121 S Market St
121 S Market St is a 12-story building in Downtown San José with 89% of its floor area within daylight reach of a facade. This screen estimates 115 homes and scores it 88 out of 100 for office-to-residential conversion suitability.
CA-16 · Screened 2026-09-12 · Strong candidate
This building does not pencil on its own, but a modeled RESIDE Act grant closes the gap.
Every floor carries 1,261 sq ft of windowless core — area that must be gutted, seismically braced and sprinklered but can never be rented as an apartment. Across 11 residential floors that is 13,866 sq ft of cost carrying no revenue.
| Suitability scoreStrong candidate | 88 / 100 |
|---|---|
| Storiesfrom 142 ft LiDAR height ÷ 12 ft floor-to-floor | 12 |
| Floor plateper floor, from the city footprint | 11,131 sq ft |
| Daylight efficiencyshare within 35 ft of a facade | 89% |
| Deepest interior pointviability threshold is 80 ft | 52 ft |
| Windowless coreper floor — renovated but never rentable | 1,261 sq ft |
| Estimated homesat 750 sq ft average | 115 |
| Conversion cost$405/sq ft all-in on 122,443 sq ft | $49.6M |
| Gap before grantshortfall against completed value | $715K |
| Modeled RESIDE grantbelow the statutory cap | $6.9M |
| ZoningDowntown | DC |
These figures are a screen, not a feasibility study, and they come from public footprint and height data rather than from plans. See how this was computed and what it cannot tell you, or open this building in the interactive survey to change the assumptions behind it.