SIGNIFICANT ACCOUNTING POLICIES (Details) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Nov. 30, 2019 USD ($) home	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	May 31, 2020 USD ($)	Apr. 30, 2020	Jan. 01, 2020 USD ($)	Dec. 31, 2019 USD ($)
Accounting policies
Allocation of other comprehensive income/(loss)		$ 100	$ (100)	$ 39
Recognition of operating lease right-of-use assets		201,754		201,754					$ 204,225
Recognition of operating lease liabilities		196,346		196,346					198,558
Significant Accounting Policies
Notes receivable		157,785		157,785					153,650
Allowance for credit losses		(789)		(789)
Notes receivable, net		156,996		156,996					153,650
Note receivable interest income		2,000	$ 1,200	7,000	$ 3,500
Interest Income, Related Party				0	0
Current Income Tax Expense (Benefit)				0
Deferred tax liabilities, net		(2,800)		(2,800)
Unrecognized tax benefit, accrued interest or penalties due to examination		0		0
Adjustment to rental income		4,400		12,900
Adjustment to income (loss)		400		900
Bellevue, WA 259 Home Community
Significant Accounting Policies
Number of apartment homes | home	259
Note due April 2020
Significant Accounting Policies
Notes receivable		$ 20,000		$ 20,000
Note receivable interest rate							8.00%
Note due October 2020
Significant Accounting Policies
Notes receivable									2,250
Note receivable interest rate		8.00%		8.00%
Note due February 2021
Significant Accounting Policies
Notes receivable		$ 4,000		$ 4,000
Aggregate commitment on note receivable						$ 4,000
Note due May 2022
Significant Accounting Policies
Notes receivable		$ 20,000		$ 20,000					20,000
Note receivable interest rate		8.00%		8.00%
Note due October 2022
Significant Accounting Policies
Notes receivable		$ 115,000		$ 115,000					115,000
Note receivable interest rate		4.75%		4.75%
Note due October 2022 | Bellevue, WA 259 Home Community
Significant Accounting Policies
Aggregate commitment on note receivable	$ 115,000
Deposit made under purchase option agreement	10,000
Payment to acquire real estate	$ 170,000
Maturity date extension term	10 years
Loan interest term	3 years
Amortization schedule term	30 years
Note due January 2023
Significant Accounting Policies
Notes receivable		$ 18,785		$ 18,785					16,400
Notes receivable, net		18,800		18,800
Aggregate commitment on note receivable		$ 20,000		$ 20,000
Note receivable interest rate		10.00%		10.00%
Additional amount loaned				$ 2,400
Note maturity public capital threshold				5,000
Multifamily tenant lease
Significant Accounting Policies
Increase in reserves		$ 4,000		9,500
Retail tenant lease
Significant Accounting Policies
Increase in reserves		800		4,300
Straight-line lease
Significant Accounting Policies
Allowance for doubtful accounts		2,900		2,900
Maximum
Accounting policies
Credit loss		100		100
Significant Accounting Policies
Deferred tax liabilities, net									$ (1,600)
Maximum | Straight-line lease
Significant Accounting Policies
Allowance for doubtful accounts		$ 100		100
ASU 2016-13 | Adjustment
Accounting policies
Retained earnings								$ 2,200
Noncontrolling Interests
Accounting policies
Allocation of other comprehensive income/(loss)					$ (700)
Noncontrolling Interests | Maximum
Accounting policies
Allocation of other comprehensive income/(loss)				$ 100