The estate of late Microsoft co-founder Paul Allen has executed what could be the most expensive co-op sale in New York’s history. Two apartments at 4 East 66th Street on the Upper East Side traded for $101 million, the Wall Street Journal reported. The outlet noted that if considered as one property, the sale smashed the previous co-op record set in 2015 at $77.5 million, according to real estate appraiser Jonathan Miller. The sale includes The post Microsoft co-founder Paul Allen’s estate sells UES units for $101M appeared first on The Real Deal New York.