - South Lake Union 3.66% paid monthly 57.0 57.0 March 5, 2025 Holly Street Village 3.65% paid monthly 81.0 81.0 May 1, 2025 Henley at Kingstowne 3.60% paid monthly 71.0 71.0 May 1, 2025 32 South State Street 4.48% paid monthly 24.0 24.0 June 6, 2025 Vista Station Office Portfolio (1) 4.00% paid monthly 20.2 20.5 July 1, 2025 780 Third Avenue 3.55% paid monthly 150.0 150.0 August 1, 2025 780 Third Avenue 3.55% paid monthly 20.0 20.0 August 1, 2025 Vista Station Office Portfolio (1) 4.20% paid monthly 44.3 44.7 November 1, 2025 701 Brickell Avenue 3.66% paid monthly 184.0 184.0 April 1, 2026 Marketplace at Mill Creek 3.82% paid monthly 39.6 — September 11, 2027 Overlook At King Of Prussia 3.82% paid monthly 40.8 — September 11, 2027 Winslow Bay 3.82% paid monthly 25.8 — September 11, 2027 1900 K Street, NW 3.93% paid monthly 163.0 163.0 April 1, 2028 99 High Street 3.90% paid monthly 277.0 277.0 March 1, 2030 Total Principal Outstanding $ 2,466.3 $ 2,338.0 Fair Value Adjustment (3) (9.3 ) 27.0 Total Loans Payable $ 2,457.0 $ 2,365.0 (1) The mortgage is adjusted monthly for principal payments. (2) All interest rates are fixed except for Pacific City, which has a variable interest rate based on a spread above the one month London Interbank Offered Rate, as published by ICE Benchmark Administration Limited. Some mortgages held by the Account are structured to begin principal and interest payments after an initial interest only period. (3) The fair value adjustment consists of the difference (positive or negative) between the principal amount of the outstanding debt and the fair value of the outstanding debt. See Note 1—Organization and Significant Accounting Policies. (4) The loan is collateralized by a mezzanine loan receivable. The mezzanine loan receivable is collateralized by the property reflected within the table above.

Line of Credit

Line of Credit	6 Months Ended
	Jun. 30, 2020
Debt Disclosure [Abstract]
Line of Credit	Line of Credit On September 20, 2018, the Account entered into a $500.0 million unsecured revolving credit agreement (“Line of Credit”) syndicated across four national banks (each a “Lender”, and collectively the "Lenders"), with each Lender providing a $125.0 million commitment. Access to the Line of Credit expires on September 20, 2021, with an option to extend the Line of Credit for two consecutive twelve months terms at the Account’s election. The Account may request an additional $250.0 million in commitments from the Lenders at any time; however, this request is subject to approval at the sole discretion of the Lenders and is not a guarantee that an expansion beyond the original $500.0 million commitment will be granted. Draws against the Line of Credit can take the form of Eurodollar Loans or Alternate Base Rate Loans (“ABR Loans”). Eurodollar Loans and ABR Loans both require a minimum funding of $5.0 million . The Account is charged a fee of 0.20% per annum on the unused portion of the Line of Credit. For the three and six months ended June 30, 2020 , $0.8 million and $ 1.6 million was charged to the Account for expenses related to the Line of Credit, respectively. Eurodollar Loans are issued for a term of twelve months or less and bear interest during the period (“Interest Period”) at a rate equal to the Adjusted London Interbank Offered Rate (“Adjusted LIBOR”) plus a spread ranging between 0.85% - 1.05% per annum (the “Applicable Rate”), with the spread dependent upon the leverage ratio of the Account. The Adjusted LIBOR rate is calculated by multiplying the Statutory Reserve Rate, as determined by the Federal Reserve Board for Eurodollar liabilities, by the LIBOR rate, as determined by the Intercontinental Exchange on the date of issuance that corresponds to the length of the Interest Period of the Eurodollar Loan. The Account may prepay Eurodollar Loans at any time during the life of the loan without penalty. The Account is limited to five active Eurodollar Loans through the Line of Credit; however, the Account may retire and initiate new Eurodollar Loans without restriction so long as the total number of loans in active status never exceeds the limit. ABR Loans are issued for a specific length of time and bear interest at a rate equal to the highest rate among the following calculations plus the Applicable Rate: (i) the Prime Rate on the date of issuance, with the Prime Rate being defined as the rate of interest last quoted by the Wall Street Journal as the Prime Rate; (ii) the Federal Reserve Bank of New York (“NYFRB”) rate as provided by the NYFRB on the date of issuance plus 0.5% ; or (iii) the Adjusted LIBOR rate plus 1.0% . The Account may prepay ABR Loans at any time during the life of the loan without penalty. As of June 30, 2020 , the Account had $291.0 million outstanding on the Line of Credit and was in compliance with all covenants required by the Line of Credit.

Financial Highlights

Financial Highlights	6 Months Ended
	Jun. 30, 2020
Condensed Financial Information Disclosure [Abstract]
Financial Highlights	Financial Highlights Selected condensed financial information for an Accumulation Unit of the Account is presented below. Per Accumulation Unit data is calculated on average units outstanding. For the Six Months Ended June 30, 2020 Years Ended December 31, 2019 2018 2017 (Unaudited) Per Accumulation Unit Data: Rental income $ 10.598 $ 18.165 $ 17.757 $ 17.132 Real estate property level expenses and taxes 4.926 8.734 8.548 7.722 Real estate income, net 5.672 9.431 9.209 9.410 Other income 2.650 6.752 6.162 4.762 Total income 8.322 16.183 15.371 14.172 Expense charges (1) 1.691 3.439 3.161 3.318 Investment income, net 6.631 12.744 12.210 10.854 Net realized and unrealized gain on investments and loans payable (12.609 ) 10.262 6.877 5.839 Net increase in Accumulation Unit Value (5.978 ) 23.006 19.087 16.693 Accumulation Unit Value: Beginning of period 440.422 417.416 398.329 381.636 End of period $ 434.444 $ 440.422 $ 417.416 $ 398.329 Total return (3) (1.36 )% 5.51 % 4.79 % 4.37 % Ratios to Average net assets (2) : Expenses (1) 0.75 % 0.78 % 0.76 % 0.83 % Investment income, net 2.95 % 2.90 % 2.95 % 2.72 % Portfolio turnover rate (3) : Real estate properties (4) 5.6 % 7.8 % 11.8 % 2.7 % Marketable securities (5) 76.8 % 28.7 % 5.1 % 5.7 % Accumulation Units outstanding at end of period (millions) 54.5 60.8 60.7 61.3 Net assets end of period (millions) $ 24,212.8 $ 27,307.9 $ 25,842.6 $ 24,942.6 (1) Expense charges per Accumulation Unit and the Ratio of Expenses to average net assets reflect the year to date Account level expenses and exclude real estate property level expenses which are included in real estate income, net. (2) Percentages for the six months ended June 30, 2020 are annualized. (3) Percentages for the six months ended June 30, 2020 are not annualized. (4) Real estate investment portfolio turnover rate is calculated by dividing the lesser of purchases or sales of real estate property investments (including contributions to, or return of capital distributions received from, existing real estate joint ventures and fund investments) by the average value of the portfolio of real estate investments held during the period. (5) Marketable securities portfolio turnover rate is calculated by dividing the lesser of purchases or sales of securities, excluding securities having maturity dates at acquisition of one year or less, by the average value of the portfolio securities held during the period.

Accumulation Units

Accumulation Units	6 Months Ended
	Jun. 30, 2020
Accumulated Units Disclosure [Abstract]
Accumulation Units	Accumulation Units Changes in the number of Accumulation Units outstanding were as follows (in millions): For the Six Months Ended June 30, 2020 For the Year Ended December 31, 2019 (Unaudited) Outstanding: Beginning of period 60.8 60.7 Credited for premiums 2.6 6.2 Annuity, other periodic payments, withdrawals and death benefits (8.9 ) (6.1 ) End of period 54.5 60.8

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2020
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Commitments —As of June 30, 2020 and December 31, 2019, the Account had the following immediately callable commitments to purchase additional interests in its real estate funds or provide additional funding through its loans receivable investments: Commitment Expiration June 30, 2020 December 31, 2019 (Unaudited) Real Estate Funds (1) Taconic New York City GP Fund 11/2020 $ 6.0 $ 11.4 LCS SHIP Venture I, LLC 12/2020 28.1 28.1 Veritas Trophy VI, LLC (2) 08/2022 41.8 35.8 SP V - II, LLC 09/2022 73.8 74.9 Grubb Southeast Real Estate Fund VI, LLC 06/2021 83.6 86.6 JCR Capital - REA Preferred Equity Parallel Fund 12/2022 95.8 100.0 Townsend Strategic Ventures LP 03/2021 250.0 250.0 Silverpeak NRE Fund Co, LLC 01/2028 100.0 — TREA Flagler Venture, LLC 02/2025 100.0 — 779.1 586.8 Loans Receivable (3) 311 South Wacker Mezzanine 06/2021 $ 5.7 $ 7.6 Rosemont Towson Mezzanine 09/2021 1.2 1.2 1330 Broadway Mezzanine 09/2022 14.0 14.0 SCG Oakland Portfolio Mezzanine 03/2021 6.9 7.0 BREP VIII Industrial Mezzanine 03/2021 14.1 14.1 San Diego Office Portfolio Senior Loan 08/2022 8.5 10.0 San Diego Office Portfolio Mezzanine 08/2022 2.8 3.3 MRA Hub 34 Holding, LLC 09/2022 1.5 1.5 Liberty Park Mezzanine 11/2021 4.2 5.0 Colony New England Hotel Portfolio Senior Loan 11/2022 14.1 14.1 Colony New England Hotel Portfolio Mezzanine 11/2022 4.7 4.7 Exo Apartments Senior Loan 01/2023 7.1 7.1 Exo Apartments Mezzanine 01/2023 2.4 2.4 Five Oak Mezzanine 03/2023 2.4 — 89.6 92.0 TOTAL COMMITMENTS $ 868.7 $ 678.8 (1) Additional capital can be called during the commitment period at any time. The commitment period can only be extended by the manager with the consent of the Account. The commitment expiration date is reflective of the most recent signed agreement between the Account and the fund manager, including any side letter agreements. (2) The fund manager is granted 18 months from the initial contribution date, August 2019, to make its first capital call. If none have occurred, the Account's commitment will be reduced by $15.0 million . If a capital call occurs during the initial 18 month window, the commitment period will be modified to three years from the first capital call date. (3) Additional advances from the Account can be requested during the commitment period at any time. The commitment expiration date is reflective of the most recent signed agreement between the Account and the borrower, including any side letter agreements. Certain loans contain extension clauses on the term of the loan that do not require the Account's prior consent. If elected, the Account's commitment may be extended through the extension term. Contingencies —In the normal course of business, the Account may be named, from time to time, as a defendant or may be involved in various legal actions, including arbitrations, class actions and other litigation. The Account establishes an accrual for all litigation and regulatory matters when it believes it is probable that a loss has been incurred and the amount of the loss can be reasonably estimated. Once established, accruals are adjusted, as appropriate, in light of additional information. The amount of loss ultimately incurred in relation to those matters may be higher or lower than the amounts accrued for those matters. As of the date of this report, management of the Account does not believe that the results of any such claims or litigation, individually or in the aggregate, will have a material effect on the Account’s business, financial position or results of operations.

Organization and Significant _2

Organization and Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2020
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation: The accompanying Consolidated Financial Statements include the Account and those subsidiaries wholly-owned by TIAA for the sole benefit of the Account. All significant intercompany accounts and transactions between the Account and such subsidiaries have been eliminated. The Accumulation Unit Value (“AUV”) used for financial reporting purposes may differ from the AUV used for processing transactions. The AUV used for financial reporting purposes includes security and participant transactions effective through the period end date to which this report relates. Total return is computed based on the AUV used for processing transactions.
Determination of Investments at Fair Value	Determination of Investments at Fair Value: The Account reports all investments at fair value in accordance with the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) 946 —Financial Services—Investment Companies ("ASC 946") . Further in accordance with the adoption of the fair value option allowed under ASC 825 —Financial Instruments , and at the election of Account management, loans payable and a line of credit are reported at fair value. The FASB has defined fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants excluding transaction costs. The following is a description of the valuation methodologies used to determine the fair value of the Account’s investments and investment related loans payable. Valuation of Real Estate Properties —Investments in real estate properties are stated at fair value, as determined in accordance with policies and procedures reviewed by the Investment Committee of the Board and in accordance with the responsibilities of the Board as a whole. Accordingly, the Account does not record depreciation. Determination of fair value involves significant levels of judgment because the actual fair value of real estate can be determined only by negotiation between the parties in a sales transaction. The Account’s primary objective when valuing its real estate investments is to produce a valuation that represents a reasonable estimate of the fair value of its investments. Implicit in the Account’s definition of fair value are the consummation of a sale as of a specified date and the passing of title from seller to buyer under conditions whereby: • Buyer and seller are similarly motivated; • Both parties are well informed or well advised, and acting in what they consider their best interests; • A reasonable time is allowed for exposure in the open market; • Payment is made in terms of cash or in terms of financial arrangements comparable thereto; and • The price represents the normal consideration for the property sold unaffected by special or creative financing or sales concessions granted by anyone associated with the sale. Property and investment values are affected by, among other things, the availability of capital, occupancy rates, rental rates, and interest and inflation rates. As a result, determining real estate and investment values involves many assumptions. Key inputs and assumptions include rental income and expense amounts, related rental income and expense growth rates, capital expenditures, discount rates and capitalization rates. Valuation techniques include discounted cash flow analysis, prevailing market capitalization rates or multiples applied to earnings from the property, analysis of recent comparable sales transactions, actual sale negotiations and bona fide purchase offers received from third parties. Amounts ultimately realized from each investment may vary significantly from the fair value presented. Real estate properties owned by the Account are initially valued based on an independent third party appraisal, as reviewed by TIAA’s internal appraisal staff and as applicable by the Independent Fiduciary, RERC, LLC (the "Independent Fiduciary"), at the time of the closing of the purchase. Such initial valuation may result in a potential unrealized gain or loss reflecting the difference between an investment’s fair value (i.e., exit price) and its cost basis (which is inclusive of transaction costs). Subsequently, each property is appraised each quarter by an independent third party appraiser, reviewed by TIAA’s internal appraisal staff and as applicable the Account’s Independent Fiduciary. In general, the Account obtains appraisals of its real estate properties spread out throughout the quarter, which is intended to result in appraisal adjustments, and thus, adjustments to the valuations of its holdings (to the extent such adjustments are made) that happen regularly throughout each quarter and not on one specific day or month in each period. Further, management reserves the right to order an appraisal and/or conduct another valuation outside of the normal quarterly process when facts or circumstances at a specific property change. For example, under certain circumstances a valuation adjustment could be made when the account receives a bona fide bid for the sale of a property held within the Account or one of the Account’s joint ventures. Adjustments may be made for events or circumstances indicating an impairment of a tenant’s ability to pay amounts due to the Account under a lease (including due to a bankruptcy filing of that tenant). Alternatively, adjustments may be made to reflect the execution or renewal of a significant lease. Also, adjustments may be made to reflect factors (such as sales values for comparable properties or local employment rate) bearing uniquely on a particular region in which the Account holds properties. TIAA’s internal appraisal staff oversees the entire appraisal process, in conjunction with the Independent Fiduciary (the Independent Fiduciary is more fully described in the following paragraph). Any differences in the conclusions of TIAA’s internal appraisal staff and the independent appraiser will be reviewed by the Independent Fiduciary, which will make a final determination on the matter (which may include ordering a subsequent independent appraisal). The Independent Fiduciary was initially appointed in March 2006 by a special subcommittee of the Investment Committee of the Board to, among other things, oversee the entire appraisal process. In March 2018, RERC, LLC, was re-appointed as the Account's Independent Fiduciary for a term expiring in February 2021. The Independent Fiduciary must approve all independent appraisers used by the Account. All appraisals are performed in accordance with Uniform Standards of Professional Appraisal Practices, the real estate appraisal industry standards created by The Appraisal Foundation. Real estate appraisals are estimates of property values based on a professional’s opinion. Appraisals of properties held outside of the U.S. are performed in accordance with industry standards commonly applied in the applicable jurisdiction. These independent appraisers are always expected to be MAI-designated members of the Appraisal Institute (or its European equivalent, Royal Institute of Chartered Surveyors) and state certified appraisers from national or regional firms with relevant property type experience and market knowledge. Under the Account’s current procedures, each independent appraisal firm will be rotated off of a particular property at least every three years , although such appraisal firm may perform appraisals of other Account properties subsequent to such rotation. Also, the Independent Fiduciary may require additional appraisals if factors or events have occurred that could materially change a property’s value (including those identified previously) and such change is not reflected in the quarterly valuation review, or otherwise to ensure that the Account is valued appropriately. The Independent Fiduciary must also approve any valuation change of real estate-related assets where a property’s value changed by more than 6% from the most recent independent annual appraisal, or if the value of the Account would change by more than 4% within any calendar quarter or more than 2% since the prior calendar month. When a real estate property is subject to a mortgage, the property is valued independently of the mortgage and the property and mortgage fair values are reported separately (see Valuation of Loans Payable ). The Independent Fiduciary reviews and approves all mortgage valuation adjustments before such adjustments are recorded by the Account. The Account continues to use the revised value for each real estate property and mortgage loan payable to calculate the Account’s daily net asset value until the next valuation review or appraisal. Valuation of Real Estate Joint Ventures —Real estate joint ventures are stated at the fair value of the Account’s ownership interests of the underlying entities. The Account’s ownership interests are valued based on the fair value of the underlying real estate, any related loans payable, and other factors, such as ownership percentage, ownership rights, buy/sell agreements, distribution provisions and capital call obligations. The fair value of real estate and loans payable held by joint ventures is determined in the same manner described above in Valuation of Real Estate Properties. The Independent Fiduciary reviews and approves all valuation adjustments before such adjustments are recorded by the Account. Upon the disposition of all real estate investments by an investee entity, the Account will continue to state its equity in the remaining net assets of the investee entity during the wind down period, if any, which occurs prior to the dissolution of the investee entity. Valuation of Real Estate Funds —Real estate fund interests are stated at the fair value of the Account’s ownership in the real estate fund. Management uses net asset value information provided by limited partners as a practical expedient to estimate fair value. The Account receives estimates from limited partners on a quarterly basis, and audited information is provided annually. Upon receipt of the information, management reviews and determines whether the net asset values provided are an appropriate representation of the fair value of the Account's interests in the real estate funds and makes valuation adjustments as necessary. Valuation of real estate funds proceeds under the direction of the Investment Committee of the Board and in accordance with the responsibilities of the Board as a whole. Valuation of Marketable Securities —Equity securities listed or traded on any national market or exchange are valued at the last sale price as of the close of the principal securities market or exchange on which such securities are traded or, if there is no sale, at the mean of the last bid and asked prices on such market or exchange, exclusive of transaction costs . Valuation of Debt Securities —Debt securities with readily available market quotations, other than money market instruments, are generally valued at the most recent bid price or the equivalent quoted yield for such securities (or those of comparable maturity, quality and type). Debt securities for which market quotations are not readily available, are valued at fair value as determined by management and the Investment Committee of the Board and in accordance with the responsibilities of the Board as a whole. Short-term investments are valued in the same manner as debt securities, as described above. Money market instruments are valued at amortized cost, which approximates fair value. Valuation of Loans Receivable (i.e., the Account as a creditor) —Loans receivable are stated at fair value and are initially valued at the face amount of the loan funding. Subsequently, loans receivable are valued at least quarterly by TIAA’s internal valuation department based on market factors, such as market interest rates and spreads for comparable loans, the liquidity for loans of similar characteristics, the performance of the underlying collateral (such as the loan- to-value ratio and the cash flow of the underlying collateral) and the credit quality of the counterparty. The Independent Fiduciary reviews and approves all loan receivable valuation adjustments before such adjustments are recorded by the Account. The Account continues to use the revised value for each loan receivable to calculate the Account’s daily net asset value until the next valuation review. Valuation of Loans Payable (i.e., the Account as a debtor) —Mortgage or other loans payable, including the Account's line of credit, are stated at fair value. The estimated fair value of loans payable is generally based on the amount at which the liability could be transferred in a current transaction, exclusive of transaction costs. Fair values are estimated based on market factors, such as market interest rates and spreads on comparable loans, the liquidity for loans of similar characteristics, the performance of the underlying collateral (such as the loan-to-value ratio and the cash flow of the underlying collateral), the maturity date of the loan, the return demands of the market, and the credit quality of the Account. Different assumptions or changes in future market conditions could significantly affect estimated fair values. At times, the Account may assume debt in connection with the purchase of real estate (including under the Account's line of credit or additional credit facilities). The Independent Fiduciary reviews and approves all valuation adjustments before such adjustments are recorded by the Account.
Accumulation and Annuity Funds	Accumulation and Annuity Funds: The accumulation fund represents the net assets attributable to participants in the accumulation phase of their investment (“Accumulation Fund”). The annuity fund represents the net assets attributable to the participants currently receiving annuity payments (“Annuity Fund”). The net increase or decrease in net assets from investment operations is apportioned between the funds based upon their relative daily net asset values. Once an Account participant begins receiving lifetime annuity income benefits, payment levels cannot be reduced as a result of the Account’s actual mortality experience. In addition, the contracts pursuant to which the Account is offered are required to stipulate the maximum expense charge for all Account level expenses that can be assessed, which is not to exceed 2.5% of average net assets per year. The Account pays a fee to TIAA to assume mortality and expense risks.
Accounting for Investments	Accounting for Investments: The investments held by the Account are accounted for as follows: Real Estate Properties —Rent from real estate properties consists of all amounts earned under tenant leases, including base rent, recoveries of real estate taxes and other expenses and charges for miscellaneous services provided to tenants. Rental income is recognized in accordance with the billing terms of the lease agreements. The Account bears the direct expenses of the real estate properties owned. These expenses include, but are not limited to, fees to local property management companies, property taxes, utilities, maintenance, repairs, insurance, and other operating and administrative costs. An estimate of the net operating income earned from each real estate property is accrued by the Account on a daily basis and such estimates are adjusted when actual operating results are determined. Real Estate Joint Ventures —The Account has ownership interests in various real estate joint ventures (collectively, the “joint ventures”). The Account records its contributions as increases to its investments in the joint ventures, and distributions from the joint ventures are treated as income within income from real estate joint ventures and funds in the Account’s Consolidated Statements of Operations. Distributions that are identified as returns of capital are recorded as a reduction to the cost basis of the investment, whereas distributions identified as capital gains or losses are recorded as realized gains or losses. Income distributions from the joint ventures are recorded based on the Account’s proportional interest of the income distributed by the joint ventures. Income and losses incurred but not yet distributed or realized from the Account by the joint ventures are recorded as unrealized gains and losses. Real Estate Funds —The Account has limited ownership interests in various private real estate funds. The Account records its contributions as increases to the investments, and distributions from the investments are treated as income within income from real estate joint ventures and funds in the Account’s Consolidated Statements of Operations. Distributions that are identified as returns of capital are recorded as a reduction to the cost basis of the investment, whereas distributions identified as capital gains or losses are recorded as realized gains or losses. Unrealized gains and losses are recorded based upon the changes in the net asset values of the real estate funds as determined from the financial statements of the real estate funds when received by the Account. Prior to the receipt of the financial statements from the real estate funds, the Account estimates the value of its interest using information provided by the limited partners. Changes in value based on such estimates are recorded by the Account as unrealized gains and losses. Marketable Securities —Transactions in marketable securities are accounted for as of the date the securities are purchased or sold (trade date). Interest income is recorded as earned. Dividend income is recorded on the ex-dividend date within dividend income. Dividends that are identified as returns of capital are recorded as a reduction to the cost basis of the investment, whereas dividends identified as capital gains or losses are recorded as realized gains or losses. Realized gains and losses on securities transactions are accounted for on the specific identification method. Loans Receivable —The Account may originate, purchase or sell loans collateralized by real estate. The cost basis of originated loans is comprised of the principal balance and direct costs incurred that represent a component of the loan’s reported fair value. The cost basis of purchased loans consists of the purchase price of the loan and additional direct costs incurred that represent a component of the loan’s reported fair value. Additional costs incurred by the Account to originate or purchase loans that do not represent a component of a loan’s fair value are recorded as expenses in the period incurred. Nonrefundable origination fees paid by borrowers are recognized as interest income once all activities required to execute the loan are completed. Prepayment fees received from the payoff of loans in advance of their maturity date are recognized as interest income on the date the payoff occurs. Interest income from loans in accrual status is recognized based on the current coupon rate of the loans. Interest income accruals are suspended when a loan becomes a non-performing loan, defined as a loan more than ninety days in arrears or at any point when management believes the full collection of principal is doubtful. Interest income on non-performing loans is recognized only as cash payments are received. Loans can be rehabilitated to accrual status once all past due interest has been collected and management believes the full collection of principal is likely. Realized and Unrealized Gains and Losses —Realized gains and losses are recorded at the time an investment is sold or a distribution is received in relation to an investment sale from a real estate joint venture or fund. Real estate and loan receivable transactions are accounted for as of the date on which the purchase or sale transactions close (settlement date). The Account recognizes a realized gain on the sale of an investment to the extent that the contract sales price exceeds the cost-to-date of the investment being sold. A realized loss occurs when the cost-to-date exceeds the sales price. Realized gains and losses from partial sales of non-financial assets are recognized in accordance with ASC 610-20 - Gains and Losses from the Derecognition of Nonfinancial Assets . Realized gains and losses from the sale of financial assets are recognized in accordance with ASC 860 - Transfers and Servicing . Unrealized gains and losses are recorded as the fair values of the Account’s investments are adjusted, and as discussed within the Real Estate Joint Ventures, Real Estate Funds and Loans Receivable sections above. Unrealized gains and losses are recorded as the fair values of the Account’s investments are adjusted, and as discussed within the Real Estate Joint Ventures and Real Estate Funds sections above. Net Assets —The Account’s net assets as of the close of each valuation day are valued by taking the sum of: • the value of the Account’s cash, cash equivalents, and short-term and other debt instruments; • the value of the Account’s other securities and other non-real estate assets; • the value of the individual real properties (based on the most recent valuation of that property) and other real estate-related investments owned by the Account; • an estimate of the net operating income accrued by the Account from its properties, other real estate-related investments and non-real estate-related investments (including short-term marketable securities) since the end of the prior valuation day; and • actual net operating income earned from the Account’s properties, other real estate-related investments and non-real estate-related investments (but only to the extent any such item of income differs from the estimated income accrued for on such investments), and then reducing the sum by liabilities held within the Account, including the daily investment management fee, administration and distribution fees, mortality and expense fee, liquidity guarantee fee, and certain other expenses attributable to operating the Account. Daily estimates of net operating income are adjusted to reflect actual net operating income on a monthly basis, at which time such adjustments (if any) are reflected in the Account’s unit value. After the end of every quarter, the Account reconciles the amount of expenses deducted from the Account (which is established in order to approximate the costs that the Account will incur) with the expenses the Account actually incurred. If there is a difference, the Account adds it to or deducts it from the Account in equal daily installments over the remaining days of the following quarter. Material differences may be repaid in the current calendar quarter. The Account’s at cost deductions are based on projections of Account assets and overall expenses, and the size of any adjusting payments will be directly affected by the difference between management’s projections and the Account’s actual assets or expenses.
Cash and Cash Equivalents	Cash and Cash Equivalents: Cash and cash equivalents are balances held by the Account in bank deposit accounts which, at times, exceed federally insured limits. The Account’s management monitors these balances to mitigate the exposure of risk due to concentration and has not experienced any losses from such concentration.
Other Assets and Other Liabilities	Other Assets and Other Liabilities: Other assets and other liabilities consist of operating assets and liabilities utilized and held at each individual real estate property investment. Other assets consist of, amongst other items, cash, tenant receivables and prepaid expenses; whereas other liabilities primarily consist of security deposits. Other assets also include cash collateral held for securities on loan.
Federal Income Taxes	Federal Income Taxes: Based on provisions of Section 817 of the Internal Revenue Code of 1986, as amended, the Account is taxed as a segregated asset account of TIAA and as such, the Account incurs no material federal income tax attributable to the net investment activity of the Account. The Account’s federal income tax return is generally subject to examination for a period of three years after filed. State and local tax returns may be subject to examination for an additional period of time depending on the jurisdiction. Management has analyzed the Account’s tax positions taken for all open federal income tax years and has concluded that no provision for federal income tax is required in the Account’s Consolidated Financial Statements.
Restricted Cash	Restricted Cash:
Changes In Net Assets	Changes in Net Assets: Premiums include premiums paid by existing accumulation unit holders in the Account and transfers into the Account. Withdrawals and death benefits include withdrawals out of the Account which include transfers out of the Account and required minimum distributions.
Due to/from Investment Manager	Due to/from Investment Manager: Due to/from investment manager represents amounts that are to be paid or received by TIAA on behalf of the Account. Amounts generally are paid or received by the Account within one or two business days and no interest is contractually charged on these amounts.
Securities Lending	Securities Lending: The Account may lend securities to qualified borrowers to earn additional income. The Account receives cash collateral against the loaned securities and maintains cash collateral in an amount not less than 100% of the market value of loaned securities during the period of the loan; any additional collateral required due to changes in security values is delivered to the Account the next business day. Cash collateral received by the Account is invested exclusively in an interest-bearing deposit account. The value of the loaned securities and the liability to return the cash collateral received are reflected in the Consolidated Statements of Assets and Liabilities. When loaning securities, the Account retains the benefits of owning the securities, including the economic equivalent of dividends or interest generated by the securities. All income generated by the securities lending program is reflected within interest income on the Consolidated Statements of Operations. Securities lending transactions are for real estate-related equity securities, and the resulting loans are continuous, can be recalled at any time, and have no set maturity. Securities lending income recognized by the Account consists of interest earned on cash collateral and lending fees, net of any rebates to the borrower and compensation to the agent. Such income is reflected within interest income on the Consolidated Statements of Operations. In lending its securities, the Account bears the market risk with respect to the investment of collateral and the risk that the agent may default on its contractual obligations to the Account. The agent bears the risk that the borrower may default on its obligation to return the loaned securities as the agent is contractually obligated to indemnify the Account if at the time of a default by a borrower some or all of the loan securities have not been returned.

Related Party Transactions (Tab

Related Party Transactions (Tables)	6 Months Ended
	Jun. 30, 2020
Related Party Transactions [Abstract]
Schedule of Key Terms of the Loans	The following table presents the key terms of the loans as of the reporting date: Related Party Equity Ownership Interest Interest Rate Maturity Date Fair Value at Principal June 30, 2020 December 31, 2019 2020 2019 (Unaudited) 36.5 36.5 MRA Hub 34 Holding, LLC 95.00% 2.50% + LIBOR 9/1/2022 $ 36.5 $ 36.5 32.8 32.8 THP Student Housing, LLC 97.00% 3.200% 9/1/2024 32.5 32.5 TOTAL LOANS RECEIVABLE WITH RELATED PARTIES $ 69.0 $ 69.0

Concentrations of Risk (Tables)

Concentrations of Risk (Tables)	6 Months Ended
	Jun. 30, 2020
Risks and Uncertainties [Abstract]
Schedule of Diversification of Portfolio by Region and Property Type	The following table represents the diversification of the Account’s portfolio by region and property type as of June 30, 2020 (unaudited): Diversification by Fair Value (1) West East South Midwest Total Office 13.4 % 19.1 % 5.4 % — % 37.9 % Apartment 9.9 % 6.5 % 8.0 % 1.0 % 25.4 % Retail 6.7 % 3.8 % 7.6 % 0.9 % 19.0 % Industrial 9.3 % 1.6 % 4.7 % 0.5 % 16.1 % Other (2) 0.5 % 0.4 % 0.7 % — % 1.6 % Total 39.8 % 31.4 % 26.4 % 2.4 % 100.0 % (1) Wholly-owned properties are represented at fair value and gross of any debt, while joint venture properties are represented at the net equity value. (2) Represents interests in Storage Portfolio investments, a hotel investment and land. Properties in the “West” region are located in: AK, AZ, CA, CO, HI, ID, MT, NM, NV, OR, UT, WA, WY. Properties in the “East” region are located in: CT, DC, DE, KY, MA, MD, ME, NC, NH, NJ, NY, PA, RI, SC, VA, VT, WV. Properties in the “South” region are located in: AL, AR, FL, GA, LA, MS, OK, TN, TX. Properties in the “Midwest” region are located in: IA, IL, IN, KS, MI, MN, MO, ND, NE, OH, SD, WI.

Leases (Tables)

Leases (Tables)	6 Months Ended
	Jun. 30, 2020
Leases [Abstract]
Schedule of Aggregate Minimum Annual Rental Payments, After Adopting 842	Aggregate minimum annual rentals for wholly-owned real estate investments owned by the Account through the non-cancelable lease term, excluding short-term residential leases, as of June 30, 2020 (unaudited) and December 31, 2019 are as follows (millions): As of Years Ended June 30, 2020 December 31, 2019 2020 $ 327.2 (1) $ 550.4 2021 608.3 505.0 2022 527.8 442.1 2023 451.7 381.2 2024 374.5 316.6 Thereafter 1,246.0 1,078.4 Total $ 3,535.5 $ 3,273.7 (1) Representative of minimum rents owed for the remaining months of the calendar year ending December 31, 2020.
Schedule of Right-of-Use Assets and Lease Liabilities Related to Ground Leases	The fair values and key terms of the right-of-use assets and lease liabilities related to the Account's ground leases are as follows (millions): As of June 30, 2020 December 31, 2019 (Unaudited) Assets: Right-of-use assets, at fair value $ 35.1 $ 25.7 Liabilities: Ground lease liabilities, at fair value $ 35.1 $ 25.7 As of June 30, 2020 December 31, 2019 Key Terms: (Unaudited) Weighted-average remaining lease term (years) 67.9 84.4 Weighted-average discount rate (1) 7.81 % 6.15 % (1) Discount rates are reflective of the rates utilized during the most recent appraisal of the associated real estate investments.
Schedule of Aggregate Minimum Annual Payments for Ground Leases, After Adopting 842	Aggregate future minimum annual payments for ground leases held by the Account are as follows (millions): As of Years Ended June 30, 2020 December 31, 2019 (Unaudited) 2020 (1) $ 1.1 (1) $ 1.2 2021 2.3 1.2 2022 2.3 1.2 2023 2.3 1.2 2024 2.3 1.3 Thereafter 416.0 375.9 Total $ 426.3 $ 382.0 (1) Representative of minimum rents owed for the remaining months of the calendar year ending December 31, 2020.

Assets and Liabilities Measur_2

Assets and Liabilities Measured at Fair Value on a Recurring Basis (Tables)	6 Months Ended
	Jun. 30, 2020
Fair Value Disclosures [Abstract]
Schedule of Major Categories of Assets and Liabilities Measured at Fair Value on a Recurring Basis	The following tables show the major categories of assets and liabilities measured at fair value on a recurring basis as of June 30, 2020 (unaudited) and December 31, 2019 , using unadjusted quoted prices in active markets for identical assets (Level 1); significant other observable inputs (Level 2); and significant unobservable inputs (Level 3); and fair value using the practical expedient (millions): Description Level 1: Quoted Prices in Active Markets for Identical Assets Level 2: Significant Other Observable Inputs Level 3: Significant Unobservable Inputs Fair Value Using Practical Expedient Total at Real estate properties $ — $ — $ 16,748.6 $ — $ 16,748.6 Real estate joint ventures — — 6,024.6 — 6,024.6 Real estate funds — — — 340.7 340.7 Marketable securities: Real estate-related 838.4 — — — 838.4 Government agency notes — 15.0 — — 15.0 United States Treasury securities — 1,374.7 — — 1,374.7 Loans receivable (1) — — 1,578.2 — 1,578.2 Total Investments at $ 838.4 $ 1,389.7 $ 24,351.4 $ 340.7 $ 26,920.2 Loans payable $ — $ — $ (2,457.0 ) $ — $ (2,457.0 ) Line of credit $ — $ — $ (291.0 ) $ — $ (291.0 ) Description Level 1: Quoted Prices in Active Markets for Identical Assets Level 2: Significant Other Observable Inputs Level 3: Significant Unobservable Inputs Fair Value Using Practical Expedient Total at December 31, 2019 Real estate properties $ — $ — $ 15,835.0 $ — $ 15,835.0 Real estate joint ventures — — 7,204.2 — 7,204.2 Real estate funds — — — 311.8 311.8 Marketable securities: Real estate-related 825.7 — — — 825.7 Government agency notes — 259.6 — — 259.6 United States Treasury securities — 2,589.1 — — 2,589.1 Corporate bonds — 1,268.3 — — 1,268.3 Municipal bonds — 33.2 — — 33.2 Loans receivable (1) — — 1,572.1 — 1,572.1 Total Investments at December 31, 2019 $ 825.7 $ 4,150.2 $ 24,611.3 $ 311.8 $ 29,899.0 Loans payable $ — $ — $ (2,365.0 ) $ — $ (2,365.0 ) Line of credit $ — $ — $ (250.0 ) $ — $ (250.0 ) (1) Amount shown is reflective of loans receivable and loans receivable with related parties.
Schedule of Reconciliation of Assets Measured at Fair Value on Recurring Basis, Unobservable Inputs	The following tables show the reconciliation of the beginning and ending balances for assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) during the three and six months ended June 30, 2020 and 2019 (millions, unaudited): Real Estate Real Estate Loans (3) Total Loans Line of Credit For the three months ended June 30, 2020 Beginning balance April 1, 2020 $ 17,082.1 $ 6,237.4 $ 1,631.0 $ 24,950.5 $ (2,605.6 ) $ (190.0 ) Total realized and unrealized losses included in changes in net assets (379.4 ) (220.1 ) (11.1 ) (610.6 ) (9.4 ) — Purchases (1) 51.7 21.4 2.3 75.4 — (140.0 ) Sales (5.8 ) — (40.0 ) (45.8 ) — — Settlements (2) — (14.1 ) (4.0 ) (18.1 ) 158.0 39.0 Ending balance June 30, 2020 $ 16,748.6 $ 6,024.6 $ 1,578.2 $ 24,351.4 $ (2,457.0 ) $ (291.0 ) Real Estate Real Estate Loans (3) Total Loans Line of Credit For the six months ended June 30, 2020 Beginning balance January 1, 2020 $ 15,835.0 $ 7,204.2 $ 1,572.1 $ 24,611.3 $ (2,365.0 ) $ (250.0 ) Total realized and unrealized gains (losses) included in changes in net assets (241.9 ) (376.5 ) (23.8 ) (642.2 ) 36.3 — Purchases (1) 1,508.9 42.0 111.3 1,662.2 (289.6 ) (540.0 ) Sales (353.4 ) — (64.7 ) (418.1 ) — — Settlements (2) — (845.1 ) (16.7 ) (861.8 ) 161.3 499.0 Ending balance June 30, 2020 $ 16,748.6 $ 6,024.6 $ 1,578.2 $ 24,351.4 $ (2,457.0 ) $ (291.0 ) Real Estate Real Estate Loans (3) Total Line of Credit For the three months ended June 30, 2019 Beginning balance April 1, 2019 $ 15,968.6 $ 6,420.4 $ 967.3 $ 23,356.3 $ (2,632.9 ) $ — Total realized and unrealized gains (losses) included in changes in net assets 170.3 (20.7 ) (4.0 ) 145.6 (36.7 ) — Purchases (1) 333.0 326.8 144.6 804.4 (110.0 ) — Sales — — — — — — Settlements (2) — (6.2 ) (2.8 ) (9.0 ) 4.9 — Ending balance June 30, 2019 $ 16,471.9 $ 6,720.3 $ 1,105.1 $ 24,297.3 $ (2,774.7 ) $ — Real Estate Real Estate Loans (3) Total Line of Credit For the six months ended June 30, 2019 Beginning balance January 1, 2019 $ 15,531.1 $ 6,356.6 $ 913.0 $ 22,800.7 $ (2,608.0 ) $ — Total realized and unrealized gains (losses) included in changes in net assets 244.2 (13.6 ) (2.8 ) 227.8 (66.3 ) — Purchases (1) 699.7 383.9 219.0 1,302.6 (110.0 ) — Sales (3.1 ) — — (3.1 ) — — Settlements (2) — (6.6 ) (24.1 ) (30.7 ) 9.6 — Ending balance June 30, 2019 $ 16,471.9 $ 6,720.3 $ 1,105.1 $ 24,297.3 $ (2,774.7 ) $ — (1) Includes purchases, contributions for joint ventures, capital expenditures, lending for loans receivable and assumption of loans payable. (2) Includes operating income for real estate joint ventures net of distributions, principal payments and payoffs of loans receivable, and principal payments and extinguishment of loans payable. (3) Amount shown is reflective of loans receivable and loans receivable with related parties.
Schedule of Reconciliation of Liabilities Measured at Fair Value on Recurring Basis, Unobservable Inputs	The following tables show the reconciliation of the beginning and ending balances for assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) during the three and six months ended June 30, 2020 and 2019 (millions, unaudited): Real Estate Real Estate Loans (3) Total Loans Line of Credit For the three months ended June 30, 2020 Beginning balance April 1, 2020 $ 17,082.1 $ 6,237.4 $ 1,631.0 $ 24,950.5 $ (2,605.6 ) $ (190.0 ) Total realized and unrealized losses included in changes in net assets (379.4 ) (220.1 ) (11.1 ) (610.6 ) (9.4 ) — Purchases (1) 51.7 21.4 2.3 75.4 — (140.0 ) Sales (5.8 ) — (40.0 ) (45.8 ) — — Settlements (2) — (14.1 ) (4.0 ) (18.1 ) 158.0 39.0 Ending balance June 30, 2020 $ 16,748.6 $ 6,024.6 $ 1,578.2 $ 24,351.4 $ (2,457.0 ) $ (291.0 ) Real Estate Real Estate Loans (3) Total Loans Line of Credit For the six months ended June 30, 2020 Beginning balance January 1, 2020 $ 15,835.0 $ 7,204.2 $ 1,572.1 $ 24,611.3 $ (2,365.0 ) $ (250.0 ) Total realized and unrealized gains (losses) included in changes in net assets (241.9 ) (376.5 ) (23.8 ) (642.2 ) 36.3 — Purchases (1) 1,508.9 42.0 111.3 1,662.2 (289.6 ) (540.0 ) Sales (353.4 ) — (64.7 ) (418.1 ) — — Settlements (2) — (845.1 ) (16.7 ) (861.8 ) 161.3 499.0 Ending balance June 30, 2020 $ 16,748.6 $ 6,024.6 $ 1,578.2 $ 24,351.4 $ (2,457.0 ) $ (291.0 ) Real Estate Real Estate Loans (3) Total Line of Credit For the three months ended June 30, 2019 Beginning balance April 1, 2019 $ 15,968.6 $ 6,420.4 $ 967.3 $ 23,356.3 $ (2,632.9 ) $ — Total realized and unrealized gains (losses) included in changes in net assets 170.3 (20.7 ) (4.0 ) 145.6 (36.7 ) — Purchases (1) 333.0 326.8 144.6 804.4 (110.0 ) — Sales — — — — — — Settlements (2) — (6.2 ) (2.8 ) (9.0 ) 4.9 — Ending balance June 30, 2019 $ 16,471.9 $ 6,720.3 $ 1,105.1 $ 24,297.3 $ (2,774.7 ) $ — Real Estate Real Estate Loans (3) Total Line of Credit For the six months ended June 30, 2019 Beginning balance January 1, 2019 $ 15,531.1 $ 6,356.6 $ 913.0 $ 22,800.7 $ (2,608.0 ) $ — Total realized and unrealized gains (losses) included in changes in net assets 244.2 (13.6 ) (2.8 ) 227.8 (66.3 ) — Purchases (1) 699.7 383.9 219.0 1,302.6 (110.0 ) — Sales (3.1 ) — — (3.1 ) — — Settlements (2) — (6.6 ) (24.1 ) (30.7 ) 9.6 — Ending balance June 30, 2019 $ 16,471.9 $ 6,720.3 $ 1,105.1 $ 24,297.3 $ (2,774.7 ) $ — (1) Includes purchases, contributions for joint ventures, capital expenditures, lending for loans receivable and assumption of loans payable. (2) Includes operating income for real estate joint ventures net of distributions, principal payments and payoffs of loans receivable, and principal payments and extinguishment of loans payable. (3) Amount shown is reflective of loans receivable and loans receivable with related parties.
Schedule of Unobservable Inputs Related to Level 3 Fair Value Measurements	The following table shows quantitative information about unobservable inputs related to the Level 3 fair value measurements as of June 30, 2020 (unaudited). Type Asset Class Valuation Unobservable Range (Weighted Average) Real Estate Properties and Joint Ventures Office Income Approach—Discounted Cash Flow Discount Rate 5.5% - 8.5% (6.6%) Income Approach—Direct Capitalization Overall Capitalization Rate 3.9% - 7.2% (5.0%) Industrial Income Approach—Discounted Cash Flow Discount Rate 5.2% - 9.3% (6.7%) Income Approach—Direct Capitalization Overall Capitalization Rate 3.5% - 7.6% (4.8%) Apartment Income Approach—Discounted Cash Flow Discount Rate 5.3% - 7.8% (6.4%) Income Approach—Direct Capitalization Overall Capitalization Rate 3.8% - 6.0% (4.6%) Retail Income Approach—Discounted Cash Flow Discount Rate 5.3% - 11.8% (6.7%) Income Approach—Direct Capitalization Overall Capitalization Rate 4.3% - 11.5% (5.1%) Hotel Income Approach—Discounted Cash Flow Discount Rate 10.3% (10.3%) 7.8% (7.8%) Income Approach—Direct Capitalization Overall Capitalization Rate 7.5% (7.5%) Loans Payable Office and Industrial Discounted Cash Flow Loan to Value Ratio 31.9% - 59.2% (46.0%) Net Present Value Loan to Value Ratio 31.9% - 59.2% (46.0%) Apartment Discounted Cash Flow Loan to Value Ratio 31.2% - 69.0% (48.1%) Net Present Value Loan to Value Ratio 31.2% - 69.0% (48.1%) Retail Discounted Cash Flow Loan to Value Ratio 41.0% - 65.1% (46.2%) Net Present Value Loan to Value Ratio 41.0% - 65.1% (46.2%) Loans Receivable, including those with related parties Apartment, Hotel, Industrial, Office, Retail and Storage Discounted Cash Flow Loan to Value Ratio 31.7% - 88.5% (71.3%) The following table shows quantitative information about unobservable inputs related to the Level 3 fair value measurements as of June 30, 2019 (unaudited). Type Asset Class Valuation Unobservable Range (Weighted Average) Real Estate Properties and Joint Ventures Office Income Approach—Discounted Cash Flow Discount Rate 5.5% - 8.6% (6.6%) Income Approach—Direct Capitalization Overall Capitalization Rate 3.5% - 7.0% (4.9%) Industrial Income Approach—Discounted Cash Flow Discount Rate 5.3% - 9.3% (6.7%) Income Approach—Direct Capitalization Overall Capitalization Rate 3.9% - 7.8% (4.9%) Apartment Income Approach—Discounted Cash Flow Discount Rate 5.5% - 7.8% (6.4%) Income Approach—Direct Capitalization Overall Capitalization Rate 3.3% - 6.0% (4.5%) Retail Income Approach—Discounted Cash Flow Discount Rate 5.0% - 10.7% (6.5%) Income Approach—Direct Capitalization Overall Capitalization Rate 3.3% - 10.5% (4.8%) Loans Payable Office and Industrial Discounted Cash Flow Loan to Value Ratio 34.7% - 60.4% (47.3%) Net Present Value Loan to Value Ratio 34.7% - 60.4% (47.3%) Apartment Discounted Cash Flow Loan to Value Ratio 31.4% - 62.0% (48.1%) Net Present Value Loan to Value Ratio 31.4% - 62.0% (48.1%) Retail Discounted Cash Flow Loan to Value Ratio 32.0% - 63.3% (39.6%) Net Present Value Loan to Value Ratio 32.0% - 63.3% (39.6%) Loans Receivable Office, Retail and Storage Discounted Cash Flow Loan to Value Ratio 69.3% - 86.2% (77.6%)
Schedule of Fair Value of Net Unrealized Gains Included in Changes in Net Assets Attributable to Investments and Loans Payable Using Significant Unobservable Inputs	The amount of total net unrealized gains (losses) included in changes in net assets attributable to the change in net unrealized gains (losses) relating to Level 3 investments and loans payable using significant unobservable inputs still held as of the reporting date is as follows (millions, unaudited): Real Estate Properties Real Estate Joint Ventures Loans Receivable (1) Total Level 3 Investments Loans Payable For the three months ended June 30, 2020 $ (380.6 ) $ (255.6 ) $ (11.1 ) $ (647.3 ) $ (9.4 ) For the six months ended June 30, 2020 $ (232.9 ) $ (318.2 ) $ (22.2 ) $ (573.3 ) $ 36.3 For the three months ended June 30, 2019 $ 170.3 $ (14.7 ) $ (4.0 ) $ 151.6 $ (36.7 ) For the six months ended June 30, 2019 $ 244.2 $ (12.2 ) $ (2.8 ) $ 229.2 $ (66.3 ) (1) Amount shown is reflective of loans receivable and loans receivable with related parties.

Investments in Joint Ventures (

Investments in Joint Ventures (Tables)	6 Months Ended
	Jun. 30, 2020
Equity Method Investments and Joint Ventures [Abstract]
Summary of Results of Operations of the Joint Venture	A condensed summary of the results of operations of the joint ventures are shown below (millions, unaudited): For the Three Months Ended June 30, For the Six Months Ended June 30, 2020 2019 2020 2019 Operating Revenue and Expenses Revenues $ 250.8 $ 271.8 $ 536.3 $ 537.9 Expenses 145.3 149.4 299.9 294.7 Excess of revenues over expenses $ 105.5 $ 122.4 $ 236.4 $ 243.2

Investments in Real Estate Fu_2

Investments in Real Estate Funds (Tables)	6 Months Ended
	Jun. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Carrying Amount and Maximum Exposure to Loss Relating to VIEs	The carrying amount and maximum exposure to loss relating to unconsolidated VIEs in which the Company holds a significant variable interest but is not the primary beneficiary were as follows at June 30, 2020 (in millions, unaudited): Fund Name Carrying Amount Maximum Exposure to Loss Liquidity Provisions Investment Strategy LCS SHIP Venture I, LLC (90.0% Account Interest) $ 193.8 $ 193.8 Redemptions prohibited prior to liquidation. To invest in senior housing properties. Liquidation estimated to begin no earlier than 2025. The Account is permitted to sell or transfer its interest in the fund, subject to consent and approval of the manager. SP V - II, LLC (61.8% Account Interest) $ 27.0 $ 27.0 Redemptions prohibited prior to liquidation. To invest in medical office properties in the U.S. Liquidation estimated to begin no earlier than 2022. The Account is permitted to sell or transfer its interest in the fund, subject to consent and approval of the manager. Taconic New York City GP Fund, LP (60.0% Account Interest) $ 31.9 $ 31.9 Redemptions prohibited prior to liquidation. To invest in real estate and real estate-related assets in the New York City metropolitan statistical area ("MSA"). Liquidation estimated to begin no earlier than 2024. The Account is permitted to sell its interest in the fund, subject to consent and approval of the general partner. Veritas - Trophy VI, LLC (90.4% Account Interest) $ 43.5 $ 43.5 Redemptions prohibited prior to liquidation. To invest in multi-family properties primarily in the San Francisco Bay and Los Angeles MSA. The Account is not permitted to sell or transfer its interest in the fund until August 2022. After this date, the Account can sell or transfer its interest in the fund with the consent and approval of the manager. IDR - Core Property Index Fund, LLC (1.6% Account Interest) $ 25.2 $ 25.2 Redemptions are permitted for a full calendar quarter and upon at least 90 days prior written notice, subject to fund availability. To invest primarily in open-ended funds that fall within the NFI-ODCE Index and are actively managed. The Account is permitted to sell its interest in the fund, subject to consent and approval of the manager. Grubb Southeast Real Estate Fund VI, LLC (66.7% Account Interest) $ 15.6 $ 15.6 Redemptions prohibited prior to liquidation. To acquire office investments across the Southeast. Liquidation estimated to begin no earlier than 2026. The Account is not permitted to sell or transfer its interest in the fund until June 2021. After this date, the Account can sell or transfer its interest in the fund with the consent and approval of the manager. JCR Capital - REA Preferred Equity Parallel Fund (49.2% Account Interest) $ 3.7 $ 3.7 Redemptions prohibited prior to liquidation. To invest primarily in multi-family properties. Liquidation estimated to begin no earlier than 2026. The Account is prohibited from transferring its interest in the fund without consent by the general partner, which can be withheld in their sole discretion Total $ 340.7 $ 340.7

Loans Receivable (Tables)

Loans Receivable (Tables)	6 Months Ended
	Jun. 30, 2020
Receivables [Abstract]
Schedule of Loans Receivable, Underlying Real Estate Collateral by Property Types	The following property types represent the underlying real estate collateral for the Account's mezzanine loans (millions): June 30, 2020 December 31, 2019 (Unaudited) Principal Outstanding Fair Value % of Fair Value Principal Outstanding Fair Value % of Fair Value Office (1) $ 787.5 $ 781.7 49.5 % $ 769.3 $ 768.0 48.8 % Industrial 195.7 195.7 12.4 % 199.6 199.6 12.7 % Retail 139.4 136.9 8.7 % 158.5 158.5 10.1 % Storage 82.0 73.8 4.7 % 82.0 82.0 5.2 % Apartments (1) 262.2 260.2 16.5 % 229.1 228.8 14.6 % Hotel 135.3 129.9 8.2 % 135.3 135.2 8.6 % $ 1,602.1 $ 1,578.2 100.0 % $ 1,573.8 $ 1,572.1 100.0 % (1) Includes loans receivable with related parties.
Schedule of Fair Value Based on Risk Ratings	The following table presents the fair values of the Account's loan portfolio based on the risk ratings as of June 30, 2020 (in millions, unaudited), listed in order of the strength of the risk rating (from strongest to weakest): June 30, 2020 December 31, 2019 (Unaudited) Number of Loans Fair Value % of Fair Value Number of Loans Fair Value % of Fair Value A 1 $ 76.8 4.9 % 1 $ 48.3 3.1 % BBB 2 65.7 4.2 % 7 456.1 29.0 % BB 15 930.3 58.8 % 13 787.4 50.1 % B 6 362.6 23.0 % 3 205.0 13.0 % D 1 73.8 4.7 % — — — % NR (1) 2 69.0 4.4 % 3 75.3 4.8 % 27 $ 1,578.2 100.0 % 27 $ 1,572.1 100.0 % (1) "NR" designates loans not assigned an internal credit rating. As of June 30, 2020 and December 31, 2019, this is comprised of two loans with related parties. The loans are collateralized by equity interests in real estate investments.
Schedule of Loans Receivable in Nonaccrual Status	The following table represents loans receivable in nonaccrual status as of June 30, 2020 (in millions, unaudited). Loans are placed in nonaccrual status when a loan is more than 90 days in arrears or at any point when management believes the full collection of principal is doubtful. Aging Number of Loans Principal Outstanding Fair Value Past Due - 90 Days + 1 $ 82.0 $ 73.8

Loans Payable (Tables)

Loans Payable (Tables)	6 Months Ended
	Jun. 30, 2020
Debt Disclosure [Abstract]
Schedule of Outstanding Loans Payable	At June 30, 2020 , the Account had outstanding loans payable secured by the following assets (millions): Property Annual Interest Rate and (2) Principal Maturity June 30, 2020 December 31, 2019 (Unaudited) Red Canyon at Palomino Park 5.34% paid monthly $ — $ 27.1 August 1, 2020 Green River at Palomino Park 5.34% paid monthly — 33.2 August 1, 2020 Blue Ridge at Palomino Park 5.34% paid monthly — 33.4 August 1, 2020 Ashford Meadows Apartments 5.17% paid monthly — 44.6 August 1, 2020 The Knoll 3.98% paid monthly — 16.4 December 5, 2020 Ascent at Windward 3.51% paid monthly 34.6 34.6 January 1, 2022 The Palatine (1) 4.25% paid monthly 75.1 75.9 January 10, 2022 The Forum at Carlsbad (1) 4.25% paid monthly 84.8 85.7 March 1, 2022 Fusion 1560 3.42% paid monthly 37.4 37.4 June 10, 2022 San Diego Office Portfolio (4) 3.62% paid monthly 49.7 48.2 August 15, 2022 The Colorado (1) 3.69% paid monthly 87.3 88.1 November 1, 2022 The Legacy at Westwood (1) 3.69% paid monthly 44.5 44.9 November 1, 2022 Regents Court (1) 3.69% paid monthly 37.7 38.1 November 1, 2022 1001 Pennsylvania Avenue (1) 3.70% paid monthly 317.5 320.7 June 1, 2023 Biltmore at Midtown 3.94% paid monthly 36.4 36.4 July 5, 2023 Cherry Knoll 3.78% paid monthly 35.3 35.3 July 5, 2023 Lofts at SoDo 3.94% paid monthly 35.1 35.1 July 5, 2023 Pacific City 2.00% + LIBOR paid monthly 105.0 — October 1, 2023 Birkdale Village (1) 4.30% paid monthly 77.9 — April 1, 2024 1401 H Street, NW 3.65% paid monthly 115.0 115.0 November 5, 2024 The District at La Frontera (1) 3.84% paid monthly 39.0 39.3 December 1, 2024 The District at La Frontera (1) 4.96% paid monthly 4.3 4.4 December 1, 2024 Circa Green Lake 3.71% paid monthly 52.0 52.0 March 5, 2025 Union - South Lake Union 3.66% paid monthly 57.0 57.0 March 5, 2025 Holly Street Village 3.65% paid monthly 81.0 81.0 May 1, 2025 Henley at Kingstowne 3.60% paid monthly 71.0 71.0 May 1, 2025 32 South State Street 4.48% paid monthly 24.0 24.0 June 6, 2025 Vista Station Office Portfolio (1) 4.00% paid monthly 20.2 20.5 July 1, 2025 780 Third Avenue 3.55% paid monthly 150.0 150.0 August 1, 2025 780 Third Avenue 3.55% paid monthly 20.0 20.0 August 1, 2025 Vista Station Office Portfolio (1) 4.20% paid monthly 44.3 44.7 November 1, 2025 701 Brickell Avenue 3.66% paid monthly 184.0 184.0 April 1, 2026 Marketplace at Mill Creek 3.82% paid monthly 39.6 — September 11, 2027 Overlook At King Of Prussia 3.82% paid monthly 40.8 — September 11, 2027 Winslow Bay 3.82% paid monthly 25.8 — September 11, 2027 1900 K Street, NW 3.93% paid monthly 163.0 163.0 April 1, 2028 99 High Street 3.90% paid monthly 277.0 277.0 March 1, 2030 Total Principal Outstanding $ 2,466.3 $ 2,338.0 Fair Value Adjustment (3) (9.3 ) 27.0 Total Loans Payable $ 2,457.0 $ 2,365.0 (1) The mortgage is adjusted monthly for principal payments. (2) All interest rates are fixed except for Pacific City, which has a variable interest rate based on a spread above the one month London Interbank Offered Rate, as published by ICE Benchmark Administration Limited. Some mortgages held by the Account are structured to begin principal and interest payments after an initial interest only period. (3) The fair value adjustment consists of the difference (positive or negative) between the principal amount of the outstanding debt and the fair value of the outstanding debt. See Note 1—Organization and Significant Accounting Policies. (4) The loan is collateralized by a mezzanine loan receivable. The mezzanine loan receivable is collateralized by the property reflected within the table above.

Financial Highlights (Tables)

Financial Highlights (Tables)	6 Months Ended
	Jun. 30, 2020
Condensed Financial Information Disclosure [Abstract]
Schedule Of Condensed Financial Information For An Accumulation Unit of The Account	Selected condensed financial information for an Accumulation Unit of the Account is presented below. Per Accumulation Unit data is calculated on average units outstanding. For the Six Months Ended June 30, 2020 Years Ended December 31, 2019 2018 2017 (Unaudited) Per Accumulation Unit Data: Rental income $ 10.598 $ 18.165 $ 17.757 $ 17.132 Real estate property level expenses and taxes 4.926 8.734 8.548 7.722 Real estate income, net 5.672 9.431 9.209 9.410 Other income 2.650 6.752 6.162 4.762 Total income 8.322 16.183 15.371 14.172 Expense charges (1) 1.691 3.439 3.161 3.318 Investment income, net 6.631 12.744 12.210 10.854 Net realized and unrealized gain on investments and loans payable (12.609 ) 10.262 6.877 5.839 Net increase in Accumulation Unit Value (5.978 ) 23.006 19.087 16.693 Accumulation Unit Value: Beginning of period 440.422 417.416 398.329 381.636 End of period $ 434.444 $ 440.422 $ 417.416 $ 398.329 Total return (3) (1.36 )% 5.51 % 4.79 % 4.37 % Ratios to Average net assets (2) : Expenses (1) 0.75 % 0.78 % 0.76 % 0.83 % Investment income, net 2.95 % 2.90 % 2.95 % 2.72 % Portfolio turnover rate (3) : Real estate properties (4) 5.6 % 7.8 % 11.8 % 2.7 % Marketable securities (5) 76.8 % 28.7 % 5.1 % 5.7 % Accumulation Units outstanding at end of period (millions) 54.5 60.8 60.7 61.3 Net assets end of period (millions) $ 24,212.8 $ 27,307.9 $ 25,842.6 $ 24,942.6 (1) Expense charges per Accumulation Unit and the Ratio of Expenses to average net assets reflect the year to date Account level expenses and exclude real estate property level expenses which are included in real estate income, net. (2) Percentages for the six months ended June 30, 2020 are annualized. (3) Percentages for the six months ended June 30, 2020 are not annualized. (4) Real estate investment portfolio turnover rate is calculated by dividing the lesser of purchases or sales of real estate property investments (including contributions to, or return of capital distributions received from, existing real estate joint ventures and fund investments) by the average value of the portfolio of real estate investments held during the period. (5) Marketable securities portfolio turnover rate is calculated by dividing the lesser of purchases or sales of securities, excluding securities having maturity dates at acquisition of one year or less, by the average value of the portfolio securities held during the period.

Accumulation Units (Tables)

Accumulation Units (Tables)	6 Months Ended
	Jun. 30, 2020
Accumulated Units Disclosure [Abstract]
Schedule Of Changes In The Number Of Accumulation Units Outstanding	Changes in the number of Accumulation Units outstanding were as follows (in millions): For the Six Months Ended June 30, 2020 For the Year Ended December 31, 2019 (Unaudited) Outstanding: Beginning of period 60.8 60.7 Credited for premiums 2.6 6.2 Annuity, other periodic payments, withdrawals and death benefits (8.9 ) (6.1 ) End of period 54.5 60.8

Commitments and Contingencies (

Commitments and Contingencies (Tables)	6 Months Ended
	Jun. 30, 2020
Commitments and Contingencies Disclosure [Abstract]
Schedule of Callable Commitments	As of June 30, 2020 and December 31, 2019, the Account had the following immediately callable commitments to purchase additional interests in its real estate funds or provide additional funding through its loans receivable investments: Commitment Expiration June 30, 2020 December 31, 2019 (Unaudited) Real Estate Funds (1) Taconic New York City GP Fund 11/2020 $ 6.0 $ 11.4 LCS SHIP Venture I, LLC 12/2020 28.1 28.1 Veritas Trophy VI, LLC (2) 08/2022 41.8 35.8 SP V - II, LLC 09/2022 73.8 74.9 Grubb Southeast Real Estate Fund VI, LLC 06/2021 83.6 86.6 JCR Capital - REA Preferred Equity Parallel Fund 12/2022 95.8 100.0 Townsend Strategic Ventures LP 03/2021 250.0 250.0 Silverpeak NRE Fund Co, LLC 01/2028 100.0 — TREA Flagler Venture, LLC 02/2025 100.0 — 779.1 586.8 Loans Receivable (3) 311 South Wacker Mezzanine 06/2021 $ 5.7 $ 7.6 Rosemont Towson Mezzanine 09/2021 1.2 1.2 1330 Broadway Mezzanine 09/2022 14.0 14.0 SCG Oakland Portfolio Mezzanine 03/2021 6.9 7.0 BREP VIII Industrial Mezzanine 03/2021 14.1 14.1 San Diego Office Portfolio Senior Loan 08/2022 8.5 10.0 San Diego Office Portfolio Mezzanine 08/2022 2.8 3.3 MRA Hub 34 Holding, LLC 09/2022 1.5 1.5 Liberty Park Mezzanine 11/2021 4.2 5.0 Colony New England Hotel Portfolio Senior Loan 11/2022 14.1 14.1 Colony New England Hotel Portfolio Mezzanine 11/2022 4.7 4.7 Exo Apartments Senior Loan 01/2023 7.1 7.1 Exo Apartments Mezzanine 01/2023 2.4 2.4 Five Oak Mezzanine 03/2023 2.4 — 89.6 92.0 TOTAL COMMITMENTS $ 868.7 $ 678.8 (1) Additional capital can be called during the commitment period at any time. The commitment period can only be extended by the manager with the consent of the Account. The commitment expiration date is reflective of the most recent signed agreement between the Account and the fund manager, including any side letter agreements. (2) The fund manager is granted 18 months from the initial contribution date, August 2019, to make its first capital call. If none have occurred, the Account's commitment will be reduced by $15.0 million . If a capital call occurs during the initial 18 month window, the commitment period will be modified to three years from the first capital call date. (3) Additional advances from the Account can be requested during the commitment period at any time. The commitment expiration date is reflective of the most recent signed agreement between the Account and the borrower, including any side letter agreements. Certain loans contain extension clauses on the term of the loan that do not require the Account's prior consent. If elected, the Account's commitment may be extended through the extension term.

Organization and Significant _3

Organization and Significant Accounting Policies - Narrative (Details)	6 Months Ended
	Jun. 30, 2020
Principal Transaction Revenue [Line Items]
Independent appraisal firm, property rotation, period (at least)	3 years
Description of valuation change of real estate related assets	Also, the Independent Fiduciary may require additional appraisals if factors or events have occurred that could materially change a property’s value (including those identified previously) and such change is not reflected in the quarterly valuation review, or otherwise to ensure that the Account is valued appropriately. The Independent Fiduciary must also approve any valuation change of real estate-related assets where a property’s value changed by more than 6% from the most recent independent annual appraisal, or if the value of the Account would change by more than 4% within any calendar quarter or more than 2% since the prior calendar month. When a real estate property is subject to a mortgage, the property is valued independently of the mortgage and the property and mortgage fair values are reported separately (see Valuation of Loans Payable). The Independent Fiduciary reviews and approves all mortgage valuation adjustments before such adjustments are recorded by the Account. The Account continues to use the revised value for each real estate property and mortgage loan payable to calculate the Account’s daily net asset value until the next valuation review or appraisal.
Threshold percentage, property value change compared to most recent independent annual appraisal (more than)	6.00%
Threshold percentage, property value change within any calendar quarter (more than)	4.00%
Threshold percentage, property value change compared to prior calendar month (more than)	2.00%
Maximum percentage of average net assets for all account level expenses (not to exceed)	2.50%
Minimum
Principal Transaction Revenue [Line Items]
Investment advisory fees, paid or received, period	1 day
Maximum
Principal Transaction Revenue [Line Items]
Investment advisory fees, paid or received, period	2 days

Related Party Transactions - Na

Related Party Transactions - Narrative (Details)	6 Months Ended
	Jun. 30, 2020
Related Party Transactions [Abstract]
Distribution Agreement, termination period	60 days

Related Party Transactions - Sc

Related Party Transactions - Schedule of Key Terms of the Loans (Details) - Loans Receivable - Related Party - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Related Party Transaction [Line Items]
TOTAL LOANS RECEIVABLE WITH RELATED PARTIES	$ 69	$ 69
MRA Hub 34 Holding, LLC
Related Party Transaction [Line Items]
Principal	$ 36.5	36.5
Equity Ownership Interest	95.00%
TOTAL LOANS RECEIVABLE WITH RELATED PARTIES	$ 36.5	36.5
MRA Hub 34 Holding, LLC | LIBOR
Related Party Transaction [Line Items]
Interest Rate, Variable	2.50%
THP Student Housing, LLC
Related Party Transaction [Line Items]
Principal	$ 32.8	32.8
Equity Ownership Interest	97.00%
Interest Rate	3.20%
TOTAL LOANS RECEIVABLE WITH RELATED PARTIES	$ 32.5	$ 32.5

Concentrations of Risk - Narrat

Concentrations of Risk - Narrative (Details)	6 Months Ended
	Jun. 30, 2020lease_expiration
Risks and Uncertainties [Abstract]
Maximum percentage of annual contract rent of rental income	4.00%
Lease expirations scheduled to occur over next twelve months	0

Concentrations of Risk - Schedu

Concentrations of Risk - Schedule of diversification of the Account's portfolio by region and property type (Details)	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Concentration Risk [Line Items]
Concentration risk percentage	100.00%	100.00%
Office
Concentration Risk [Line Items]
Concentration risk percentage	37.90%
Apartment
Concentration Risk [Line Items]
Concentration risk percentage	25.40%
Retail
Concentration Risk [Line Items]
Concentration risk percentage	19.00%
Industrial
Concentration Risk [Line Items]
Concentration risk percentage	16.10%
Other
Concentration Risk [Line Items]
Concentration risk percentage	1.60%
West
Concentration Risk [Line Items]
Concentration risk percentage	39.80%
West | Office
Concentration Risk [Line Items]
Concentration risk percentage	13.40%
West | Apartment
Concentration Risk [Line Items]
Concentration risk percentage	9.90%
West | Retail
Concentration Risk [Line Items]
Concentration risk percentage	6.70%
West | Industrial
Concentration Risk [Line Items]
Concentration risk percentage	9.30%
West | Other
Concentration Risk [Line Items]
Concentration risk percentage	0.50%
East
Concentration Risk [Line Items]
Concentration risk percentage	31.40%
East | Office
Concentration Risk [Line Items]
Concentration risk percentage	19.10%
East | Apartment
Concentration Risk [Line Items]
Concentration risk percentage	6.50%
East | Retail
Concentration Risk [Line Items]
Concentration risk percentage	3.80%
East | Industrial
Concentration Risk [Line Items]
Concentration risk percentage	1.60%
East | Other
Concentration Risk [Line Items]
Concentration risk percentage	0.40%
South
Concentration Risk [Line Items]
Concentration risk percentage	26.40%
South | Office
Concentration Risk [Line Items]
Concentration risk percentage	5.40%
South | Apartment
Concentration Risk [Line Items]
Concentration risk percentage	8.00%
South | Retail
Concentration Risk [Line Items]
Concentration risk percentage	7.60%
South | Industrial
Concentration Risk [Line Items]
Concentration risk percentage	4.70%
South | Other
Concentration Risk [Line Items]
Concentration risk percentage	0.70%
Midwest
Concentration Risk [Line Items]
Concentration risk percentage	2.40%
Midwest | Office
Concentration Risk [Line Items]
Concentration risk percentage	0.00%
Midwest | Apartment
Concentration Risk [Line Items]
Concentration risk percentage	1.00%
Midwest | Retail
Concentration Risk [Line Items]
Concentration risk percentage	0.90%
Midwest | Industrial
Concentration Risk [Line Items]
Concentration risk percentage	0.50%
Midwest | Other
Concentration Risk [Line Items]
Concentration risk percentage	0.00%

Leases - Schedule of aggregate

Leases - Schedule of aggregate minimum annual rental payments (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Current Year [Abstract]
2020	$ 327.2
2021	608.3	$ 550.4
2022	527.8	505
2023	451.7	442.1
2024	374.5	381.2
Thereafter	1,246
Total	3,535.5	3,273.7
Prior Year [Abstract]
2020	608.3	550.4
2021	527.8	505
2022	451.7	442.1
2023	374.5	381.2
2024		316.6
Thereafter		1,078.4
Total	$ 3,535.5	$ 3,273.7

Leases - Schedule of right-of-u

Leases - Schedule of right-of-use assets and lease liabilities related to ground leases (Details) - Ground - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Assets:
Right-of-use assets, at fair value	$ 35.1	$ 25.7
Liabilities:
Ground lease liabilities, at fair value	$ 35.1	$ 25.7
Key Terms:
Weighted-average remaining lease term (years)	67 years 10 months 24 days	84 years 4 months 24 days
Weighted-average discount rate	7.81%	6.15%

Leases - Narrative (Details)

Leases - Narrative (Details) $ in Millions	6 Months Ended
	Jun. 30, 2020USD ($)
Ground
Lessee, Lease, Description [Line Items]
Operating lease cost, related to ground leases	$ 1

Leases - Schedule of future min

Leases - Schedule of future minimum annual payments for ground leases (Details) - Ground - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Current Year [Abstract]
2020	$ 1.1
2021	2.3	$ 1.2
2022	2.3	1.2
2023	2.3	1.2
2024	2.3	1.2
Thereafter	416
Total	426.3	382
Prior Year [Abstract]
2020	2.3	1.2
2021	2.3	1.2
2022	2.3	1.2
2023	2.3	1.2
2024		1.3
Thereafter		375.9
Total	$ 426.3	$ 382

Assets and Liabilities Measur_3

Assets and Liabilities Measured at Fair Value on a Recurring Basis - Schedule of fair value assets and liabilities measured on recurring basis (Details) - USD ($) $ in Millions		Jun. 30, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real estate properties		$ 16,748.6	$ 15,835
Marketable securities:
Real estate-related	[1]	838.4	825.7
Marketable securities excluding Real estate-related		1,389.7	4,150.2
Total investments (cost: $23,041.5 and $25,697.4)		26,920.2	29,899
Loans payable		(2,457)	(2,365)
Line of credit		(291)	(250)
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real estate properties		16,748.6	15,835
Real estate joint ventures		6,024.6	7,204.2
Real estate funds		340.7	311.8
Marketable securities:
Real estate-related		838.4	825.7
Loans receivable		1,578.2	1,572.1
Total investments (cost: $23,041.5 and $25,697.4)		26,920.2	29,899
Loans payable		(2,457)	(2,365)
Line of credit		(291)	(250)
Fair Value, Measurements, Recurring | Government agency notes
Marketable securities:
Marketable securities excluding Real estate-related		15	259.6
Fair Value, Measurements, Recurring | United States Treasury securities
Marketable securities:
Marketable securities excluding Real estate-related		1,374.7	2,589.1
Fair Value, Measurements, Recurring | Corporate bonds
Marketable securities:
Marketable securities excluding Real estate-related			1,268.3
Fair Value, Measurements, Recurring | Municipal bonds
Marketable securities:
Marketable securities excluding Real estate-related			33.2
Fair Value, Measurements, Recurring | Level 1: Quoted Prices in Active Markets for Identical Assets
Marketable securities:
Real estate-related		838.4	825.7
Total investments (cost: $23,041.5 and $25,697.4)		838.4	825.7
Fair Value, Measurements, Recurring | Level 2: Significant Other Observable Inputs
Marketable securities:
Total investments (cost: $23,041.5 and $25,697.4)		1,389.7	4,150.2
Fair Value, Measurements, Recurring | Level 2: Significant Other Observable Inputs | Government agency notes
Marketable securities:
Marketable securities excluding Real estate-related		15	259.6
Fair Value, Measurements, Recurring | Level 2: Significant Other Observable Inputs | United States Treasury securities
Marketable securities:
Marketable securities excluding Real estate-related		1,374.7	2,589.1
Fair Value, Measurements, Recurring | Level 2: Significant Other Observable Inputs | Corporate bonds
Marketable securities:
Marketable securities excluding Real estate-related			1,268.3
Fair Value, Measurements, Recurring | Level 2: Significant Other Observable Inputs | Municipal bonds
Marketable securities:
Marketable securities excluding Real estate-related			33.2
Fair Value, Measurements, Recurring | Level 3: Significant Unobservable Inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real estate properties		16,748.6	15,835
Real estate joint ventures		6,024.6	7,204.2
Marketable securities:
Loans receivable		1,578.2	1,572.1
Total investments (cost: $23,041.5 and $25,697.4)		24,351.4	24,611.3
Loans payable		(2,457)	(2,365)
Line of credit		$ (291)	$ (250)
[1]	Includes securities loaned of $8.5 million at June 30, 2020 and $25.2 million at December 31, 2019 .

Assets and Liabilities Measur_4

Assets and Liabilities Measured at Fair Value on a Recurring Basis - Schedule of fair value assets and liabilities measured on recurring basis using unobservable inputs (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total realized and unrealized losses included in changes in net assets	$ (647.3)	$ 151.6	$ (573.3)	$ 229.2
Loans Payable
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	(2,605.6)	(2,632.9)	(2,365)	(2,608)
Total realized and unrealized gains included in changes in net assets	(9.4)	(36.7)	36.3	(66.3)
Purchases	0	(110)	(289.6)	(110)
Settlements	158	4.9	161.3	9.6
Ending balance	(2,457)	(2,774.7)	(2,457)	(2,774.7)
Line of Credit
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	(190)		(250)
Purchases	(140)		(540)
Settlements	39		499
Ending balance	(291)		(291)
Real Estate Properties
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	17,082.1	15,968.6	15,835	15,531.1
Total realized and unrealized losses included in changes in net assets	(379.4)	170.3	(241.9)	244.2
Purchases	51.7	333	1,508.9	699.7
Sales	(5.8)	0	(353.4)	(3.1)
Ending balance	16,748.6	16,471.9	16,748.6	16,471.9
Real Estate Joint Ventures
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	6,237.4	6,420.4	7,204.2	6,356.6
Total realized and unrealized losses included in changes in net assets	(220.1)	(20.7)	(376.5)	(13.6)
Purchases	21.4	326.8	42	383.9
Settlements	(14.1)	(6.2)	(845.1)	(6.6)
Ending balance	6,024.6	6,720.3	6,024.6	6,720.3
Loans Receivable
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	1,631	967.3	1,572.1	913
Total realized and unrealized losses included in changes in net assets	(11.1)	(4)	(23.8)	(2.8)
Purchases	2.3	144.6	111.3	219
Sales	(40)		(64.7)
Settlements	(4)	(2.8)	(16.7)	(24.1)
Ending balance	1,578.2	1,105.1	1,578.2	1,105.1
Total Level 3 Investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	24,950.5	23,356.3	24,611.3	22,800.7
Total realized and unrealized losses included in changes in net assets	(610.6)	145.6	(642.2)	227.8
Purchases	75.4	804.4	1,662.2	1,302.6
Sales	(45.8)	0	(418.1)	(3.1)
Settlements	(18.1)	(9)	(861.8)	(30.7)
Ending balance	$ 24,351.4	$ 24,297.3	$ 24,351.4	$ 24,297.3

Assets and Liabilities Measur_5

Assets and Liabilities Measured at Fair Value on a Recurring Basis - Schedule of unobservable inputs related to Level 3 fair value measurements (Details) - Level 3: Significant Unobservable Inputs	Jun. 30, 2020	Jun. 30, 2019
Discount Rate | Real Estate Properties and Joint Ventures | Office | Minimum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.055	0.055
Discount Rate | Real Estate Properties and Joint Ventures | Office | Maximum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.085	0.086
Discount Rate | Real Estate Properties and Joint Ventures | Office | Weighted Average | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.066	0.066
Discount Rate | Real Estate Properties and Joint Ventures | Industrial | Minimum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.052	0.053
Discount Rate | Real Estate Properties and Joint Ventures | Industrial | Maximum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.093	0.093
Discount Rate | Real Estate Properties and Joint Ventures | Industrial | Weighted Average | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.067	0.067
Discount Rate | Real Estate Properties and Joint Ventures | Apartment | Minimum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.053	0.055
Discount Rate | Real Estate Properties and Joint Ventures | Apartment | Maximum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.078	0.078
Discount Rate | Real Estate Properties and Joint Ventures | Apartment | Weighted Average | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.064	0.064
Discount Rate | Real Estate Properties and Joint Ventures | Retail | Minimum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.053	0.050
Discount Rate | Real Estate Properties and Joint Ventures | Retail | Maximum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.118	0.107
Discount Rate | Real Estate Properties and Joint Ventures | Retail | Weighted Average | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.067	0.065
Discount Rate | Real Estate Properties and Joint Ventures | Hotel | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.103
Discount Rate | Real Estate Properties and Joint Ventures | Hotel | Weighted Average | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.103
Capitalization Rate | Real Estate Properties and Joint Ventures | Office | Minimum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.040	0.040
Capitalization Rate | Real Estate Properties and Joint Ventures | Office | Minimum | Direct Capitalization
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.039	0.035
Capitalization Rate | Real Estate Properties and Joint Ventures | Office | Maximum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.075	0.075
Capitalization Rate | Real Estate Properties and Joint Ventures | Office | Maximum | Direct Capitalization
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.072	0.070
Capitalization Rate | Real Estate Properties and Joint Ventures | Office | Weighted Average | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.055	0.055
Capitalization Rate | Real Estate Properties and Joint Ventures | Office | Weighted Average | Direct Capitalization
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.050	0.049
Capitalization Rate | Real Estate Properties and Joint Ventures | Industrial | Minimum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.043	0.043
Capitalization Rate | Real Estate Properties and Joint Ventures | Industrial | Minimum | Direct Capitalization
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.035	0.039
Capitalization Rate | Real Estate Properties and Joint Ventures | Industrial | Maximum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.083	0.083
Capitalization Rate | Real Estate Properties and Joint Ventures | Industrial | Maximum | Direct Capitalization
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.076	0.078
Capitalization Rate | Real Estate Properties and Joint Ventures | Industrial | Weighted Average | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.055	0.055
Capitalization Rate | Real Estate Properties and Joint Ventures | Industrial | Weighted Average | Direct Capitalization
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.048	0.049
Capitalization Rate | Real Estate Properties and Joint Ventures | Apartment | Minimum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.043	0.038
Capitalization Rate | Real Estate Properties and Joint Ventures | Apartment | Minimum | Direct Capitalization
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.038	0.033
Capitalization Rate | Real Estate Properties and Joint Ventures | Apartment | Maximum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.068	0.068
Capitalization Rate | Real Estate Properties and Joint Ventures | Apartment | Maximum | Direct Capitalization
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.060	0.060
Capitalization Rate | Real Estate Properties and Joint Ventures | Apartment | Weighted Average | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.051	0.050
Capitalization Rate | Real Estate Properties and Joint Ventures | Apartment | Weighted Average | Direct Capitalization
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.046	0.045
Capitalization Rate | Real Estate Properties and Joint Ventures | Retail | Minimum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.050	0.043
Capitalization Rate | Real Estate Properties and Joint Ventures | Retail | Minimum | Direct Capitalization
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.043	0.033
Capitalization Rate | Real Estate Properties and Joint Ventures | Retail | Maximum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.094	0.092
Capitalization Rate | Real Estate Properties and Joint Ventures | Retail | Maximum | Direct Capitalization
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.115	0.105
Capitalization Rate | Real Estate Properties and Joint Ventures | Retail | Weighted Average | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.056	0.054
Capitalization Rate | Real Estate Properties and Joint Ventures | Retail | Weighted Average | Direct Capitalization
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.051	0.048
Capitalization Rate | Real Estate Properties and Joint Ventures | Hotel | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.078
Capitalization Rate | Real Estate Properties and Joint Ventures | Hotel | Direct Capitalization
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.075
Capitalization Rate | Real Estate Properties and Joint Ventures | Hotel | Weighted Average | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.078
Capitalization Rate | Real Estate Properties and Joint Ventures | Hotel | Weighted Average | Direct Capitalization
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Real Estate Properties and Joint Ventures	0.075
Loan to Value Ratio | Loans Payable | Apartment | Minimum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.312	0.314
Loan to Value Ratio | Loans Payable | Apartment | Minimum | Net Present Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.312	0.314
Loan to Value Ratio | Loans Payable | Apartment | Maximum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.690	0.620
Loan to Value Ratio | Loans Payable | Apartment | Maximum | Net Present Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.690	0.620
Loan to Value Ratio | Loans Payable | Apartment | Weighted Average | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.481	0.481
Loan to Value Ratio | Loans Payable | Apartment | Weighted Average | Net Present Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.481	0.481
Loan to Value Ratio | Loans Payable | Retail | Minimum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.410	0.320
Loan to Value Ratio | Loans Payable | Retail | Minimum | Net Present Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.410	0.320
Loan to Value Ratio | Loans Payable | Retail | Maximum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.651	0.633
Loan to Value Ratio | Loans Payable | Retail | Maximum | Net Present Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.651	0.633
Loan to Value Ratio | Loans Payable | Retail | Weighted Average | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.462	0.396
Loan to Value Ratio | Loans Payable | Retail | Weighted Average | Net Present Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.462	0.396
Loan to Value Ratio | Loans Payable | Office and Industrial | Minimum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.319	0.347
Loan to Value Ratio | Loans Payable | Office and Industrial | Minimum | Net Present Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.319	0.347
Loan to Value Ratio | Loans Payable | Office and Industrial | Maximum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.592	0.604
Loan to Value Ratio | Loans Payable | Office and Industrial | Maximum | Net Present Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.592	0.604
Loan to Value Ratio | Loans Payable | Office and Industrial | Weighted Average | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.460	0.473
Loan to Value Ratio | Loans Payable | Office and Industrial | Weighted Average | Net Present Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.460	0.473
Loan to Value Ratio | Loans Receivable, including those with related parties | Apartment, Hotel, Industrial, Office, Retail and Storage | Minimum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Receivable	0.317
Loan to Value Ratio | Loans Receivable, including those with related parties | Apartment, Hotel, Industrial, Office, Retail and Storage | Maximum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Receivable	0.885
Loan to Value Ratio | Loans Receivable, including those with related parties | Apartment, Hotel, Industrial, Office, Retail and Storage | Weighted Average | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Receivable	0.713
Loan to Value Ratio | Loans Receivable | Office, Retail and Storage | Minimum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Receivable		0.693
Loan to Value Ratio | Loans Receivable | Office, Retail and Storage | Maximum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Receivable		0.862
Loan to Value Ratio | Loans Receivable | Office, Retail and Storage | Weighted Average | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Receivable		0.776
Equivalency Rate | Loans Payable | Apartment | Minimum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.031	0.034
Equivalency Rate | Loans Payable | Apartment | Maximum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.041	0.040
Equivalency Rate | Loans Payable | Apartment | Weighted Average | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.036	0.037
Equivalency Rate | Loans Payable | Retail | Minimum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.031	0.036
Equivalency Rate | Loans Payable | Retail | Maximum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.043	0.047
Equivalency Rate | Loans Payable | Retail | Weighted Average | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.038	0.040
Equivalency Rate | Loans Payable | Office and Industrial | Minimum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.026	0.035
Equivalency Rate | Loans Payable | Office and Industrial | Maximum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.043	0.055
Equivalency Rate | Loans Payable | Office and Industrial | Weighted Average | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	0.037	0.040
Equivalency Rate | Loans Receivable, including those with related parties | Apartment, Hotel, Industrial, Office, Retail and Storage | Minimum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Receivable	0.034
Equivalency Rate | Loans Receivable, including those with related parties | Apartment, Hotel, Industrial, Office, Retail and Storage | Maximum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Receivable	0.122
Equivalency Rate | Loans Receivable, including those with related parties | Apartment, Hotel, Industrial, Office, Retail and Storage | Weighted Average | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Receivable	0.061
Equivalency Rate | Loans Receivable | Office, Retail and Storage | Minimum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Receivable		0.062
Equivalency Rate | Loans Receivable | Office, Retail and Storage | Maximum | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Receivable		0.087
Equivalency Rate | Loans Receivable | Office, Retail and Storage | Weighted Average | Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Receivable		0.072
Weighted Average Cost of Capital Risk Premium Multiple | Loans Payable | Apartment | Minimum | Net Present Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	1.20	1.20
Weighted Average Cost of Capital Risk Premium Multiple | Loans Payable | Apartment | Maximum | Net Present Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	1.60	1.40
Weighted Average Cost of Capital Risk Premium Multiple | Loans Payable | Apartment | Weighted Average | Net Present Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	1.30	1.30
Weighted Average Cost of Capital Risk Premium Multiple | Loans Payable | Retail | Minimum | Net Present Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	1.30	1.20
Weighted Average Cost of Capital Risk Premium Multiple | Loans Payable | Retail | Maximum | Net Present Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	1.60	1.50
Weighted Average Cost of Capital Risk Premium Multiple | Loans Payable | Retail | Weighted Average | Net Present Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	1.30	1.20
Weighted Average Cost of Capital Risk Premium Multiple | Loans Payable | Office and Industrial | Minimum | Net Present Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	1.20	1.20
Weighted Average Cost of Capital Risk Premium Multiple | Loans Payable | Office and Industrial | Maximum | Net Present Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	1.40	1.40
Weighted Average Cost of Capital Risk Premium Multiple | Loans Payable | Office and Industrial | Weighted Average | Net Present Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Payable	1.30	1.30

Assets and Liabilities Measur_6

Assets and Liabilities Measured at Fair Value on a Recurring Basis - Schedule of net unrealized gains included in changes in net assets attributable to investments and mortgage loans payable (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total realized and unrealized gains included in changes in net assets	$ (647.3)	$ 151.6	$ (573.3)	$ 229.2
Loans Payable
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total realized and unrealized gains included in changes in net assets	(9.4)	(36.7)	36.3	(66.3)
Real Estate Properties
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total realized and unrealized gains included in changes in net assets	(380.6)	170.3	(232.9)	244.2
Real Estate Joint Ventures
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total realized and unrealized gains included in changes in net assets	(255.6)	(14.7)	(318.2)	(12.2)
Loans Receivable
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total realized and unrealized gains included in changes in net assets	$ (11.1)	$ (4)	$ (22.2)	$ (2.8)

Investments in Joint Ventures -

Investments in Joint Ventures - Narrative (Details)	Jun. 30, 2020
Equity Method Investments and Joint Ventures [Abstract]
Minimum percentage of noncontrolling ownership interest In joint ventures	33.30%
Maximum percentage of noncontrolling ownership interest in joint ventures	98.00%

Investments in Joint Ventures_2

Investments in Joint Ventures - Schedule of results of operations of the joint ventures (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Operating Revenue and Expenses
Revenues Joint Venture	$ 250.8	$ 271.8	$ 536.3	$ 537.9
Expenses	145.3	149.4	299.9	294.7
Excess of revenues over expenses	$ 105.5	$ 122.4	$ 236.4	$ 243.2

Investments in Real Estate Fu_3

Investments in Real Estate Funds (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Variable Interest Entity [Line Items]
Carrying Amount	$ 27,250.5	$ 30,209.9
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Carrying Amount	340.7
Maximum Exposure to Loss	$ 340.7
Variable Interest Entity, Not Primary Beneficiary | LCS SHIP Venture I, LLC
Variable Interest Entity [Line Items]
Account Interest	90.00%
Carrying Amount	$ 193.8
Maximum Exposure to Loss	$ 193.8
Variable Interest Entity, Not Primary Beneficiary | SP V - II, LLC
Variable Interest Entity [Line Items]
Account Interest	61.80%
Carrying Amount	$ 27
Maximum Exposure to Loss	$ 27
Variable Interest Entity, Not Primary Beneficiary | Taconic New York City GP Fund, LP
Variable Interest Entity [Line Items]
Account Interest	60.00%
Carrying Amount	$ 31.9
Maximum Exposure to Loss	$ 31.9
Variable Interest Entity, Not Primary Beneficiary | Veritas Trophy VI, LLC
Variable Interest Entity [Line Items]
Account Interest	90.40%
Carrying Amount	$ 43.5
Maximum Exposure to Loss	$ 43.5
Variable Interest Entity, Not Primary Beneficiary | IDR - Core Property Index Fund, LLC
Variable Interest Entity [Line Items]
Account Interest	1.60%
Carrying Amount	$ 25.2
Maximum Exposure to Loss	$ 25.2
Variable Interest Entity, Not Primary Beneficiary | Grubb Southeast Real Estate Fund VI, LLC
Variable Interest Entity [Line Items]
Account Interest	66.70%
Carrying Amount	$ 15.6
Maximum Exposure to Loss	$ 15.6
Variable Interest Entity, Not Primary Beneficiary | JCR Capital - REA Preferred Equity Parallel Fund
Variable Interest Entity [Line Items]
Account Interest	49.20%
Carrying Amount	$ 3.7
Maximum Exposure to Loss	$ 3.7

Loans Receivable - Scheduled of

Loans Receivable - Scheduled of loans receivable by property type (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal Outstanding	$ 1,602.1	$ 1,573.8
Fair Value	$ 1,578.2	$ 1,572.1
% of Fair Value	100.00%	100.00%
Office
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal Outstanding	$ 787.5	$ 769.3
Fair Value	$ 781.7	$ 768
Office | Credit Concentration Risk | Loans Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
% of Fair Value	49.50%	48.80%
Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal Outstanding	$ 195.7	$ 199.6
Fair Value	$ 195.7	$ 199.6
Industrial | Credit Concentration Risk | Loans Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
% of Fair Value	12.40%	12.70%
Retail
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal Outstanding	$ 139.4	$ 158.5
Fair Value	$ 136.9	$ 158.5
Retail | Credit Concentration Risk | Loans Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
% of Fair Value	8.70%	10.10%
Storage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal Outstanding	$ 82	$ 82
Fair Value	$ 73.8	$ 82
Storage | Credit Concentration Risk | Loans Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
% of Fair Value	4.70%	5.20%
Apartments
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal Outstanding	$ 262.2	$ 229.1
Fair Value	$ 260.2	$ 228.8
Apartments | Credit Concentration Risk | Loans Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
% of Fair Value	16.50%	14.60%
Hotel
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal Outstanding	$ 135.3	$ 135.3
Fair Value	$ 129.9	$ 135.2
Hotel | Credit Concentration Risk | Loans Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
% of Fair Value	8.20%	8.60%

Loans Receivable - Narrative (D

Loans Receivable - Narrative (Details)	6 Months Ended
	Jun. 30, 2020
D Rating
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of days past due, classified as delinquent	90 days

Loans Receivable - Schedule of

Loans Receivable - Schedule of fair values and risk ratings (Details) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2020USD ($)loan	Dec. 31, 2019USD ($)loan
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Loans	27	27
Fair Value | $	$ 1,578.2	$ 1,572.1
% of Fair Value	100.00%	100.00%
Related Party
Financing Receivable, Credit Quality Indicator [Line Items]
Number of loans collateralized by equity interests in real estate investments	2	2
A
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Loans	1	1
Fair Value | $	$ 76.8	$ 48.3
A | Loans Receivable | Credit Concentration Risk
Financing Receivable, Credit Quality Indicator [Line Items]
% of Fair Value	4.90%	3.10%
BBB
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Loans	2	7
Fair Value | $	$ 65.7	$ 456.1
BBB | Loans Receivable | Credit Concentration Risk
Financing Receivable, Credit Quality Indicator [Line Items]
% of Fair Value	4.20%	29.00%
BB
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Loans	15	13
Fair Value | $	$ 930.3	$ 787.4
BB | Loans Receivable | Credit Concentration Risk
Financing Receivable, Credit Quality Indicator [Line Items]
% of Fair Value	58.80%	50.10%
B
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Loans	6	3
Fair Value | $	$ 362.6	$ 205
B | Loans Receivable | Credit Concentration Risk
Financing Receivable, Credit Quality Indicator [Line Items]
% of Fair Value	23.00%	13.00%
D
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Loans	1	0
Fair Value | $	$ 73.8	$ 0
D | Loans Receivable | Credit Concentration Risk
Financing Receivable, Credit Quality Indicator [Line Items]
% of Fair Value	4.70%	0.00%
NR
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Loans	2	3
Fair Value | $	$ 69	$ 75.3
NR | Loans Receivable | Credit Concentration Risk
Financing Receivable, Credit Quality Indicator [Line Items]
% of Fair Value	4.40%	4.80%

Loans Receivable - Schedule o_2

Loans Receivable - Schedule of Loan Receivable in Nonaccrual Status (Details) $ in Millions	Jun. 30, 2020USD ($)loan
Receivables [Abstract]
Number of Loans | loan	1
Principal Outstanding	$ 82
Fair Value	$ 73.8

Loans Payable - Schedule of out

Loans Payable - Schedule of outstanding loans payable (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Loans Payable - Schedule of outstanding mortgage loans payable secured by properties [Line Items]
Total Principal Outstanding	$ 2,466.3	$ 2,338
Fair value adjustment	(9.3)	27
Total Loans Payable	$ 2,457	2,365
Red Canyon at Palomino Park
Loans Payable - Schedule of outstanding mortgage loans payable secured by properties [Line Items]
Annual interest rate	5.34%
Annual interest rate and payment frequency	5.34% paid monthly
Principal amounts outstanding	$ 0	27.1
Maturity	Aug. 1, 2020
Green River at Palomino Park
Loans Payable - Schedule of outstanding mortgage loans payable secured by properties [Line Items]
Annual interest rate	5.34%
Annual interest rate and payment frequency	5.34% paid monthly
Principal amounts outstanding	$ 0	33.2
Maturity	Aug. 1, 2020
Blue Ridge at Palomino Park
Loans Payable - Schedule of outstanding mortgage loans payable secured by properties [Line Items]
Annual interest rate	5.34%
Annual interest rate and payment frequency	5.34% paid monthly
Principal amounts outstanding	$ 0	33.4
Maturity	Aug. 1, 2020
Ashford Meadows Apartments
Loans Payable - Schedule of outstanding mortgage loans payable secured by properties [Line Items]
Annual interest rate	5.17%
Annual interest rate and payment frequency	5.17% paid monthly
Principal amounts outstanding	$ 0	44.6
Maturity	Aug. 1, 2020
The Knoll
Loans Payable - Schedule of outstanding mortgage loans payable secured by properties [Line Items]
Annual interest rate	3.98%
Annual interest rate and payment frequency	3.98% paid monthly
Principal amounts outstanding	$ 0	16.4
Maturity	Dec. 5, 2020
Ascent at Windward
Loans Payable - Schedule of outstanding mortgage loans payable secured by properties [Line Items]
Annual interest rate	3.51%
Annual interest rate and payment frequency	3.51% paid monthly
Principal amounts outstanding	$ 34.6	34.6
Maturity	Jan. 1, 2022
The Palatine
Loans Payable - Schedule of outstanding mortgage loans payable secured by properties [Line Items]
Annual interest rate	4.25%
Annual interest rate and payment frequency	4.25% paid monthly
Principal amounts outstanding	$ 75.1	75.9
Maturity	Jan. 10, 2022
The Forum at Carlsbad
Loans Payable - Schedule of outstanding mortgage loans payable secured by properties [Line Items]
Annual interest rate	4.25%
Annual interest rate and payment frequency	4.25% paid monthly
Principal amounts outstanding	$ 84.8	85.7
Maturity	Mar. 1, 2022
Fusion 1560
Loans Payable - Schedule of outstanding mortgage loans payable secured by properties [Line Items]
Annual interest rate	3.42%
Annual interest rate and payment frequency	3.42% paid monthly
Principal amounts outstanding	$ 37.4	37.4
Maturity	Jun. 10, 2022
San Diego Office Portfolio
Loans Payable - Schedule of outstanding mortgage loans payable secured by properties [Line Items]
Annual interest rate	3.62%
Annual interest rate and payment frequency	3.62% paid monthly
Principal amounts outstanding, loans payable	$ 49.7	48.2
Maturity, loans payable	Aug. 15, 2022
The Colorado
Loans Payable - Schedule of outstanding mortgage loans payable secured by properties [Line Items]
Annual interest rate	3.69%
Annual interest rate and payment frequency	3.69% paid monthly
Principal amounts outstanding	$ 87.3	88.1
Maturity	Nov. 1, 2022
The Legacy at Westwood
Loans Payable - Schedule of outstanding mortgage loans payable secured by properties [Line Items]
Annual interest rate	3.69%
Annual interest rate and payment frequency	3.69% paid monthly
Principal amounts outstanding	$ 44.5	44.9
Maturity	Nov. 1, 2022
Regents Court
Loans Payable - Schedule of outstanding mortgage loans payable secured by properties [Line Items]
Annual interest rate	3.69%
Annual interest rate and payment frequency	3.69% paid monthly
Principal amounts outstanding	$ 37.7	38.1
Maturity	Nov. 1, 2022
1001 Pennsylvania Avenue
Loans Payable - Schedule of outstanding mortgage loans payable secured by properties [Line Items]
Annual interest rate	3.70%
Annual interest rate and payment frequency	3.70% paid monthly
Principal amounts outstanding	$ 317.5	320.7
Maturity	Jun. 1, 2023
Biltmore at Midtown
Loans Payable - Schedule of outstanding mortgage loans payable secured by properties [Line Items]
Annual interest rate	3.94%
Annual interest rate and payment frequency	3.94% paid monthly
Principal amounts outstanding	$ 36.4	36.4
Maturity	Jul. 5, 2023
Cherry Knoll
Loans Payable - Schedule of outstanding mortgage loans payable secured by properties [Line Items]
Annual interest rate	3.78%
Annual interest rate and payment frequency	3.78% paid monthly
Principal amounts outstanding	$ 35.3	35.3
Maturity	Jul. 5, 2023
Lofts at SoDo
Loans Payable - Schedule of outstanding mortgage loans payable secured by properties [Line Items]
Annual interest rate	3.94%
Annual interest rate and payment frequency	3.94% paid monthly
Principal amounts outstanding	$ 35.1	35.1
Maturity	Jul. 5, 2023
Pacific City
Loans Payable - Schedule of outstanding mortgage loans payable secured by properties [Line Items]
Annual interest rate and payment frequency	2.00% + LIBOR paid monthly
Principal amounts outstanding	$ 105	0
Maturity	Oct. 1, 2023
Birkdale Village
Loans Payable - Schedule of outstanding mortgage loans payable secured by properties [Line Items]
Annual interest rate	4.30%
Annual interest rate and payment frequency	4.30% paid monthly
Principal amounts outstanding	$ 77.9	0
Maturity	Apr. 1, 2024
1401 H Street, NW
Loans Payable - Schedule of outstanding mortgage loans payable secured by properties [Line Items]
Annual interest rate	3.65%
Annual interest rate and payment frequency	3.65% paid monthly
Principal amounts outstanding	$ 115	115
Maturity	Nov. 5, 2024
The District at La Frontera | Loan A
Loans Payable - Schedule of outstanding mortgage loans payable secured by properties [Line Items]
Annual interest rate	3.84%
Annual interest rate and payment frequency	3.84% paid monthly
Principal amounts outstanding	$ 39	39.3
Maturity	Dec. 1, 2024
The District at La Frontera | Loan B
Loans Payable - Schedule of outstanding mortgage loans payable secured by properties [Line Items]
Annual interest rate	4.96%
Annual interest rate and payment frequency	4.96% paid monthly
Principal amounts outstanding	$ 4.3	4.4
Maturity	Dec. 1, 2024
Circa Green Lake
Loans Payable - Schedule of outstanding mortgage loans payable secured by properties [Line Items]
Annual interest rate	3.71%
Annual interest rate and payment frequency	3.71% paid monthly
Principal amounts outstanding	$ 52	52
Maturity	Mar. 5, 2025
Union - South Lake Union
Loans Payable - Schedule of outstanding mortgage loans payable secured by properties [Line Items]
Annual interest rate	3.66%
Annual interest rate and payment frequency	3.66% paid monthly
Principal amounts outstanding	$ 57	57
Maturity	Mar. 5, 2025
Holly Street Village
Loans Payable - Schedule of outstanding mortgage loans payable secured by properties [Line Items]
Annual interest rate	3.65%
Annual interest rate and payment frequency	3.65% paid monthly
Principal amounts outstanding	$ 81	81
Maturity	May 1, 2025
Henley at Kingstowne
Loans Payable - Schedule of outstanding mortgage loans payable secured by properties [Line Items]
Annual interest rate	3.60%
Annual interest rate and payment frequency	3.60% paid monthly
Principal amounts outstanding	$ 71	71
Maturity	May 1, 2025
32 South State Street
Loans Payable - Schedule of outstanding mortgage loans payable secured by properties [Line Items]
Annual interest rate	4.48%
Annual interest rate and payment frequency	4.48% paid monthly
Principal amounts outstanding	$ 24	24
Maturity	Jun. 6, 2025
Vista Station Office Portfolio | Loan A
Loans Payable - Schedule of outstanding mortgage loans payable secured by properties [Line Items]
Annual interest rate	4.00%
Annual interest rate and payment frequency	4.00% paid monthly
Principal amounts outstanding	$ 20.2	20.5
Maturity	Jul. 1, 2025
Vista Station Office Portfolio | Loan B
Loans Payable - Schedule of outstanding mortgage loans payable secured by properties [Line Items]
Annual interest rate	4.20%
Annual interest rate and payment frequency	4.20% paid monthly
Principal amounts outstanding	$ 44.3	44.7
Maturity	Nov. 1, 2025
780 Third Avenue | Loan A
Loans Payable - Schedule of outstanding mortgage loans payable secured by properties [Line Items]
Annual interest rate	3.55%
Annual interest rate and payment frequency	3.55% paid monthly
Principal amounts outstanding	$ 150	150
Maturity	Aug. 1, 2025
780 Third Avenue | Loan B
Loans Payable - Schedule of outstanding mortgage loans payable secured by properties [Line Items]
Annual interest rate	3.55%
Annual interest rate and payment frequency	3.55% paid monthly
Principal amounts outstanding	$ 20	20
Maturity	Aug. 1, 2025
701 Brickell Avenue
Loans Payable - Schedule of outstanding mortgage loans payable secured by properties [Line Items]
Annual interest rate	3.66%
Annual interest rate and payment frequency	3.66% paid monthly
Principal amounts outstanding	$ 184	184
Maturity	Apr. 1, 2026
Marketplace at Mill Creek
Loans Payable - Schedule of outstanding mortgage loans payable secured by properties [Line Items]
Annual interest rate	3.82%
Annual interest rate and payment frequency	3.82% paid monthly
Principal amounts outstanding	$ 39.6	0
Maturity	Sep. 11, 2027
Overlook At King Of Prussia
Loans Payable - Schedule of outstanding mortgage loans payable secured by properties [Line Items]
Annual interest rate	3.82%
Annual interest rate and payment frequency	3.82% paid monthly
Principal amounts outstanding	$ 40.8	0
Maturity	Sep. 11, 2027
Winslow Bay
Loans Payable - Schedule of outstanding mortgage loans payable secured by properties [Line Items]
Annual interest rate	3.82%
Annual interest rate and payment frequency	3.82% paid monthly
Principal amounts outstanding	$ 25.8	0
Maturity	Sep. 11, 2027
1900 K Street, NW
Loans Payable - Schedule of outstanding mortgage loans payable secured by properties [Line Items]
Annual interest rate	3.93%
Annual interest rate and payment frequency	3.93% paid monthly
Principal amounts outstanding	$ 163	163
Maturity	Apr. 1, 2028
99 High Street
Loans Payable - Schedule of outstanding mortgage loans payable secured by properties [Line Items]
Annual interest rate	3.90%
Annual interest rate and payment frequency	3.90% paid monthly
Principal amounts outstanding	$ 277	$ 277
Maturity	Mar. 1, 2030
LIBOR | Pacific City
Loans Payable - Schedule of outstanding mortgage loans payable secured by properties [Line Items]
Basis spread on variable rate	2.00%

Line of Credit - Narrative (Det

Line of Credit - Narrative (Details) - Unsecured Revolving Credit Facility - Line of Credit	Sep. 20, 2018USD ($)loanterminstitution	Jun. 30, 2020USD ($)	Jun. 30, 2020USD ($)
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 500,000,000
Number of financial institutions | institution	4
Maximum borrowing capacity, per lender	$ 125,000,000
Number of extension periods | term	2
Extension period	12 months
Additional borrowing capacity	$ 250,000,000
Unused commitment fee, percentage	0.20%
Unused borrowing capacity, fee		$ 800,000	$ 1,600,000
Line of credit, loans outstanding		$ 291,000,000	$ 291,000,000
Eurodollar Loan
Debt Instrument [Line Items]
Minimum funding requirement	$ 5,000,000
Line of credit, term (or less)	12 months
Maximum active loan limit | loan	5
Eurodollar Loan | Minimum | Adjusted LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	0.85%
Eurodollar Loan | Maximum | Adjusted LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.05%
Alternate Base Rate Loan
Debt Instrument [Line Items]
Minimum funding requirement	$ 5,000,000
Alternate Base Rate Loan | Adjusted LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.00%
Alternate Base Rate Loan | Federal Reserve Bank of New York
Debt Instrument [Line Items]
Basis spread on variable rate	0.50%

Financial Highlights - Schedule

Financial Highlights - Schedule of condensed financial information for an accumulation unit of the account (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019
Per Accumulation Unit Data:
Rental income (in dollars per share)	$ 10.598	$ 18.165	$ 17.757	$ 17.132
Real estate property level expenses and taxes (in dollars per share)	4.926	8.734	8.548	7.722
Real estate income, net (in dollars per share)	5.672	9.431	9.209	9.410
Other income (in dollars per share)	2.650	6.752	6.162	4.762
Total income (in dollars per share)	8.322	16.183	15.371	14.172
Expense charges (in dollars per share)	1.691	3.439	3.161	3.318
Investment income, net (in dollars per share)	6.631	12.744	12.210	10.854
Net realized and unrealized gain on investments and loans payable (in dollars per share)	(12.609)	10.262	6.877	5.839
Net increase in Accumulation Unit Value (in dollars per share)	(5.978)	23.006	19.087	16.693
Accumulation Unit Value:
Beginning of period (in dollars per share)	440.422	417.416	398.329	381.636
End of period (in dollars per share)	$ 434.444	$ 440.422	$ 417.416	$ 398.329
Total return	(1.36%)	5.51%	4.79%	4.37%
Ratios to Average net assets:
Expenses	0.75%	0.78%	0.76%	0.83%
Investment income, net	2.95%	2.90%	2.95%	2.72%
Portfolio turnover rate:
Real estate properties	5.60%	7.80%	11.80%	2.70%
Marketable securities	76.80%	28.70%	5.10%	5.70%
Accumulation Units outstanding at end of period (millions) (in shares)	54.5	60.8	60.7	61.3
Net assets end of period (millions)	$ 24,212.8	$ 27,307.9	$ 25,842.6	$ 24,942.6	$ 26,015.1	$ 26,732.6	$ 26,321.7

Accumulation Units - Schedule o

Accumulation Units - Schedule of changes in the number of accumulation units outstanding (Details) - shares shares in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Outstanding:
Beginning of period (in shares)	60.8	60.7
Credited for premiums (in shares)	2.6	6.2
Annuity, other periodic payments, withdrawals and death benefits (in shares)	(8.9)	(6.1)
End of period (in shares)	54.5	60.8

Commitments and Contingencies -

Commitments and Contingencies - Schedule of limited partners' callable commitments (Details) - USD ($)	1 Months Ended	6 Months Ended	12 Months Ended
	Aug. 31, 2019	Jun. 30, 2020	Dec. 31, 2019
Limited Partners' Capital Account [Line Items]
TOTAL COMMITMENTS		$ 868,700,000	$ 678,800,000
Real Estate Funds
Limited Partners' Capital Account [Line Items]
TOTAL COMMITMENTS		779,100,000	586,800,000
Real Estate Funds | Taconic New York City GP Fund
Limited Partners' Capital Account [Line Items]
TOTAL COMMITMENTS		6,000,000	11,400,000
Real Estate Funds | LCS SHIP Venture I, LLC
Limited Partners' Capital Account [Line Items]
TOTAL COMMITMENTS		28,100,000	28,100,000
Real Estate Funds | Veritas Trophy VI, LLC
Limited Partners' Capital Account [Line Items]
TOTAL COMMITMENTS		41,800,000	35,800,000
Right to call capital, period from initial contribution date	18 months
Reduction to committed capital, if no capital call in initial contribution period	$ 15,000,000
If capital call occurs, modified commitment period, from first call date	3 years
Real Estate Funds | SP V - II, LLC
Limited Partners' Capital Account [Line Items]
TOTAL COMMITMENTS		73,800,000	74,900,000
Real Estate Funds | Grubb Southeast Real Estate Fund VI, LLC
Limited Partners' Capital Account [Line Items]
TOTAL COMMITMENTS		83,600,000	86,600,000
Real Estate Funds | JCR Capital - REA Preferred Equity Parallel Fund
Limited Partners' Capital Account [Line Items]
TOTAL COMMITMENTS		95,800,000	100,000,000
Real Estate Funds | Townsend Strategic Ventures LP
Limited Partners' Capital Account [Line Items]
TOTAL COMMITMENTS		250,000,000	250,000,000
Real Estate Funds | Silverpeak NRE Fund Co, LLC
Limited Partners' Capital Account [Line Items]
TOTAL COMMITMENTS		100,000,000	0
Real Estate Funds | TREA Flagler Venture, LLC
Limited Partners' Capital Account [Line Items]
TOTAL COMMITMENTS		100,000,000	0
Loans Receivable
Limited Partners' Capital Account [Line Items]
TOTAL COMMITMENTS		89,600,000	92,000,000
Loans Receivable | 311 South Wacker Mezzanine
Limited Partners' Capital Account [Line Items]
TOTAL COMMITMENTS		5,700,000	7,600,000
Loans Receivable | Rosemont Towson Mezzanine
Limited Partners' Capital Account [Line Items]
TOTAL COMMITMENTS		1,200,000	1,200,000
Loans Receivable | 1330 Broadway Mezzanine
Limited Partners' Capital Account [Line Items]
TOTAL COMMITMENTS		14,000,000	14,000,000
Loans Receivable | SCG Oakland Portfolio Mezzanine
Limited Partners' Capital Account [Line Items]
TOTAL COMMITMENTS		6,900,000	7,000,000
Loans Receivable | BREP VIII Industrial Mezzanine
Limited Partners' Capital Account [Line Items]
TOTAL COMMITMENTS		14,100,000	14,100,000
Loans Receivable | San Diego Office Portfolio Senior Loan
Limited Partners' Capital Account [Line Items]
TOTAL COMMITMENTS		8,500,000	10,000,000
Loans Receivable | San Diego Office Portfolio Mezzanine
Limited Partners' Capital Account [Line Items]
TOTAL COMMITMENTS		2,800,000	3,300,000
Loans Receivable | MRA Hub 34 Holding, LLC
Limited Partners' Capital Account [Line Items]
TOTAL COMMITMENTS		1,500,000	1,500,000
Loans Receivable | Liberty Park Mezzanine
Limited Partners' Capital Account [Line Items]
TOTAL COMMITMENTS		4,200,000	5,000,000
Loans Receivable | Colony New England Hotel Portfolio Senior Loan
Limited Partners' Capital Account [Line Items]
TOTAL COMMITMENTS		14,100,000	14,100,000
Loans Receivable | Colony New England Hotel Portfolio Mezzanine
Limited Partners' Capital Account [Line Items]
TOTAL COMMITMENTS		4,700,000	4,700,000
Loans Receivable | Exo Apartments Senior Loan
Limited Partners' Capital Account [Line Items]
TOTAL COMMITMENTS		7,100,000	7,100,000
Loans Receivable | Exo Apartments Mezzanine
Limited Partners' Capital Account [Line Items]
TOTAL COMMITMENTS		2,400,000	2,400,000
Loans Receivable | Five Oak Mezzanine
Limited Partners' Capital Account [Line Items]
TOTAL COMMITMENTS		$ 2,400,000	$ 0