$420M CMBS Loan Backed by 51 West 52nd Exits Special Servicing, Secures Extension
The 893,000-square-foot office building traded for $760 million in October 2021
By Brian Pascus September 15, 2026 6:55 pm
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A $420 million commercial mortgage-backed securities (CMBS) loan secured by 51 West 52nd Street — a 38-story tower with 893,000 square feet of office space in Midtown — will exit special servicing after sponsor Harbor Group International closed a loan extension.
The $420 million CMBS loan — which makes up DBGS 2021-W52 single-asset, single-borrower deal — was sent to special servicing ahead of its October 2026 maturity, even though it still has a 12-month extension option, according to an alert from Morningstar Credit Analytics.
A source close to the deal told Commercial Observer that the transfer of 51 West 52nd Street to special servicing was merely “a temporary, technical step” required to execute an already negotiated upsize and extension with the existing lender, Deutsche Bank.
The terms of the extension were not disclosed. No broker was involved in the transaction.
Real estate investment and management firm Harbor Group International bought the office tower from ViacomCBS — which called the building its headquarters for decades and retained 11 floors of office space after the deal — in October 2021 for $760 million. It was the largest investment sale that traded hands that year.
CO reported at the time that Harbor Group secured $558 million in CMBS financing on the deal. Deutsche Bank led the six-year, floating-rate transaction, aided by Goldman Sachs and Brookfield Real Estate. The deal was structured with a $420 million senior mortgage debt from Deutsche Bank and Goldman, and Brookfield contributed a $138 million mezzanine position.
Since the 2021 origination, the net cash flow at 51 West 52nd Street has “significantly underperformed throughout the loan term,” according to Morningstar, with occupancy dropping from 99 percent to 86 percent, and cash flow falling 37 percent below its underwritten levels in June 2026.
A source close to the deal disputed this and told CO that the building “is now fully leased, with an over 13-year weighted average unexpired lease term.”
The building has secured significant leases in recent years.
CO reported earlier this summer that Alston & Bird, which provides legal counsel to Fortune 100 companies and private institutions, signed a 15-year, 169,664-square-foot lease at 51 West 52nd Street.
Other recent deals CO covered include Kroll Bond Rating Agency taking 121,000 square feet in January and law firm Orrick, Herrington & Sutcliffe renewing its 144,312-square-foot space in July 2024.
Originally built as the headquarters for CBS broadcasting, 51 West 52nd Street opened in 1965 and was known for years as the CBS Building or Black Rock, due to its dark, minimalist design.
Since acquiring the building in 2021, Harbor Group International has invested $150 million into renovation and tenant improvements.
Harbor Group International did not respond to requests for comment.
Brian Pascus can be reached at bpascus@commercialobserver.com.
