1801 Arapahoe St

1801 Arapahoe St is a 11-story apartment building in Greater Downtown Denver. Its floor plate has 100% of its area within daylight reach of a facade and scores 92 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

No address point in Denver’s records falls inside this footprint, so it is named by the closest one that no other screened building claims — usually a site entrance, but check the outline on the plan below before relying on the street number.

Where 1801 Arapahoe 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
1801 Arapahoe St

1801 Arapahoe 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. 1801 Arapahoe 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. The inset places it among every building the screen covers.

Typical floor plan: 100% of the building’s floor area sits within daylight reach of a facade; the drawing shows its typical floor, where the share is 100%, with no dead core at all. The shading is daylight, darkest at the windows and gone 35 ft in. The dimension marks the deepest interior point, 29 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, and here it meets in the middle: the plate is thin enough that no floor is left windowless. 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 144 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.

This footprint has no windowless core at all: every point on the floor plate is within 35 ft of a facade, which is unusual and is the main reason it scores as well as it does.

Modeled conversion metrics for 1801 Arapahoe St, 2026-09-19.

Suitability scoreStrong candidate	92 / 100
Storiesfrom 135 ft aerial-survey height ÷ 12 ft floor-to-floor	11
Height bandsfloor plate by floor range, from the city's roof outlines	Floor 1: 11,618 sq ft · Floors 2–10: 10,293 sq ft · Floor 11: 1,434 sq ft
Floor platetypical floor, from the city outlines	10,293 sq ft
Daylight efficiencyshare within 35 ft of a facade	100%
Deepest interior pointviability threshold is 80 ft	29 ft
Windowless coretypical floor; the building-wide total is in the text above	0 sq ft
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

57 ft of exterior wall for each home the screen estimates — enough for two- and three-bedroom homes across the plan.

The typical floor has 616 ft of exterior wall, and across 10 residential floors the building carries 5,714 ft of it in total, divided among the 100 homes this screen estimates.

Its plate is elongated at 0.34: 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 10.0 homes per floor, repeated on every residential floor, since this building's outline does not change as it rises.

Why 1801 Arapahoe St scores 92 out of 100

Daylight efficiency 100, Interior depth 100, Scale 67, Finance 79 — each out of 100, then weighted.

Score components for 1801 Arapahoe St. Points are the subscore times its weight.

Component	Subscore	Weight	Points
Daylight efficiency100% of the floor area within 35 ft of a facade, scored from 40% up to 90%	100	45%	45.0
Interior depthdeepest interior point 29 ft from a facade, scored from 80 ft down to 40 ft	100	25%	25.0
Scale100 estimated homes, scored from 0 up to 150	67	15%	10.0
Financeremaining gap is 13% of conversion cost, scored from 60% down to 0%	79	15%	11.9

Most of what it earns comes from daylight efficiency, and what holds it back most is scale, at 67 out of 100: 100 estimated homes, scored from 0 up to 150.

Other buildings screened near 1801 Arapahoe St

The 4 closest the screen also covers, from 180 ft away. They are the colored outlines on the plan at the top of this page.

1141 18th St
7 stories · 88% daylit · already a condominium building
about 180 ft away
1099 18th St
36 stories · 78% daylit · 589 estimated homes · scores 66/100 (Worth a feasibility study)
about 270 ft away
1825 Lawrence St
18 stories · 83% daylit · 233 estimated homes · scores 76/100 (Strong candidate)
about 390 ft away
1001 17th St
27 stories · 62% daylit · 609 estimated homes · scores 35/100 (Marginal)
about 480 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.