Real Estate Acquired and Sold	9 Months Ended
Sep. 30, 2017
Business Combinations [Abstract]
Real Estate Acquired and Sold	Real Estate Acquired and Sold 700 N. Glebe Road In August 2016, the Company purchased for $7.2 million, including acquisition costs, 700 N. Glebe Road in Arlington, Virginia. The property is contiguous with three other properties owned by the Company. Thruway Pad In August 2016, the Company purchased for $3.1 million, a retail pad site with an occupied bank building in Winston Salem, North Carolina, and incurred acquisition costs of $60,400. The property is contiguous with and an expansion of the Company's Thruway asset. Beacon Center In November 2016, the Company purchased for $22.5 million the land underlying Beacon Center. The land was previously leased by the Company with an annual rent of approximately $60,000. The purchase price was funded in part by an $11.25 million increase to the existing mortgage collateralized by Beacon Center and in part by the revolving credit facility. Southdale In November 2016, the Company purchased for $15.0 million the land underlying Southdale. The land was previously leased by the Company with an annual rent of approximately $60,000. The purchase price was funded by the revolving credit facility. Burtonsville Town Square In January 2017, the Company purchased for $76.4 million, including acquisition costs, Burtonsville Town Square located in Burtonsville, Maryland. Olney Shopping Center In March 2017, the Company purchased for $3.0 million the land underlying Olney Shopping Center. The land was previously leased by the Company with an annual rent of approximately $56,000. The purchase price was funded by the revolving credit facility. Crosstown Business Center In December 2016, the Company sold for $5.4 million the197,100 square foot Crosstown Business Center located in Tulsa, Oklahoma and recognized a $1.0 million gain. Great Eastern Shopping Center In September 2017, the Company sold for $8.5 million the 255,400 square foot Great Eastern Shopping Center located in District Heights, Maryland. The Company provided $1.28 million second trust financing to the buyer, which bears interest at a fixed rate of 6%, matures in March 2018 and can be extended for six months at the option of the buyer. A $0.5 million gain realized on the sale was deferred and will be recognized when the loan is repaid by the buyer. Allocation of Purchase Price of Real Estate Acquired The Company allocates the purchase price of real estate investment properties to various components, such as land, buildings and intangibles related to in-place leases and customer relationships, based on their relative fair values or fair values. See Note 2. Summary of Significant Accounting Policies-Real Estate Investment Properties. During 2016, the Company purchased two properties at a cost of $10.3 million and incurred acquisition costs of $60,400. Of the total purchase price, $9.4 million was allocated to land, $0.9 million was allocated to buildings, $0.1 million was allocated to in-place leases and ($0.1) million was allocated to below market rent. During 2017, the Company purchased one property at a cost of $76.4 million, including acquisition costs. Of the total purchase price, $45.8 million was allocated to building, $28.4 million was allocated to land, $0.6 million was allocated to above-market leases, $2.2 million was allocated to in-place leases and $(0.6) million was allocated to below market rent.

Real Estate Acquired and Sold

700 N. Glebe Road

In August 2016, the Company purchased for $7.2 million, including acquisition costs, 700 N. Glebe Road in Arlington, Virginia. The property is contiguous with three other properties owned by the Company.

Thruway Pad

In August 2016, the Company purchased for $3.1 million, a retail pad site with an occupied bank building in

Winston Salem, North Carolina, and incurred acquisition costs of $60,400. The property is contiguous with and an expansion of the Company's Thruway asset.

Beacon Center

In November 2016, the Company purchased for $22.5 million the land underlying Beacon Center. The land was previously leased by the Company with an annual rent of approximately $60,000. The purchase price was funded in part by an $11.25 million increase to the existing mortgage collateralized by Beacon Center and in part by the revolving credit facility.

Southdale

In November 2016, the Company purchased for $15.0 million the land underlying Southdale. The land was previously leased by the Company with an annual rent of approximately $60,000. The purchase price was funded by the revolving credit facility.

Burtonsville Town Square

In January 2017, the Company purchased for $76.4 million, including acquisition costs, Burtonsville Town Square located in Burtonsville, Maryland.

Olney Shopping Center

In March 2017, the Company purchased for $3.0 million the land underlying Olney Shopping Center. The land was previously leased by the Company with an annual rent of approximately $56,000. The purchase price was funded by the revolving credit facility.

Crosstown Business Center

In December 2016, the Company sold for $5.4 million the197,100 square foot Crosstown Business Center located in Tulsa, Oklahoma and recognized a $1.0 million gain.

Great Eastern Shopping Center

In September 2017, the Company sold for $8.5 million the 255,400 square foot Great Eastern Shopping Center located in District Heights, Maryland. The Company provided $1.28 million second trust financing to the buyer, which bears interest at a fixed rate of 6%, matures in March 2018 and can be extended for six months at the option of the buyer. A $0.5 million gain realized on the sale was deferred and will be recognized when the loan is repaid by the buyer.

Allocation of Purchase Price of Real Estate Acquired

The Company allocates the purchase price of real estate investment properties to various components, such as land, buildings and intangibles related to in-place leases and customer relationships, based on their relative fair values or fair values. See Note 2. Summary of Significant Accounting Policies-Real Estate Investment Properties.

During 2016, the Company purchased two properties at a cost of $10.3 million and incurred acquisition costs of $60,400. Of the total purchase price, $9.4 million was allocated to land, $0.9 million was allocated to buildings, $0.1 million was allocated to in-place leases and ($0.1) million was allocated to below market rent.

During 2017, the Company purchased one property at a cost of $76.4 million, including acquisition costs. Of the total purchase price, $45.8 million was allocated to building, $28.4 million was allocated to land, $0.6 million was allocated to above-market leases, $2.2 million was allocated to in-place leases and $(0.6) million was allocated to below market rent.