1441 18th St
1441 18th St is a 12-story building in Greater Downtown Denver with 88% of its floor area within daylight reach of a facade. This screen estimates 200 homes and scores it 78 out of 100 for office-to-residential conversion suitability.
CO-1 · Screened 2026-09-19 · Strong candidate
Also addressed as 1808 Blake St, 1810 Blake St, 1814 Blake St, 1816 Blake St, 1820 Blake St, 1822 Blake St, 1830 Blake St, 1834 Blake St and 1836 Blake St: Denver’s address records place all 10 on this one footprint.
Where 1441 18th St is
Its block in Greater Downtown Denver, drawn from Denver's own building outlines and street centerlines.
- Already housing
- Not screened
- 1441 18th St
This building does not pencil at default assumptions, even with a modeled RESIDE Act grant.
Across its 11 residential floors this building carries 24,507 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 3 apartments here, alongside 1 non-residential record. 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 10 street addresses across 48,841 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 1441 18th St, 2026-09-19.
| Suitability scoreStrong candidate | 78 / 100 |
|---|---|
| Storiesfrom 144 ft aerial-survey height ÷ 12 ft floor-to-floor | 12 |
| Height bandsfloor plate by floor range, from the city's roof outlines | Floors 1–2: 48,841 sq ft · Floor 3: 44,781 sq ft · Floor 4: 29,334 sq ft · Floor 5: 21,707 sq ft · Floor 6: 11,553 sq ft · Floors 7–10: 10,018 sq ft · Floors 11–12: 8,285 sq ft |
| Floor platetypical floor, from the city outlines | 48,841 sq ft |
| Daylight efficiencyshare within 35 ft of a facade | 88% |
| Deepest interior pointviability threshold is 80 ft | 62 ft |
| Windowless coretypical floor; the building-wide total is in the text above | 12,743 sq ft |
| Estimated homesat 750 sq ft average | 200 |
| Conversion cost$360/sq ft all-in on 212,860 sq ft | $76.6M |
| Gap before grantshortfall against completed value | $29.4M |
| 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
40 ft of exterior wall for each home the screen estimates — enough for two- and three-bedroom homes across the plan.
The typical floor has 1,219 ft of exterior wall, and across 11 residential floors the building carries 8,054 ft of it in total, divided among the 200 homes this screen estimates.
Its plate is elongated at 0.41: 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 18.2 homes per floor, repeated on every residential floor, since this building's outline does not change as it rises.
Why 1441 18th St scores 78 out of 100
Daylight efficiency 97, Interior depth 44, Scale 100, Finance 58 — each out of 100, then weighted.
Score components for 1441 18th St. Points are the subscore times its weight.
| Component | Subscore | Weight | Points |
|---|---|---|---|
| Daylight efficiency88% of the floor area within 35 ft of a facade, scored from 40% up to 90% | 97 | 45% | 43.6 |
| Interior depthdeepest interior point 62 ft from a facade, scored from 80 ft down to 40 ft | 44 | 25% | 11.1 |
| Scale200 estimated homes, scored from 0 up to 150 | 100 | 15% | 15.0 |
| Financeremaining gap is 25% of conversion cost, scored from 60% down to 0% | 58 | 15% | 8.7 |
Most of what it earns comes from daylight efficiency, and what holds it back most is interior depth, at 44 out of 100: deepest interior point 62 ft from a facade, scored from 80 ft down to 40 ft.
What the conversion would cost
$360 per square foot all-in across 212,860 sq ft of converted floor, or $76.6M in total — about $383K for each of the 200 homes.
All-in cost per square foot for 1441 18th 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 24,507 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 200 homes is $47.2M.
What would have to be true
A $29.4M gap before any grant, $19.4M after the modeled one. The smallest single change that would close it: average unit size 29% down.
The shortfall before any grant is $29.4M. Closing it from the value side means each of the 200 homes finishing at $383K rather than the $236K the model assumes — 62% more. Closing it from the cost side means getting all-in cost down from $360 to $222 per square foot.
A modeled RESIDE grant of $10.0M moves that threshold to $333K a home. That is still above the $236K assumed, leaving $19.4M uncovered, which is why the grant does not unlock this one.
Nor do all four levers have to move. For 1441 18th St, one alone would close the gap at:
Single-assumption flip points for 1441 18th St, each holding the other three at their defaults.
| Average unit sizethe binding constraint — the least this building would need | 29% downto 532 sq ft |
|---|---|
| Conversion cost per square foot | 35% downto $169/sq ft |
| Completed value per home | 41% upto $333K |
All four are sliders in the survey, where 1441 18th St re-scores against your own numbers.
How it compares in Greater Downtown Denver
1441 18th St ranks 82nd of the 214 buildings screened here, against a median score of 72.
Its floor plate is better lit than 68% of them, and shallower than 25% of them at its deepest interior point. On size it is the 107th 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
17th of 55 in Union Station, 5th of 29 zoned D-LD — the comparison that shares its rules, rents and streets.
Denver places 55 of the screened buildings in Union Station. 1441 18th St ranks 17th 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 62 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. 1441 18th St ranks 5th 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 62 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: 300 E 17th Ave
The screened building closest to 1441 18th St in converted floor area is 300 E 17th Ave: 210,568 sq ft over 12 stories, against 212,860 sq ft over 12 here.
1441 18th St scores 78 to its 96, and with the size held roughly equal most of that shortfall comes from interior depth: 44 out of 100 here, 100 there (deepest interior point 35 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 5,100 ft apart.
Would it qualify for a RESIDE Act grant?
The model awards 1441 18th 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 1441 18th 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.
- 1801 Blake St8 stories · 71% daylit · 364 estimated homes · scores 56/100 (Worth a feasibility study)about 270 ft away
- 1370 19th St12 stories · 76% daylit · already an apartment buildingabout 350 ft away
- 1755 Blake St5 stories · 75% daylit · 85 estimated homes · scores 58/100 (Worth a feasibility study)about 440 ft away
- 1401 17th St17 stories · 79% daylit · 266 estimated homes · scores 69/100 (Worth a feasibility study)about 490 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.