Home › Castro/Upper Market › 21st St
3930 21st St
Single-family home, 4 bd, 4 ba, 3,400 sqft, built 1999
Today’s estimate uses 3,400 sqft and the home’s latest facts. It does not estimate the home’s value at a past sale date.
82 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
$6,035,000
$4,345,000estimated range$7,423,000
From 82 comps at a weighted median of $1,775 per sqft.
- Block
- 2752
- Lot
- 021
- Sales
- Oct 2025 to Oct 2026
- Prices adjusted to
- 2026-10-31
- Within
- 0.75 mi
- Sold since
- May 2025
What other buyers offered
No one has reported a losing offer on this home yet.
Create a free account to see offers and add yours
Free, and there is no password: we email you a sign-in code. Already a member? The same button signs you in.
Interested in this home?
Answer a few quick questions and we'll show you what to do next, from getting pre-approved to making an offer.
I'm interestedSale prices versus asking
Similarity-weighted median: 29.9% above final asking.
Middle half: 12.3% above asking to 32.1% above asking.
64 of 82 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 (82)
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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | 0.21 mi | similar size, 4 bd | ||
| 268 Grand View Ave | 2026-04-07 | $4.2M | Unclear | — | $4.3M | $1,263 | 4bd 4ba 3,407sf | 0.38 mi | similar size, 4 bd | ||
| 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 | 0.19 mi | similar size, 4 bd, recent | ||
| 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 | 0.30 mi | |||
| 4001 21st St | 2026-01-06 | $8.16M | No asking price | — | $9.51M | $2,502 | 0bd 0ba 3,800sf | <0.05 mi | nearby on same street | ||
| 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 | 0.09 mi | similar size | ||
| 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 | 0.45 mi | similar size, 4 bd, 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 | 0.27 mi | 4 bd | ||
| 1391 Clayton St | 2026-10-09 | $4.79M | $3,995,000 | $795,000 above asking (19.9%) | $4.59M | $1,739 | 4bd 5ba 2,640sf | 0.65 mi | 4 bd, 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 | 0.21 mi | similar size, recent | ||
| 4532 17th St | 2026-06-12 | $3.35M | $2,995,000 cut from $3.69M | $355,000 above asking (11.9%) | $3.47M | $1,163 | 3bd 3ba 2,985sf | 0.72 mi | |||
| 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 | 0.43 mi | similar size, 4 bd | ||
| 4822 19th St | 2025-12-17 | $3.48M | $3,475,000 | At asking | $4.11M | $1,440 | 4bd 5ba 2,855sf | 0.52 mi | 4 bd | ||
| 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 | 0.34 mi | similar size | ||
| 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 | 0.36 mi | same street | ||
| 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 | 0.15 mi | 4 bd | ||
| 471 Hoffman Ave | 2026-09-22 | $9.1M | $6,995,000 | $2,105,000 above asking (30.1%) | $9.1M | $2,132 | 5bd 5ba 4,268sf | 0.53 mi | recent | ||
| 481 Jersey St | 2026-04-20 | $7.6M | No asking price | — | $7.79M | $2,164 | 4bd 3.5ba 3,600sf | 0.42 mi | similar size, 4 bd | ||
| 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 | 0.46 mi | similar size, 4 bd | ||
| 10 Deming St | 2026-07-28 | $5.9M | $4,450,000 | $1,450,000 above asking (32.6%) | $6.28M | $1,955 | 4bd 4ba 3,211sf | 0.60 mi | similar size, 4 bd | ||
| 267 Clipper St | 2026-08-31 | $6.4M | No asking price | — | $6.76M | $2,236 | 4bd 3ba 3,023sf | 0.56 mi | 4 bd, recent | ||
| 4524 25th St | 2026-06-01 | $6.73M | $5,995,000 | $738,500 above asking (12.3%) | $6.98M | $1,863 | 5bd 5ba 3,745sf | 0.53 mi | similar size | ||
| 49 Eagle St | 2025-12-11 | $5.63M | No asking price | — | $6.66M | $2,024 | 4bd 5ba 3,290sf | 0.45 mi | similar size, 4 bd | ||
| 441 Douglass St | 2026-05-18 | $4.5M | No asking price | — | $4.66M | $1,701 | 3bd 4ba 2,737sf | 0.20 mi | |||
| 1201 Douglass St | 2026-10-15 | $6.3M | $5,495,000 | $805,000 above asking (14.6%) | $6.04M | $2,001 | 4bd 4ba 3,017sf | 0.66 mi | 4 bd, recent | ||
| 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 | 0.47 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 | 0.43 mi | 4 bd | ||
| 621 Sanchez St | 2025-11-05 | $2.9M | No asking price | — | $3.38M | $1,409 | 4bd 3ba 2,400sf | 0.34 mi | 4 bd | ||
| 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 | 0.14 mi | 4 bd | ||
| 4048 22nd St | 2026-07-15 | $3.77M | No asking price | — | $4.02M | $1,606 | 3bd 2ba 2,500sf | 0.18 mi | |||
| 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 | 0.34 mi | 4 bd | ||
| 221 Danvers St | 2026-07-14 | $4.55M | $3,995,000 | $555,000 above asking (13.9%) | $4.84M | $1,662 | 3bd 4ba 2,912sf | 0.47 mi | |||
| 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 | 0.23 mi | recent | ||
| 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 | 0.35 mi | 4 bd, recent | ||
| 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 | 0.46 mi | |||
| 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 | 0.11 mi | recent | ||
| 439 Clipper St | 2025-12-05 | $4.85M | $4,850,000 | At asking | $5.74M | $1,818 | 4bd 6ba 3,157sf | 0.53 mi | similar size, 4 bd | ||
| 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 | 0.31 mi | 4 bd | ||
| 4376 17th St | 2026-04-15 | $3.4M | $3,295,000 | $105,000 above asking (3.2%) | $3.48M | $1,144 | 3bd 4ba 3,045sf | 0.58 mi | |||
| 3961 25th St | 2026-05-26 | $5.8M | $5,495,000 | $305,000 above asking (5.6%) | $6M | $2,114 | 4bd 4ba 2,838sf | 0.57 mi | 4 bd | ||
| 168 Jersey St | 2025-11-10 | $7.2M | No asking price | — | $8.39M | $2,254 | 4bd 5ba 3,720sf | 0.50 mi | similar size, 4 bd | ||
| 752 Duncan St | 2026-07-02 | $6.1M | No asking price | — | $6.49M | $1,474 | 5bd 7ba 4,402sf | 0.73 mi | |||
| 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 | 0.17 mi | 4 bd | ||
| 4258 26th St | 2026-04-23 | $5M | No asking price | — | $5.12M | $1,330 | 5bd 5ba 3,854sf | 0.56 mi | |||
| 282 Eureka St | 2026-03-30 | $3.9M | No asking price | — | $4.05M | $1,726 | 4bd 3ba 2,346sf | 0.19 mi | 4 bd | ||
| 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 | 0.28 mi | |||
| 1 Newburg St | 2026-01-20 | $4.75M | No asking price | — | $5.54M | $2,119 | 4bd 3ba 2,612sf | 0.70 mi | 4 bd | ||
| 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 | 0.20 mi | same street, 4 bd | ||
| 871 27th St | 2026-06-01 | $4.88M | $4,875,000 | At asking | $5.05M | $2,273 | 4bd 3ba 2,223sf | 0.74 mi | 4 bd | ||
| 18 Ford St | 2026-09-28 | $4.34M | No asking price | — | $4.34M | $1,835 | 3bd 2ba 2,365sf | 0.45 mi | recent | ||
| 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 | 0.37 mi | |||
| 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 | 0.24 mi | 4 bd | ||
| 3828 23rd Street | 2026-09-10 | $1.85M | $1,699,000 | $151,000 above asking (8.9%) | $1.85M | $851 | 4bd 3ba 2,173sf | 0.43 mi | 4 bd, recent | ||
| 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 | 0.27 mi | 4 bd | ||
| 685 Corbett Ave | 2026-05-27 | $1.96M | $1,745,000 | $210,000 above asking (12.0%) | $2.02M | $967 | 3bd 3ba 2,092sf | 0.42 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 | 0.66 mi | 4 bd | ||
| 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 | 0.16 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 | 0.35 mi | 4 bd | ||
| 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 | 0.33 mi | |||
| 45 Deming St | 2026-10-22 | $3M | $2,195,000 | $805,000 above asking (36.7%) | $2.88M | $1,478 | 4bd 2ba 1,945sf | 0.63 mi | 4 bd, recent | ||
| 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 | 0.35 mi | recent | ||
| 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 | 0.51 mi | 4 bd | ||
| 4335 Cesar Chavez St | 2025-11-04 | $3.71M | $3,495,000 | $210,000 above asking (6.0%) | $4.32M | $1,684 | 4bd 4ba 2,563sf | 0.65 mi | 4 bd | ||
| 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 | 0.27 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 | 0.28 mi | same street, 4 bd | ||
| 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 | 0.36 mi | |||
| 121 Clipper St | 2026-04-08 | $4.6M | No asking price | — | $4.71M | $2,050 | 4bd 3ba 2,300sf | 0.65 mi | 4 bd | ||
| 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 | 0.37 mi | same street | ||
| 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 | 0.39 mi | 4 bd | ||
| 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 | 0.74 mi | 4 bd | ||
| 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 | 0.49 mi | |||
| 27 Saturn St | 2025-11-17 | $2.6M | $2,700,000 | $100,000 below asking (3.7%) | $3.03M | $1,525 | 3bd 2ba 1,985sf | 0.55 mi | |||
| 3348 Market St | 2026-05-26 | $2.25M | $2,500,000 | $250,000 below asking (10.0%) | $2.33M | $1,206 | 2bd 2ba 1,930sf | 0.48 mi | |||
| 28 Hartford St | 2026-04-24 | $3M | No asking price | — | $3.07M | $1,606 | 3bd 3ba 1,915sf | 0.40 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 | 0.66 mi | |||
| 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 | 0.54 mi | 4 bd | ||
| 1278 Clayton St | 2025-12-09 | $3.5M | No asking price | — | $4.14M | $1,762 | 3bd 4ba 2,350sf | 0.67 mi | |||
| 4370 Cesar Chavez St | 2026-03-10 | $2.25M | $1,488,000 | $762,000 above asking (51.2%) | $2.34M | $1,249 | 3bd 2ba 1,870sf | 0.64 mi | |||
| 663 Guerrero St | 2026-03-11 | $2.62M | No asking price | — | $2.72M | $1,451 | 3bd 2ba 1,875sf | 0.71 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 | 0.44 mi | |||
| 146 Henry St | 2025-11-10 | $3.29M | $3,459,000 | $169,500 below asking (4.9%) | $3.83M | $1,882 | 3bd 2ba 2,036sf | 0.74 mi | |||
| 376 Corbett Ave | 2025-11-20 | $2.13M | $1,695,000 | $430,000 above asking (25.4%) | $2.47M | $1,279 | 3bd 3ba 1,935sf | 0.64 mi |