Walk a half-empty downtown office plate and you can feel why owners keep asking about apartments. National office vacancy has been hovering near record highs—around 19% in CBRE’s mid-2025 read—while multifamily still pencils differently in a lot of those same markets. CBRE tracked 23.3 million square feet of office space slated for demolition or conversion across 58 major markets in 2025, against 12.7 million square feet of new office completions. Conversions alone were expected to hit about 12.8 million square feet. The pipeline beyond that year held roughly 81 million square feet of office marked for other uses. Seventy-six percent of active conversion projects were planned as multifamily. Since 2016, office-to-multifamily conversions have already delivered about 33,000 units, with another 43,500 in the pipeline if planned projects proceed. (CBRE, June 2025.)
Those figures explain the interest. They do not finish the job. A conversion still has to deal with tight freight elevators, odd bay spacing, neighbors who still go to work next door, and a labor market that does not expand because the use group changed. That is where prefabricated cold-formed steel stops being a brochure topic and starts being a logistics plan.
Wall-tech has spent 40+ years on CFS systems—design, prefabrication, install—mostly on new mid-rise. The same shop discipline shows up on conversion packages when the structure stays and the interiors and perimeter have to move fast. Details are on Services.
On a live conversion, the constraints stack differently than on a clean pad. Crane swings are shorter. Laydown is a loading dock, not a yard. You cannot fill the floor with cut stations when tenants or adjacent offices are still operating. Prefabricated CFS panels arrive sequenced, labeled, and mostly ready to set. The field crew spends its day on connections, openings, and coordination with MEP—not on building walls from sticks in a corridor that still smells like printer toner.
Infill partitions and perimeter framing are the two scopes where this shows up first. Infill wants repeatable unit demising and corridor rhythm; panels make that rhythm a shop product. Perimeter wants enclosure so the interior trades can start without waiting on weather. Neither scope forgives a fabricator who cannot hit a delivery window. Conversion GCs hire for the window as much as for the wall.
Noise and neighbor management are underrated conversion costs. A stick operation on an occupied floor means saws, cut stations, and material staging in corridors that may share an elevator with people trying to work. Panel setting concentrates the noisy work into crane windows and connection periods. That does not make conversions quiet. It makes them more predictable for the property manager who still has tenants on other floors.
Existing structural grids also punish improvisation. Office bay spacing rarely matches apartment demising. Prefab CFS cannot invent a column that is not there, but it can absorb repeating infill once the unit module is decided—so the field is not reinventing every partition length by hand while the drywall crew waits.
Speed from panelization is easiest to see on enclosure work we have already finished. On the Milwaukee Ballet Baumgartner Center for Dance—about 55,000 square feet of bypass CFS—a 40-day enclosure schedule finished in seven days. Prefabrication ran during foundations. Wood blocking and temporary window enclosures rode in the panels. Pre-installed blocking and fast panel setting each contributed about three weeks; together the team shaved six weeks off the schedule. Lead foreman Bernie Olson put it plainly: stick-building the enclosure would have burned the GC’s entire 40-day allotment. Panelizing finished the skin in a week.
A conversion is not a ballet center. The lesson still travels. Shop work that runs while demolition, abatement, or podium prep is underway is the only way most downtown jobs pick up calendar. If your conversion plan assumes enclosure starts the day the deck is clear and every stud is cut on site, you have already given back the weeks CBRE’s pipeline assumes someone will find.
The Ballet panels also carried temporary window enclosures. On a conversion, that same idea—weather the floor fast so interiors can start—often decides whether the MEP rough-in stays on the schedule you sold the lender. Empty office glass does not equal a weathered residential floor. Until the new perimeter and openings are secure, you do not have an apartment building. You have a drafty shell with a new use group on paper.
For taller urban CFS on our projects page, Atmosphere Apartments in Madison is listed at about 460,000 square feet and 12 stories of floor-to-floor prefab exterior CFS wall framing. East College Street Apartments in Iowa City is listed at about 140,000 square feet and 13 stories of load-bearing CFS. Those are new builds, not conversions. They matter here because they prove the shop can hit repeating floor plates, labeled sequences, and tight urban pads—the same muscles a conversion needs when the plate is irregular and the freight elevator is the bottleneck.
Adaptive reuse also forces honest scope splitting. Some walls stay stick because the existing condition will not tolerate a panel. Some shafts and rated assemblies want site-built attention. Prefab CFS is not an all-or-nothing religion. It is a way to pull the repetitive demising and perimeter work off the critical path so the oddball conditions get the field time they deserve.
CBRE’s pipeline math only helps if someone can actually build the units. Seventy-six percent of active conversions aimed at multifamily is a demand signal, not a delivery guarantee. The teams that will clear that pipeline are the ones who treat enclosure and demising as industrial work, not as a field craft experiment on every floor. That is the overlap between new mid-rise CFS and adaptive reuse. Same shop. Different existing conditions. CBRE June 2025 release.
If the deal is a 4–12 story new mid-rise instead of a conversion, we have written separately about how CFS compares with wood on those heights in Cold-Formed Steel vs. Wood Framing for 4–12 Story Buildings: Cost, Schedule, Fire, and Insurance. For how developers weigh wood against CFS when insurance and story count enter the room, see Why Multifamily Developers Are Looking Harder at Cold-Formed Steel. Cost and carrying-cost math live in Cold Formed Steel (CFS) Framing: A Cost-Saving Solution for Construction Projects. Prefab crew realities are in What a Prefab CFS Crew Actually Changes on the Deck. Longer-horizon industry pressure is in Prefab CFS on Mid-Rise Multifamily: Labor, Codes, and Carrying Costs.
Have a conversion candidate on the books? Walk us through the floor plates, the structural keep/replace notes, and the unit mix you are chasing. We will mark what belongs in the shop, what stays stick, and whether CFS infill or perimeter panels belong in the bid package. Contact is the shortest route.
• CBRE, Office Conversions and Demolitions Will Exceed New Construction in 2025… (June 9, 2025): https://www.cbre.com/press-releases/office-conversions-demolitions-exceed-new-construction-2025-first-time-several-years-aiding-office
• Wall-tech / Milwaukee Ballet Baumgartner Center project profile: https://www.walltechinc.com/hubfs/Project%20Profiles%20Case%20Studies/Milwaukee%20Ballet.pdf