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Mortgage Notes Payable, Revolving Credit Facility, Interest Expense and Amortization of Deferred Debt Costs - Summary of Notes Payable (Additional Information) (Detail) |  |  |  |  |  | 12 Months Ended |  |
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Oct. 25, 2013 USD ($) | Sep. 04, 2013 USD ($) | May. 28, 2013 USD ($) | Mar. 19, 2013 USD ($) | Feb. 27, 2013 USD ($) | Dec. 31, 2015 USD ($) note Store | Dec. 31, 2014 | Dec. 31, 2012 USD ($)
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 3.75% | 3.65% |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  | $ 246,552,000 |  |
Northrock |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Amortization period |  |  |  |  |  | 25 years |  |  |
Debt instrument final payment |  |  |  |  |  | $ 14,200,000 |  |  |
Debt instrument amount |  |  |  |  |  | $ 15,000,000 |  |  |
Interest rate spread on LIBOR |  |  |  |  |  | 1.65% |  |  |
Metro Pike Center |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Amortization period |  |  |  |  |  | 25 years |  |  |
Debt instrument final payment |  |  |  |  |  | $ 14,800,000 |  |  |
Debt instrument amount |  |  |  |  |  | $ 15,600,000 |  |  |
Interest rate spread on LIBOR |  |  |  |  |  | 1.65% |  |  |
4.04% due April 2028 | Hampshire Langley |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Principal and interest payments |  |  |  |  | $ 95,400 |  |  |  |
Debt instrument final payment |  |  |  |  | 9,500,000 |  |  |  |
Debt instrument amount |  |  |  |  | $ 18,000,000 |  |  |  |
3.51% due June 2028 | Beacon Center |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Principal and interest payments |  |  |  | $ 203,200 |  |  |  |  |
Amortization period |  |  |  | 20 years |  |  |  |  |
Debt instrument final payment |  |  |  | $ 11,400,000 |  |  |  |  |
Debt instrument amount |  |  |  | $ 35,000,000 |  |  |  |  |
3.99% due September 2028 | Seabreeze Plaza |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument amount |  |  | $ 18,000,000 |  |  |  |  |  |
4.88% due September 2032 | Park Van Ness |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Amortization period |  | 25 years |  |  |  |  |  |  |
Fixed Rate Mortgage Notes Payable |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Interest rate | [1] |  |  |  |  |  | 5.53% |  |
Fixed Rate Mortgage Notes Payable | 7.45% due June 2015 |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Interest rate | [1] |  |  |  |  |  | 7.45% |  |
Fixed Rate Mortgage Notes Payable | 7.45% due June 2015 | Shops at Fairfax and Boulevard |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Principal and interest payments |  |  |  |  |  |  | $ 156,000 |  |
Amortization period |  |  |  |  |  |  | 23 years |  |
Debt instrument final payment |  |  |  |  |  |  | $ 15,200,000 |  |
Fixed Rate Mortgage Notes Payable | 6.01% due February 2018 |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Interest rate | [1] |  |  |  |  |  | 6.01% |  |
Fixed Rate Mortgage Notes Payable | 6.01% due February 2018 | Washington Square |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Principal and interest payments |  |  |  |  |  |  | $ 264,000 |  |
Amortization period |  |  |  |  |  |  | 27 years 6 months |  |
Debt instrument final payment |  |  |  |  |  |  | $ 28,000,000 |  |
Amortization of principal |  |  |  |  |  |  | $ 1,300,000 |  |
Fixed Rate Mortgage Notes Payable | 5.88% due January 2019 |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Interest rate | [1] |  |  |  |  |  | 5.88% |  |
Fixed Rate Mortgage Notes Payable | 5.88% due January 2019 | Broadlands Village, The Glen and Kentlands Square I |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Principal and interest payments |  |  |  |  |  |  | $ 306,000 |  |
Amortization period |  |  |  |  |  |  | 25 years |  |
Debt instrument final payment |  |  |  |  |  |  | $ 28,400,000 |  |
Amortization of principal |  |  |  |  |  |  | $ 1,600,000 |  |
Number of shopping centers | Store |  |  |  |  |  |  | 3 |  |
Fixed Rate Mortgage Notes Payable | 5.76% due May 2019 |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Interest rate | [1] |  |  |  |  |  | 5.76% |  |
Fixed Rate Mortgage Notes Payable | 5.76% due May 2019 | Olde Forte Village |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Principal and interest payments |  |  |  |  |  |  | $ 98,000 |  |
Amortization period |  |  |  |  |  |  | 25 years |  |
Debt instrument final payment |  |  |  |  |  |  | $ 9,000,000 |  |
Amortization of principal |  |  |  |  |  |  | $ 526,000 |  |
Fixed Rate Mortgage Notes Payable | 5.62% due July 2019 |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Interest rate | [1] |  |  |  |  |  | 5.62% |  |
Fixed Rate Mortgage Notes Payable | 5.62% due July 2019 | Countryside |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Principal and interest payments |  |  |  |  |  |  | $ 133,000 |  |
Amortization period |  |  |  |  |  |  | 25 years |  |
Debt instrument final payment |  |  |  |  |  |  | $ 12,300,000 |  |
Amortization of principal |  |  |  |  |  |  | $ 721,000 |  |
Fixed Rate Mortgage Notes Payable | 5.79% due September 2019 |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Interest rate | [1] |  |  |  |  |  | 5.79% |  |
Fixed Rate Mortgage Notes Payable | 5.79% due September 2019 | Briggs Chancy MarketPlace |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Principal and interest payments |  |  |  |  |  |  | $ 133,000 |  |
Amortization period |  |  |  |  |  |  | 25 years |  |
Debt instrument final payment |  |  |  |  |  |  | $ 12,200,000 |  |
Amortization of principal |  |  |  |  |  |  | $ 697,000 |  |
Fixed Rate Mortgage Notes Payable | 5.22% due January 2020 |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Interest rate | [1] |  |  |  |  |  | 5.22% |  |
Fixed Rate Mortgage Notes Payable | 5.22% due January 2020 | Shops at Monocacy |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Principal and interest payments |  |  |  |  |  |  | $ 112,000 |  |
Amortization period |  |  |  |  |  |  | 25 years |  |
Debt instrument final payment |  |  |  |  |  |  | $ 10,600,000 |  |
Amortization of principal |  |  |  |  |  |  | $ 627,000 |  |
Fixed Rate Mortgage Notes Payable | 5.60% due May 2020 |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Interest rate | [1] |  |  |  |  |  | 5.60% |  |
Fixed Rate Mortgage Notes Payable | 5.60% due May 2020 | Boca Valley Plaza |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Principal and interest payments |  |  |  |  |  |  | $ 75,000 |  |
Amortization period |  |  |  |  |  |  | 30 years |  |
Debt instrument final payment |  |  |  |  |  |  | $ 9,100,000 |  |
Amortization of principal |  |  |  |  |  |  | $ 294,000 |  |
Fixed Rate Mortgage Notes Payable | 5.30% due June 2020 |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Interest rate | [1] |  |  |  |  |  | 5.30% |  |
Fixed Rate Mortgage Notes Payable | 5.30% due June 2020 | Palm Springs Center |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Principal and interest payments |  |  |  |  |  |  | $ 75,000 |  |
Amortization period |  |  |  |  |  |  | 25 years |  |
Debt instrument final payment |  |  |  |  |  |  | $ 7,100,000 |  |
Amortization of principal |  |  |  |  |  |  | $ 408,000 |  |
Fixed Rate Mortgage Notes Payable | 5.83% due July 2020 |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Interest rate | [1] |  |  |  |  |  | 5.83% |  |
Fixed Rate Mortgage Notes Payable | 5.83% due July 2020 | Thruway |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Principal and interest payments |  |  |  |  |  |  | $ 289,000 |  |
Amortization period |  |  |  |  |  |  | 25 years |  |
Debt instrument final payment |  |  |  |  |  |  | $ 34,800,000 |  |
Amortization of principal |  |  |  |  |  |  | $ 1,081,000 |  |
Fixed Rate Mortgage Notes Payable | 5.81% due February 2021 |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Interest rate | [1] |  |  |  |  |  | 5.81% |  |
Fixed Rate Mortgage Notes Payable | 5.81% due February 2021 | Jamestown Place |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Principal and interest payments |  |  |  |  |  |  | $ 66,000 |  |
Amortization period |  |  |  |  |  |  | 25 years |  |
Debt instrument final payment |  |  |  |  |  |  | $ 6,100,000 |  |
Amortization of principal |  |  |  |  |  |  | $ 321,000 |  |
Fixed Rate Mortgage Notes Payable | 6.01% due August 2021 |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Interest rate | [1] |  |  |  |  |  | 6.01% |  |
Fixed Rate Mortgage Notes Payable | 6.01% due August 2021 | Hunt Club Corners |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Principal and interest payments |  |  |  |  |  |  | $ 42,000 |  |
Amortization period |  |  |  |  |  |  | 30 years |  |
Debt instrument final payment |  |  |  |  |  |  | $ 5,000,000 |  |
Amortization of principal |  |  |  |  |  |  | $ 141,000 |  |
Fixed Rate Mortgage Notes Payable | 5.62% due June 2022 |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Interest rate | [1] |  |  |  |  |  | 5.62% |  |
Fixed Rate Mortgage Notes Payable | 5.62% due June 2022 | Landsowne Town Center |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Principal and interest payments |  |  |  |  |  |  | $ 230,000 |  |
Amortization period |  |  |  |  |  |  | 30 years |  |
Debt instrument final payment |  |  |  |  |  |  | $ 28,200,000 |  |
Amortization of principal |  |  |  |  |  |  | $ 802,000 |  |
Fixed Rate Mortgage Notes Payable | 6.08% due September 2022 |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Interest rate | [1] |  |  |  |  |  | 6.08% |  |
Fixed Rate Mortgage Notes Payable | 6.08% due September 2022 | Orchard Park |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Principal and interest payments |  |  |  |  |  |  | $ 73,000 |  |
Amortization period |  |  |  |  |  |  | 30 years |  |
Debt instrument final payment |  |  |  |  |  |  | $ 8,600,000 |  |
Amortization of principal |  |  |  |  |  |  | $ 226,000 |  |
Fixed Rate Mortgage Notes Payable | 6.43% due April 2023 |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Interest rate | [1] |  |  |  |  |  | 6.43% |  |
Fixed Rate Mortgage Notes Payable | 6.43% due April 2023 | BJs Wholesale |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Principal and interest payments |  |  |  |  |  |  | $ 80,000 |  |
Amortization period |  |  |  |  |  |  | 30 years |  |
Debt instrument final payment |  |  |  |  |  |  | $ 9,300,000 |  |
Amortization of principal |  |  |  |  |  |  | $ 222,000 |  |
Fixed Rate Mortgage Notes Payable | 6.28% due February 2024 |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Interest rate | [1] |  |  |  |  |  | 6.28% |  |
Fixed Rate Mortgage Notes Payable | 6.28% due February 2024 | Great Falls Shopping Center |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Principal and interest payments |  |  |  |  |  |  | $ 138,000 |  |
Amortization period |  |  |  |  |  |  | 26 years |  |
Debt instrument final payment |  |  |  |  |  |  | $ 6,300,000 |  |
Amortization of principal |  |  |  |  |  |  | $ 732,000 |  |
Number of notes | note |  |  |  |  |  |  | 3 |  |
Fixed Rate Mortgage Notes Payable | 7.35% due June 2024 |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Interest rate | [1] |  |  |  |  |  | 7.35% |  |
Fixed Rate Mortgage Notes Payable | 7.35% due June 2024 | Leesburg Pike |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Principal and interest payments |  |  |  |  |  |  | $ 135,000 |  |
Amortization period |  |  |  |  |  |  | 25 years |  |
Debt instrument final payment |  |  |  |  |  |  | $ 11,500,000 |  |
Amortization of principal |  |  |  |  |  |  | $ 402,000 |  |
Fixed Rate Mortgage Notes Payable | 7.60% due June 2024 |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Interest rate | [1] |  |  |  |  |  | 7.60% |  |
Fixed Rate Mortgage Notes Payable | 7.60% due June 2024 | Village Center |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Principal and interest payments |  |  |  |  |  |  | $ 119,000 |  |
Amortization period |  |  |  |  |  |  | 25 years |  |
Debt instrument final payment |  |  |  |  |  |  | $ 10,100,000 |  |
Amortization of principal |  |  |  |  |  |  | $ 338,000 |  |
Fixed Rate Mortgage Notes Payable | 7.02% due July 2024 |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Interest rate | [1] |  |  |  |  |  | 7.02% |  |
Fixed Rate Mortgage Notes Payable | 7.02% due July 2024 | White Oak Shopping Center |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Principal and interest payments |  |  |  |  |  |  | $ 193,000 |  |
Amortization period |  |  |  |  |  |  | 24 years 4 months 24 days |  |
Debt instrument final payment |  |  |  |  |  |  | $ 18,500,000 |  |
Amortization of principal |  |  |  |  |  |  | $ 551,000 |  |
Debt instrument amount |  |  |  |  |  |  |  |  | $ 10,500,000
Fixed Rate Mortgage Notes Payable | 7.45% due July 2024 |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Interest rate | [1] |  |  |  |  |  | 7.45% |  |
Fixed Rate Mortgage Notes Payable | 7.45% due July 2024 | Avenel Business Park |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Principal and interest payments |  |  |  |  |  |  | $ 246,000 |  |
Amortization period |  |  |  |  |  |  | 25 years |  |
Debt instrument final payment |  |  |  |  |  |  | $ 20,900,000 |  |
Amortization of principal |  |  |  |  |  |  | $ 715,000 |  |
Fixed Rate Mortgage Notes Payable | 7.30% due January 2025 |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Interest rate | [1] |  |  |  |  |  | 7.30% |  |
Fixed Rate Mortgage Notes Payable | 7.30% due January 2025 | Ashburn Village |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Principal and interest payments |  |  |  |  |  |  | $ 240,000 |  |
Amortization period |  |  |  |  |  |  | 25 years |  |
Debt instrument final payment |  |  |  |  |  |  | $ 20,500,000 |  |
Amortization of principal |  |  |  |  |  |  | $ 689,000 |  |
Fixed Rate Mortgage Notes Payable | 6.18% due January 2026 |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Interest rate | [1] |  |  |  |  |  | 6.18% |  |
Fixed Rate Mortgage Notes Payable | 6.18% due January 2026 | Ravenwood |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Principal and interest payments |  |  |  |  |  |  | $ 111,000 |  |
Amortization period |  |  |  |  |  |  | 25 years |  |
Debt instrument final payment |  |  |  |  |  |  | $ 10,100,000 |  |
Amortization of principal |  |  |  |  |  |  | $ 375,000 |  |
Fixed Rate Mortgage Notes Payable | 5.31% due April 2026 |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Interest rate | [1] |  |  |  |  |  | 5.31% |  |
Fixed Rate Mortgage Notes Payable | 5.31% due April 2026 | Clarendon Center |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Principal and interest payments |  |  |  |  |  |  | $ 753,000 |  |
Amortization period |  |  |  |  |  |  | 25 years |  |
Debt instrument final payment |  |  |  |  |  |  | $ 70,500,000 |  |
Amortization of principal |  |  |  |  |  |  | $ 3,000,000 |  |
Fixed Rate Mortgage Notes Payable | 4.30% due October 2026 |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Interest rate | [1] |  |  |  |  |  | 4.30% |  |
Fixed Rate Mortgage Notes Payable | 4.30% due October 2026 | Severna Park Market Place |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Principal and interest payments |  |  |  |  |  |  | $ 207,000 |  |
Amortization period |  |  |  |  |  |  | 25 years |  |
Debt instrument final payment |  |  |  |  |  |  | $ 20,300,000 |  |
Amortization of principal |  |  |  |  |  |  | $ 992,000 |  |
Fixed Rate Mortgage Notes Payable | 4.53% due November 2026 |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Interest rate | [1] |  |  |  |  |  | 4.53% |  |
Fixed Rate Mortgage Notes Payable | 4.53% due November 2026 | Kentlands Square II |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Principal and interest payments |  |  |  |  |  |  | $ 240,000 |  |
Amortization period |  |  |  |  |  |  | 25 years |  |
Debt instrument final payment |  |  |  |  |  |  | $ 23,100,000 |  |
Amortization of principal |  |  |  |  |  |  | $ 1,090,000 |  |
Fixed Rate Mortgage Notes Payable | 4.70% due December 2026 |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Interest rate | [1] |  |  |  |  |  | 4.70% |  |
Fixed Rate Mortgage Notes Payable | 4.70% due December 2026 | Cranberry Square |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Principal and interest payments |  |  |  |  |  |  | $ 113,000 |  |
Amortization period |  |  |  |  |  |  | 25 years |  |
Debt instrument final payment |  |  |  |  |  |  | $ 10,900,000 |  |
Amortization of principal |  |  |  |  |  |  | $ 495,000 |  |
Fixed Rate Mortgage Notes Payable | 5.84% due May 2027 |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Interest rate | [1] |  |  |  |  |  | 5.84% |  |
Fixed Rate Mortgage Notes Payable | 5.84% due May 2027 | Seven Corners |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Principal and interest payments |  |  |  |  |  |  | $ 463,200 |  |
Amortization period |  |  |  |  |  |  | 25 years |  |
Debt instrument final payment |  |  |  |  |  |  | $ 42,300,000 |  |
Amortization of principal |  |  |  |  |  |  | 1,500,000 |  |
Debt instrument amount |  |  |  |  |  |  | $ 73,000,000 |  |
Fixed Rate Mortgage Notes Payable | 4.04% due April 2028 |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Interest rate | [1] |  |  |  |  |  | 4.04% |  |
Fixed Rate Mortgage Notes Payable | 4.04% due April 2028 | Hampshire Langley |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Principal and interest payments |  |  |  |  |  |  | $ 95,400 |  |
Amortization period |  |  |  |  | 25 years |  |  |  |
Debt instrument final payment |  |  |  |  |  |  | 9,500,000 |  |
Amortization of principal |  |  |  |  |  |  | $ 455,000 |  |
Fixed Rate Mortgage Notes Payable | 3.51% due June 2028 |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Interest rate | [1] |  |  |  |  |  | 3.51% |  |
Fixed Rate Mortgage Notes Payable | 3.51% due June 2028 | Beacon Center |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Principal and interest payments |  |  |  |  |  |  | $ 203,200 |  |
Amortization period |  |  |  |  |  |  | 20 years |  |
Debt instrument final payment |  |  |  |  |  |  | $ 11,400,000 |  |
Amortization of principal |  |  |  |  |  |  | $ 1,296,000 |  |
Fixed Rate Mortgage Notes Payable | 3.99% due September 2028 |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Interest rate | [1] |  |  |  |  |  | 3.99% |  |
Fixed Rate Mortgage Notes Payable | 3.99% due September 2028 | Seabreeze Plaza |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Principal and interest payments |  |  | $ 94,900 |  |  |  | $ 94,900 |  |
Amortization period |  |  | 25 years |  |  |  | 25 years |  |
Debt instrument final payment |  |  | $ 9,500,000 |  |  |  | $ 9,500,000 |  |
Amortization of principal |  |  |  |  |  |  | $ 451,000 |  |
Fixed Rate Mortgage Notes Payable | 3.69% Due March 2030 |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Interest rate | [1] |  |  |  |  |  | 3.69% |  |
Fixed Rate Mortgage Notes Payable | 3.69% Due March 2030 | Shops at Fairfax and Boulevard |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Principal and interest payments |  |  |  |  |  |  | $ 153,300 |  |
Amortization period |  |  |  |  |  |  | 25 years |  |
Debt instrument final payment |  |  |  |  |  |  | $ 15,500,000 |  |
Amortization of principal |  |  |  |  |  |  | 556,000 |  |
Debt instrument amount |  |  |  |  |  |  | $ 30,000,000.0 |  |
Fixed Rate Mortgage Notes Payable | 3.99% Due April 2030 |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Interest rate | [1] |  |  |  |  |  | 3.99% |  |
Fixed Rate Mortgage Notes Payable | 3.99% Due April 2030 | Northrock |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Principal and interest payments |  |  |  |  |  |  | $ 84,400 |  |
Amortization period |  |  |  |  |  |  | 25 years |  |
Debt instrument final payment |  |  |  |  |  |  | $ 8,400,000 |  |
Amortization of principal |  |  |  |  |  |  | 252,000 |  |
Debt instrument amount |  |  |  |  |  |  | $ 16,000,000.0 |  |
Fixed Rate Mortgage Notes Payable | 4.88% due September 2032 |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Interest rate | [1] |  |  |  |  |  | 4.88% |  |
Fixed Rate Mortgage Notes Payable | 4.88% due September 2032 | Park Van Ness |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Principal and interest payments |  |  |  |  |  |  | $ 413,500 |  |
Amortization period |  |  |  |  |  |  | 25 years |  |
Debt instrument final payment |  |  |  |  |  |  | $ 39,600,000 |  |
Debt instrument amount |  | $ 71,600,000 |  |  |  |  | $ 71,600,000 |  |
Fixed Rate Mortgage Notes Payable | 8.00% due April 2034 |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Interest rate | [1] |  |  |  |  |  | 8.00% |  |
Fixed Rate Mortgage Notes Payable | 8.00% due April 2034 | Olney |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Principal and interest payments |  |  |  |  |  |  | $ 60,400 |  |
Debt instrument final payment |  |  |  |  |  |  | $ 14,700,000 |  |
Fixed rate increase on note |  |  |  |  |  |  | 1.50% |  |
Interest rate |  |  |  |  |  |  | 8.00% |  |
Amortization of debt discount (premium) |  |  |  |  |  |  | $ (163,000) |  |
Variable Rate Loans Payable |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Interest rate spread on LIBOR | [1] |  |  |  |  |  | 1.94% |  |
Variable Rate Loans Payable | Revolving credit facility |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  | $ 275,000,000 |  |
Debt maturity extension period |  |  |  |  |  |  | 1 year |  |
Debt instrument fee |  |  |  |  |  |  | 0.15% |  |
Interest rate spread on LIBOR | [1] |  |  |  |  |  | 1.45% |  |
Debt instrument frequency of periodic payment |  |  |  |  |  |  | Monthly |  |
Variable Rate Loans Payable | Northrock Loan |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Interest rate spread on LIBOR | [1] |  |  |  |  |  | 1.65% |  |
Variable Rate Loans Payable | Northrock Loan | Northrock |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Principal and interest payments |  |  |  |  |  |  | $ 47,000 |  |
Debt instrument final payment |  |  |  |  |  |  | $ 14,200,000 |  |
Variable Rate Loans Payable | Metro Pike Center Bank Loan |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Interest rate spread on LIBOR | [1] |  |  |  |  |  | 1.65% |  |
Variable Rate Loans Payable | Metro Pike Center Bank Loan | Metro Pike Center |  |  |  |  |  |  |  |  |
Notes Payable [Line Items] |  |  |  |  |  |  |  |  |
Principal and interest payments |  |  |  |  |  |  | $ 48,000 |  |
Debt instrument final payment |  |  |  |  |  |  | 14,800,000 |  |
Amortization of principal |  |  |  |  |  |  | $ 305,000 |  |
[1] | Interest rate and scheduled maturity data presented as of December 31, 2015. Totals computed using weighted averages.

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