CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014		Dec. 31, 2013
Cash flows from operating activities:
Net Income		$ 23,691,000	$ 51,551,000	[1]	$ 13,169,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		22,198,000	20,975,000		18,843,000
Amortization of debt premium		(225,000)	(312,000)		(433,000)
Stock-based compensation expense		427,000	399,000		375,000
Gain on property exchange		(8,742,000)
Gain on divestiture of real property	[1]		(13,043,000)
Gains on purchase of minority interests in majority-owned LLCs	[1]		(25,409,000)
Changes in assets and liabilities:
Rent receivable		(290,000)	(555,000)		(746,000)
Accrued expenses and other liabilities		(184,000)	(509,000)		523,000
Tenant reserves, escrows, deposits and prepaid rents		1,781,000	(303,000)		16,000
Accrued interest		(41,000)	(62,000)		(22,000)
Other, net		(437,000)	64,000		(431,000)
Net cash provided by operating activities		38,178,000	32,796,000		31,294,000
Cash flows from investing activities:
Investments in LLCs		(667,000)	(1,337,000)		(3,013,000)
Repayments of advances made to LLCs		306,000			114,000
Advances made to LLCs		(22,795,000)			(4,580,000)
Cash distributions in excess of income from LLCs		224,000	1,029,000		2,346,000
Cash distribution of refinancing proceeds from LLCs		1,045,000	2,280,000
Additions to real estate investments, net		(5,257,000)	(2,866,000)		(3,415,000)
Cash received for property exchange		2,000,000	17,300,000		0
Deposits on real estate assets		(150,000)	(100,000)		(150,000)
Net cash paid for acquisition of properties		(16,765,000)	(15,600,000)		(4,675,000)
Cash paid to acquire minority interests in majority-owned LLCs		(2,250,000)	(4,744,000)
Net cash used in investing activities		(44,309,000)	(4,038,000)		(13,373,000)
Cash flows from financing activities:
Net borrowings/(repayments) on line of credit		(52,400,000)	3,950,000		(11,950,000)
Proceeds from mortgages and other notes payable		5,200,000			11,150,000
Repayments of mortgages and other notes payable		(17,826,000)	(12,327,000)		(14,401,000)
Financing costs paid		(1,114,000)			(95,000)
Dividends paid		(34,089,000)	(32,718,000)		(31,751,000)
Partial settlement of dividends equivalent rights		(75,000)	(94,000)		(101,000)
Issuance of shares of beneficial interest, net		1,668,000	19,274,000		5,757,000
Net cash provided by/(used in) financing activities		6,164,000	(29,815,000)		(17,491,000)
Increase/(decrease) in cash and cash equivalents		33,000	(1,057,000)		430,000
Increase/(decrease) in cash due to recording of LLCs on a consolidated/unconsolidated basis			1,581,000		(141,000)
Cash and cash equivalents, beginning of period		3,861,000	3,337,000		3,048,000
Cash and cash equivalents, end of period		3,894,000	3,861,000		3,337,000
Supplemental disclosures of cash flow information:
Interest paid		8,025,000	8,268,000		7,517,000
Property Exchange Transaction:
Net assets acquired in property exchange		9,886,000
Net assets relinquished in property exchange		$ (3,144,000)
Consolidation Of Limited Liability Companies
Supplemental disclosures of non-cash transactions:
Net real estate investments			84,064,000
Cash and cash equivalents			1,581,000
Intangible assets			6,490,000
Rent receivable - other			388,000
Deferred charges and other assets, net			100,000
Investment in LLCs			(28,616,000)
Mortgage and other notes payable, non-recourse to us			(29,758,000)
Accrued interest			(116,000)
Accrued expenses and other liabilities			(1,245,000)
Tenant reserves, escrows, deposits and prepaid rents			(485,000)
Note payable to previous third-party member			(2,250,000)
Gains on purchases of minority interests in majority-owned LLCs			(25,409,000)
Cash paid for purchase of minority interests in majority-owned LLCs			$ 4,744,000
Deconsolidation of Limited Liability Companies
Supplemental disclosures of non-cash transactions:
Net real estate investments					11,597,000
Cash and cash equivalents					141,000
Rent receivable - other					207,000
Deferred charges and other assets, net					135,000
Investment in LLCs					5,443,000
Mortgage and other notes payable, non-recourse to us					(6,215,000)
Other liabilities					(368,000)
Third-party equity interest					$ (54,000)

[1] We began to account for Palmdale Medical Properties and Sparks Medical Properties on a consolidated basis effective January 1, 2014. Additionally, we began to account for six LLCs (Desert Valley Medical Center, Santa Fe Professional Plaza, Rosenberg Children’s Medical Plaza, Sierra San Antonio Medical Plaza, Phoenix Children’s East Valley Care Center and 3811 E. Bell Medical Building Medical Plaza) on a consolidated basis as of August 1, 2014.