Jeff Blau is mystery buyer of $51M Upper East Side townhouse

Related chief has listed co-op for $34.5 million and is looking to move into seven-story mansion

From left: Jeff Blau and 113-115 East 70th Street
From left: Jeff Blau and 113-115 East 70th Street

Jeff Blau, the chief executive officer of Related Companies, is the mystery buyer of the city’s second-priciest townhouse.

Blau, it turns out, bought the $51 million mansion at 113-115 East 70th Street a year ago from former Coach executive director and fashion designer Reed Krakoff, according to the New York Daily News.

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The Hudson Yards developer, who joined Related in the early 1990s and rose through the ranks,  bought the seven-story home under a limited liability company, the newspaper reported.

Blau and his wife are currently renovating and are planning to move into the Upper East Side mansion. They’ve listed their co-op at 1040 Fifth Avenue for $34.5 million with CORE’s Emily Beare.

The Harkness Mansion, which private equity mogul J. Christopher Flowers bought in 2006 for $53 million, still holds the record for most expensive mansion ever sold in New York City. [NYDN] — Claire Moses