1600 15th St
1600 15th 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 182 homes and scores it 68 out of 100 for office-to-residential conversion suitability.
CO-1 · Screened 2026-09-19 · Worth a feasibility study
Also addressed as 1610 15th St, 1614 15th St, 1435 Wazee St, 1441 Wazee St and 1430 Wynkoop St: Denver’s address records place all 6 on this one footprint.
Where 1600 15th St is
Its block in Greater Downtown Denver, drawn from Denver's own building outlines and street centerlines.
- Already housing
- Not screened
- 1600 15th St
This building does not pencil at default assumptions, even with a modeled RESIDE Act grant.
Across its 6 residential floors this building carries 42,034 sq ft of windowless core — area that must be gutted, re-plumbed and sprinklered but can never be rented as an apartment.
Part of this building is already homes. Denver's property records list 36 condominiums here, alongside 5 non-residential records. The figures here treat the whole building as convertible, so read them as an upper bound and check which floors are already housing.
Read with caution. This footprint carries 6 street addresses across 49,752 sq ft, which usually means the city’s GIS has merged a block or complex into a single polygon rather than describing one convertible building.
Modeled conversion metrics for 1600 15th St, 2026-09-19.
| Suitability scoreWorth a feasibility study | 68 / 100 |
|---|---|
| Storiesfrom 81 ft aerial-survey height ÷ 12 ft floor-to-floor | 7 |
| Height bandsfloor plate by floor range, from the city's roof outlines | Floor 1: 57,205 sq ft · Floor 2: 49,752 sq ft · Floor 3: 48,304 sq ft · Floor 4: 45,565 sq ft · Floor 5: 43,304 sq ft · Floor 6: 22,788 sq ft · Floor 7: 3,785 sq ft |
| Floor platetypical floor, from the city outlines | 49,752 sq ft |
| Daylight efficiencyshare within 35 ft of a facade | 80% |
| Deepest interior pointviability threshold is 80 ft | 65 ft |
| Windowless coretypical floor; the building-wide total is in the text above | 12,649 sq ft |
| Estimated homesat 750 sq ft average | 182 |
| Conversion cost$360/sq ft all-in on 213,498 sq ft | $76.9M |
| Gap before grantshortfall against completed value | $33.9M |
| Modeled RESIDE grantat the statutory per-award cap | $10.0M |
| BuiltDenver does not publish a construction year with this data | — |
| ZoningUnion Station | D-LD |
| Opportunity Zonenot in a 2018 designated tract | No |
The plan: window line, shape and floor rhythm
36 ft of exterior wall for each home the screen estimates — enough for two- and three-bedroom homes across the plan.
The typical floor has 1,320 ft of exterior wall, and across 6 residential floors the building carries 6,596 ft of it in total, divided among the 182 homes this screen estimates.
Its plate is elongated at 0.36: a slab or an L, which is why so much of the floor lies within reach of a window: the outline buys daylight that a square plan of the same area would not. How window line and plate shape are measured.
At the model’s 750 sq ft average, the plan works out at about 30.3 homes per floor, repeated on every residential floor, since this building's outline does not change as it rises.
Why 1600 15th St scores 68 out of 100
Daylight efficiency 81, Interior depth 38, Scale 100, Finance 48 — each out of 100, then weighted.
Score components for 1600 15th 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% | 81 | 45% | 36.3 |
| Interior depthdeepest interior point 65 ft from a facade, scored from 80 ft down to 40 ft | 38 | 25% | 9.4 |
| Scale182 estimated homes, scored from 0 up to 150 | 100 | 15% | 15.0 |
| Financeremaining gap is 31% of conversion cost, scored from 60% down to 0% | 48 | 15% | 7.2 |
Most of what it earns comes from daylight efficiency, and what holds it back most is interior depth, at 38 out of 100: deepest interior point 65 ft from a facade, scored from 80 ft down to 40 ft.
What the conversion would cost
$360 per square foot all-in across 213,498 sq ft of converted floor, or $76.9M in total — about $422K for each of the 182 homes.
All-in cost per square foot for 1600 15th 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 42,034 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 182 homes is $43.0M.
What would have to be true
A $33.9M gap before any grant, $23.9M after the modeled one. The smallest single change that would close it: average unit size 36% down.
The shortfall before any grant is $33.9M. Closing it from the value side means each of the 182 homes finishing at $422K 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 $10.0M moves that threshold to $367K a home. That is still above the $236K assumed, leaving $23.9M uncovered, which is why the grant does not unlock this one.
Nor do all four levers have to move. For 1600 15th St, one alone would close the gap at:
Single-assumption flip points for 1600 15th St, each holding the other three at their defaults.
| Average unit sizethe binding constraint — the least this building would need | 36% downto 483 sq ft |
|---|---|
| Conversion cost per square foot | 43% downto $148/sq ft |
| Completed value per home | 56% upto $367K |
All four are sliders in the survey, where 1600 15th St re-scores against your own numbers.
How it compares in Greater Downtown Denver
1600 15th St ranks 129th of the 214 buildings screened here, against a median score of 72.
Its floor plate is better lit than 42% of them, and shallower than 16% of them at its deepest interior point. On size it is the 112th 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 Union Station and the D-LD zone
29th of 55 in Union Station, 15th of 29 zoned D-LD — the comparison that shares its rules, rents and streets.
Denver places 55 of the screened buildings in Union Station. 1600 15th St ranks 29th of them against a median score of 69. 23 score 70 or more, their median deepest interior point is 61 ft from a facade against this building’s 65 ft, and together they would hold an estimated 13,167 homes. The group’s top scorer is 1600 17th St, at 95.
29 of the screened buildings are zoned D-LD. 1600 15th St ranks 15th of them against a median score of 68. 10 score 70 or more, their median deepest interior point is 61 ft from a facade against this building’s 65 ft, and together they would hold an estimated 5,069 homes. The group’s top scorer is 1600 17th St, at 95.
Its nearest match in size: 1325 Glenarm Pl
The screened building closest to 1600 15th St in converted floor area is 1325 Glenarm Pl: 221,180 sq ft over 7 stories, against 213,498 sq ft over 7 here.
The two land within a few points of each other — 68 here, 70 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 3,900 ft apart.
Would it qualify for a RESIDE Act grant?
The model awards 1600 15th 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 1600 15th 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.
- 1450 Wynkoop St6 stories · 86% daylit · already a condominium buildingabout 140 ft away
- 1500 15th St5 stories · 82% daylit · 80 estimated homes · scores 65/100 (Worth a feasibility study)about 260 ft away
- 1449 Wynkoop St7 stories · 82% daylit · already a condominium buildingabout 310 ft away
- 1500 Wynkoop St7 stories · 90% daylit · 61 estimated homes · scores 80/100 (Strong candidate)about 310 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.