Office-to-Apartment Conversions: Can Empty Offices Become Housing?
Office-to-apartment conversions are becoming a much larger part of U.S. adaptive reuse, but vacancy alone does not make an office building a good housing candidate.
At the beginning of 2026, approximately 90,300 apartments were in the U.S. office-conversion pipeline, according to RentCafe/Yardi Matrix data summarized by the National Apartment Association. That was roughly 28% above the prior year's reported pipeline and nearly four times the approximately 23,000 units reported in 2022.
The opportunity is real. So are the constraints. Floor depth, windows, plumbing, HVAC, structural systems, acquisition price, financing, achievable rents, zoning, and construction costs can all determine whether a project works.
Can an empty office building realistically become apartments?
Yes, but only selectively. A viable office-to-apartment conversion generally needs four things to align: the building must physically work, the local housing market must support the finished units, the economics must justify the redevelopment cost, and the regulatory environment must allow the project to move forward.
What does the 2026 office-conversion market look like?
The Bottom Line: Conversion activity is growing quickly, but pipeline numbers should not be confused with completed housing. Feasibility research also shows that many buildings that can technically be converted still struggle to work financially.
| Variable | Current Reference Point | Source / Date |
|---|---|---|
| U.S. office-to-apartment pipeline | ~90,300 units | RentCafe/Yardi Matrix via National Apartment Association, 2026 |
| Year-over-year pipeline growth | ~28% | National Apartment Association, April 2026 |
| Office share of adaptive-reuse apartment conversions | ~47% | National Apartment Association, April 2026 |
| Reported 2022 office-conversion pipeline | ~23,000 units | RentCafe / Yardi Matrix |
| Office space slated for conversion or demolition in 2025 | 23.3 million sq. ft. | CBRE, June 2025 |
| New office space projected for delivery | 12.7 million sq. ft. | CBRE, June 2025 |
| Realtor.com estimated U.S. housing supply gap | 4.03 million homes | Realtor.com, March 2026 using 2025 data |
| Brookings conversion-feasibility sample | 18 buildings across 6 downtowns | Brookings, July 2025 |
| Sample buildings with negative modeled NPV | 16 of 18 | Brookings, July 2025 |
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These figures point in two directions at once. More owners and developers are evaluating adaptive reuse, while the economic evidence shows why project announcements substantially outnumber easy conversion opportunities.
Data note: Pipeline figures include projects at different stages of planning and development. They should not be interpreted as apartments guaranteed to open during 2026.
What is an office-to-apartment conversion?
The Bottom Line: An office-to-apartment conversion changes an existing commercial property into residential housing while retaining some or much of the original structure. It is a form of adaptive reuse, not simply a cosmetic renovation.
The exterior of a converted office may remain recognizable, but the interior can require extensive reconstruction. Office buildings and apartment buildings distribute space and building systems very differently.
Depending on the property, redevelopment can require:
- New kitchens and bathrooms
- Plumbing risers and sanitary drainage
- Residential heating and cooling systems
- Electrical upgrades and new distribution
- Fire and life-safety improvements
- Residential corridors and unit separation
- Accessibility improvements
- New windows or façade modifications
- Elevator and stair modifications
- Acoustic separation and residential amenities
Why are office-to-apartment conversions accelerating?
The Bottom Line: Some older offices face persistent vacancy and weaker economics while housing can provide a more productive alternative use. Changing workplace demand, discounted commercial values, and public incentives are causing owners to reconsider what certain properties should become.
The office market is increasingly separating by quality. Newer, well-located and highly amenitized properties can continue to compete for tenants, while obsolete properties may face a harder path.
| Office Property | Potential Outlook | Conversion Relevance |
|---|---|---|
| Trophy / newer Class A | Stronger tenant demand | Often remains office space |
| Competitive Class A | Market-dependent | Repositioning may be preferable |
| Well-located Class B | Mixed performance | Conversion may warrant analysis |
| Obsolete Class B/C | Higher persistent-vacancy risk | Potentially stronger candidate |
| Historic downtown office | Building-specific | May offer adaptive-reuse potential |
| Isolated suburban office | Location-dependent | Residential demand may be weaker |
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How large is the office-to-apartment pipeline?
The Bottom Line: The reported national pipeline rose from roughly 23,000 office-to-apartment units in 2022 to approximately 90,300 at the beginning of 2026.
| Year | Reported Future Office-to-Apartment Units |
|---|---|
| 2022 | ~23,100 |
| 2023 | ~45,200 |
| 2024 | ~55,300 |
| 2025 | ~70,700 |
| 2026 | ~90,300 |
Swipe left or right to view the full table.
Does a 90,300-unit pipeline mean 90,300 apartments are opening?
The Bottom Line: No. Pipeline units can be in different stages of planning, financing, approval, construction, or redevelopment. Some projects will take years to complete, while others may change or never reach delivery.
- Financing problems
- Unexpected construction costs
- Entitlement or permitting delays
- Tenant-relocation issues
- Engineering problems
- Environmental conditions
- Residential rents that do not support the pro forma
- Changing interest rates or capital-market conditions
Investor interpretation: A pipeline measures potential. Completion and stabilization measure execution. Both should be reviewed.
Is excess office inventory actually leaving the market?
The Bottom Line: CBRE projected that conversions and demolitions would remove more office space from the 58 largest U.S. markets in 2025 than new office construction would add.
CBRE identified 12.8 million square feet slated for conversion and 10.5 million square feet slated for demolition, for 23.3 million square feet of combined removals.
New office deliveries were projected at 12.7 million square feet.
What are the four tests every conversion has to pass?
- Building: Can the structure efficiently become housing?
- Market: Will renters or buyers support the finished product?
- Economics: Does the stabilized value justify the total development cost?
- Policy: Can the project legally and financially move through approvals?
1. Does the building physically work?
The Bottom Line: Floor depth, windows, structural columns, elevator and stair locations, façade design, and existing building systems can determine whether apartments fit efficiently enough for a viable conversion.
Why does floor-plate depth matter?
Office buildings can place workspaces, conference rooms, storage, and circulation areas far from exterior windows. Apartments require a different relationship between living space, bedrooms, windows, ventilation, and circulation.
A deep office floor can leave a large interior zone that does not translate efficiently into conventional residential units.
Why would a developer remove part of a building?
Selective demolition can improve daylight and make the remaining floor area more usable for housing. The tradeoff is additional structural cost and lost square footage.
How does the structural grid matter?
Existing columns and cores were positioned for commercial layouts. A column inside a new wall may be easy to accommodate, while one in the middle of a bedroom or living space can reduce unit efficiency.
2. Can the building systems support residential use?
The Bottom Line: Plumbing, HVAC, electrical systems, elevators, fire protection, structural slabs, and the building envelope can turn an apparently straightforward conversion into extensive reconstruction.
Why is plumbing a major issue?
Office restrooms are often concentrated near the building core. Apartments require kitchens and bathrooms throughout each residential floor.
- Water lines
- Sanitary drainage
- Plumbing risers
- Ventilation
- Kitchen connections
- Bathroom connections
What happens to the office HVAC system?
Commercial heating and cooling systems may serve large office zones, while residential occupants generally need more individualized temperature control.
Why does the existing floor structure matter?
Some commercial buildings use post-tensioned concrete slabs containing highly tensioned steel cables. New residential plumbing penetrations may therefore require structural scanning and carefully planned routing.
Can windows and façades become a major cost?
Yes. Residential conversion can require new windows, operable sections, insulation improvements, façade repairs, or broader envelope work.
3. Does the local housing market support the conversion?
The Bottom Line: A technically convertible building can still fail if residential demand, achievable rents, unit absorption, or competing supply cannot support the investment.
- Achievable residential rents
- Residential vacancy
- Competing apartment supply
- Future development pipeline
- Unit mix and target price points
- Lease-up assumptions
- Transit access
- Nearby services and amenities
- Operating expenses
- Expected stabilized value
4. Do the conversion economics work?
The Bottom Line: Many buildings can physically become housing but still fail financially because acquisition, construction, financing, and carrying costs exceed what the completed residential property can support.
Brookings describes this as the feasibility gap.
Brookings modeled 18 potential conversions across six U.S. downtowns. Under its base assumptions, 16 of the 18 sample buildings had negative net present value after conversion costs.
Methodology note: These findings come from a defined study sample and should not be applied universally to every U.S. conversion candidate.
How much does an office-to-apartment conversion cost?
The Bottom Line: There is no reliable national cost-per-square-foot number that applies to every conversion.
Brookings' modeled analysis found average hard costs above $300 per square foot in five of the six markets studied. That figure belongs to the study's specific sample and assumptions.
- Building condition
- Floor-plate geometry
- Window and façade requirements
- Plumbing complexity
- Environmental issues
- Structural systems
- Local labor costs
- Financing terms
Why does the office acquisition price matter?
The Bottom Line: A lower acquisition basis leaves more room for redevelopment costs and can make a previously unworkable conversion worth investigating.
A distressed property acquired at a major discount can have very different project economics from an otherwise similar building that still trades near its former office valuation.
Investment caution: A discounted building is not automatically a bargain. Lower pricing may reflect deferred maintenance, environmental liabilities, structural problems, code issues, difficult debt, or weak demand.
Why do cities offer incentives for office conversions?
The Bottom Line: Public incentives can help close a feasibility gap when policymakers determine that a project produces sufficient housing, affordability, preservation, or redevelopment benefits.
- Tax abatements
- Tax increment financing
- Historic tax credits
- Low-cost financing
- Zoning flexibility
- Faster approvals
- Affordable-housing programs
Do office conversions automatically create affordable housing?
The Bottom Line: No. Conversion can add housing supply, but income-restricted or lower-cost housing generally requires a separate policy or financing mechanism.
Affordable units may depend on public subsidies, tax incentives, inclusionary requirements, affordable-housing financing, or other structured support.
Can office conversions solve the national housing supply gap?
The Bottom Line: No. Conversions can add meaningful local housing, but the national scale of the housing-supply challenge is much larger than the current office-conversion pipeline.
Realtor.com's March 2026 Housing Supply Gap Report estimated a cumulative U.S. housing supply gap of approximately 4.03 million homes in 2025.
That is Realtor.com's estimate using its methodology and should not be treated as a universally agreed count.
Could conversions help downtowns become more residential?
The Bottom Line: Adding residents can support activity beyond traditional office hours, but apartments alone do not create a complete neighborhood.
Residents can support grocery stores, restaurants, recreation, transit, entertainment, and services. Successful residential districts still need infrastructure, public spaces, transportation, and amenities.
Can conversions also help the office market?
The Bottom Line: Removing obsolete buildings from office inventory can reduce excess supply, although conversion alone does not guarantee an office-market recovery.
CBRE's 2025 analysis found 23.3 million square feet of office inventory slated for conversion or demolition compared with 12.7 million square feet of projected new deliveries.
What about the environmental case for adaptive reuse?
The Bottom Line: Reusing an existing structure can potentially avoid some material and embodied-carbon impacts associated with demolition and ground-up construction, but environmental benefits depend on the individual project.
The useful comparison is project-specific: how much of the existing structure can be retained, and what would the realistic alternative require?
Why is Chicago an important office-conversion case study?
The Bottom Line: Chicago ranks among the country's largest office-to-apartment conversion markets and shows how older buildings, vacancy, transit, incentives, affordability requirements, and downtown redevelopment can intersect.
National Apartment Association reporting based on RentCafe data placed Chicago at approximately 4,400 office-to-apartment units in the 2026 conversion pipeline, behind New York and Washington, D.C.
The lesson is not that every Chicago office can become housing. Even in a city actively supporting adaptive reuse, feasibility remains property-specific.
What should an investor review before acquiring a conversion candidate?
Building
- Floor-plate depth and geometry
- Window spacing and façade condition
- Structural grid and core position
- Slab type
- Plumbing pathways
- HVAC and electrical condition
- Elevators, stairs, fire and life safety
Market
- Achievable rents
- Residential vacancy
- Competing apartments
- Future residential supply
- Unit mix
- Lease-up assumptions
- Transit and services
Economics
- Acquisition basis
- Hard and soft costs
- Financing and carrying costs
- Contingency
- Rentable residential area
- Stabilized NOI
- Exit value
Policy
- Zoning
- Building-code requirements
- Historic restrictions
- Parking requirements
- Affordability obligations
- Tax incentives
- Approval timeline
What are the strongest objections to an office-conversion investment?
“Office buildings are cheap now. Isn't that enough?”
No. A lower acquisition basis helps, but poor geometry, structural problems, weak residential demand, or excessive redevelopment costs can still make the property unattractive.
“If a city needs housing, won't any conversion lease?”
No. Housing demand varies by location, unit type, price point, competing supply, and amenities.
“Is adaptive reuse automatically cheaper than new construction?”
No. Reusing a shell can avoid some costs, while plumbing, HVAC, façade, structural, environmental, and life-safety work can make some conversions expensive.
“Will incentives fix a weak project?”
Not necessarily. Incentives may help close a financing gap, but they cannot automatically fix poor geometry, unrealistic rents, weak demand, or major structural problems.
“If the pipeline is at a record, aren't conversions already proven?”
A large pipeline demonstrates interest. Completed and successfully stabilized projects demonstrate execution.
What are the limitations of this analysis?
The Bottom Line: Office-to-apartment feasibility is highly property-specific, and market data, public incentives, cost assumptions, and regulatory requirements can change.
National pipeline estimates can shift as projects enter, exit, or move through development. Cost studies may use different definitions of hard costs, soft costs, acquisition costs, and rentable area.
Professional guidance: This article is educational and is not a feasibility study, appraisal, engineering report, investment recommendation, legal advice, tax advice, or financial advice.
Frequently Asked Questions About Office-to-Apartment Conversions
What makes an office building suitable for apartment conversion?
A stronger candidate generally combines manageable floor depth, sufficient windows, adaptable structure, workable plumbing routes, residential demand, and a purchase price that leaves room for redevelopment costs.
Is it cheaper to convert an office than build apartments from the ground up?
Sometimes, but not always. Reusing an existing structure can avoid certain costs, while major mechanical, structural, façade, or environmental work can make conversion expensive.
How many office-to-apartment units are in the 2026 U.S. pipeline?
Approximately 90,300 units were reported in the U.S. office-to-apartment conversion pipeline at the beginning of 2026.
Does the pipeline figure represent completed apartments?
No. Pipeline figures include projects at different stages of development, and some may not reach completion.
Why are deep office floor plates difficult to convert?
Residential layouts generally need usable living areas around exterior windows. Deep office floors can leave large interior zones that are difficult to use efficiently as apartments.
Are office-to-apartment conversions good investments?
They can be when the building, market demand, acquisition basis, redevelopment cost, financing, and regulatory environment align.
Do office conversions create affordable housing?
Not automatically. Income-restricted housing often depends on subsidies, tax incentives, affordability requirements, or other structured financing.
Can office conversions solve the national housing shortage?
No. They can add useful local housing, but the current conversion pipeline remains much smaller than national housing-supply estimates.
The Investor Takeaway
Office-to-apartment conversions are no longer an unusual redevelopment strategy. The pipeline has grown substantially, and obsolete office inventory is beginning to leave some markets through conversion and demolition.
That creates opportunity without eliminating risk.
The practical framework remains:
- Building: Can the structure efficiently become housing?
- Market: Will residents support the finished product?
- Economics: Does stabilized value justify total cost?
- Policy: Can the project legally and financially move forward?
Evaluating a Real Estate Opportunity?
National trends can show where real estate is changing. A property-specific review helps determine whether an individual opportunity fits the market, costs, risks, and goals behind the investment.
Connect With DEI Realty LLCSources and Important Disclaimer
- National Apartment Association — Office-to-Apartment Conversions Hit Record Mark
- CBRE — Office Conversions and Demolitions Will Exceed New Construction in 2025
- Brookings Institution — A Community Guide to Office-to-Residential Conversion: Part 1, Economics
- Realtor.com Economic Research — Housing Supply Gap
Disclaimer: Market statistics are estimates and subject to change. This content is for educational purposes only and is not a formal appraisal, engineering assessment, feasibility study, investment recommendation, legal advice, tax advice, or financial advice.
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