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90,000 Office-to-Residential Units Are in the Pipeline. Most Will Not Pencil.

CREagentic TeamMay 27, 20266 min read

The pipeline

Adaptive reuse projects in the United States now include 90,300 apartment units planned in former office buildings, a 28% increase over last year. Office conversions make up 47% of all adaptive reuse projects. New York, Washington and Chicago have the most units in progress. Philadelphia, Denver and St. Louis more than doubled their pipelines. Cities want the housing, they want the tax base back, and several have passed incentives to make it happen.

Planned units and delivered units are different things. A large share of these projects will stall at the financing stage, because the building itself makes the numbers impossible. Here is the screen that sorts them.

The physical test comes before the financial one

Floor plate depth. An apartment needs a window. A floor plate deeper than about 45 feet from the window line to the core leaves a dark middle that becomes corridor, storage or wasted rentable area. Post-1970 office towers with 100-foot-deep plates convert at 55% to 65% efficiency, which means a third of the building earns nothing. Pre-war buildings with narrow plates convert at 75% to 85%. That gap alone decides most projects.

Window openings. Curtain wall with fixed glazing has to be replaced with operable windows in most jurisdictions. That is a facade project on top of a gut renovation. Punched windows in a masonry facade are already there.

Plumbing risers and structure. Office has one wet core. Apartments need plumbing every 25 feet. Every new riser is a slab penetration, and some slabs cannot take them. Get a structural engineer in before the architect.

Ceiling height and elevators. Nine-foot slab-to-slab with ductwork leaves a seven-and-a-half-foot ceiling once you drop the mechanicals. That is a basement apartment at a Class A rent. Elevator counts sized for office peak loads are usually fine, but a building with one bank serving 40 floors will fail the residential fire code.

Then the money

A building that passes the physical screen still has to be bought cheaply. The conversions that work are buying office at $100 to $200 per square foot, spending $250 to $400 per square foot on the conversion, and delivering apartments into a market where new construction costs $500 to $700 per square foot all-in. If the seller wants $300 per foot for a half-empty tower because "it's a conversion play," the play is his, not yours.

Incentives change the math but rarely rescue it. A 20-year tax abatement adds maybe $40 to $60 per square foot of value. It does not fix a 100-foot floor plate.

What the pipeline number means for office owners who are not converting

Every conversion removes office inventory. In Washington and New York the removals are already visible in the vacancy figures. If you own a Class B building in a city with an active conversion program, your competition is shrinking, and the tenants leaving the buildings under conversion have to go somewhere. That is the most underappreciated upside in the office market right now. It accrues to the owners who stay, kept their buildings in decent shape, and can sign a lease this year.

The documents decide the deal, and there are hundreds of them

A conversion candidate comes with a lease file that has to be emptied before construction can start. Every remaining tenant has a termination right or a relocation clause or a holdover provision that determines how fast the building can be cleared and at what cost. It also comes with a title file full of easements, reciprocal agreements and use restrictions that decide whether residential is even allowed without a variance.

Reading all of that by hand is a month of associate time on a mid-size building, and the item that kills the deal is usually on page 60 of a 1998 amendment. Document extraction tools read the whole file in a day and surface the termination rights, the relocation clauses and the restrictive covenants as a list with page references. That lets the buyer put a cost and a timeline on the tenant buyouts before the offer instead of after the deposit goes hard. On a conversion where the buyout budget can swing by $5 million, that is the most valuable hour of software the project will ever use.

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