The 'Sex and the City' actress - who has three children, James, eight, and 17-month-old twins, Tabitha and Marion, with husband Matthew Broderick - is moving from her current home in the West Village area of the city to 88 Central Park West.
According to The New York Observer newspaper, the new home - the former residence of philanthropist Laurie Tisch - features a 32-foot long living room, eight bedrooms, five bathrooms and five "half" bathrooms.
In addition, there are two walk-in wardrobes in the master bedroom of the property, which has seen its price drop by $3.5 million since August.
Although the purchase of the new house is believed to be complete, it comes after a long search to find a different New York home by Sarah Jessica and Matthew.
Earlier this year, they were believed to have been keen on a huge $24 million townhouse, as well as a penthouse on 54 Bond Street.
They were also rumoured to be interested in Madonna's old home in Central Park West, but nothing happened because the co-operative board of the building were angry about the 'Celebration' singer's constant noisy construction work.