The average sales price of an apartment in Manhattan is expected to top $US2 million ($A2.7 million) for the first time, but prices are expected to level off in 2017 after nearly doubling over the past decade.

Prices were pushed higher by a jump in sales of condominiums valued at $US10 million ($A13 million) or more, which skewed results, CityRealty, a real estate listings and data website for New York City, said. The opening of 432 Park Avenue, a 96-story tower marketed by developers as the tallest…