2255 Champa St
2255 Champa St is a 7-story building in Greater Downtown Denver with 80% of its floor area within daylight reach of a facade. This screen estimates 81 homes and scores it 64 out of 100 for office-to-residential conversion suitability.
CO-1 · Screened 2026-09-19 · Worth a feasibility study
Also addressed as 900 Park Ave W: Denver’s address records place both on this one footprint.
Where 2255 Champa St is
Its block in Greater Downtown Denver, drawn from Denver's own building outlines and street centerlines.
- Already housing
- Not screened
- 2255 Champa St
This building does not pencil at default assumptions, even with a modeled RESIDE Act grant.
Across its 6 residential floors this building carries 18,852 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 2255 Champa St, 2026-09-19.
| Suitability scoreWorth a feasibility study | 64 / 100 |
|---|---|
| Storiesfrom 80 ft aerial-survey height ÷ 12 ft floor-to-floor | 7 |
| Height bandsfloor plate by floor range, from the city's roof outlines | Floors 1–5: 17,451 sq ft · Floors 6–7: 12,692 sq ft |
| Floor platetypical floor, from the city outlines | 17,451 sq ft |
| Daylight efficiencyshare within 35 ft of a facade | 80% |
| Deepest interior pointviability threshold is 80 ft | 61 ft |
| Windowless coretypical floor; the building-wide total is in the text above | 3,840 sq ft |
| Estimated homesat 750 sq ft average | 81 |
| Conversion cost$360/sq ft all-in on 95,190 sq ft | $34.3M |
| Gap before grantshortfall against completed value | $15.2M |
| Modeled RESIDE grantbelow the statutory cap | $4.9M |
| BuiltDenver does not publish a construction year with this data | — |
| ZoningFive Points | D-AS-12+ |
| Opportunity Zonenot in a 2018 designated tract | No |
The plan: window line, shape and floor rhythm
38 ft of exterior wall for each home the screen estimates — enough for two- and three-bedroom homes across the plan.
The typical floor has 541 ft of exterior wall, and across 6 residential floors the building carries 3,098 ft of it in total, divided among the 81 homes this screen estimates.
Its plate is compact at 0.75: close to a square or a circle, the most efficient envelope an office can have and the least generous one for apartments: little perimeter to divide among homes. How window line and plate shape are measured.
At the model’s 750 sq ft average, the plan works out at about 13.5 homes per floor, repeated on every residential floor, since this building's outline does not change as it rises.
Why 2255 Champa St scores 64 out of 100
Daylight efficiency 80, Interior depth 48, Scale 54, Finance 50 — each out of 100, then weighted.
Score components for 2255 Champa St. Points are the subscore times its weight.
| Component | Subscore | Weight | Points |
|---|---|---|---|
| Daylight efficiency80% of the floor area within 35 ft of a facade, scored from 40% up to 90% | 80 | 45% | 36.2 |
| Interior depthdeepest interior point 61 ft from a facade, scored from 80 ft down to 40 ft | 48 | 25% | 11.9 |
| Scale81 estimated homes, scored from 0 up to 150 | 54 | 15% | 8.1 |
| Financeremaining gap is 30% of conversion cost, scored from 60% down to 0% | 50 | 15% | 7.5 |
Most of what it earns comes from daylight efficiency, and what holds it back most is interior depth, at 48 out of 100: deepest interior point 61 ft from a facade, scored from 80 ft down to 40 ft.
What the conversion would cost
$360 per square foot all-in across 95,190 sq ft of converted floor, or $34.3M in total — about $423K for each of the 81 homes.
All-in cost per square foot for 2255 Champa St: 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 18,852 sq ft of windowless core, which has to be gutted, re-plumbed and sprinklered like the rest of the building and then earns nothing. Against it the model sets a completed value of $236K a home, which for 81 homes is $19.1M.
What would have to be true
A $15.2M gap before any grant, $10.3M after the modeled one. The smallest single change that would close it: average unit size 30% down.
The shortfall before any grant is $15.2M. Closing it from the value side means each of the 81 homes finishing at $423K rather than the $236K the model assumes — 79% more. Closing it from the cost side means getting all-in cost down from $360 to $201 per square foot.
A modeled RESIDE grant of $4.9M moves that threshold to $363K a home. That is still above the $236K assumed, leaving $10.3M uncovered, which is why the grant does not unlock this one.
Nor do all four levers have to move. For 2255 Champa St, one alone would close the gap at:
Single-assumption flip points for 2255 Champa St, each holding the other three at their defaults.
| Average unit sizethe binding constraint — the least this building would need | 30% downto 526 sq ft |
|---|---|
| Conversion cost per square foot | 42% downto $152/sq ft |
| Completed value per home | 54% upto $363K |
All four are sliders in the survey, where 2255 Champa St re-scores against your own numbers.
How it compares in Greater Downtown Denver
2255 Champa St ranks 152nd of the 214 buildings screened here, against a median score of 72.
Its floor plate is better lit than 41% of them, and shallower than 37% of them at its deepest interior point. On size it is the 176th 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 Five Points
13th of 20 in Five Points — the comparison that shares its rules, rents and streets.
Denver places 20 of the screened buildings in Five Points. 2255 Champa St ranks 13th of them against a median score of 68. 9 score 70 or more, their median deepest interior point is 61 ft from a facade against this building’s 61 ft, and together they would hold an estimated 5,122 homes. The group’s top scorer is 3355 Denargo St, at 90.
Its nearest match in size: 3198 Blake St
The screened building closest to 2255 Champa St in converted floor area is 3198 Blake St: 93,040 sq ft over 7 stories, against 95,190 sq ft over 7 here.
The two land within a few points of each other — 64 here, 64 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 4,700 ft apart.
Would it qualify for a RESIDE Act grant?
The model awards 2255 Champa St $4.9M, 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 2255 Champa St
The 4 closest the screen also covers, from 390 ft away. They are the colored outlines on the plan at the top of this page.
- 2307 Curtis St6 stories · 100% daylit · already an apartment buildingabout 390 ft away
- 2180 Stout St6 stories · 96% daylit · already an apartment buildingabout 790 ft away
- 2321 Arapahoe St7 stories · 93% daylit · already an apartment buildingabout 810 ft away
- 2175 California St10 stories · 86% daylit · already an apartment buildingabout 870 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.