Does office-to-residential conversion pencil in Denver in 2026?
For most downtown buildings, no. Conversion is the headline answer to record office vacancy, but the physics and the math kill the majority of candidates. The buildings that work share a short list of traits: a small or efficient floorplate, roughly 35 feet or less from window to core for light and air, a workable structural grid and plumbing layout, and most of all a basis low enough to absorb a conversion cost that can run toward $685 per square foot. Denver has real momentum, with the Downtown Development Authority approving $63 million for the High Fidelity Plaza project and tens of millions more across other towers. But the city's pilot program offers coordination, not cash, and the Colorado state conversion tax credit failed in the legislature. The low basis is the whole game.
Here's the pitch you've heard. Downtown Denver office vacancy hit a record, roughly 38.9% in the first quarter of 2026, with pockets east of Larimer above 40%. The Denver Tech Center sits around 19%, close to 9 million empty square feet. Convert the empty offices to apartments and you solve two problems at once: dead office space and a tight housing market.
The pitch is clean. The reality is that most of those buildings will never convert, and a developer who buys one assuming it will is buying a problem.
I'll walk you through what actually makes a building convertible, what it costs, what Denver and Colorado are doing to move the math, and how to screen a candidate before you fall in love with it.
Why most office buildings can't become apartments
Start with the floorplate, because it disqualifies most of the stock before you get to anything else.
Residential code wants light and air in every unit. That puts a hard limit on how far a living space can sit from a window. The working number across the conversion world is about 35 feet from window to core, the depth at which you can lay out apartments that get daylight without carving expensive light wells into the middle of the building (Urban Land Institute). Push past that and the interior goes dark, and dark square footage is dead square footage you still paid to buy and renovate.
This is why older buildings win. Avison Young estimated that only about one in three office buildings in the ten largest US markets is well suited to conversion, defined as built before 1990 with floorplates under 15,000 square feet (Urban Land Institute, Propmodo). Pre-1990 towers, and especially prewar ones, were designed before deep open-plan floors and central air made giant floorplates normal. They have smaller floors, more windows, higher ceilings, and tight cores. That is the profile that converts. The 1980s glass box with a 25,000 square foot floor and a fat central core usually does not.
The plumbing myth is worth clearing up too. People assume the existing risers make or break a project. They don't. Residential needs plumbing distributed across the whole floor, which means drilling thousands of new penetrations for wet stacks regardless of what's there (Propmodo). The real structural trap is post-tensioned concrete slabs, common in commercial towers, where the slab is held in tension by steel cables. Cut into one wrong and a single cable strike can run $25,000 or more to repair (Propmodo). That is the kind of surprise that turns a pro forma upside down.
So the screen, before you ever model a dollar, is physical:
- Floorplate. Small or efficient. Roughly 35 feet or less from window to core. Prewar and older Class B or C stock skews this way.
- Window-to-core depth. Enough perimeter glass to lay out daylit units without carving light wells.
- Structural grid. A column layout you can fit apartments around, ideally not a post-tensioned slab you'll be afraid to touch.
- Risers and stacks. Workable, knowing you're adding plumbing throughout no matter what.
- Systems and code. Egress, fire, and mechanical that can be brought to residential code without gutting the building to the steel.
A building can pass every one of those tests and still fail the only one that matters next.
The basis is the whole game
Here is the honest investor answer no one selling you a conversion wants to lead with. The physical screen tells you whether a building can convert. The basis tells you whether it should.
Purchasing and converting an office building to residential runs an average of about $685 per square foot (Construction Placements). That number swings with the building, but it sets the scale. Land plus hard costs plus soft costs plus carry have to land below what finished apartments in that location will support, on rent or on sale. Work backward from achievable residential value, subtract conversion cost, and whatever is left is the most you can pay for the building.
In a normal market that math almost never works, because the seller's office basis is too high. What changed in Denver is distress. Low-basis office is trading. When you can buy an obsolete Class B or C tower at a deep discount to its old value, the conversion cost stops being the dealbreaker and starts being the plan. The discount on the buy is what funds the build.
That is the entire thesis. Not the vacancy rate, not the housing shortage, not the incentive. The discount on acquisition is what makes conversion pencil, and the only buildings worth screening are the ones where the seller has already capitulated on price.
If you're weighing distressed office more broadly, I've written about whether DTC office at this vacancy is a value play or a trap, and separately about what distressed Denver office is actually pricing at right now. Conversion is one exit for that distress. It is not the only one, and it is rarely the easiest.
What Denver and Colorado are actually offering
The incentive picture matters because it can move marginal deals, but read it for what it is, not what the headlines imply.
Denver's Upper Downtown Adaptive Reuse Pilot Program pairs eligible building owners with city coordinators to move conversions through permitting, and the city has worked to streamline that review. What it does not do, at least so far, is write checks. The program is coordination and code help, not capital (City and County of Denver, Colorado Sun).
The capital comes from the Downtown Development Authority. Voters authorized the authority to take on up to $570 million in debt backed by downtown tax revenue, and it has approved roughly $242 million across a range of projects (Bisnow, Colorado Newsline). The flagship is High Fidelity Plaza, where the DDA approved a $63 million low-interest loan to The Luzzatto Co. to convert the two towers at 621 and 633 17th Street into about 700 units (Denver Gazette, Denverite).
Other funded conversions show the pipeline is real:
- Petroleum Building: $14 million approved to convert 12 floors into 178 apartments, with construction projected to start in mid-2026 (Denver Gazette).
- Symes Building: $17 million toward 116 apartments (Bisnow).
- University Building: $14.5 million toward 120 apartments (Bisnow).
- 1625 Broadway, Tower 2: a proposed $100 million conversion of roughly 420,000 square feet into 386 units, with concept plans submitted to the city in February 2026 (Developing MyCity).
Notice the common thread. These are older downtown buildings, many of them historic, with the floorplates and bones that convert. They line up exactly with the physical screen.
One thing the state did not deliver. A Colorado bill that would have created a refundable tax credit of up to $3 million per commercial-to-housing project starting in 2026 failed in the legislature (Construction Placements and Colorado coverage). So model your deal on local DDA financing and the federal and historic tools you can actually access, not on a state credit that isn't there. Treat every tax, zoning, and financing specific as something to confirm with your counsel and the city before you commit, because these programs and their terms change.
How to screen a candidate building
Run candidates in this order. The cheap tests come first so you kill bad deals before you spend on the expensive ones.
- Check the basis first. What can you buy it for, and is the seller genuinely distressed? If the price doesn't sit well below a residential-value-minus-conversion-cost number, stop here. Nothing downstream fixes a bad basis.
- Test the floorplate. Roughly 35 feet or less window to core, smaller floors, enough glass. Prewar and older Class B or C stock is where to look.
- Pressure-test the structure. Column grid you can lay units around, and find out early whether you're dealing with post-tensioned slabs.
- Price the conversion honestly. Use a real number for this building, anchored to the roughly $685 per square foot scale, not a hopeful one.
- Map the incentives last. DDA financing, the pilot program coordination, historic credits where they apply. Treat these as upside that can rescue a marginal deal, not as the foundation of the deal.
The order is the point. Most people fall in love with a building, then go looking for incentives to justify it. The discipline is the reverse. Basis and floorplate decide it. Everything else is detail.
Frequently asked questions
What makes an office building a good conversion candidate in Denver?
A small or efficient floorplate, roughly 35 feet or less from window to core so units get daylight, a workable structural grid, and older construction. Avison Young found only about one in three office buildings in major US markets fits, generally those built before 1990 with floorplates under 15,000 square feet. In Denver that points to older Class B and C and historic downtown stock, which is exactly what the DDA-funded conversions have been.
How much does office-to-residential conversion cost per square foot?
Buying and converting an office building to residential averages around $685 per square foot, though it varies widely with the building (Construction Placements). The cost is rarely the dealbreaker on its own. The acquisition basis is. A low enough purchase price on a distressed building is what lets a conversion pencil.
Does Denver offer incentives for office conversions?
Yes, but read them carefully. Denver's Upper Downtown Adaptive Reuse Pilot Program offers city coordination and permitting help, not direct funding. The Downtown Development Authority provides the capital, including a $63 million loan to the High Fidelity Plaza project and $14 million to $17 million each for the Petroleum, Symes, and University buildings. A Colorado state tax credit of up to $3 million per project failed in the legislature, so don't model around it. Confirm all current terms with the city and your counsel.
Why don't more Denver office buildings get converted?
Two reasons. Physically, most modern office floorplates are too deep to daylight as apartments without expensive light wells, so they don't qualify. Financially, the seller's basis is usually too high to absorb a conversion cost near $685 per square foot. Conversion only pencils where a distressed seller has already cut the price deep enough to fund the build.
Is conversion the best exit for distressed Denver office?
Sometimes, not usually. Conversion works for a specific building profile and a specific basis. For many distressed assets, a different play makes more sense. The honest analysis runs the conversion math against the alternatives before committing, rather than assuming conversion is the obvious fix for record vacancy.
The bottom line
Conversion gets pitched as the answer to record downtown vacancy. The honest investor read is that most buildings will never pencil, and the ones that do share a tight profile: an efficient floorplate, daylight depth around 35 feet, a workable structure, and above all a distressed basis low enough to carry a conversion cost near $685 per square foot. Denver's pipeline is real, with the DDA backing High Fidelity Plaza, the Petroleum Building, and others, but the program coordinates more than it funds, and the state credit didn't pass. Screen for basis and floorplate first. Treat incentives as upside, and confirm every tax and zoning detail with your counsel and the city.
If you want a current read on Denver deal flow and where the value is sitting right now, let's talk. Schedule time at brianmccririe.com/meet-with-brian-mccririe.
About Brian McCririe
Brian McCririe is Executive Managing Director of SVN | Denver Commercial and National Council Chair for Occupier Services across the SVN network. After 25 years representing tenants and investors across global markets, he now focuses on the Denver Metro area helping companies navigate leases, acquisitions, and the gap between what landlords offer and what occupiers deserve. He leads one of the metro's top tenant rep practices and writes about the deals, decisions, and market shifts that matter to corporate real estate leaders.
