Underscoring the challenges facing commercial real estate credit nationwide, the owners of a New York office tower had to put another $150 million of equity into the property to refinance their $625 million mortgage.

SL Green Realty Corp. said Tuesday that it and SITQ, the joint owners of 1515 Broadway, obtained the new $475 million mortgage from a syndicate led by Bank of China, based in Beijing. The original loan was scheduled to mature in November; the new one has a five-year term.

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