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Construction Backlog | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016
Construction Backlog [Abstract] |  |
Construction Backlog |
9. | Construction Backlog
The following represents the backlog of signed engineering contracts in existence at March 31, 2017 and December 31, 2016:
|  | March 31, 2017 |  |  | December 31, 2016 |
Balance – beginning of period |  | $ | 541,291 |  |  | $ | 105,851 |
New contracts and change orders during the period |  |  | 306,097 |  |  |  | 807,786 |
|  |  | 847,388 |  |  |  | 913,637 |
Less: contract revenue earned during the period |  |  | (84,635 | ) |  |  | (372,346 | )
|  |  | 762,753 |  |  |  | 541,291 |
Contracts signed but not started |  |  | - |  |  |  | - |
Balance – end of period |  | $ | 762,753 |  |  | $ | 541,291 |
As of March 31, 2017, the Company has $116,754 in deferred revenue which represents unearned billings on SG Blocks sales which the Company anticipates to be recognized during the year ending December 31, 2017. In addition, between April 1, 2017 and May 3, 2017, the Company entered into additional engineering and SG Blocks sale contracts with revenues of $2,544,266. |
12. | Construction Backlog
The following represents the backlog of signed engineering and project management contracts in existence at December 31, 2016 and 2015:
|  |  | Successor 2016 |  |  | Predecessor 2015 |
| Balance - January 1 |  | $ | 105,851 |  |  | $ | 6,200 |
| New contracts and change orders during the period |  |  | 807,786 |  |  |  | 172,805 |
|  |  |  | 913,637 |  |  |  | 179,005 |
| Less: contract revenue earned during the period |  |  | (372,346 | ) |  |  | (73,154 | )
|  |  |  | 541,291 |  |  |  | 105,851 |
| Contracts signed but not started |  |  | - |  |  |  | - |
| Balance - December 31 |  | $ | 541,291 |  |  | $ | 105,851 |

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