210 N 4th St
210 N 4th St is a 6-story building in Downtown San Jose with 85% of its floor area within daylight reach of a facade. This screen estimates 60 homes and scores it 77 out of 100 for office-to-residential conversion suitability.
CA-18 · Screened 2026-10-20 · Strong candidate
Also addressed as 222 N 4th St: San Jose’s address records place both on this one footprint.
Where 210 N 4th St is
Its block in Downtown San Jose, drawn from San Jose's own building outlines and street centerlines.
- Already housing
- Not screened
- 210 N 4th St
This building does not pencil on its own, but a modeled RESIDE Act grant would close the gap if the building qualified for one.
Every floor carries 2,049 sq ft of windowless core — area that must be gutted, seismically braced and sprinklered but can never be rented as an apartment. Across 5 residential floors that is 10,247 sq ft of cost carrying no revenue.
Modeled conversion metrics for 210 N 4th St, 2026-10-20.
| Suitability scoreStrong candidate | 77 / 100 |
|---|---|
| Storiesfrom 67 ft LiDAR height ÷ 12 ft floor-to-floor | 6 |
| Floor plateper floor, from the city footprint | 13,461 sq ft |
| Daylight efficiencyshare within 35 ft of a facade | 85% |
| Deepest interior pointviability threshold is 80 ft | 55 ft |
| Windowless coreper floor — renovated but never rentable | 2,049 sq ft |
| Estimated homesat 750 sq ft average | 60 |
| Conversion cost$405/sq ft all-in on 67,305 sq ft | $27.3M |
| Gap before grantshortfall against completed value | $1.8M |
| Modeled RESIDE grantbelow the statutory cap | $3.6M |
| BuiltSan Jose does not publish a construction year with this data | — |
| ZoningDowntown San Jose | CG |
| Opportunity Zonecensus tract 06085501000, 2018 designation | Yes |
The plan: window line, shape and floor rhythm
39 ft of exterior wall for each home the screen estimates — enough for two- and three-bedroom homes across the plan.
The typical floor has 474 ft of exterior wall, and across 5 residential floors the building carries 2,369 ft of it in total, divided among the 60 homes this screen estimates.
Its plate is compact at 0.75: close to a square or a circle, the most efficient envelope an office can have and the least generous one for apartments: little perimeter to divide among homes. How window line and plate shape are measured.
At the model’s 750 sq ft average, the plan works out at about 12.0 homes per floor, repeated on every residential floor, since this building's outline does not change as it rises.
Why 210 N 4th St scores 77 out of 100
Daylight efficiency 90, Interior depth 62, Scale 40, Finance 100 — each out of 100, then weighted.
Score components for 210 N 4th St. Points are the subscore times its weight.
| Component | Subscore | Weight | Points |
|---|---|---|---|
| Daylight efficiency85% of the floor area within 35 ft of a facade, scored from 40% up to 90% | 90 | 45% | 40.3 |
| Interior depthdeepest interior point 55 ft from a facade, scored from 80 ft down to 40 ft | 62 | 25% | 15.6 |
| Scale60 estimated homes, scored from 0 up to 150 | 40 | 15% | 6.0 |
| Financecompleted value covers conversion cost with 7% to spare, which tops out the component | 100 | 15% | 15.0 |
Most of what it earns comes from daylight efficiency, and what holds it back most is scale, at 40 out of 100: 60 estimated homes, scored from 0 up to 150.
What the conversion would cost
$405 per square foot all-in across 67,305 sq ft of converted floor, or $27.3M in total — about $454K for each of the 60 homes.
All-in cost per square foot for 210 N 4th 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 10,247 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 60 homes is $25.5M.
What would have to be true
A $1.8M gap before any grant, which the modeled $3.6M closes. What would reopen it soonest: circulation efficiency 6% down.
The shortfall before any grant is $1.8M. Closing it from the value side means each of the 60 homes finishing at $454K rather than the $425K the model assumes — 7% more. Closing it from the cost side means getting all-in cost down from $405 to $379 per square foot.
A modeled RESIDE grant of $3.6M moves that threshold to $394K a home. That is below the assumed value, which is why this building counts as penciling with the grant, at market rents — subject to it qualifying under the law's vacant-and-abandoned test, which this data cannot show.
Each of these, moved on its own, would be enough to undo that for 210 N 4th St:
Single-assumption flip points for 210 N 4th St, each holding the other three at their defaults.
| Circulation efficiencythe binding constraint — the least this building would need | 6% downto 75% |
|---|---|
| Average unit size | 7% upto 801 sq ft |
| Completed value per home | 7% downto $394K |
| Conversion cost per square foot | 11% upto $287/sq ft |
All four are sliders in the survey, where 210 N 4th St re-scores against your own numbers.
How it compares in Downtown San Jose
210 N 4th St ranks 23rd of the 47 buildings screened here, against a median score of 77.
Its floor plate is better lit than 70% of them, and shallower than 62% of them at its deepest interior point. On size it is the 39th 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: 96 N 3rd St
The screened building closest to 210 N 4th St in converted floor area is 96 N 3rd St: 63,082 sq ft over 6 stories, against 67,305 sq ft over 6 here.
The two land within a few points of each other — 77 here, 78 there — so at this size the screen reads them as much the same prospect. On the money they sit in the same place: each pencils only with the modeled RESIDE grant. The two stand about 900 ft apart.
Would it qualify for a RESIDE Act grant?
The model awards 210 N 4th St $3.6M, 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 06085501000, 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 210 N 4th St
The 4 closest the screen also covers, from 400 ft away. They are the colored outlines on the plan at the top of this page.
- 196 N 3rd St6 stories · 79% daylit · 73 estimated homes · scores 69/100 (Worth a feasibility study)about 400 ft away
- 160 N 3rd St5 stories · 100% daylit · 33 estimated homes · scores 88/100 (Strong candidate)about 470 ft away
- 152 N 3rd St9 stories · 79% daylit · 177 estimated homes · scores 81/100 (Strong candidate)about 510 ft away
- 97 E St James St5 stories · 90% daylit · already a condominium buildingabout 540 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.