The landmarked Helmsley Building is up for grabs, and it could sell for more than $1.1 billion, or $800 per square foot. The 1.4 million-square-foot beauty straddles Park Avenue just north of Grand Central, and is currently owned by by Invesco Ltd. and Monday Properties, with South Korea's National Pension Service also owning a stake in the property. In 2011, when Invesco and National Pension bought their interest in the building, it was valued at $635 per square foot. [Crain's; previously]
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