article_snippet.sent: The replacement of the mansion 30-year-old roof, which is being done by Nicholson and Galloway, should cost an additional $3.4 million, officials said.
article_snippet.sent: The roof was frequently overmatched during rain storms, forcing city work crews to be dispatched to patch problem areas multiple times this winter, officials said.
article_snippet.sent: And officials said that about 10 of the building's windows were undergoing upgrades to become energy-efficient at the cost of another $13,000.
article_snippet.sent: de Blasio predecessor, Michael Bloomberg, earmarked $3 million to the Parks Department capital budget in 2012 to replace The roof.
highlights_snippet.sent: Work will take place at same time as replacement of the mansion 30-year-old roof .
  