333 W Colfax Ave
333 W Colfax Ave is a 6-story building in Greater Downtown Denver with 100% of its floor area within daylight reach of a facade. This screen estimates 33 homes and scores it 85 out of 100 for office-to-residential conversion suitability.
CO-1 · Screened 2026-09-19 · Strong candidate
Where 333 W Colfax Ave is
Its block in Greater Downtown Denver, drawn from Denver's own building outlines and street centerlines.
- Already housing
- Not screened
- 333 W Colfax Ave
This building does not pencil at default assumptions, even with a modeled RESIDE Act grant.
Across its 5 residential floors this building carries 0 sq ft of windowless core — area that must be gutted, re-plumbed and sprinklered but can never be rented as an apartment.
Modeled conversion metrics for 333 W Colfax Ave, 2026-09-19.
| Suitability scoreStrong candidate | 85 / 100 |
|---|---|
| Storiesfrom 71 ft aerial-survey height ÷ 12 ft floor-to-floor | 6 |
| Height bandsfloor plate by floor range, from the city's roof outlines | Floor 1: 10,324 sq ft · Floors 2–5: 7,592 sq ft · Floor 6: 1,392 sq ft |
| Floor platetypical floor, from the city outlines | 7,592 sq ft |
| Daylight efficiencyshare within 35 ft of a facade | 100% |
| Deepest interior pointviability threshold is 80 ft | 31 ft |
| Windowless coretypical floor; the building-wide total is in the text above | 0 sq ft |
| Estimated homesat 750 sq ft average | 33 |
| Conversion cost$360/sq ft all-in on 31,760 sq ft | $11.4M |
| Gap before grantshortfall against completed value | $3.6M |
| Modeled RESIDE grantbelow the statutory cap | $2.0M |
| BuiltDenver does not publish a construction year with this data | — |
| ZoningCBD | D-C |
| Opportunity Zonenot in a 2018 designated tract | No |
The plan: window line, shape and floor rhythm
50 ft of exterior wall for each home the screen estimates — enough for two- and three-bedroom homes across the plan.
The typical floor has 367 ft of exterior wall, and across 5 residential floors the building carries 1,638 ft of it in total, divided among the 33 homes this screen estimates.
Its plate is moderately compact at 0.71: a squarish plan, with enough perimeter for a conventional double-loaded corridor. How window line and plate shape are measured.
At the model’s 750 sq ft average, the plan works out at about 6.6 homes per floor. Its floors are not alike, though: the typical floor's deepest interior point is 31 ft from a facade, while its worst floor reaches 37 ft. The score follows the typical floor, so a podium that could not hold a bedroom does not by itself sink a slim tower above it — but it is there, and it is part of what would have to be drawn around.
Why 333 W Colfax Ave scores 85 out of 100
Daylight efficiency 100, Interior depth 100, Scale 22, Finance 76 — each out of 100, then weighted.
Score components for 333 W Colfax Ave. Points are the subscore times its weight.
| Component | Subscore | Weight | Points |
|---|---|---|---|
| Daylight efficiency100% of the floor area within 35 ft of a facade, scored from 40% up to 90% | 100 | 45% | 45.0 |
| Interior depthdeepest interior point 31 ft from a facade, scored from 80 ft down to 40 ft | 100 | 25% | 25.0 |
| Scale33 estimated homes, scored from 0 up to 150 | 22 | 15% | 3.3 |
| Financeremaining gap is 15% of conversion cost, scored from 60% down to 0% | 76 | 15% | 11.4 |
Most of what it earns comes from daylight efficiency, and what holds it back most is scale, at 22 out of 100: 33 estimated homes, scored from 0 up to 150.
What the conversion would cost
$360 per square foot all-in across 31,760 sq ft of converted floor, or $11.4M in total — about $346K for each of the 33 homes.
All-in cost per square foot for 333 W Colfax Ave: base cost plus the code work a change of use triggers.
| Base conversion cost | $260/sq ft |
|---|---|
| Plumbing risers to every unit | $40/sq ft |
| Operable windows and glazing | $30/sq ft |
| Additional egress stair | $18/sq ft |
| Fire sprinklers (NFPA 13R) | $12/sq ft |
| All-in | $360/sq ft |
That cost is charged across every converted square foot, including the circulation and service area that earns nothing directly. Against it the model sets a completed value of $236K a home, which for 33 homes is $7.8M.
What would have to be true
A $3.6M gap before any grant, $1.7M after the modeled one. The smallest single change that would close it: average unit size 13% down.
The shortfall before any grant is $3.6M. Closing it from the value side means each of the 33 homes finishing at $346K rather than the $236K the model assumes — 47% more. Closing it from the cost side means getting all-in cost down from $360 to $245 per square foot.
A modeled RESIDE grant of $2.0M moves that threshold to $286K a home. That is still above the $236K assumed, leaving $1.7M uncovered, which is why the grant does not unlock this one.
Nor do all four levers have to move. For 333 W Colfax Ave, one alone would close the gap at:
Single-assumption flip points for 333 W Colfax Ave, each holding the other three at their defaults.
| Average unit sizethe binding constraint — the least this building would need | 13% downto 651 sq ft |
|---|---|
| Circulation efficiency | 15% upto 92% |
| Conversion cost per square foot | 20% downto $208/sq ft |
| Completed value per home | 21% upto $286K |
All four are sliders in the survey, where 333 W Colfax Ave re-scores against your own numbers.
How it compares in Greater Downtown Denver
333 W Colfax Ave ranks 58th of the 214 buildings screened here, against a median score of 72.
Its floor plate is better lit than 100% of them, and shallower than 94% of them at its deepest interior point. On size it is the 211th largest by estimated homes. The full survey of all 214 buildings ranks and maps every one of them, and the list by address links each to its own page.
Within CBD and the D-C zone
18th of 75 in CBD, 16th of 72 zoned D-C — the comparison that shares its rules, rents and streets.
Denver places 75 of the screened buildings in CBD. 333 W Colfax Ave ranks 18th of them against a median score of 71. 40 score 70 or more, their median deepest interior point is 56 ft from a facade against this building’s 31 ft, and together they would hold an estimated 33,698 homes. The group’s top scorer is 918 17th St, at 97.
72 of the screened buildings are zoned D-C. 333 W Colfax Ave ranks 16th of them against a median score of 73. 39 score 70 or more, their median deepest interior point is 57 ft from a facade against this building’s 31 ft, and together they would hold an estimated 32,881 homes. The group’s top scorer is 721 19th St, at 95.
Its nearest match in size: 1485 Delgany St
The screened building closest to 333 W Colfax Ave in converted floor area is 1485 Delgany St: 33,170 sq ft over 6 stories, against 31,760 sq ft over 6 here.
The two land within a few points of each other — 85 here, 85 there — so at this size the screen reads them as much the same prospect. On the money they sit in the same place: each falls short even with the modeled grant. The two stand about 5,400 ft apart.
Would it qualify for a RESIDE Act grant?
The model awards 333 W Colfax Ave $2.0M, on the assumption it qualifies. Whether it does, no published dataset can say.
That figure assumes the building meets the Act’s vacant-and-abandoned test, which turns on code-enforcement and receivership records no city publishes.
It does not sit in a 2018 designated Opportunity Zone, so it would not draw that Section 201 priority.
Other buildings screened near 333 W Colfax Ave
The 4 closest the screen also covers, from 210 ft away. They are the colored outlines on the plan at the top of this page.
- 1359 Court Pl15 stories · 87% daylit · 138 estimated homes · scores 90/100 (Strong candidate)about 210 ft away
- 320 W Colfax Ave7 stories · 57% daylit · 215 estimated homes · scores 32/100 (Marginal)about 410 ft away
- 440 14th St19 stories · 92% daylit · 254 estimated homes · scores 94/100 (Strong candidate)about 430 ft away
- 490 W Colfax Ave8 stories · 56% daylit · 263 estimated homes · scores 30/100 (Marginal)about 460 ft away
A screen, not a feasibility study, from outlines and heights rather than plans: the method and how to correct a figure. If you know this building’s interior, you know what this model cannot see.