333 W San Carlos St
333 W San Carlos St is a 16-story building in Downtown San Jose with 77% of its floor area within daylight reach of a facade. This screen estimates 240 homes and scores it 68 out of 100 for office-to-residential conversion suitability.
CA-18 · Screened 2026-10-20 · Worth a feasibility study
Where 333 W San Carlos St is
Its block in Downtown San Jose, drawn from San Jose's own building outlines and street centerlines.
- Already housing
- Not screened
- 333 W San Carlos St
This building does not pencil at default assumptions, even with a modeled RESIDE Act grant.
Every floor carries 4,551 sq ft of windowless core — area that must be gutted, seismically braced and sprinklered but can never be rented as an apartment. Across 15 residential floors that is 68,271 sq ft of cost carrying no revenue.
Separated from its neighbors. The city’s map draws this building and the ones beside it as one outline with one height. This outline comes from OpenStreetMap, which maps them separately, and its floor count is OpenStreetMap’s.
Modeled conversion metrics for 333 W San Carlos St, 2026-10-20.
| Suitability scoreWorth a feasibility study | 68 / 100 |
|---|---|
| Storiesfrom OpenStreetMap, “Riverpark Tower I, way 39244225”, in place of the 192 ft LiDAR height ÷ 12 ft floor-to-floor | 16 |
| Floor plateper floor, from the city footprint | 19,595 sq ft |
| Daylight efficiencyshare within 35 ft of a facade | 77% |
| Deepest interior pointviability threshold is 80 ft | 71 ft |
| Windowless coreper floor — renovated but never rentable | 4,551 sq ft |
| Estimated homesat 750 sq ft average | 240 |
| Conversion cost$405/sq ft all-in on 293,932 sq ft | $119.0M |
| Gap before grantshortfall against completed value | $17.0M |
| Modeled RESIDE grantat the statutory per-award cap | $10.0M |
| BuiltSan Jose does not publish a construction year with this data | — |
| ZoningDowntown San Jose | CG(PD) |
| Opportunity Zonecensus tract 06085500800, 2018 designation | Yes |
The plan: window line, shape and floor rhythm
41 ft of exterior wall for each home the screen estimates — enough for two- and three-bedroom homes across the plan.
The typical floor has 655 ft of exterior wall, and across 15 residential floors the building carries 9,819 ft of it in total, divided among the 240 homes this screen estimates.
Its plate is moderately compact at 0.57: a squarish plan, with enough perimeter for a conventional double-loaded corridor. How window line and plate shape are measured.
At the model’s 750 sq ft average, the plan works out at about 16.0 homes per floor, repeated on every residential floor, since this building's outline does not change as it rises.
Why 333 W San Carlos St scores 68 out of 100
Daylight efficiency 74, Interior depth 24, Scale 100, Finance 90 — each out of 100, then weighted.
Score components for 333 W San Carlos St. Points are the subscore times its weight.
| Component | Subscore | Weight | Points |
|---|---|---|---|
| Daylight efficiency77% of the floor area within 35 ft of a facade, scored from 40% up to 90% | 74 | 45% | 33.1 |
| Interior depthdeepest interior point 71 ft from a facade, scored from 80 ft down to 40 ft | 24 | 25% | 5.9 |
| Scale240 estimated homes, scored from 0 up to 150 | 100 | 15% | 15.0 |
| Financeremaining gap is 6% of conversion cost, scored from 60% down to 0% | 90 | 15% | 13.5 |
Most of what it earns comes from daylight efficiency, and what holds it back most is interior depth, at 24 out of 100: deepest interior point 71 ft from a facade, scored from 80 ft down to 40 ft.
What the conversion would cost
$405 per square foot all-in across 293,932 sq ft of converted floor, or $119.0M in total — about $496K for each of the 240 homes.
All-in cost per square foot for 333 W San Carlos St: base cost plus the code work a change of use triggers.
| Base conversion cost | $260/sq ft |
|---|---|
| Seismic retrofit (change of use) | $45/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 | $405/sq ft |
That cost is charged across every converted square foot, including the 68,271 sq ft of windowless core, which has to be gutted, seismically braced and sprinklered like the rest of the building and then earns nothing. Against it the model sets a completed value of $425K a home, which for 240 homes is $102.0M.
What would have to be true
A $17.0M gap before any grant, $7.0M after the modeled one. The smallest single change that would close it: average unit size 6% down.
The shortfall before any grant is $17.0M. Closing it from the value side means each of the 240 homes finishing at $496K rather than the $425K the model assumes — 17% more. Closing it from the cost side means getting all-in cost down from $405 to $347 per square foot.
A modeled RESIDE grant of $10.0M moves that threshold to $454K a home. That is still above the $425K assumed, leaving $7.0M uncovered, which is why the grant does not unlock this one.
Nor do all four levers have to move. For 333 W San Carlos St, one alone would close the gap at:
Single-assumption flip points for 333 W San Carlos St, each holding the other three at their defaults.
| Average unit sizethe binding constraint — the least this building would need | 6% downto 702 sq ft |
|---|---|
| Circulation efficiency | 7% upto 85% |
| Completed value per home | 7% upto $454K |
| Conversion cost per square foot | 9% downto $236/sq ft |
All four are sliders in the survey, where 333 W San Carlos St re-scores against your own numbers.
How it compares in Downtown San Jose
333 W San Carlos St ranks 29th of the 47 buildings screened here, against a median score of 77.
Its floor plate is better lit than 45% of them, and shallower than 30% of them at its deepest interior point. On size it is the 13th largest by estimated homes. The full survey of all 47 buildings ranks and maps every one of them, and the list by address links each to its own page.
Its nearest match in size: 300 Park Ave
The screened building closest to 333 W San Carlos St in converted floor area is 300 Park Ave: 294,771 sq ft over 16 stories, against 293,932 sq ft over 16 here.
333 W San Carlos St scores 68 to its 72, and with the size held roughly equal most of that shortfall comes from interior depth: 24 out of 100 here, 32 there (deepest interior point 67 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 300 ft apart.
Would it qualify for a RESIDE Act grant?
The model awards 333 W San Carlos 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.
This building does sit in census tract 06085500800, a 2018 designated Opportunity Zone, which Section 201 lets HUD favor — one of the few statutory priorities this screen can actually check.
Other buildings screened near 333 W San Carlos St
The 4 closest the screen also covers, from 330 ft away. They are the colored outlines on the plan at the top of this page.
- 300 Park Ave16 stories · 78% daylit · 246 estimated homes · scores 72/100 (Strong candidate)about 330 ft away
- 303 Almaden Blvd11 stories · 59% daylit · 243 estimated homes · scores 35/100 (Marginal)about 550 ft away
- 151 Almaden Blvd22 stories · 39% daylit · 1,521 estimated homes · scores 16/100 (Unlikely)about 770 ft away
- 282 Almaden Blvd9 stories · 65% daylit · 201 estimated homes · scores 48/100 (Marginal)about 850 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.