151 Almaden Blvd
151 Almaden Blvd is a 22-story building in Downtown San Jose with 39% of its floor area within daylight reach of a facade. This screen estimates 1,521 homes and scores it 16 out of 100 for office-to-residential conversion suitability.
CA-18 · Screened 2026-09-12 · Unlikely
Also addressed as 321 Park Ave and 345 Park Ave: San Jose’s address records place all 3 on this one footprint.
Where 151 Almaden Blvd is
Its block in Downtown San Jose, drawn from San Jose's own building outlines and street centerlines.
- Already housing
- Not screened
- 151 Almaden Blvd
This building does not pencil at default assumptions, even with a modeled RESIDE Act grant.
Every floor carries 105,444 sq ft of windowless core — area that must be gutted, seismically braced and sprinklered but can never be rented as an apartment. Across 21 residential floors that is 2,214,316 sq ft of cost carrying no revenue.
Modeled conversion metrics for 151 Almaden Blvd, 2026-09-12.
| Suitability scoreUnlikely | 16 / 100 |
|---|---|
| Storiesfrom 260 ft LiDAR height ÷ 12 ft floor-to-floor | 22 |
| Floor plateper floor, from the city footprint | 173,390 sq ft |
| Daylight efficiencyshare within 35 ft of a facade | 39% |
| Deepest interior pointviability threshold is 80 ft | 168 ft |
| Windowless coreper floor — renovated but never rentable | 105,444 sq ft |
| Estimated homesat 750 sq ft average | 1,521 |
| Conversion cost$405/sq ft all-in on 3,641,188 sq ft | $1.47B |
| Gap before grantshortfall against completed value | $828.3M |
| Modeled RESIDE grantat the statutory per-award cap | $10.0M |
| BuiltSan Jose does not publish a construction year with this data | — |
| ZoningDowntown San Jose | DC |
| Opportunity Zonecensus tract 06085500800, 2018 designation | Yes |
The plan: window line, shape and floor rhythm
35 ft of exterior wall for each home the screen estimates — enough for two- and three-bedroom homes across the plan.
The typical floor has 2,564 ft of exterior wall, and across 21 residential floors the building carries 53,846 ft of it in total, divided among the 1,521 homes this screen estimates.
Its plate is elongated at 0.33: 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 72.4 homes per floor, repeated on every residential floor, since this building's outline does not change as it rises.
Why 151 Almaden Blvd scores 16 out of 100
Daylight efficiency 0, Interior depth 0, Scale 100, Finance 8 — each out of 100, then weighted.
Score components for 151 Almaden Blvd. Points are the subscore times its weight.
| Component | Subscore | Weight | Points |
|---|---|---|---|
| Daylight efficiency39% of the floor area within 35 ft of a facade, scored from 40% up to 90% | 0 | 45% | 0.0 |
| Interior depthdeepest interior point 168 ft from a facade, scored from 80 ft down to 40 ft | 0 | 25% | 0.0 |
| Scale1521 estimated homes, scored from 0 up to 150 | 100 | 15% | 15.0 |
| Financeremaining gap is 55% of conversion cost, scored from 60% down to 0% | 8 | 15% | 1.1 |
Most of what it earns comes from scale, and what holds it back most is daylight efficiency, at 0 out of 100: 39% of the floor area within 35 ft of a facade, scored from 40% up to 90%.
What the conversion would cost
$405 per square foot all-in across 3,641,188 sq ft of converted floor, or $1.47B in total — about $970K for each of the 1,521 homes.
All-in cost per square foot for 151 Almaden Blvd: 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 2,214,316 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 1,521 homes is $646.4M.
What would have to be true
A $828.3M gap before any grant, $818.3M after the modeled one. The smallest single change that would close it: average unit size 56% down.
The shortfall before any grant is $828.3M. Closing it from the value side means each of the 1,521 homes finishing at $970K rather than the $425K the model assumes — 128% more. Closing it from the cost side means getting all-in cost down from $405 to $178 per square foot.
A modeled RESIDE grant of $10.0M moves that threshold to $963K a home. That is still above the $425K assumed, leaving $818.3M uncovered, which is why the grant does not unlock this one.
Nor do all four levers have to move. For 151 Almaden Blvd, one alone would close the gap at:
Single-assumption flip points for 151 Almaden Blvd, each holding the other three at their defaults.
| Average unit sizethe binding constraint — the least this building would need | 56% downto 331 sq ft |
|---|---|
| Conversion cost per square foot | 86% downto $35/sq ft |
| Completed value per home | 127% upto $963K |
All four are sliders in the survey, where 151 Almaden Blvd re-scores against your own numbers.
How it compares in Downtown San Jose
151 Almaden Blvd ranks 82nd of the 82 buildings screened here, against a median score of 64.
Its floor plate is better lit than 1% of them, and shallower than 1% of them at its deepest interior point. On size it is the 2nd 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.
Within the DC zone
72nd of 72 zoned DC — the comparison that shares its rules, rents and streets.
72 of the screened buildings are zoned DC. 151 Almaden Blvd ranks 72nd of them against a median score of 61. 31 score 70 or more, their median deepest interior point is 68 ft from a facade against this building’s 168 ft, and together they would hold an estimated 23,276 homes. The group’s top scorer is 1 Almaden Blvd, at 100.
Its nearest match in size: 301 S 1st St
The screened building closest to 151 Almaden Blvd in converted floor area is 301 S 1st St: 3,194,693 sq ft over 22 stories, against 3,641,188 sq ft over 22 here.
151 Almaden Blvd scores 16 to its 23, and with the size held roughly equal most of that shortfall comes from daylight efficiency: 0 out of 100 here, 11 there (45% 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 2,000 ft apart.
Would it qualify for a RESIDE Act grant?
The model awards 151 Almaden Blvd $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 151 Almaden Blvd
The 4 closest the screen also covers, from 260 ft away. They are the colored outlines on the plan at the top of this page.
- 111 Almaden Blvd11 stories · 82% daylit · 159 estimated homes · scores 80/100 (Strong candidate)about 260 ft away
- 99 Almaden Blvd13 stories · 98% daylit · 156 estimated homes · scores 100/100 (Strong candidate)about 530 ft away
- 150 Almaden Blvd19 stories · 83% daylit · 228 estimated homes · scores 81/100 (Strong candidate)about 540 ft away
- 333 W San Fernando St21 stories · 46% daylit · 800 estimated homes · scores 23/100 (Unlikely)about 550 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.