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Mortgage Notes Payable (Details)
$ in Thousands

12 Months Ended

Dec. 31, 2015

USD ($)

buildings

Dec. 31, 2014

USD ($)

Mortgage Loans on Real Estate [Line Items]

Collateral for mortgage notes payable | buildings

1

Mortgage notes payable, net

$ 418,052

$ 417,194

Debt Instrument, Unamortized Discount (Premium), Net

4,175

4,025

Loans Payable

414,546

414,500

Carrying Amount, Mortgaged Properties

$ 619,400

607,800

The Army Navy Club Building [Member]

Mortgage Loans on Real Estate [Line Items]

Debt Instrument, Issuance Date

^[1]

Mar. 26, 2014

Mortgage note, fair value interest rate

^[2]

3.18%

Mortgage notes payable, net

$ 51,000

Debt Instrument, Maturity Date

May 01, 2017

Loans Payable

$ 50,750

51,844

Yale West [Member]

Mortgage Loans on Real Estate [Line Items]

Debt Instrument, Issuance Date

^[1]

Feb. 21, 2014

Mortgage note, fair value interest rate

^[2]

3.75%

Mortgage notes payable, net

$ 51,900

Debt Instrument, Maturity Date

Jan. 31, 2022

Loans Payable

$ 47,502

47,903

Six Fifty North Glebe Road [Member]

Mortgage Loans on Real Estate [Line Items]

Debt Instrument, Issuance Date

^[1],[3],[4]

Feb. 21, 2013

Mortgage note, fair value interest rate

^[2],[3],[4]

2.27%

Mortgage notes payable, net

$ 32,214

27,690

Debt Instrument, Maturity Date

^[3],[4]

Jan. 27, 2016

Loans Payable

$ 32,248

27,690

^[1],[2]

John Marshall II Member

Mortgage Loans on Real Estate [Line Items]

Debt Instrument, Issuance Date

^[1]

Sep. 15, 2011

Mortgage note, fair value interest rate

^[2]

5.79%

Mortgage notes payable, net

$ 50,100

Debt Instrument, Maturity Date

Feb. 08, 2016

Loans Payable

$ 51,011

51,810

Olney Village Center Member

Mortgage Loans on Real Estate [Line Items]

Debt Instrument, Issuance Date

^[1]

Aug. 30, 2011

Mortgage note, fair value interest rate

^[2]

4.94%

Mortgage notes payable, net

$ 17,300

Debt Instrument, Maturity Date

Oct. 01, 2023

Loans Payable

$ 16,503

18,053

Kenmore Apartments [Member]

Mortgage Loans on Real Estate [Line Items]

Debt Instrument, Issuance Date

^[1]

Feb. 02, 2009

Mortgage note, fair value interest rate

^[2]

5.37%

Debt Instrument, Maturity Date

Mar. 01, 2019

Loans Payable

$ 33,637

34,305

2445 M Street [Member]

Mortgage Loans on Real Estate [Line Items]

Debt Instrument, Issuance Date

^[1],[4]

Dec. 02, 2008

Mortgage note, fair value interest rate

^[2],[4]

7.25%

Mortgage notes payable, net

$ 100,600

Debt Instrument, Maturity Date

^[4]

Jan. 06, 2017

Loans Payable

^[4]

$ 101,866

101,866

3801 Connecticut, Walker House, Bethesda Hill [Member]

Mortgage Loans on Real Estate [Line Items]

Debt Instrument, Issuance Date

^[1],[5]

May 29, 2008

Mortgage note, fair value interest rate

^[2],[5]

5.71%

Debt Instrument, Maturity Date

^[5]

Jun. 01, 2016

Loans Payable

^[5]

$ 81,029

81,029

Extension term

1 year

London Interbank Offered Rate (LIBOR) [Member] | Six Fifty North Glebe Road [Member]

Mortgage Loans on Real Estate [Line Items]

Spread on variable rate

2.00%

New Accounting Pronouncement, Early Adoption, Effect [Member]

Mortgage Loans on Real Estate [Line Items]

Deferred Finance Costs, Net

$ 5,126

5,390

Mortgage payable

Mortgage Loans on Real Estate [Line Items]

Mortgage notes payable, net

418,052

417,194

Deferred Finance Costs, Net

669

1,331

Mortgage payable | New Accounting Pronouncement, Early Adoption, Effect [Member]

Mortgage Loans on Real Estate [Line Items]

Mortgage notes payable, net

418,721

418,525

Deferred Finance Costs, Net

$ 669

$ 1,331

[1]	Each of these mortgages was assumed with the acquisition of the collateralized properties, except for the mortgage notes secured by 3801 Connecticut Avenue, Walker House, Bethesda Hill, Kenmore Apartments, and the construction loan secured by the development project at The Maxwell, which were originally executed by Washington REIT. We record mortgages assumed in an acquisition at fair value.
[2]	Yield on the assumption/issuance date, including the effects of any premiums, discounts or fair value adjustments on the notes.
[3]	Interest rate on The Maxwell construction loan was variable, based on LIBOR plus 2.0%. Interest and principal was payable monthly starting March 2016 until the extended maturity date of February 20, 2017, upon which all unpaid principal and interest were payable in full. In January 2016, Washington REIT exercised its right to purchase the construction loan without penalty from the lender (see note 3, under "Variable Interest Entities").
[4]	The maturity date of the mortgage note is January 1, 2052, but can be prepaid, without penalty, beginning on January 31, 2022.
[5]	Interest only is payable monthly until the maturity date, which can be extended for one year upon which the interest rate is reset on June 1, 2016. At maturity on June 1, 2017, all unpaid principal and interest are payable in full.

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