Manhattan’s multifamily market decelerated in 2016 from a blockbuster 2015, but pricing remained steady, according to a new year-end report from Ariel Property Advisors. The multifamily market saw $6.9 billion in dollar volume for the year, accounting for 24 percent of the borough’s investment sales. There were 245 multifamily deals involving 323 properties, a drop of 16 and 32 percent respectively from 2015, and beneath 2014 levels as well.