370 17th St
370 17th St is a 60-story building in Greater Downtown Denver with 71% of its floor area within daylight reach of a facade. This screen estimates 1,140 homes and scores it 57 out of 100 for office-to-residential conversion suitability.
CO-1 · Screened 2026-09-19 · Worth a feasibility study
Where 370 17th St is
Its block in Greater Downtown Denver, drawn from Denver's own building outlines and street centerlines.
- Already housing
- Not screened
- 370 17th St
This building does not pencil at default assumptions, even with a modeled RESIDE Act grant.
Every floor carries 7,373 sq ft of windowless core — area that must be gutted, re-plumbed and sprinklered but can never be rented as an apartment. Across 59 residential floors that is 435,002 sq ft of cost carrying no revenue.
Modeled conversion metrics for 370 17th St, 2026-09-19.
| Suitability scoreWorth a feasibility study | 57 / 100 |
|---|---|
| Storiesfrom 717 ft aerial-survey height ÷ 12 ft floor-to-floor | 60 |
| Floor plateper floor, from the city footprint | 25,500 sq ft |
| Daylight efficiencyshare within 35 ft of a facade | 71% |
| Deepest interior pointviability threshold is 80 ft | 62 ft |
| Windowless coreper floor — renovated but never rentable | 7,373 sq ft |
| Estimated homesat 750 sq ft average | 1,140 |
| Conversion cost$360/sq ft all-in on 1,504,502 sq ft | $541.6M |
| Gap before grantshortfall against completed value | $272.6M |
| Modeled RESIDE grantat the statutory per-award cap | $10.0M |
| 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
34 ft of exterior wall for each home the screen estimates — enough for two- and three-bedroom homes across the plan.
The typical floor has 658 ft of exterior wall, and across 59 residential floors the building carries 38,817 ft of it in total, divided among the 1,140 homes this screen estimates.
Its plate is compact at 0.74: 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 19.3 homes per floor, repeated on every residential floor, since this building's outline does not change as it rises.
Why 370 17th St scores 57 out of 100
Daylight efficiency 62, Interior depth 44, Scale 100, Finance 19 — each out of 100, then weighted.
Score components for 370 17th St. Points are the subscore times its weight.
| Component | Subscore | Weight | Points |
|---|---|---|---|
| Daylight efficiency71% of the floor area within 35 ft of a facade, scored from 40% up to 90% | 62 | 45% | 28.0 |
| Interior depthdeepest interior point 62 ft from a facade, scored from 80 ft down to 40 ft | 44 | 25% | 11.0 |
| Scale1140 estimated homes, scored from 0 up to 150 | 100 | 15% | 15.0 |
| Financeremaining gap is 48% of conversion cost, scored from 60% down to 0% | 19 | 15% | 2.9 |
Most of what it earns comes from daylight efficiency, and what holds it back most is finance, at 19 out of 100: remaining gap is 48% of conversion cost, scored from 60% down to 0%.
What the conversion would cost
$360 per square foot all-in across 1,504,502 sq ft of converted floor, or $541.6M in total — about $475K for each of the 1,140 homes.
All-in cost per square foot for 370 17th 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 435,002 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 1,140 homes is $269.0M.
What would have to be true
A $272.6M gap before any grant, $262.6M after the modeled one. The smallest single change that would close it: average unit size 49% down.
The shortfall before any grant is $272.6M. Closing it from the value side means each of the 1,140 homes finishing at $475K rather than the $236K the model assumes — 101% more. Closing it from the cost side means getting all-in cost down from $360 to $179 per square foot.
A modeled RESIDE grant of $10.0M moves that threshold to $466K a home. That is still above the $236K assumed, leaving $262.6M uncovered, which is why the grant does not unlock this one.
Nor do all four levers have to move. For 370 17th St, one alone would close the gap at:
Single-assumption flip points for 370 17th St, each holding the other three at their defaults.
| Average unit sizethe binding constraint — the least this building would need | 49% downto 380 sq ft |
|---|---|
| Conversion cost per square foot | 67% downto $85/sq ft |
| Completed value per home | 98% upto $466K |
All four are sliders in the survey, where 370 17th St re-scores against your own numbers.
How it compares in Greater Downtown Denver
370 17th St ranks 178th of the 214 buildings screened here, against a median score of 72.
Its floor plate is better lit than 17% of them, and shallower than 25% of them at its deepest interior point. On size it is the 10th 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
63rd of 75 in CBD, 62nd of 72 zoned D-C — the comparison that shares its rules, rents and streets.
Denver places 75 of the screened buildings in CBD. 370 17th St ranks 63rd 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 62 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. 370 17th St ranks 62nd 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 62 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: 1801 California St
The screened building closest to 370 17th St in converted floor area is 1801 California St: 1,946,868 sq ft over 59 stories, against 1,504,502 sq ft over 60 here.
370 17th St scores 57 to its 52, and with the size held roughly equal most of that lead comes from daylight efficiency: 62 out of 100 here, 53 there (67% of the floor area within 35 ft of a facade, scored from 40% up to 90%). On the money they sit in the same place: each falls short even with the modeled grant. The two stand about 1,600 ft apart.
The city's own study picked this building too
In August 2023 Denver and the architecture firm Gensler rated 21 downtown office buildings good candidates for conversion to housing and published the top 16 by address. One of them resolves to this building: “370 17th St”.
That is an outside opinion reached by different means — architects reading plans, not a model reading outlines — and this screen partly agrees: 370 17th St scores 57 here, worth a feasibility study but not in this screen’s strongest tier. The difference is the money rather than the geometry: at default assumptions the gap here is $272.6M, which no modeled RESIDE grant closes. A study asking whether a building can be converted and a model asking whether it would pencil are answering different questions.
Mile High CRE, Study Identifies 21 Downtown Denver Office Buildings as Good Candidates for Conversion. The full comparison across all 16 is on the Greater Downtown Denver page.
Would it qualify for a RESIDE Act grant?
The model awards 370 17th St $10.0M, 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 370 17th St
The 4 closest the screen also covers, from 140 ft away. They are the colored outlines on the plan at the top of this page.
- 1625 Court Pl5 stories · 92% daylit · 43 estimated homes · scores 80/100 (Strong candidate)about 140 ft away
- 303 16th St5 stories · 90% daylit · 57 estimated homes · scores 80/100 (Strong candidate)about 220 ft away
- 410 17th St27 stories · 81% daylit · 397 estimated homes · scores 74/100 (Strong candidate)about 230 ft away
- 321 17th St20 stories · 84% daylit · 321 estimated homes · scores 68/100 (Worth a feasibility study)about 340 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.