A German lender says a landmark downtown Seattle office tower has literally been left out in the rain, accusing Blackstone’s property arm of letting the 23-story Exchange Building fall into disrepair as water crept in and maintenance slipped.
In a lawsuit, DekaBank claims years of persistent water intrusions and deferred facade work have left the historic high-rise needing big-dollar fixes. A consultant hired by the lender pegged short-term repairs at about $17.2 million, with another $13.1 million for longer-term reserves. On-site staff allegedly reported active leaks on several floors, and the complaint says the problems have been around since at least 2018.
DekaBank filed the complaint last week, alleging that Blackstone Property Partners failed to live up to a carry guarantee tied to a 2022 refinancing and let the building’s exterior envelope deteriorate. Blackstone has fired back that the claims are “without merit.”
“We have been responsibly managing this asset since our acquisition in 2017,” a Blackstone spokesperson said in a statement to reporters, according to The Real Deal.
What the lawsuit says happened
According to the complaint, DekaBank originally made a $97.1 million loan on the Exchange Building in 2017, then refinanced the debt with Blackstone in 2022. As part of that refinancing, the lender says, Blackstone agreed to a carry guarantee that would stay in place until 18 specific conditions were met.
DekaBank alleges Blackstone left two of those boxes unchecked, which meant the carry guarantee remained in force while the lender brought in a consultant to examine the site, structure, facade and windows. That consultant’s report, cited in the suit, estimates about $17.2 million in immediate repair needs plus $13.1 million in reserves for additional work. The report also notes active leaks on multiple floors. The property’s manager, an affiliate of Equity Office, reportedly confirmed that leakage issues date back to 2018, as outlined by The Real Deal.
How a carry guarantee fits into the fight
In commercial real estate finance, a carry guarantee is the part of the deal that can keep an owner on the hook for operating shortfalls. It typically covers things like debt service, property taxes and routine operating and maintenance costs until certain loan conditions are satisfied.
That setup can get tense fast when “routine” upkeep starts to look like a massive capital repair project. Legal advisers note that carry guarantees are common in loan restructurings and often sit at the center of disputes over who must pay for big-ticket fixes. For a deeper legal explainer on how those guarantees work, see this primer from Olshan Frome Wolosky.
Why those leaks are so expensive
Water that sneaks in through bad seals, flashing or window perimeters rarely stays a small problem. Building-envelope specialists say minor leaks often hide broader facade failures, which means putting off repairs can turn a modest maintenance job into a much larger structural and indoor-air project.
That is the dynamic DekaBank’s consultant flagged in estimating both immediate repairs and a hefty reserve for follow-up work. For more on how facade waterproofing and moisture control can go wrong, industry guidance from Facade Today walks through the technical pitfalls.
What comes next in the Seattle tower showdown
The lawsuit asks the court to enforce DekaBank’s rights under the carry guarantee and to hold Blackstone responsible for the repair and reserve costs the lender attributes to deferred maintenance on the building’s exterior. Cases like this often end in a negotiated settlement, with agreed-upon repairs and money set aside in escrow, although they can also grind on in litigation over contract language, cure rights and who ultimately pays to restore a troubled facade.
For tenants, investors and downtown Seattle stakeholders, the case is a reminder that maintenance decisions can quietly snowball into multimillion-dollar courtroom battles.
Blackstone has said it will respond in the ordinary course as the litigation moves forward. DekaBank is pressing its claims in New York Supreme Court, and the dispute could spur closer scrutiny of other office towers where delayed upkeep may be raising both safety concerns and valuation questions.
