Home › Castro/Upper Market › 21st St
3666 21st St
Single-family home, 1 ba, 2,880 sqft, built 1927
Today’s estimate uses 2,880 sqft and the home’s latest facts. It does not estimate the home’s value at a past sale date.
85 sales inside 0.75 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
$5,285,000
$3,805,000estimated range$6,501,000
From 85 comps at a weighted median of $1,835 per sqft.
- Block
- 3605
- Lot
- 020
- Sales
- Oct 2025 to Oct 2026
- Prices adjusted to
- 2026-11-01
- Within
- 0.75 mi
- Sold since
- May 2025
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I'm interestedSale prices versus asking
Similarity-weighted median: 28.3% above final asking.
Middle half: 13.7% above asking to 43.1% above asking.
64 of 85 selected comps have a verified final asking price.
Comparisons use the final advertised asking price from the same sale, before pending or closing.
Comparable sales (85)
Every sale inside the circle starts ticked. Untick one here, or click it on the map, to leave it out. Closer, more similar sales weigh more.
| Address | Sold | Price | Final asking | Sale vs. asking | Adj. today | $/sqft | Size | Dist. | Why | Match | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 3627 21st St | 2026-04-20 | $5.4M | $4,700,000 | $700,000 above asking (14.9%) | $5.53M | $1,843 | 3bd 3ba 3,003sf | 0.05 mi | nearby on same street, similar size | ||
| 476 Liberty St | 2026-09-28 | $5.6M | $3,795,000 | $1,805,000 above asking (47.6%) | $5.6M | $1,747 | 4bd 4ba 3,205sf | 0.15 mi | recent | ||
| 143 Collingwood St | 2026-06-08 | $4.85M | $3,695,000 | $1,155,000 above asking (31.3%) | $5.03M | $1,736 | 4bd 4ba 2,895sf | 0.42 mi | similar size | ||
| 971 Sanchez St | 2026-10-16 | $4.95M | $2,995,000 | $1,956,522 above asking (65.3%) | $4.75M | $1,933 | 4bd 3ba 2,455sf | 0.21 mi | recent | ||
| 3961 25th St | 2026-05-26 | $5.8M | $5,495,000 | $305,000 above asking (5.6%) | $6M | $2,114 | 4bd 4ba 2,838sf | 0.47 mi | similar size | ||
| 267 Clipper St | 2026-08-31 | $6.4M | No asking price | — | $6.76M | $2,236 | 4bd 3ba 3,023sf | 0.55 mi | similar size, recent | ||
| 4075 20th St | 2026-06-26 | $5.58M | $4,295,000 | $1,285,000 above asking (29.9%) | $5.78M | $1,775 | 4bd 3ba 3,258sf | 0.15 mi | |||
| 941 Diamond St | 2026-10-01 | $5.66M | $4,850,000 | $807,750 above asking (16.7%) | $5.42M | $1,720 | 4bd 4ba 3,153sf | 0.59 mi | similar size, recent | ||
| 553 Douglass St | 2026-08-27 | $5M | $3,785,000 | $1,214,999 above asking (32.1%) | $5.28M | $1,707 | 5bd 4ba 3,095sf | 0.52 mi | similar size, recent | ||
| 537 Liberty St | 2026-08-20 | $3.58M | $3,699,000 | $119,000 below asking (3.2%) | $3.78M | $1,667 | 5bd 3ba 2,269sf | 0.21 mi | recent | ||
| 441 Douglass St | 2026-05-18 | $4.5M | No asking price | — | $4.66M | $1,701 | 3bd 4ba 2,737sf | 0.51 mi | similar size | ||
| 591 Diamond St | 2026-10-05 | $4.38M | $3,295,000 | $1,080,000 above asking (32.8%) | $4.19M | $1,769 | 3bd 4ba 2,370sf | 0.45 mi | recent | ||
| 335 Diamond St | 2026-04-08 | $6.42M | $6,800,000 | $375,000 below asking (5.5%) | $6.58M | $2,072 | 3bd 3ba 3,178sf | 0.39 mi | similar size | ||
| 18 Ford St | 2026-09-28 | $4.34M | No asking price | — | $4.34M | $1,835 | 3bd 2ba 2,365sf | 0.40 mi | recent | ||
| 3666 22nd St | 2026-07-06 | $3.8M | $3,100,000 | $700,000 above asking (22.6%) | $4.04M | $1,939 | 3bd 3ba 2,085sf | 0.12 mi | |||
| 3828 23rd Street | 2026-09-10 | $1.85M | $1,699,000 | $151,000 above asking (8.9%) | $1.85M | $851 | 4bd 3ba 2,173sf | 0.23 mi | recent | ||
| 279 Diamond St | 2026-01-28 | $4.58M | $3,495,000 | $1,085,000 above asking (31.0%) | $5.34M | $1,773 | 4bd 3ba 3,010sf | 0.41 mi | similar size | ||
| 4048 22nd St | 2026-07-15 | $3.77M | No asking price | — | $4.02M | $1,606 | 3bd 2ba 2,500sf | 0.47 mi | |||
| 3835 Cesar Chavez St | 2026-09-15 | $1M | No asking price | — | $1M | $332 | 5bd 6ba 3,015sf | 0.66 mi | similar size, recent | ||
| 3761 21st St | 2026-02-03 | $4.63M | $4,295,000 | $340,000 above asking (7.9%) | $4.96M | $2,203 | 4bd 4ba 2,250sf | 0.12 mi | same street | ||
| 4118 20th St | 2026-04-29 | $4.4M | $2,995,000 | $1,405,000 above asking (46.9%) | $4.51M | $1,972 | 4bd 4ba 2,287sf | 0.22 mi | |||
| 893 Elizabeth St | 2026-06-15 | $3.21M | $3,295,000 | $82,500 below asking (2.5%) | $3.33M | $1,249 | 4bd 3ba 2,665sf | 0.70 mi | similar size | ||
| 771 Elizabeth St | 2026-07-24 | $5.85M | $4,795,000 | $1,055,000 above asking (22.0%) | $6.22M | $2,432 | 4bd 4ba 2,559sf | 0.58 mi | |||
| 3960 20th St | 2025-11-10 | $4.7M | $4,395,000 | $305,000 above asking (6.9%) | $5.47M | $2,372 | 4bd 4ba 2,308sf | 0.11 mi | |||
| 346 Duncan St | 2026-10-15 | $6.35M | $4,895,000 | $1,456,000 above asking (29.7%) | $6.09M | $1,889 | 4bd 3ba 3,223sf | 0.73 mi | recent | ||
| 323 Eureka St | 2026-03-12 | $5M | $3,495,000 | $1,504,999 above asking (43.1%) | $5.19M | $2,016 | 4bd 4ba 2,576sf | 0.45 mi | |||
| 3983 19th St | 2026-02-11 | $3.3M | $3,295,000 | $5,000 above asking (0.2%) | $3.53M | $1,598 | 4bd 3ba 2,208sf | 0.24 mi | |||
| 3846 Cesar Chavez St | 2026-05-04 | $3.5M | $1,995,000 | $1,505,000 above asking (75.4%) | $3.62M | $1,305 | 4bd 5ba 2,775sf | 0.63 mi | similar size | ||
| 438 Elizabeth St | 2026-08-28 | $4.93M | $3,295,000 | $1,635,000 above asking (49.6%) | $5.21M | $2,489 | 3bd 3ba 2,092sf | 0.29 mi | recent | ||
| 4048 23rd St | 2026-05-15 | $4.79M | $3,195,000 | $1,594,423 above asking (49.9%) | $4.96M | $2,335 | 4bd 2ba 2,122sf | 0.32 mi | |||
| 3622 21st St | 2026-02-17 | $3.3M | $1,988,000 | $1,312,000 above asking (66.0%) | $3.53M | $1,895 | 2bd 2ba 1,862sf | <0.05 mi | nearby on same street | ||
| 316 Douglass St | 2026-04-09 | $4.2M | $3,695,000 | $505,000 above asking (13.7%) | $4.3M | $1,779 | 3bd 4ba 2,420sf | 0.56 mi | |||
| 1177 Guerrero St | 2025-10-30 | $4.35M | $3,895,000 | $455,000 above asking (11.7%) | $4.97M | $1,736 | 4bd 4ba 2,865sf | 0.47 mi | similar size | ||
| 4356 25th St | 2026-06-03 | $4.8M | $3,500,000 | $1,300,000 above asking (37.1%) | $4.97M | $1,959 | 3bd 3ba 2,540sf | 0.65 mi | |||
| 3853 22nd St | 2026-03-10 | $4.58M | $2,598,000 | $1,977,000 above asking (76.1%) | $4.75M | $2,259 | 3bd 3ba 2,103sf | 0.27 mi | |||
| 621 Sanchez St | 2025-11-05 | $2.9M | No asking price | — | $3.38M | $1,409 | 4bd 3ba 2,400sf | 0.17 mi | |||
| 282 Eureka St | 2026-03-30 | $3.9M | No asking price | — | $4.05M | $1,726 | 4bd 3ba 2,346sf | 0.49 mi | |||
| 4333 23rd St | 2026-04-08 | $3.2M | $2,495,000 | $705,000 above asking (28.3%) | $3.28M | $1,329 | 3bd 3ba 2,467sf | 0.65 mi | |||
| 4558 19th St | 2026-06-12 | $5.4M | $5,495,000 | $95,000 below asking (1.7%) | $5.6M | $1,490 | 5bd 6ba 3,757sf | 0.62 mi | |||
| 249 Fair Oaks St | 2026-04-28 | $4.7M | $4,000,000 | $700,000 above asking (17.5%) | $4.82M | $2,117 | 3bd 3ba 2,275sf | 0.40 mi | |||
| 381 Liberty St | 2026-06-04 | $8.75M | $5,995,000 | $2,755,000 above asking (46.0%) | $9.07M | $2,184 | 5bd 4ba 4,152sf | <0.05 mi | |||
| 121 Clipper St | 2026-04-08 | $4.6M | No asking price | — | $4.71M | $2,050 | 4bd 3ba 2,300sf | 0.53 mi | |||
| 3879 23rd St | 2025-10-27 | $3.2M | $2,295,000 | $905,000 above asking (39.4%) | $3.66M | $1,645 | 4bd 4ba 2,225sf | 0.25 mi | |||
| 731 Noe St | 2026-06-24 | $3.55M | $2,695,000 | $855,000 above asking (31.7%) | $3.68M | $2,080 | 3bd 2ba 1,769sf | 0.16 mi | |||
| 3616 21st St | 2026-01-30 | $4.23M | $2,188,000 | $2,037,888 above asking (93.1%) | $4.92M | $2,589 | 2bd 2ba 1,902sf | <0.05 mi | nearby on same street | ||
| 439 Clipper St | 2025-12-05 | $4.85M | $4,850,000 | At asking | $5.74M | $1,818 | 4bd 6ba 3,157sf | 0.63 mi | similar size | ||
| 889 Elizabeth St | 2026-03-20 | $6.9M | $5,695,000 | $1,205,000 above asking (21.2%) | $7.17M | $2,104 | 4bd 4ba 3,405sf | 0.69 mi | |||
| 4001 21st St | 2026-01-06 | $8.16M | No asking price | — | $9.51M | $2,502 | 0bd 0ba 3,800sf | 0.36 mi | same street | ||
| 481 Jersey St | 2026-04-20 | $7.6M | No asking price | — | $7.79M | $2,164 | 4bd 3.5ba 3,600sf | 0.57 mi | |||
| 264 Liberty St | 2026-05-11 | $3.75M | $1,995,000 | $1,755,000 above asking (88.0%) | $3.88M | $2,174 | 2bd 2ba 1,785sf | 0.13 mi | |||
| 3326 23rd St | 2026-06-01 | $3.48M | No asking price | — | $3.6M | $1,630 | 4bd 5ba 2,210sf | 0.58 mi | |||
| 938 Sanchez St | 2025-11-05 | $6.5M | $5,995,000 | $505,000 above asking (8.4%) | $7.57M | $1,949 | 4bd 4ba 3,885sf | 0.18 mi | |||
| 818 Douglass St | 2026-02-18 | $7.25M | $5,898,000 | $1,352,000 above asking (22.9%) | $7.75M | $2,257 | 4bd 4ba 3,434sf | 0.67 mi | |||
| 168 Jersey St | 2025-11-10 | $7.2M | No asking price | — | $8.39M | $2,254 | 4bd 5ba 3,720sf | 0.39 mi | |||
| 80 Diamond St | 2026-04-22 | $3.83M | $2,995,000 | $833,000 above asking (27.8%) | $3.92M | $1,877 | 3bd 3ba 2,090sf | 0.54 mi | |||
| 685 Corbett Ave | 2026-05-27 | $1.96M | $1,745,000 | $210,000 above asking (12.0%) | $2.02M | $967 | 3bd 3ba 2,092sf | 0.74 mi | |||
| 4431 19th St | 2026-04-24 | $2.6M | $2,500,000 | $100,000 above asking (4.0%) | $2.66M | $1,302 | 3bd 2ba 2,046sf | 0.54 mi | |||
| 133 Vicksburg St | 2026-02-13 | $3.75M | $2,695,000 | $1,055,000 above asking (39.1%) | $4.01M | $2,072 | 3bd 2ba 1,935sf | 0.27 mi | |||
| 132 Corbett Ave | 2026-05-21 | $3.2M | $2,495,000 | $705,000 above asking (28.3%) | $3.31M | $1,571 | 4bd 3ba 2,107sf | 0.74 mi | |||
| 449 Alvarado St | 2026-06-04 | $4.95M | $3,750,000 | $1,200,000 above asking (32.0%) | $5.13M | $3,023 | 4bd 3ba 1,697sf | 0.22 mi | |||
| 663 Guerrero St | 2026-03-11 | $2.62M | No asking price | — | $2.72M | $1,451 | 3bd 2ba 1,875sf | 0.43 mi | |||
| 28 Hartford St | 2026-04-24 | $3M | No asking price | — | $3.07M | $1,606 | 3bd 3ba 1,915sf | 0.46 mi | |||
| 3974 22nd St | 2026-02-23 | $3.08M | $2,795,000 | $280,000 above asking (10.0%) | $3.29M | $1,777 | 3bd 2ba 1,850sf | 0.39 mi | |||
| 4258 26th St | 2026-04-23 | $5M | No asking price | — | $5.12M | $1,330 | 5bd 5ba 3,854sf | 0.66 mi | |||
| 4023 25th St | 2026-06-04 | $4.3M | No asking price | — | $4.46M | $2,426 | 3bd 2ba 1,837sf | 0.48 mi | |||
| 4403 24th St | 2026-05-13 | $2.85M | $2,150,000 | $705,000 above asking (32.8%) | $2.95M | $1,369 | 3bd 3ba 2,157sf | 0.75 mi | |||
| 1840 Castro St | 2026-06-18 | $3.85M | $2,495,000 | $1,355,000 above asking (54.3%) | $3.99M | $1,928 | 4bd 3ba 2,070sf | 0.73 mi | |||
| 730 Elizabeth St | 2026-05-13 | $2.85M | No asking price | — | $2.95M | $1,594 | 1ba 1,850sf | 0.52 mi | |||
| 4367 21st St | 2026-05-11 | $3.13M | $2,395,000 | $733,000 above asking (30.6%) | $3.24M | $1,717 | 4bd 3ba 1,885sf | 0.60 mi | same street | ||
| 1621 Castro St | 2026-06-12 | $4.2M | $3,498,000 | $702,000 above asking (20.1%) | $4.35M | $2,275 | 4bd 4ba 1,913sf | 0.60 mi | |||
| 4080 26th St | 2026-05-08 | $4M | No asking price | — | $4.14M | $2,225 | 4bd 3ba 1,860sf | 0.57 mi | |||
| 268 Grand View Ave | 2026-04-07 | $4.2M | Unclear | — | $4.3M | $1,263 | 4bd 4ba 3,407sf | 0.69 mi | |||
| 481 27th St | 2026-09-01 | $2.61M | $1,898,000 | $713,000 above asking (37.6%) | $2.61M | $1,460 | 3bd 3ba 1,788sf | 0.71 mi | recent | ||
| 442 Vicksburg St | 2026-05-18 | $2.25M | No asking price | — | $2.33M | $1,431 | 3bd 2ba 1,627sf | 0.45 mi | |||
| 308 Diamond St | 2025-11-12 | $3M | $2,750,000 | $250,000 above asking (9.1%) | $3.49M | $1,911 | 3bd 2ba 1,828sf | 0.43 mi | |||
| 522 Liberty St | 2025-11-26 | $2.1M | $2,195,000 | $95,000 below asking (4.3%) | $2.45M | $1,519 | 3bd 2ba 1,610sf | 0.20 mi | |||
| 306 Diamond St | 2025-11-13 | $2.6M | $1,750,000 | $850,000 above asking (48.6%) | $3.03M | $1,685 | 3bd 2ba 1,797sf | 0.42 mi | |||
| 35 Hattie Street | 2025-11-25 | $2.13M | $2,190,000 cut from $2.9M | $63,400 below asking (2.9%) | $2.48M | $984 | 5bd 5ba 2,518sf | 0.70 mi | |||
| 359 Douglass St | 2026-03-11 | $2.06M | $1,195,000 | $860,000 above asking (72.0%) | $2.13M | $1,280 | 2bd 1ba 1,667sf | 0.53 mi | |||
| 32 Carson St | 2026-04-17 | $3.4M | $2,585,000 | $815,000 above asking (31.5%) | $3.48M | $2,087 | 3bd 3ba 1,670sf | 0.59 mi | |||
| 1375 Sanchez St | 2026-04-03 | $4.03M | $2,695,000 | $1,330,000 above asking (49.4%) | $4.13M | $2,342 | 3bd 2ba 1,761sf | 0.66 mi | |||
| 1462 Guerrero St | 2026-09-15 | $1.93M | $1,495,000 | $435,000 above asking (29.1%) | $1.93M | $1,209 | 4bd 4ba 1,597sf | 0.72 mi | recent | ||
| 4287 Cesar Chavez St | 2026-07-13 | $2.9M | $2,500,000 | $400,000 above asking (16.0%) | $3.09M | $1,763 | 4bd 3ba 1,750sf | 0.75 mi | |||
| 135 Corbett Ave | 2026-05-07 | $2.6M | $1,950,000 | $650,000 above asking (33.3%) | $2.69M | $1,642 | 3bd 2ba 1,638sf | 0.73 mi | |||
| 315 Capp St | 2026-03-30 | $1.25M | No asking price | — | $1.29M | $808 | 2bd 1ba 1,600sf | 0.71 mi |