The easiest office conversion never had a tenant to move

Two construction loans out of Northwind Group — $219 million for 100 Wall Street in Lower Manhattan and $208 million for 141 Willoughby Street in Downtown Brooklyn — will add 407 rental apartments across the two buildings while commercial space stays commercial in each. Read together, they are the fullest test yet of a structure the market has discussed far more often than it has financed: the partial conversion, in which one half of an office building changes use and the other half keeps leasing.

Ran Eliasaf, Northwind's founder and managing partner, told Connect CRE that partial conversions are becoming an increasingly relevant option for properties where part of the building still works as office and other floors suit residential use. His case is about cash flow rather than design: a partial conversion lets an owner preserve the value and cash flow of the strongest office component while creating residential value in the portions where the economics support conversion. The office income, far from a leftover to be demolished when the leases roll, is part of what makes the loan underwritable.

At 100 Wall Street the structure is already working: floors 2 through 11 become 168 apartments while floors 15 through 29 stay office and are nearly fully leased, a paying tenant roster in the same building as a construction site. Eliasaf's description of the trade is plain — existing office tenancy and cash flow support the property through the conversion, and the residential floors become an additional source of value when they are done, so the asset never stops producing while it is rebuilt.

141 Willoughby makes the case from the other end: the 24-story, 355,000-square-foot Class A building was completed in 2023 and never occupied, and floors 8 through 23 will become 239 apartments while floors 1 through 7 remain commercial. The physical argument is strong — nearly column-free floor plates, floor-to-ceiling glazing, slab-to-slab heights of 15 to 17 feet — but the operative fact is the empty roster. As Eliasaf noted, a building that never had tenants avoids many of the relocation and lease-termination issues that come with converting occupied office space.

Those relocation and lease-termination problems are the part of conversion underwriting that schedules handle badly, and the part a vacant building simply does not have. The least encumbered conversion candidate is a building that never had a tenant to move. That points the near-term pipeline toward recent-vintage Class A towers that delivered into a demand reset rather than the older stock the phrase office conversion usually conjures, though two loans from one lender do not prove a shift, and the coverage does not say where else this paper is being written.

Across the pair, the arithmetic sets the stakes. The Brooklyn loan carries 42 percent more apartments on 5 percent less debt than the Manhattan one, which works out to roughly $870,000 of debt per unit against $1.3 million. Different buildings with different commercial components left in place make that gap a poor construction-cost comparison, but it still sizes the bet: at 100 Wall, much of the residential outcome rides on a leased office block, while in Brooklyn much of it rests on cost avoided rather than income collected during construction. Both are construction loans rather than refinancings of stabilized assets, which means the capital goes in before the apartments exist and the office half has to behave for the whole build.

Connect CRE frames the open question as whether lenders will finance partial conversions at all, and Northwind's $427 million is a yes from one firm's book. It lands in a market that has already chosen capital expenditure over price discovery: CRE owners are spending rather than selling — nearly 80 percent of Deloitte's respondents planned repositioning and 46 percent expected no sales — and a partial conversion is the most capital-hungry version of that choice, because the money goes into structure rather than into rent concessions. It also defers the office mark, since no sale forces a price onto the half of the building that keeps leasing.

That sits inside the argument about the refinancing wall, where the clearing basis is set in the debt stack rather than at closing tables. Partial conversion is the variant of that trade in which nothing clears at all: the owner does not transact the office, and the lender takes construction and lease-up risk instead, on terms that have to hold for years. Our September reporting put the median policy rate at 4.1 percent through 2027, which means conversion debt has to work across a plateau rather than into a cut. The office asset still needs a trade. Here the trade is a loan.

The structure deserves to be taken seriously, and the conversion pipeline figures that will follow these two deals deserve skepticism for the same reason. Partial conversion closes when the office half throws off enough income to carry the build, or when vacancy removes enough cost to make the math work without it. Buildings that fail both tests — occupied but under-leased, and too old to convert cheaply — are left holding the sale they do not want to make.

Northwind has now put $427 million behind a single reading of the structure: keep the half that pays and rebuild the half that will reprice. The next test is a conversion loan on a building whose tenants have to move first.