300 Park Ave
300 Park Ave is a 19-story building in Downtown San Jose with 60% of its floor area within daylight reach of a facade. This screen estimates 1,117 homes and scores it 35 out of 100 for office-to-residential conversion suitability.
CA-18 · Screened 2026-09-12 · Marginal
Also addressed as 333 W San Carlos St: San Jose’s address records place both on this one footprint.
Where 300 Park Ave is
Its block in Downtown San Jose, drawn from San Jose's own building outlines and street centerlines.
- Already housing
- Not screened
- 300 Park Ave
This building does not pencil at default assumptions, even with a modeled RESIDE Act grant.
Every floor carries 38,581 sq ft of windowless core — area that must be gutted, seismically braced and sprinklered but can never be rented as an apartment. Across 18 residential floors that is 694,460 sq ft of cost carrying no revenue.
Modeled conversion metrics for 300 Park Ave, 2026-09-12.
| Suitability scoreMarginal | 35 / 100 |
|---|---|
| Storiesfrom 231 ft LiDAR height ÷ 12 ft floor-to-floor | 19 |
| Floor plateper floor, from the city footprint | 96,810 sq ft |
| Daylight efficiencyshare within 35 ft of a facade | 60% |
| Deepest interior pointviability threshold is 80 ft | 106 ft |
| Windowless coreper floor — renovated but never rentable | 38,581 sq ft |
| Estimated homesat 750 sq ft average | 1,117 |
| Conversion cost$405/sq ft all-in on 1,742,580 sq ft | $705.7M |
| Gap before grantshortfall against completed value | $231.0M |
| 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
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 2,097 ft of exterior wall, and across 18 residential floors the building carries 37,747 ft of it in total, divided among the 1,117 homes this screen estimates.
Its plate is elongated at 0.28: 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 62.1 homes per floor, repeated on every residential floor, since this building's outline does not change as it rises.
Why 300 Park Ave scores 35 out of 100
The weighted components add to 40, but the score is capped at 35 because its deepest interior point is 106 ft from a facade, past the 80 ft threshold beyond which conversion requires carving a light well.
Score components for 300 Park Ave. Points are the subscore times its weight.
| Component | Subscore | Weight | Points |
|---|---|---|---|
| Daylight efficiency60% of the floor area within 35 ft of a facade, scored from 40% up to 90% | 40 | 45% | 18.1 |
| Interior depthdeepest interior point 106 ft from a facade, scored from 80 ft down to 40 ft | 0 | 25% | 0.0 |
| Scale1117 estimated homes, scored from 0 up to 150 | 100 | 15% | 15.0 |
| Financeremaining gap is 31% of conversion cost, scored from 60% down to 0% | 48 | 15% | 7.2 |
Most of what it earns comes from daylight efficiency, and what holds it back most is interior depth, at 0 out of 100: deepest interior point 106 ft from a facade, scored from 80 ft down to 40 ft.
What the conversion would cost
$405 per square foot all-in across 1,742,580 sq ft of converted floor, or $705.7M in total — about $632K for each of the 1,117 homes.
All-in cost per square foot for 300 Park Ave: 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 694,460 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 1,117 homes is $474.7M.
What would have to be true
A $231.0M gap before any grant, $221.0M after the modeled one. The smallest single change that would close it: average unit size 32% down.
The shortfall before any grant is $231.0M. Closing it from the value side means each of the 1,117 homes finishing at $632K rather than the $425K the model assumes — 49% more. Closing it from the cost side means getting all-in cost down from $405 to $272 per square foot.
A modeled RESIDE grant of $10.0M moves that threshold to $623K a home. That is still above the $425K assumed, leaving $221.0M uncovered, which is why the grant does not unlock this one.
Nor do all four levers have to move. For 300 Park Ave, one alone would close the gap at:
Single-assumption flip points for 300 Park Ave, each holding the other three at their defaults.
| Average unit sizethe binding constraint — the least this building would need | 32% downto 512 sq ft |
|---|---|
| Completed value per home | 47% upto $623K |
| Conversion cost per square foot | 49% downto $133/sq ft |
All four are sliders in the survey, where 300 Park Ave re-scores against your own numbers.
How it compares in Downtown San Jose
300 Park Ave ranks 59th of the 82 buildings screened here, against a median score of 64.
Its floor plate is better lit than 26% of them, and shallower than 13% of them at its deepest interior point. On size it is the 3rd largest by estimated homes. The full survey of all 82 buildings ranks and maps every one of them, and the list by address links each to its own page.
Its nearest match in size: 170 S Market St
The screened building closest to 300 Park Ave in converted floor area is 170 S Market St: 1,738,231 sq ft over 20 stories, against 1,742,580 sq ft over 19 here.
300 Park Ave scores 35 to its 20, and with the size held roughly equal most of that lead comes from daylight efficiency: 40 out of 100 here, 6 there (43% of the floor area within 35 ft of a facade, scored from 40% up to 90%). On the money they sit in the same place: each falls short even with the modeled grant. The two stand about 2,100 ft apart.
Would it qualify for a RESIDE Act grant?
The model awards 300 Park Ave $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 300 Park Ave
The 4 closest the screen also covers, from 730 ft away. They are the colored outlines on the plan at the top of this page.
- 303 Almaden Blvd13 stories · 59% daylit · 292 estimated homes · scores 35/100 (Marginal)about 730 ft away
- 151 Almaden Blvd22 stories · 39% daylit · 1,521 estimated homes · scores 16/100 (Unlikely)about 750 ft away
- 282 Almaden Blvd9 stories · 65% daylit · 201 estimated homes · scores 48/100 (Marginal)about 1,000 ft away
- 220 Almaden Blvd25 stories · 50% daylit · 776 estimated homes · scores 28/100 (Unlikely)about 1,010 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.