333 Market St
333 Market St is a 33-story building in Downtown San Francisco with 76% of its floor area within daylight reach of a facade. This screen estimates 508 homes and scores it 68 out of 100 for office-to-residential conversion suitability.
CA-11 · Screened 2026-10-12 · Worth a feasibility study
No address point in San Francisco’s records falls inside this footprint, so it is named by the closest one that no other screened building claims — usually a site entrance, but check the outline on the plan below before relying on the street number.
Where 333 Market St is
Its block in Downtown San Francisco, drawn from San Francisco's own building outlines and street centerlines.
- Already housing
- Not screened
- 333 Market St
This building does not pencil at default assumptions, even with a modeled RESIDE Act grant.
Every floor carries 4,649 sq ft of windowless core — area that must be gutted, seismically braced and sprinklered but can never be rented as an apartment. Across 32 residential floors that is 148,754 sq ft of cost carrying no revenue.
Modeled conversion metrics for 333 Market St, 2026-10-12.
| Suitability scoreWorth a feasibility study | 68 / 100 |
|---|---|
| Storiesfrom 445 ft LiDAR (2010) height ÷ 12 ft floor-to-floor | 33 |
| Floor plateper floor, from the city footprint | 19,542 sq ft |
| Daylight efficiencyshare within 35 ft of a facade | 76% |
| Deepest interior pointviability threshold is 80 ft | 62 ft |
| Windowless coreper floor — renovated but never rentable | 4,649 sq ft |
| Estimated homesat 750 sq ft average | 508 |
| Conversion cost$405/sq ft all-in on 625,357 sq ft | $253.3M |
| Gap before grantshortfall against completed value | $67.3M |
| Modeled RESIDE grantat the statutory per-award cap | $10.0M |
| BuiltSan Francisco's own record of the construction year | 1981 |
| ZoningFinancial District/South Beach | C-3-O(SD) |
| Opportunity Zonenot in a 2018 designated tract | No |
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 645 ft of exterior wall, and across 32 residential floors the building carries 20,644 ft of it in total, divided among the 508 homes this screen estimates.
Its plate is moderately compact at 0.59: 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 15.9 homes per floor, repeated on every residential floor, since this building's outline does not change as it rises.
Why 333 Market St scores 68 out of 100
Daylight efficiency 72, Interior depth 44, Scale 100, Finance 62 — each out of 100, then weighted.
Score components for 333 Market St. Points are the subscore times its weight.
| Component | Subscore | Weight | Points |
|---|---|---|---|
| Daylight efficiency76% of the floor area within 35 ft of a facade, scored from 40% up to 90% | 72 | 45% | 32.6 |
| Interior depthdeepest interior point 62 ft from a facade, scored from 80 ft down to 40 ft | 44 | 25% | 11.0 |
| Scale508 estimated homes, scored from 0 up to 150 | 100 | 15% | 15.0 |
| Financeremaining gap is 23% of conversion cost, scored from 60% down to 0% | 62 | 15% | 9.3 |
Most of what it earns comes from daylight efficiency, and what holds it back most is interior depth, at 44 out of 100: deepest interior point 62 ft from a facade, scored from 80 ft down to 40 ft.
Built in 1981
San Francisco records this building as going up in 1981, which puts it in the late-modern stock.
As a rule, typically the hardest to convert: the deepest plates of any era, large central cores, and floor-to-floor heights tight enough that running residential drainage under a ceiling can be the thing that ends a project. That is the era’s general tendency rather than a finding about this building — the model reads an outline and a height, and can see nothing inside — but it is the first thing an architect would want to know, and it colours how much confidence the 76% daylight figure above deserves.
What the conversion would cost
$405 per square foot all-in across 625,357 sq ft of converted floor, or $253.3M in total — about $499K for each of the 508 homes.
All-in cost per square foot for 333 Market 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 148,754 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 $366K a home, which for 508 homes is $185.9M.
What would have to be true
A $67.3M gap before any grant, $57.3M after the modeled one. The smallest single change that would close it: average unit size 24% down.
The shortfall before any grant is $67.3M. Closing it from the value side means each of the 508 homes finishing at $499K rather than the $366K the model assumes — 36% more. Closing it from the cost side means getting all-in cost down from $405 to $297 per square foot.
A modeled RESIDE grant of $10.0M moves that threshold to $479K a home. That is still above the $366K assumed, leaving $57.3M uncovered, which is why the grant does not unlock this one.
Nor do all four levers have to move. For 333 Market St, one alone would close the gap at:
Single-assumption flip points for 333 Market St, each holding the other three at their defaults.
| Average unit sizethe binding constraint — the least this building would need | 24% downto 573 sq ft |
|---|---|
| Completed value per home | 31% upto $479K |
| Conversion cost per square foot | 35% downto $168/sq ft |
All four are sliders in the survey, where 333 Market St re-scores against your own numbers.
How it compares in Downtown San Francisco
333 Market St ranks 154th of the 205 buildings screened here, against a median score of 87.
Its floor plate is better lit than 23% of them, and shallower than 25% of them at its deepest interior point. On size it is the 18th largest by estimated homes. The full survey of all 205 buildings ranks and maps every one of them, and the list by address links each to its own page.
Within Financial District/South Beach and the C-3-O(SD) zone
125th of 165 in Financial District/South Beach, 40th of 66 zoned C-3-O(SD) — the comparison that shares its rules, rents and streets.
San Francisco places 165 of the screened buildings in Financial District/South Beach. 333 Market St ranks 125th of them against a median score of 88. 121 score 70 or more, their median deepest interior point is 47 ft from a facade against this building’s 62 ft, and together they would hold an estimated 40,456 homes. The group’s top scorer is 870 Market St, at 100.
66 of the screened buildings are zoned C-3-O(SD). 333 Market St ranks 40th of them against a median score of 72. 37 score 70 or more, their median deepest interior point is 59 ft from a facade against this building’s 62 ft, and together they would hold an estimated 18,546 homes. The group’s top scorer is 140 New Montgomery St, at 100.
Its nearest match in size: 45 Fremont St
The screened building closest to 333 Market St in converted floor area is 45 Fremont St: 627,822 sq ft over 34 stories, against 625,357 sq ft over 33 here.
The two land within a few points of each other — 68 here, 69 there — so at this size the screen reads them as much the same prospect. 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 Market 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.
It does not sit in a 2018 designated Opportunity Zone, so it would not draw that Section 201 priority.
Other buildings screened near 333 Market St
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.
- 45 Fremont St34 stories · 76% daylit · 511 estimated homes · scores 69/100 (Worth a feasibility study)about 260 ft away
- 425 Market St38 stories · 68% daylit · 749 estimated homes · scores 55/100 (Worth a feasibility study)about 350 ft away
- 50 Beale St24 stories · 69% daylit · 496 estimated homes · scores 59/100 (Worth a feasibility study)about 370 ft away
- 101 California St48 stories · 80% daylit · 1,787 estimated homes · scores 35/100 (Marginal)about 400 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.