NEW YORK CITY — Cignature Realty Associates has brokered the $6 million sale of a five-story multifamily building on the Upper East Side of Manhattan. The 8,648-square-foot building is located at 319 E. 93rd St. and was built in 1920. The property includes 10 apartments. Christopher Skitch of Cignature Realty represented the sellers, Diana Cormack and Jonathan Bradshaw, in the transaction. Peter Vanderpool of Cignature represented the buyer, 319 East 93rd Street LLC.