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QUARTERLY FINANCIAL DATA (Unaudited): (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
QUARTERLY FINANCIAL DATA (Unaudited): |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 18,990 | $ 18,021 | $ 17,233 | $ 16,344 | $ 18,495 | $ 16,108 | $ 15,782 | $ 15,326 | $ 70,588 | $ 65,711 | $ 60,477
Net income | 4,414 | 4,323 | 12,459 | 3,285 | 5,195 | 3,791 | 3,714 | 9,207 | 24,481 | 21,907 | 22,210
Net income attributable to One Liberty Properties, Inc. | $ 4,395 | $ 4,299 | $ 12,441 | $ 3,287 | $ 5,191 | $ 3,788 | $ 3,682 | $ 7,856 | $ 24,422 | $ 20,517 | $ 22,116
Weighted average number of common shares outstanding: |  |  |  |  |  |  |  |  |  |  |
Basic (in shares) | 17,255 | 16,845 | 16,579 | 16,388 | 16,204 | 16,014 | 15,883 | 15,776 | 16,768 | 15,971 | 15,563
Diluted (in shares) | 17,369 | 16,962 | 16,686 | 16,495 | 16,312 | 16,114 | 15,983 | 15,876 | 16,882 | 16,079 | 15,663
Net income per common share attributable to common stockholders: |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 0.24 | $ 0.24 | $ 0.72 | $ 0.19 | $ 0.31 | $ 0.22 | $ 0.22 | $ 0.48 | $ 1.40 | $ 1.23 | $ 1.37
Diluted (in dollars per share) | $ 0.24 | $ 0.24 | $ 0.72 | $ 0.18 | $ 0.31 | $ 0.22 | $ 0.22 | $ 0.48 | $ 1.39 | $ 1.22 | $ 1.37
Gain on real estate |  |  | $ 8,918 |  |  |  |  | $ 5,392 |  |  |
Lease termination fees |  |  |  |  | $ 2,236 |  |  | 650 |  | $ 2,886 | $ 1,269
Prepayment costs on debt |  |  |  |  |  |  |  | 472 | $ 577 | $ 568 | $ 1,581
Write off of Deferred Debt Issuance Cost |  |  |  |  |  |  |  | 249 |  |  |
Non-controlling interest's share of income from the transaction |  |  |  |  |  |  |  | $ 1,320 |  |  |

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