Consolidated Statements of Cash Flows - USD ($)	3 Months Ended				9 Months Ended		48 Months Ended
	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:
Net (loss) income	$ (5,330,000)	$ (1,256,000)	$ 2,856,000	$ 291,623,000	$ (10,627,000)	$ 347,046,000
Adjustments to reconcile net income to net cash provided by operating activities:
Deferred rent and amortization of intangible assets, liabilities and lease inducements					(1,013,000)	(2,019,000)
Depreciation and amortization	5,273,000		5,180,000		15,728,000	21,995,000
Reclassification from AOCI to interest expense			0		0	(1,806,000)
Reclassification from other assets to interest expense for swap termination					0	1,421,000
Change in fair value of swaps					0	209,000
Gain on sale of real estate	0		(302,000)		0	(433,104,000)
Impairment of real estate	0		0		0	69,000,000
Loss on early extinguishment of debt	281,000		0		281,000	29,982,000
Amortization of deferred loan costs					859,000	864,000
Amortization of premiums and discounts on debt					(97,000)	(150,000)
Unrealized premium adjustment					844,000	1,293,000
Amortization and accretion on loans receivable, net					(290,000)	(250,000)
Bad debt expense					2,311,000	73,000
Deferred income taxes					(915,000)	(76,000)
Stock-based compensation					167,000	138,000
Loans funded, held for sale to secondary market					(24,122,000)	(20,566,000)
Proceeds from sale of guaranteed loans					17,159,000	29,716,000
Principal collected on loans subject to secured borrowings					3,600,000	2,477,000
Other operating activity					(813,000)	(581,000)
Changes in operating assets and liabilities:
Accounts receivable and interest receivable					(60,000)	1,604,000
Other assets					1,159,000	2,065,000
Accounts payable and accrued expenses					598,000	(3,224,000)
Deferred leasing costs					(440,000)	(1,296,000)
Other liabilities					(870,000)	(7,956,000)
Due to related parties					3,710,000	(4,292,000)
Net cash provided by operating activities					7,169,000	32,563,000
CASH FLOWS FROM INVESTING ACTIVITIES:
Additions to investments in real estate					(13,210,000)	(19,946,000)
Proceeds from sale of real estate, net					0	941,032,000
Loans funded					(24,057,000)	(6,855,000)
Principal collected on loans					5,292,000	5,916,000
Other investing activity					81,000	354,000
Net cash (used in) provided by investing activities					(31,894,000)	920,501,000
CASH FLOWS FROM FINANCING ACTIVITIES:
Payment of unsecured revolving lines of credit, revolving credit facility and or term note					(48,000,000)	(135,500,000)
Proceeds from unsecured revolving lines of credit, revolving credit facility and or term note					61,500,000	74,000,000
Payment of mortgages payable					0	(46,000,000)
Investments in marketable securities in connection with the legal defeasance of mortgages payable					0	(268,194,000)
Prepayment penalties and other payments for early extinguishment of debt					0	(5,660,000)
Payment of principal on SBA 7(a) loan-backed notes					(7,159,000)	(7,625,000)
Borrowed funds from the Federal Reserve through the Paycheck Protection Program Liquidity Facility					16,016,000	0
Payment of principal on secured borrowings					(3,600,000)	(2,477,000)
Payment of deferred preferred stock offering costs					(683,000)	(497,000)
Payment of deferred loan costs					(535,000)	(34,000)
Payment of other deferred costs					(205,000)	(383,000)
Payment of common dividends					(3,319,274)	(12,045,000)
Payment of special cash dividends					0	(613,294,000)
Net proceeds from issuance of Series A Preferred Warrants					29,000	295,000
Payment of preferred stock dividends					(14,464,000)	(17,095,000)
Redemption of Series A Preferred Stock					(1,681,000)	(156,000)
Retirement of fractional shares of Common Stock					0	(1,000)
Noncontrolling interests’ distributions					(45,000)	(515,000)
Noncontrolling interests’ contributions					0	455,000
Net cash provided by (used in) financing activities					30,766,000	(1,006,191,000)
Change in cash balances included in assets held for sale					0	755,000
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH					6,041,000	(52,372,000)
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH:
Beginning of period		35,947,000		77,171,000	35,947,000	77,171,000
End of period	41,988,000		24,799,000		41,988,000	24,799,000	$ 41,988,000
RECONCILIATION OF CASH AND CASH EQUIVALENTS AND RESTRICTED CASH TO THE CONSOLIDATED BALANCE SHEETS:
Cash and cash equivalents								$ 32,111,000	$ 23,801,000	$ 13,292,000
Restricted cash								9,877,000	12,146,000	11,507,000
Total cash and cash equivalents and restricted cash	41,988,000	35,947,000	24,799,000	77,171,000	41,988,000	24,799,000	41,988,000	$ 41,988,000	$ 35,947,000	$ 24,799,000
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash paid during the period for interest					7,952,000	10,788,000
Federal income taxes paid					273,000	850,000
SUPPLEMENTAL DISCLOSURES OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Additions to investments in real estate included in accounts payable and accrued expenses					1,047,000	3,275,000
Additions to deferred costs included in accounts payable and accrued expenses					221,000	344,000
Additions to preferred stock offering costs included in accounts payable and accrued expenses					653,000	467,000
Accrual of dividends payable to preferred stockholders					2,715,000	1,318,000
Preferred stock offering costs offset against redeemable preferred stock in temporary equity					451,000	249,000
Preferred stock offering costs offset against redeemable preferred stock in permanent equity					4,000	3,000
Reclassification of Series A Preferred Stock from temporary equity to permanent equity	10,747,000	6,948,000	$ 7,014,000	$ 8,890,000	27,434,000	26,729,000	$ 92,387,000
Additions to deferred loan costs included in accounts payable and accrued expenses					140,000	0
Reclassification of loans receivable, net to real estate owned					174,000	243,000
Establishment of right-of use asset and lease liability					0	362,000
Marketable securities transferred in connection with the legal defeasance of mortgages payable					0	268,194,000
Mortgage notes payable legally defeased					0	245,000,000
Mortgage note assumed in connection with our sale of real estate					0	28,200,000
Redeemable preferred stock deemed dividends	$ 87,000	$ 161,000			300,000	0
Issuance of shares of Common Stock for asset management fees					2,359,000	0
Payment of management fees and base service fee in preferred stock					2,663,000	0
Series A Preferred Stock
CASH FLOWS FROM FINANCING ACTIVITIES:
Net proceeds from issuance of Series Preferred Stock					32,466,000	28,535,000
SUPPLEMENTAL DISCLOSURES OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Redeemable Preferred Stock fees included in accounts payable and accrued expenses					386,000	0
Series D Preferred Stock
CASH FLOWS FROM FINANCING ACTIVITIES:
Net proceeds from issuance of Series Preferred Stock					446,000	0
SUPPLEMENTAL DISCLOSURES OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Redeemable Preferred Stock fees included in accounts payable and accrued expenses					$ 6,000	$ 0