Lone Star Funds Buys Nonperforming Loan on 600 California Street, a Distressed San Francisco Office Tower
A debt purchase that can reshape control of a Financial District asset
Lone Star Funds has acquired the mortgage secured by 600 California Street, a roughly 360,000-square-foot Class A office tower at the intersection of the Financial District and Jackson Square. The transaction positions the buyer to potentially assume control of the property through the remedies available to a loan holder if the debt remains in default.
The acquisition comes amid a multi-year downturn in San Francisco’s downtown office market, where falling values and higher vacancy have increased the number of loans trading at discounts and pushing more properties toward restructurings, workouts or foreclosure.
What is known about the loan and the building
Market reporting tied to the deal indicates the purchased debt was a nonperforming loan with a face amount of $240 million, acquired for close to $130 million. The building had previously been associated with WeWork ownership, and the reported loan sale price reflects a steep discount relative to the approximately $322.8 million paid for the property in 2019.
Lone Star described the tower as having large blocks of available space and floorplates that can accommodate tenants seeking immediate occupancy. The firm also said the building has received capital improvements in recent years, including lobby updates, elevator modernization, and building-systems work.
Property: 600 California Street, San Francisco
Size: about 360,000 square feet
Debt described in market reporting: $240 million, nonperforming
Reported purchase price for the debt: close to $130 million
Why a loan sale matters more than a building sale
In a distressed cycle, a loan transfer can be as consequential as a deed transfer. The buyer of a troubled mortgage typically steps into the lender’s position, gaining leverage to negotiate a restructuring, pursue a discounted payoff, or initiate foreclosure if contractual and legal conditions are met. For investors, purchasing debt can provide a pathway to ownership at a basis below peak-era valuations, particularly when traditional refinancing is constrained.
The transaction highlights how capital is increasingly moving through note sales, rather than conventional property trades, as lenders seek to reduce exposure and investors target discounted entry points.
What to watch next
Key next steps will likely revolve around whether the borrower and loan holder reach a consensual resolution, or whether the process advances toward foreclosure. Leasing progress at the property—and broader tenant demand downtown—will shape the building’s recovery prospects and the feasibility of stabilizing cash flow. The deal also serves as a marker for pricing expectations on well-located San Francisco office assets where debt, rather than equity, is setting the market.