1840 15th St

1840 15th St is a 14-story apartment building in Greater Downtown Denver. Its floor plate has 87% of its area within daylight reach of a facade and scores 77 out of 100 on this screen’s measures, which is part of why it works as housing.

CO-1 · Screened 2026-09-19 · Already housing

Also addressed as 1422 Delgany St, 1446 Delgany St, 1490 Delgany St and 1401 Wewatta St: Denver’s address records place all 5 on this one footprint.

Where 1840 15th St is

Its block in Greater Downtown Denver, drawn from Denver's own building outlines and street centerlines.

Suitability score

0–29

30–49

50–69

70–100

Already housing
Not screened
1840 15th St

1840 15th St and the 1,000 ft of Greater Downtown Denver around it. The streets are drawn at the width of the right-of-way they run down, sidewalks included, and named, and every building on these blocks is drawn. What is left open and stippled is neither: a surface lot, a plaza or a vacant parcel. The screened buildings are colored by the ramp above, the same one the district map uses, carry their score, and each is a link to its own page. Each casts a shadow as long as its measured height lets it, so towers stand out from the low buildings around them; the unscreened buildings have no measured height and cast none. 1840 15th St is outlined in its own score color at the outline it covers at ground level. Dashed inside it is the typical floor, the one the floor-plate figure below draws, because this building steps back as it rises. Its windowless core is hatched. The inset places it among every building the screen covers.

Typical floor plan: 87% of the building’s floor area sits within daylight reach of a facade; the drawing shows its typical floor, where the share is 89%. The shading is daylight, darkest at the windows and gone 35 ft in. The hatched area is windowless core: 7,463 sq ft per typical floor that must be renovated but can never be rented as an apartment. The dimension marks the deepest interior point, 58 ft from the nearest window. A–A is where the section beside it is cut.

Section A–A: cut across the depth of the plate, through the middle of the core. Daylight reaches 35 ft in from every facade, fading as it goes, and the hatched stripe left between the lit edges is floor that gets converted and can never be rented: 7,463 sq ft on the floor the screen scores, and 80,411 sq ft over 13 residential floors. The steps are where the building sets back as it rises. The shaded ground floor is converted like the rest and counted as no homes.

This is already an apartment building: Denver's property records list 285 apartments here. It is on the map because the city's building outlines file it as commercial, but this site does not count it as a conversion candidate.

Across its 13 residential floors this building carries 80,411 sq ft of windowless core — area that must be gutted, re-plumbed and sprinklered but can never be rented as an apartment.

Read with caution. This footprint carries 5 street addresses across 70,835 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 1840 15th St, 2026-09-19.

Suitability scoreStrong candidate	77 / 100
Storiesfrom 163 ft aerial-survey height ÷ 12 ft floor-to-floor	14
Height bandsfloor plate by floor range, from the city's roof outlines	Floors 1–2: 80,735 sq ft · Floors 3–5: 70,835 sq ft · Floors 6–7: 64,913 sq ft · Floor 8: 62,822 sq ft · Floor 9: 60,761 sq ft · Floor 10: 16,519 sq ft · Floors 11–12: 14,638 sq ft · Floors 13–14: 1,786 sq ft
Floor platetypical floor, from the city outlines	70,835 sq ft
Daylight efficiencyshare within 35 ft of a facade	87%
Deepest interior pointviability threshold is 80 ft	58 ft
Windowless coretypical floor; the building-wide total is in the text above	7,463 sq ft
BuiltDenver does not publish a construction year with this data	—
ZoningUnion Station	R-MU-30
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 2,402 ft of exterior wall, and across 13 residential floors the building carries 19,620 ft of it in total, divided among the 549 homes this screen estimates.

Its plate is highly articulated at 0.15: a long, notched or wing-shaped outline with far more facade than its area needs — wasteful as an office envelope, and close to ideal for apartments. How window line and plate shape are measured.

At the model’s 750 sq ft average, the plan works out at about 42.2 homes per floor. Its floors are not alike, though: the typical floor's deepest interior point is 58 ft from a facade, while its worst floor reaches 73 ft. The score follows the typical floor, so a podium that could not hold a bedroom does not by itself sink a slim tower above it — but it is there, and it is part of what would have to be drawn around.

Why 1840 15th St scores 77 out of 100

Daylight efficiency 93, Interior depth 55, Scale 100, Finance 42 — each out of 100, then weighted.

Score components for 1840 15th 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%	93	45%	41.9
Interior depthdeepest interior point 58 ft from a facade, scored from 80 ft down to 40 ft	55	25%	13.8
Scale549 estimated homes, scored from 0 up to 150	100	15%	15.0
Financeremaining gap is 35% of conversion cost, scored from 60% down to 0%	42	15%	6.3

Most of what it earns comes from daylight efficiency, and what holds it back most is finance, at 42 out of 100: remaining gap is 35% of conversion cost, scored from 60% down to 0%.

Other buildings screened near 1840 15th St

The 4 closest the screen also covers, from 310 ft away. They are the colored outlines on the plan at the top of this page.

1485 Delgany St
6 stories · 99% daylit · 35 estimated homes · scores 85/100 (Strong candidate)
about 310 ft away
1400 Wewatta St
11 stories · 73% daylit · 357 estimated homes · scores 61/100 (Worth a feasibility study)
about 370 ft away
1551 Wewatta St
13 stories · 71% daylit · 253 estimated homes · scores 60/100 (Worth a feasibility study)
about 390 ft away
1475 Delgany St
8 stories · 100% daylit · already a condominium building
about 450 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.