California investment firm Prana Investments has acquired a five-building Harlem apartment portfolio for $13.75 million Cignature Realty brokered the sale of the portfolio that includes one six-story multifamily elevator building, one six-story multifamily apartment building, two five-story multifamily apartment buildings and one five-story mixed-use apartment building with a total of 105 apartments and two retail stores. The buildings, 55 West 129th Street, 216 and 224 West