Neither office conversion nor new construction is the universal cost winner. The right choice depends on a building’s floor plate, windows, structure, core, condition, acquisition price, vacancy and lease obligations, local rents, financing, code requirements and approval timetable. A conversion can reuse a sound structure and shorten the path to housing, but deep floor plates, curtain-wall façades, new plumbing and life-safety work can erase that advantage. New construction offers a clean layout and predictable residential systems, yet it carries demolition or land costs, a longer schedule and higher upfront capital in many markets.
The most reliable comparison is a building-specific pro forma that tests conversion, new construction and continued office use on the same assumptions. The figures below come from separate studies with different building types, products and methods; they are benchmarks, not guaranteed bids.
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What the two options actually mean
An office-to-apartment conversion retains all or most of an existing building’s structure and envelope, then adds the systems and layouts required for residential occupancy. The scope may include selective demolition, new risers and branch plumbing, kitchens and bathrooms, ventilation, acoustic upgrades, fire protection, windows, façade repairs, elevators, electrical capacity, insulation and accessibility work. Acquisition, tenant relocation or lease termination, design, permits, financing and carrying costs are part of the investment even when they are not visible in a construction estimate.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallNew construction starts with a cleared or vacant site and designs the structure, envelope, core, mechanical systems and apartment plan as one coordinated residential project. It avoids many conversion surprises, but the budget includes land or demolition, site work, foundations, a complete structure and a longer period before rent or sales revenue begins. A fair comparison must use the same location, unit mix, quality level, affordability requirements, financing assumptions, tax treatment and stabilization date.
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What the available cost evidence shows
Published studies do not provide a national, apples-to-apples price for converting an office into apartments versus building the same apartments new. The studies answer different questions, so their numbers must remain qualified.
| Evidence | Scope and assumptions | Reported result |
|---|---|---|
| Brookings Institution, 2025 guide | Three candidate buildings in each of six downtown markets (18 total); market data from Q3 2024; conversion estimates from Turner Construction; model includes acquisition, lease termination or vacancy, hard and soft costs and financing. | Sixteen of 18 buildings had negative net present value (NPV) after modeled conversion costs. Average hard conversion costs exceeded $300 per square foot in every profiled city except Houston. In five of six markets, no modeled conversion was economically viable without policy intervention. |
| Railway Exchange Building, St. Louis | Fully vacant building; Brookings assumes the city supplies the building and land to a developer at no cost. Figure includes hard and soft conversion costs. | Estimated conversion cost up to $400 million. Modeled return on cost was 2.71%, compared with an 8.3% threshold assumption for accepting conversion risk. |
| Developer interviews cited by Brookings | Lowest cost for a recent conversion encountered in interviews; cost measure differs from the Railway Exchange estimate and is not a national average. | $145 per square foot. Brookings cautions that a limited specialist labor pool may contribute to high conversion costs. |
| Pew Charitable Trusts/Gensler, reported March 24, 2026 | Modeled furnished co-living microapartments in ten U.S. cities; includes acquisition, design, construction, furnishing and seismic retrofit where needed. | $123,300 to $238,700 per unit. The modeled product cost one-third to one-half as much as new traditional studio development in all but Houston. Houston’s comparison describes a typical high-cost-city new studio as often costing about $400,000. |
| Pew/Gensler layout comparison | Co-living concept compared with conventional office-to-residential apartment conversion. | Estimated construction cost per square foot 25% to 35% lower, primarily because shared plumbing remains near the existing core. |
The Brookings figures are modeled investment outputs, not contractor bids. The Pew figures describe a specific furnished co-living product rather than self-contained apartments. A lower per-unit cost in that concept cannot be applied to a conventional one-bedroom conversion without redesigning the program and tenancy model.
Why conversion economics vary so widely
Building geometry and the residential yield
Apartment value comes from usable, rentable area with adequate daylight, ventilation, privacy and circulation. Office buildings were usually optimized for desks, meeting rooms and large open spans. A deep floor plate may leave a large area too far from an exterior wall for a compliant bedroom or living room. More corridor, shafts and internal common space then reduce the percentage of gross area that earns rent.
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The New York City Department of City Planning’s January 2023 NYC Office Adaptive Reuse Study found that early-twentieth-century offices with shallow floor plates and individual operable windows are generally the easiest and most attractive to convert because they require less physical alteration and allow relatively efficient apartment layouts. Post-1960s offices more often have deep plates and glass curtain walls. In the context of that study, residential buildings require operable windows; satisfying that requirement in a deep, sealed office can involve extensive façade work or make parts of the floor plate unusable. Requirements differ elsewhere and must be checked with the local building department.
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Core, structure and existing systems
Residential projects need more bathrooms and kitchens per floor than most offices, plus domestic hot water, exhaust, trash handling, acoustic separation and often larger electrical and fire-protection capacity. If the existing core is compact and well located, new risers can serve both sides of a floor. If bathrooms must be scattered across a large plate, horizontal piping, slab penetrations and ceiling drops add cost and reduce ceiling height.
Investigate floor-to-floor height, column spacing, transfer structures, slab capacity, elevator quantity, stair separation, fire-resistance ratings, roof loading, hazardous materials, façade anchors and water and sewer capacity before relying on a conceptual unit count. Deferred maintenance and an occupied building’s unknown conditions can turn a low acquisition price into a high total cost.
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A vacant office may permit a faster, safer construction sequence, but vacancy can also signal weak demand, obsolete systems or a difficult location. In an occupied building, lease buyouts, relocation, noise controls and phased work can be substantial. Every month before occupancy adds interest, insurance, taxes, security and lost rent. Brookings’ conversion model explicitly includes acquisition, lease termination, design, permitting, legal and financing costs when comparing residential conversion with continued office use.
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Layout choices: conventional apartments or a different product
Conventional self-contained apartments
Studios and one- to three-bedroom apartments require private kitchens and bathrooms, exterior windows for habitable rooms where local rules demand them, and acoustic and fire separation between units. Shallow plates can produce efficient double-loaded corridors or perimeter units. Deep plates may force narrow units, long corridors, interior rooms without acceptable daylight, or a large loss of area to circulation and shafts.
New construction can place the core, risers, windows and structural grid around the apartment plan from the beginning. Conversion designers must work around what is already there. The result can be excellent, but it may have an unusual unit mix, fewer units per floor or expensive interventions that a new building would avoid.
Courtyards and other geometric interventions
New York City’s 180 Water Street demonstrates one way to make a large plate workable: carve an internal courtyard to bring daylight and air deeper into the building. The trade-off is lost floor area, structural and façade work, waterproofing, and a more complicated construction sequence. A courtyard is a project-specific solution, not evidence that every deep plate can be converted economically.
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The Pew/Gensler concept, based on analysis conducted in 2025 and reported by Pew on March 24, 2026, responds to difficult plates by placing private furnished rooms around the perimeter and shared bathrooms, kitchens and laundry near the core, where office plumbing already exists. Smaller private rooms and shared facilities reduce plumbing extensions and make core-adjacent space useful.
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This is not a conventional apartment conversion. Residents exchange private kitchens and bathrooms for shared amenities, and the operator must manage furnishing, cleaning, leases, insurance, security and community rules. Pew describes the model as unproven, with financing and insurance challenges; its projected construction and subsidy efficiencies are not observed long-run operating results.
Comparing conversion with new construction on the right measures
| Decision dimension | Office conversion questions | New-construction questions |
|---|---|---|
| Building fit | Are floor plates shallow enough? Are windows operable or replaceable? Can the core, shafts, stairs and structure support residential use? | Can the site, zoning envelope and geotechnical conditions support the planned massing and core? |
| Housing yield and quality | How many legal, daylit units remain after corridors, shafts, courtyards and common areas? What unit mix can the plate support? | Can the structure and façade be optimized for the target unit mix, daylight, ventilation and privacy? |
| All-in cost | Include acquisition, lease termination, selective demolition, façade and window work, plumbing and mechanical changes, code upgrades, design, permits, financing, contingency and furnishing where applicable. | Include land or acquisition, demolition, site work, foundations, complete structure and envelope, utilities, design, permits, financing, contingency and furnishing. |
| Value and timing | Test rent or sales proceeds, vacancy, operating expenses, taxes, financing and time to occupancy against continued office use. | Use the same assumptions, while allowing for a generally longer construction and entitlement period. |
| Regulation and public support | Verify zoning, change-of-occupancy rules, fire and accessibility codes, parking, minimum unit size, window and ventilation rules, tax credits and subsidies. | Verify the same items plus site-specific density, height, setbacks, environmental and utility approvals. |
| Resident and delivery model | Choose conventional apartments, furnished co-living or another clearly defined product; assess tenant-in-place risk and the team’s adaptive-reuse experience. | Define the target renter or buyer, construction method, delivery risk and market absorption for a new product. |
How the major studies differ
Brookings: detailed building-level feasibility
Brookings modeled three buildings in each of six downtown markets. Its sample shows why a favorable rent market does not make every building investable: 16 of 18 buildings had negative NPV after modeled conversion costs, and average hard conversion costs exceeded $300 per square foot in every market except Houston. The report concludes that in five of six markets no modeled conversion was economically viable without public policy intervention. Those results reflect Q3 2024 market data, selected buildings and stated assumptions; they are not a national conversion rate.
NAR: a market-level screen
The National Association of REALTORS’ analysis identified 22 of 27 metros where rent comparisons made office-to-housing conversion appear feasible. It estimated 43,500 potential units if 20% of vacant office square footage were converted, assuming 1,000 square feet per unit and 20% common area. That arithmetic screen does not test an individual building’s windows, structure, code path, financing or contractor pricing. NAR’s review of eight completed conversions highlights local developer experience, a clear target market and purpose, engineering complexity and community buy-in as practical success factors.
New York City: observed adaptive reuse
New York City reports that approximately seven million square feet became about 4,300 residential units from 2010 through 2020 without government subsidy or other financial support. The city’s study describes which building characteristics tend to support efficient layouts; the total does not establish a cost or success rate for every office type or another jurisdiction.
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Pew/Gensler: a modeled affordability concept
Pew estimates that $25,000 to $120,000 of upfront subsidy per co-living microapartment would be needed to attract private developers, while its model assumes no ongoing operating subsidy after conversion. Across ten cities, it estimates 3.9 times as many affordable homes per dollar of subsidy as studio apartments. Those are modeled results for the proposed product, not proof that private developers have achieved that efficiency at scale.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.A step-by-step way to evaluate a candidate building
- Define the baseline. Record the building’s address, ownership and acquisition terms, current occupancy, lease expirations, gross and rentable area, asking or contracted price, taxes, insurance and the value of continued office use.
- Survey geometry and condition. Measure floor-plate depth and shape, window spacing and operation, façade condition, column grid, slab and floor-to-floor heights, core location, stairs, elevators, roof, structure, hazardous materials and utility capacity.
- Test a residential yield. Lay out at least two unit mixes. Mark every exterior wall, required window, corridor, shaft, stair, refuse room, amenity and service space. Calculate net rentable or sellable area, not just a gross unit count.
- Choose the product deliberately. Compare self-contained apartments with a co-living or furnished model only if local tenancy, licensing, management, insurance and resident demand support it. Do not use co-living cost benchmarks for a conventional apartment budget.
- Confirm the code path. Ask the authority having jurisdiction about zoning, change of occupancy, fire separation, egress, accessibility, sprinklers, acoustics, ventilation, window requirements, minimum unit size, parking and approval by right or discretionary review.
- Price the complete scope. Obtain a current design-based estimate that separates acquisition, relocation or lease termination, demolition, structure, façade and windows, plumbing, HVAC, electrical, fire protection, elevators, finishes, furnishings, professional fees, permits, financing, insurance, contingency and escalation.
- Model time and cash flow. Compare conversion, new construction and continued office use with the same rent or sale assumptions, vacancy, operating expenses, taxes, financing rate, draw schedule, stabilization period and exit value. Use NPV for paths with different timing and show sensitivity to cost, rent, vacancy and interest rates.
- Test incentives and funding. Identify tax abatements, grants, affordable-housing programs, parking waivers, code alternatives and expedited approvals that actually apply. Treat a proposed incentive as uncertain until its legal and funding conditions are documented.
- Make a go/no-go decision. Proceed only when the design meets code, the target residents are clear, the all-in budget has contingency, the schedule is financeable and the return compensates for conversion risk relative to new construction and continued office use.
Policy and approval factors that can change the result
Conversion feasibility is partly a policy question. Brookings and Pew identify zoning and code changes, incentives and streamlined approvals as potential ways to close the gap between residential value and conversion cost. The effect depends on the jurisdiction and project.
Pew describes Houston’s Central Business District parking waiver and Denver’s Adaptive Reuse Pilot Program for application support as current examples. Other reforms discussed include reducing or removing minimum unit-size and parking requirements, allowing mechanical ventilation where operable windows are infeasible, removing unit caps and permitting qualifying conversions by right. These examples are not universal rules; confirm the current ordinance, eligibility and expiration date before underwriting them.
Public support can improve feasibility but does not fix an unsuitable floor plate or weak housing demand. Conversely, a favorable code path cannot compensate for acquisition, financing or construction costs that exceed the value of the completed homes.
Common mistakes and how to avoid them
- Using a national conversion price. Replace it with a building-specific estimate that states geography, date, unit type, cost scope and assumptions.
- Comparing unlike products. A furnished co-living room with shared facilities is not equivalent to a new, self-contained studio.
- Counting gross area as apartments. Deduct corridors, shafts, stairs, elevators, amenity space, service rooms and any courtyard or light well.
- Ignoring the existing occupancy. Add lease termination, relocation, phased work, security and lost rent when tenants remain.
- Assuming reuse eliminates code work. Residential fire, egress, accessibility, acoustic, ventilation and energy requirements can require extensive alterations.
- Treating a market screen as a feasibility study. NAR’s 22-of-27-metro result and its 43,500-unit estimate do not establish that a particular building will finance.
- Relying on modeled savings as operating history. Pew’s co-living concept has no established long-run operating record in the reviewed evidence and faces financing and insurance challenges.
- Leaving the office option out of the model. Compare the residential path with the value and cost of continued office use, including vacancy and future capital needs.
When each path is more defensible
Conversion is more promising when
- The building has a shallow, regular plate, frequent usable windows, adequate ceiling height and a core that can serve new bathrooms and kitchens.
- It is vacant or leases can be ended at a known cost and date.
- Acquisition reflects the building’s actual condition rather than an office-era valuation.
- Local rents, incentives or affordable-housing funding cover the conversion scope and financing carry.
- The team has delivered adaptive reuse and has a clear resident, unit-mix and management plan.
New construction is more defensible when
- The office plate is deep, the façade cannot provide compliant windows, or major structural and envelope work would consume the proposed savings.
- Demand calls for a unit mix or amenity package that the existing grid cannot accommodate efficiently.
- The site supports a materially higher residential density than the existing building, making a new structure’s yield worth the longer schedule.
- Existing conditions, hazardous materials, tenant obligations or uncertain utilities make conversion risk impossible to price.
- A clean residential design, predictable systems and long-term operating efficiency outweigh the value of retaining the existing frame.
Bottom line for owners, developers and communities
Office-to-apartment conversion is a design-and-finance problem, not a simple discount on new construction. The strongest candidates combine residential-friendly geometry with a realistic acquisition price, manageable occupancy, a code pathway and local demand. New construction earns its premium when the existing envelope, core or floor plate prevents an efficient, compliant product.
Use the published statistics as context: Brookings found 16 of 18 modeled buildings had negative NPV and more than $300 per square foot in average hard conversion costs in every studied city except Houston; NAR found market-level potential in 22 of 27 metros; New York documented 4,300 units from seven million square feet over 2010–2020; and Pew/Gensler modeled $123,300–$238,700 co-living units with 25%–35% lower construction cost per square foot than conventional conversions. None replaces a current, project-specific comparison of conversion, new construction and continued office use.
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