NEW YORK CITY-Two months after an agreement was reached between Macklowe Properties and SL Green Realty Corp. to halt a foreclosure on Macklowe’s 510 Madison Ave., the boutique office tower has been sold to Boston Properties. The $280.5-million purchase price equals the aggregate principal and accrued interest on the property’s existing senior mortgage loan and senior mezzanine loan, the Boston-based REIT said in a statement late Friday afternoon.

Earlier this month, Boston Properties bought the $69-million junior mezzanine loan on the property for about $22.5 million from a third party, which the New York Post identified as a group affiliated with O’Connor Capital Partners. Following closing of the Macklowe deal, Boston Properties will be sole owner of 510 Madison.

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