Home › Castro/Upper Market › 21st St
3870 21st St
Condo, 2 bd, 2 ba, 1,338 sqft, built 1928
34 sales inside 0.35 mi since May 2025. Click a sale on the map, or untick it below, to leave it out.
Drag the circle or this strip to change the searchEstimated sale price today
Medium confidence
$1,786,000
$1,375,000estimated range$2,197,000
From 33 comps at a weighted median of $1,335 per sqft.
- Block
- 3603
- Lot
- 112
- Sales
- Nov 2025 to Oct 2026
- Prices adjusted to
- 2026-11-02
- Within
- 0.35 mi
- Sold since
- May 2025
Sale prices versus asking
Similarity-weighted median: 19.4% above final asking.
Middle half: 5.8% above asking to 24.8% above asking. 23 of 33 selected comps have a verified final asking price.
Comparable sales (34)
Every sale inside the circle starts ticked, most similar first. Untick one here, or click it on the map, to leave it out.
| Address | Sold | Price | Final asking | Sale vs. asking | Adj. today | $/sqft | Size | Dist. | Why | |
|---|---|---|---|---|---|---|---|---|---|---|
| 189 Collingwood St | 2026-07-22 | $1.67M | No asking price | — | $1.76M | $1,335 | 2bd 2ba 1,321sf | 0.23 mi | similar size, 2 bd | |
| 3868 21st St | 2026-03-11 | $1.67M | $1,395,000 | $270,000 above asking (19.4%) | $1.72M | $1,322 | 3bd 2ba 1,301sf | <0.05 mi | nearby on same street, similar size | |
| 125 Eureka St | 2026-10-19 | $2.12M | $1,695,000 | $420,000 above asking (24.8%) | $2.06M | $1,524 | 2bd 2ba 1,350sf | 0.34 mi | similar size, 2 bd, recent | |
| 4052 18th St | 2026-06-24 | $1.43M | No asking price | — | $1.48M | $1,088 | 2bd 3ba 1,364sf | 0.33 mi | similar size, 2 bd | |
| 3822 22nd St | 2026-06-09 | $2.5M | $1,795,000 | $705,000 above asking (39.3%) | $2.6M | $2,192 | 2bd 2ba 1,188sf | 0.12 mi | 2 bd | |
| 728 Castro St | 2026-04-22 | $1.6M | $1,325,000 | $275,500 above asking (20.8%) | $1.62M | $1,375 | 2bd 2ba 1,177sf | 0.06 mi | 2 bd | |
| 432 Elizabeth St | 2026-10-19 | $1.65M | $1,095,000 | $555,000 above asking (50.7%) | $1.61M | $1,371 | 2bd 1ba 1,171sf | 0.33 mi | 2 bd, recent | |
| 150 Eureka St #101 | 2026-04-14 | $720K | No asking price | — | $728K | — | 2bd 2ba | 0.35 mi | 2 bd, no size on record | |
| 627 Castro St | 2026-10-14 | $2.34M | $1,995,000 | $345,000 above asking (17.3%) | $2.28M | $1,380 | 3bd 2ba 1,650sf | 0.18 mi | recent | |
| 618 Sanchez St | 2026-07-17 | $2.3M | $2,399,000 | $99,000 below asking (4.1%) | $2.43M | $1,838 | 2bd 3ba 1,320sf | 0.26 mi | similar size, 2 bd | |
| 615 Noe St #2 | 2026-06-23 | $1.4M | $1,400,000 | At asking | $1.46M | $1,301 | 2bd 1ba 1,121sf | 0.21 mi | 2 bd | |
| 671 Alvarado St | 2026-03-27 | $1.68M | $1,395,000 | $280,000 above asking (20.1%) | $1.73M | $1,343 | 2bd 2ba 1,288sf | 0.22 mi | similar size, 2 bd | |
| 4416 19th St | 2026-03-13 | $1.9M | $1,795,000 | $105,000 above asking (5.8%) | $1.96M | $1,328 | 2bd 2ba 1,478sf | 0.32 mi | similar size, 2 bd | |
| 317 Douglass St | 2026-02-03 | $1.17M | No asking price | — | $1.25M | $954 | 3bd 1ba 1,309sf | 0.32 mi | similar size | |
| 582 Douglass St | 2026-09-17 | $1.3M | $995,000 | $305,000 above asking (30.7%) | $1.3M | $1,258 | 1bd 1ba 1,033sf | 0.30 mi | recent | |
| 4021 19th St | 2026-05-15 | $1.3M | $1,279,500 cut from $1.35M | $20,500 above asking (1.6%) | $1.33M | $1,246 | 2bd 2ba 1,070sf | 0.20 mi | 2 bd | |
| 523 Elizabeth St | 2026-03-25 | $25K | No asking price | — | $26K | $22 | 2bd 1ba 1,180sf | 0.32 mi | 2 bd | |
| 3892 19th St | 2026-10-08 | $1.75M | $1,498,000 | $252,000 above asking (16.8%) | $1.7M | $1,838 | 2bd 2ba 926sf | 0.31 mi | 2 bd, recent | |
| 77 Grand View Ave APT 301 | 2026-07-22 | $980K | $1,000,000 cut from $1.2M | $20,000 below asking (2.0%) | $1.03M | $940 | 2bd 2ba 1,100sf | 0.34 mi | 2 bd | |
| 4054 18th St | 2026-03-20 | $350K | No asking price | — | $362K | $229 | 3bd 1ba 1,582sf | 0.33 mi | ||
| 1218 Castro St | 2026-02-06 | $1.68M | No asking price | — | $1.8M | $1,702 | 2bd 2ba 1,055sf | 0.32 mi | 2 bd | |
| 584 Douglass Street | 2025-11-20 | $1.24M | $1,200,000 | $40,000 above asking (3.3%) | $1.4M | $1,318 | 1bd 1ba 1,065sf | 0.30 mi | ||
| 3882 23rd St | 2026-05-04 | $1.74M | $1,595,000 | $140,000 above asking (8.8%) | $1.78M | $1,867 | 2bd 2ba 953sf | 0.32 mi | 2 bd | |
| 677 Castro St APT 3 | 2026-06-23 | $920K | $899,000 | $21,000 above asking (2.3%) | $958K | $1,229 | 1bd 1ba 780sf | 0.12 mi | ||
| 803 Castro St | 2026-08-28 | $2.6M | No asking price | — | $2.7M | $1,126 | 3bd 2ba 2,400sf | <0.05 mi | recent | |
| 161 Collingwood St | 2026-03-17 | $2.05M | $1,795,000 | $255,000 above asking (14.2%) | $2.12M | $1,317 | 3bd 3ba 1,608sf | 0.27 mi | ||
| 574 Diamond St | 2026-04-17 | $2.8M | No asking price | — | $2.83M | $1,360 | 3bd 3ba 2,083sf | 0.27 mi | ||
| 212 Eureka St | 2026-08-18 | $1.25M | $1,088,000 | $167,000 above asking (15.3%) | $1.3M | $1,716 | 2bd 1ba 760sf | 0.29 mi | 2 bd, recent | |
| 620 Sanchez St | 2026-03-12 | $4.09M | No asking price | — | $4.22M | $2,346 | 3bd 2.5ba 1,800sf | 0.26 mi | ||
| 214 Eureka St | 2026-02-25 | $1.25M | $1,088,000 | $162,000 above asking (14.9%) | $1.34M | $1,610 | 2bd 1ba 832sf | 0.29 mi | 2 bd | |
| 4038 18th St | 2025-12-03 | $1.75M | $1,799,000 cut from $1.95M | $49,000 below asking (2.7%) | $2.02M | $1,017 | 3bd 3ba 1,985sf | 0.33 mi | ||
| 160 Hancock St APT 1 | 2026-03-16 | $2.5M | $2,150,000 | $350,000 above asking (16.3%) | $2.58M | $1,307 | 2bd 3ba 1,976sf | 0.31 mi | 2 bd | |
| 266 Cumberland St | 2026-10-26 | $3.1M | $2,200,000 | $900,000 above asking (40.9%) | $3.02M | $1,291 | 5bd 3ba 2,336sf | 0.30 mi | recent | |
| 3941 19th St | 2026-02-13 | $3.13M | No asking price | — | $3.35M | $1,557 | 3bd 2.5ba 2,154sf | 0.25 mi |
What other buyers offered
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