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Financial Highlights (Tables)
 12 Months Ended
Dec. 31, 2019
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.
 
 
Years ended December 31,
2019
 
2018
 
2017
 
2016
 
2015
Per Accumulation Unit Data:
 
 
 
 
 
 
 
 
 
 
Rental income
 
$
18.165

 
$
17.757

 
$
17.132

 
$
16.433

 
$
15.538

Real estate property level expenses and taxes
 
8.734

 
8.548

 
7.722

 
7.534

 
7.319

Real estate income, net
 
9.431

 
9.209

 
9.410

 
8.899

 
8.219

Other income
 
6.752

 
6.162

 
4.762

 
3.594

 
3.342

Total income
 
16.183

 
15.371

 
14.172

 
12.493

 
11.561

Expense charges(1)
 
3.439

 
3.161

 
3.318

 
3.290

 
3.092

Investment income, net
 
12.744

 
12.210

 
10.854

 
9.203

 
8.469

Net realized and unrealized gain on investments and loans payable
 
10.262

 
6.877

 
5.839

 
9.660

 
18.911

Net increase in Accumulation Unit Value
 
23.006

 
19.087

 
16.693

 
18.863

 
27.380

Accumulation Unit Value:
 
 
 
 
 
 
 
 
 
 
Beginning of period
 
417.416

 
398.329

 
381.636

 
362.773

 
335.393

End of period
 
$
440.422

 
$
417.416

 
$
398.329

 
$
381.636

 
$
362.773

Total return
 
5.51
%
 
4.79
%
 
4.37
%
 
5.20
%
 
8.16
%
Ratios to Average net Assets:
 
 
 
 
 
 
 
 
 
 
Expenses(1)
 
0.78
%
 
0.76
%
 
0.83
%
 
0.86
%
 
0.86
%
Investment income, net
 
2.90
%
 
2.95
%
 
2.72
%
 
2.41
%
 
2.37
%
Portfolio turnover rate:
 
 
 
 
 
 
 
 
 
 
Real estate properties(2)
 
7.8
%
 
11.8
%
 
2.7
%
 
1.3
%
 
5.7
%
Marketable securities(3)
 
28.7
%
 
5.1
%
 
5.7
%
 
3.5
%
 
10.0
%
Accumulation Units outstanding at end of period (millions):
 
60.8

 
60.7

 
61.3

 
62.4

 
60.4

Net assets end of period (millions)
 
$
27,307.9

 
$
25,842.6

 
$
24,942.6

 
$
24,304.7

 
$
22,360.0

(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) 
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 joint venture and Funds investments) by the average value of the portfolio of real estate investments held during the period.
(3) 
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.