1250 Welton St

1250 Welton St is a 5-story building in Greater Downtown Denver with 99% of its floor area within daylight reach of a facade. This screen estimates 133 homes and scores it 94 out of 100 for office-to-residential conversion suitability.

CO-1 · Screened 2026-10-04 · Strong candidate

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Where 1250 Welton 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
1250 Welton St

1250 Welton 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. 1250 Welton 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: 99% of the building’s floor area sits within daylight reach of a facade; the drawing shows its typical floor, where the share is 99%. The shading is daylight, darkest at the windows and gone 35 ft in. The hatched area is windowless core: 337 sq ft per typical floor that must be renovated but can never be rented as an apartment. The dimension marks the deepest interior point, 41 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: 337 sq ft on the floor the screen scores, and 1,519 sq ft over 4 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 building does not pencil at default assumptions, even with a modeled RESIDE Act grant.

Across its 4 residential floors this building carries 1,519 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 1250 Welton St, 2026-10-04.

Suitability scoreStrong candidate	94 / 100
Storiesfrom 61 ft aerial-survey height ÷ 12 ft floor-to-floor	5
Height bandsfloor plate by floor range, from the city's roof outlines	Floor 1: 35,324 sq ft · Floor 2: 34,427 sq ft · Floors 3–4: 33,173 sq ft · Floor 5: 25,650 sq ft
Floor platetypical floor, from the city outlines	33,173 sq ft
Daylight efficiencyshare within 35 ft of a facade	99%
Deepest interior pointviability threshold is 80 ft	41 ft
Windowless coretypical floor; the building-wide total is in the text above	337 sq ft
Estimated homesat 750 sq ft average	133
Conversion cost$360/sq ft all-in on 126,422 sq ft	$45.5M
Gap before grantshortfall against completed value	$14.1M
Modeled RESIDE grantbelow the statutory cap	$8.0M
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

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

The typical floor has 1,165 ft of exterior wall, and across 4 residential floors the building carries 4,477 ft of it in total, divided among the 133 homes this screen estimates.

Its plate is elongated at 0.31: 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 33.3 homes per floor. Its floors are not alike, though: the typical floor's deepest interior point is 41 ft from a facade, while its worst floor reaches 46 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 1250 Welton St scores 94 out of 100

Daylight efficiency 100, Interior depth 98, Scale 89, Finance 78 — each out of 100, then weighted.

Score components for 1250 Welton St. Points are the subscore times its weight.

Component	Subscore	Weight	Points
Daylight efficiency99% of the floor area within 35 ft of a facade, scored from 40% up to 90%	100	45%	45.0
Interior depthdeepest interior point 41 ft from a facade, scored from 80 ft down to 40 ft	98	25%	24.5
Scale133 estimated homes, scored from 0 up to 150	89	15%	13.3
Financeremaining gap is 13% of conversion cost, scored from 60% down to 0%	78	15%	11.6

Most of what it earns comes from daylight efficiency, and what holds it back most is finance, at 78 out of 100: remaining gap is 13% of conversion cost, scored from 60% down to 0%.

What the conversion would cost

$360 per square foot all-in across 126,422 sq ft of converted floor, or $45.5M in total — about $342K for each of the 133 homes.

All-in cost per square foot for 1250 Welton 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 1,519 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 133 homes is $31.4M.

What would have to be true

A $14.1M gap before any grant, $6.1M after the modeled one. The smallest single change that would close it: average unit size 13% down.

The shortfall before any grant is $14.1M. Closing it from the value side means each of the 133 homes finishing at $342K rather than the $236K the model assumes — 45% more. Closing it from the cost side means getting all-in cost down from $360 to $248 per square foot.

A modeled RESIDE grant of $8.0M moves that threshold to $282K a home. That is still above the $236K assumed, leaving $6.1M uncovered, which is why the grant does not unlock this one.

Nor do all four levers have to move. For 1250 Welton St, one alone would close the gap at:

Single-assumption flip points for 1250 Welton St, each holding the other three at their defaults.

Average unit sizethe binding constraint — the least this building would need	13% downto 649 sq ft
Circulation efficiency	16% upto 92%
Conversion cost per square foot	19% downto $211/sq ft
Completed value per home	20% upto $282K

All four are sliders in the survey, where 1250 Welton St re-scores against your own numbers.

How it compares in Greater Downtown Denver

1250 Welton St ranks 10th of the 208 buildings screened here, against a median score of 73.

Its floor plate is better lit than 90% of them, and shallower than 83% of them at its deepest interior point. On size it is the 142nd largest by estimated homes. The full survey of all 208 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

4th of 74 in CBD, 2nd of 70 zoned D-C — the comparison that shares its rules, rents and streets.

Denver places 74 of the screened buildings in CBD. 1250 Welton St ranks 4th of them against a median score of 71. 38 score 70 or more, their median deepest interior point is 57 ft from a facade against this building’s 41 ft, and together they would hold an estimated 33,455 homes. The group’s top scorer is 918 17th St, at 97.

70 of the screened buildings are zoned D-C. 1250 Welton St ranks 2nd of them against a median score of 72. 36 score 70 or more, their median deepest interior point is 58 ft from a facade against this building’s 41 ft, and together they would hold an estimated 32,185 homes. The group’s top scorer is 721 19th St, at 95.

Its nearest match in size: 1317 14th St

The screened building closest to 1250 Welton St in converted floor area is 1317 14th St: 128,676 sq ft over 5 stories, against 126,422 sq ft over 5 here.

1250 Welton St scores 94 to its 69, and with the size held roughly equal most of that lead comes from interior depth: 98 out of 100 here, 41 there (deepest interior point 64 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 2,800 ft apart.

Would it qualify for a RESIDE Act grant?

The model awards 1250 Welton St $8.0M, 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 1250 Welton St

The 4 closest the screen also covers, from 520 ft away. They are the colored outlines on the plan at the top of this page.

1325 Glenarm Pl
7 stories · 75% daylit · 177 estimated homes · scores 63/100 (Worth a feasibility study)
about 520 ft away
700 14th St
10 stories · 20% daylit · 1,710 estimated homes · scores 15/100 (Unlikely)
about 610 ft away
520 W Colfax Ave
9 stories · 65% daylit · 276 estimated homes · scores 49/100 (Marginal)
about 670 ft away
440 14th St
19 stories · 92% daylit · 254 estimated homes · scores 94/100 (Strong candidate)
about 710 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.