REAL ESTATE – The developer of One57, slated to become New York City’s tallest residential building, has raised the asking price for the six-bedroom penthouse overlooking Central Park by 12 per cent, to $110 million.

The previous price for the 11,000-square-foot unit, which will take up the tower’s 89th and 90th floors, was $98.5 million, according to Gary Barnett, president of the Extell Development Co. Prices have gone up an average of 3.9 per cent for the building’s 95 condominiums since sales began about a month ago, he said.

“Given where the market is, we’re being very conservative on pricing,” Barnett said.

A sale at that price would make it the most expensive deal for a single residence ever in Manhattan, according to Jonathan Miller, president of New York appraiser Miller Samuel Inc.