600 16th St
600 16th St is a 6-story building in Greater Downtown Denver with 87% of its floor area within daylight reach of a facade. This screen estimates 51 homes and scores it 74 out of 100 for office-to-residential conversion suitability.
CO-1 · Screened 2026-09-19 · Strong candidate
Also addressed as 610 16th St, 614 16th St, 618 16th St, 1575 Welton St and 1599 Welton St: Denver’s address records place all 6 on this one footprint.
Where 600 16th St is
Its block in Greater Downtown Denver, drawn from Denver's own building outlines and street centerlines.
- Already housing
- Not screened
- 600 16th St
This building does not pencil at default assumptions, even with a modeled RESIDE Act grant.
Across its 5 residential floors this building carries 7,308 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 600 16th St, 2026-09-19.
| Suitability scoreStrong candidate | 74 / 100 |
|---|---|
| Storiesfrom 75 ft aerial-survey height ÷ 12 ft floor-to-floor | 6 |
| Height bandsfloor plate by floor range, from the city's roof outlines | Floors 1–5: 13,401 sq ft · Floor 6: 1,738 sq ft |
| Floor platetypical floor, from the city outlines | 13,401 sq ft |
| Daylight efficiencyshare within 35 ft of a facade | 87% |
| Deepest interior pointviability threshold is 80 ft | 51 ft |
| Windowless coretypical floor; the building-wide total is in the text above | 1,827 sq ft |
| Estimated homesat 750 sq ft average | 51 |
| Conversion cost$360/sq ft all-in on 55,343 sq ft | $19.9M |
| Gap before grantshortfall against completed value | $7.9M |
| Modeled RESIDE grantbelow the statutory cap | $3.1M |
| 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
44 ft of exterior wall for each home the screen estimates — enough for two- and three-bedroom homes across the plan.
The typical floor has 499 ft of exterior wall, and across 5 residential floors the building carries 2,230 ft of it in total, divided among the 51 homes this screen estimates.
Its plate is moderately compact at 0.68: 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 10.2 homes per floor, repeated on every residential floor, since this building's outline does not change as it rises.
Why 600 16th St scores 74 out of 100
Daylight efficiency 94, Interior depth 73, Scale 34, Finance 60 — each out of 100, then weighted.
Score components for 600 16th St. Points are the subscore times its weight.
| Component | Subscore | Weight | Points |
|---|---|---|---|
| Daylight efficiency87% of the floor area within 35 ft of a facade, scored from 40% up to 90% | 94 | 45% | 42.1 |
| Interior depthdeepest interior point 51 ft from a facade, scored from 80 ft down to 40 ft | 73 | 25% | 18.2 |
| Scale51 estimated homes, scored from 0 up to 150 | 34 | 15% | 5.1 |
| Financeremaining gap is 24% of conversion cost, scored from 60% down to 0% | 60 | 15% | 8.9 |
Most of what it earns comes from daylight efficiency, and what holds it back most is scale, at 34 out of 100: 51 estimated homes, scored from 0 up to 150.
What the conversion would cost
$360 per square foot all-in across 55,343 sq ft of converted floor, or $19.9M in total — about $391K for each of the 51 homes.
All-in cost per square foot for 600 16th 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 7,308 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 51 homes is $12.0M.
What would have to be true
A $7.9M gap before any grant, $4.8M after the modeled one. The smallest single change that would close it: average unit size 25% down.
The shortfall before any grant is $7.9M. Closing it from the value side means each of the 51 homes finishing at $391K rather than the $236K the model assumes — 66% more. Closing it from the cost side means getting all-in cost down from $360 to $217 per square foot.
A modeled RESIDE grant of $3.1M moves that threshold to $331K a home. That is still above the $236K assumed, leaving $4.8M uncovered, which is why the grant does not unlock this one.
Nor do all four levers have to move. For 600 16th St, one alone would close the gap at:
Single-assumption flip points for 600 16th St, each holding the other three at their defaults.
| Average unit sizethe binding constraint — the least this building would need | 25% downto 565 sq ft |
|---|---|
| Conversion cost per square foot | 34% downto $173/sq ft |
| Completed value per home | 40% upto $331K |
All four are sliders in the survey, where 600 16th St re-scores against your own numbers.
How it compares in Greater Downtown Denver
600 16th St ranks 100th of the 214 buildings screened here, against a median score of 72.
Its floor plate is better lit than 63% of them, and shallower than 64% of them at its deepest interior point. On size it is the 201st 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
34th of 75 in CBD, 34th of 72 zoned D-C — the comparison that shares its rules, rents and streets.
Denver places 75 of the screened buildings in CBD. 600 16th St ranks 34th 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 51 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. 600 16th St ranks 34th 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 51 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: 530 E 20th Ave
The screened building closest to 600 16th St in converted floor area is 530 E 20th Ave: 55,812 sq ft over 7 stories, against 55,343 sq ft over 6 here.
600 16th St scores 74 to its 88, and with the size held roughly equal most of that shortfall comes from interior depth: 73 out of 100 here, 100 there (deepest interior point 28 ft from a facade, scored from 80 ft down to 40 ft). On the money they sit in the same place: each falls short even with the modeled grant. The two stand about 3,300 ft apart.
Would it qualify for a RESIDE Act grant?
The model awards 600 16th St $3.1M, 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 600 16th St
The 4 closest the screen also covers, from 270 ft away. They are the colored outlines on the plan at the top of this page.
- 675 15th St38 stories · 58% daylit · 1,009 estimated homes · scores 32/100 (Marginal)about 270 ft away
- 535 16th St13 stories · 88% daylit · 224 estimated homes · scores 84/100 (Strong candidate)about 300 ft away
- 707 15th St11 stories · 65% daylit · already an apartment buildingabout 380 ft away
- 600 17th St34 stories · 82% daylit · 651 estimated homes · scores 73/100 (Strong candidate)about 390 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.