what was the increase in payroll and related withholdings in 2014 , in millions?
american tower corporation and subsidiaries notes to consolidated financial statements acquisition accounting upon closing of the acquisition . based on current estimates , the company expects the value of potential contingent consideration payments required to be made under these agreements to be between zero and $ 4.4 million . during the year ended december 31 , 2014 , the company ( i ) recorded a decrease in fair value of $ 1.7 million in other operating expenses in the accompanying consolidated statements of operations , ( ii ) recorded settlements under these agreements of $ 3.5 million , ( iii ) reduced its contingent consideration liability by $ 0.7 million as a portion of the company 2019s obligations was assumed by the buyer in conjunction with the sale of operations in panama and ( iv ) recorded additional liability of $ 0.1 million . as a result , the company estimates the value of potential contingent consideration payments required under these agreements to be $ 2.3 million using a probability weighted average of the expected outcomes as of december 31 , 2014 . other u.s . 2014in connection with other acquisitions in the united states , the company is required to make additional payments if certain pre-designated tenant leases commence during a specified period of time . during the year ended december 31 , 2014 , the company recorded $ 6.3 million of contingent consideration liability as part of the preliminary acquisition accounting upon closing of certain acquisitions . during the year ended december 31 , 2014 , the company recorded settlements under these agreements of $ 0.4 million . based on current estimates , the company expects the value of potential contingent consideration payments required to be made under these agreements to be between zero and $ 5.9 million and estimates it to be $ 5.9 million using a probability weighted average of the expected outcomes as of december 31 , 2014 . for more information regarding contingent consideration , see note 12 . 7 . accrued expenses accrued expenses consists of the following as of december 31 , ( in thousands ) : .

|  | 2014 | 2013 (1) |
| :--- | :--- | :--- |
| Accrued property and real estate taxes | $61,206 | $54,529 |
| Payroll and related withholdings | 57,110 | 50,843 |
| Accrued construction costs | 46,024 | 52,446 |
| Accrued rent | 34,074 | 28,456 |
| Other accrued expenses | 219,340 | 234,914 |
| Balance as of December 31, | $417,754 | $421,188 |

( 1 ) december 31 , 2013 balances have been revised to reflect purchase accounting measurement period adjustments. .

payroll_2014 = 57110
payroll_2013 = 50843
payroll_increase = payroll_2014 - payroll_2013
answer = payroll_increase