Home › Castro/Upper Market › 21st St
3520 21st St
Single-family home, 2 bd, 2 ba, 1,942 sqft, built 1901
Today’s estimate uses 1,942 sqft and the home’s latest facts. It does not estimate the home’s value at a past sale date.
86 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
$3,712,000
$2,673,000estimated range$4,566,000
From 86 comps at a weighted median of $1,911 per sqft.
- Block
- 3606
- Lot
- 015
- Sales
- Oct 2025 to Oct 2026
- Prices adjusted to
- 2026-10-31
- Within
- 0.75 mi
- Sold since
- May 2025
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I'm interestedSale prices versus asking
Similarity-weighted median: 35.3% above final asking.
Middle half: 17.5% above asking to 66.0% above asking.
62 of 86 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 (86)
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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | 0.07 mi | similar size, 2 bd | ||
| 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 | 0.13 mi | same street, similar size, 2 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 | 0.21 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 | 0.38 mi | similar size, recent | ||
| 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 | 0.31 mi | similar size | ||
| 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 | 0.32 mi | similar size | ||
| 3828 23rd Street | 2026-09-10 | $1.85M | $1,699,000 | $151,000 above asking (8.9%) | $1.85M | $851 | 4bd 3ba 2,173sf | 0.26 mi | recent | ||
| 28 Hartford St | 2026-04-24 | $3M | No asking price | — | $3.07M | $1,606 | 3bd 3ba 1,915sf | 0.57 mi | similar size | ||
| 2971 21st St | 2026-07-31 | $2.65M | No asking price | — | $2.82M | $1,509 | 3bd 2ba 1,868sf | 0.67 mi | same street, similar size | ||
| 4023 25th St | 2026-06-04 | $4.3M | No asking price | — | $4.46M | $2,426 | 3bd 2ba 1,837sf | 0.54 mi | similar size | ||
| 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 | 0.12 mi | same street, similar size, 2 bd | ||
| 18 Ford St | 2026-09-28 | $4.34M | No asking price | — | $4.34M | $1,835 | 3bd 2ba 2,365sf | 0.47 mi | recent | ||
| 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 | 0.43 mi | similar size | ||
| 663 Guerrero St | 2026-03-11 | $2.62M | No asking price | — | $2.72M | $1,451 | 3bd 2ba 1,875sf | 0.30 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 | 0.29 mi | recent | ||
| 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 | 0.31 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 | 0.38 mi | recent | ||
| 907 Treat Ave | 2026-10-23 | $2.7M | $1,995,000 | $705,000 above asking (35.3%) | $2.59M | $1,511 | 3bd 2ba 1,712sf | 0.73 mi | recent | ||
| 730 Elizabeth St | 2026-05-13 | $2.85M | No asking price | — | $2.95M | $1,594 | 1ba 1,850sf | 0.68 mi | similar size | ||
| 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 | 0.34 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 | 0.55 mi | similar size | ||
| 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 | 0.70 mi | similar size | ||
| 3326 23rd St | 2026-06-01 | $3.48M | No asking price | — | $3.6M | $1,630 | 4bd 5ba 2,210sf | 0.43 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 | 0.68 mi | similar size | ||
| 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 | 0.46 mi | similar size | ||
| 442 Vicksburg St | 2026-05-18 | $2.25M | No asking price | — | $2.33M | $1,431 | 3bd 2ba 1,627sf | 0.48 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 | 0.61 mi | 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 | 0.29 mi | same street | ||
| 315 Capp St | 2026-03-30 | $1.25M | No asking price | — | $1.29M | $808 | 2bd 1ba 1,600sf | 0.56 mi | 2 bd | ||
| 4080 26th St | 2026-05-08 | $4M | No asking price | — | $4.14M | $2,225 | 4bd 3ba 1,860sf | 0.64 mi | similar size | ||
| 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 | 0.38 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 | 0.69 mi | similar size | ||
| 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 | 0.70 mi | similar size | ||
| 308 Diamond St | 2025-11-12 | $3M | $2,750,000 | $250,000 above asking (9.1%) | $3.49M | $1,911 | 3bd 2ba 1,828sf | 0.60 mi | similar size | ||
| 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 | 0.37 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 | 0.60 mi | similar size | ||
| 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 | 0.36 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 | 0.70 mi | 2 bd | ||
| 701 Castro St | 2026-04-21 | $4.29M | No asking price | — | $4.4M | $3,026 | 2ba 1,453sf | 0.45 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 | 0.31 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 | 0.19 mi | |||
| 4048 22nd St | 2026-07-15 | $3.77M | No asking price | — | $4.02M | $1,606 | 3bd 2ba 2,500sf | 0.64 mi | |||
| 331 Bartlett St | 2026-09-15 | $1.32M | No asking price | — | $1.32M | $1,019 | 2bd 1ba 1,300sf | 0.52 mi | 2 bd, recent | ||
| 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 | 0.66 mi | recent | ||
| 343 Cumberland St | 2026-09-03 | $3.17M | $1,995,000 | $1,180,000 above asking (59.1%) | $3.17M | $2,573 | 3bd 2ba 1,234sf | 0.30 mi | recent | ||
| 480 Bartlett St | 2026-10-19 | $2.13M | $1,995,000 | $130,000 above asking (6.5%) | $2.04M | $1,331 | 4bd 3ba 1,530sf | 0.64 mi | recent | ||
| 121 Clipper St | 2026-04-08 | $4.6M | No asking price | — | $4.71M | $2,050 | 4bd 3ba 2,300sf | 0.55 mi | |||
| 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 | 0.14 mi | same street | ||
| 359 Diamond St | 2026-02-04 | $2.23M | No asking price | — | $2.39M | $1,542 | 3bd 2ba 1,550sf | 0.57 mi | |||
| 3257 20th St | 2026-04-30 | $2.8M | $2,500,000 | $300,000 above asking (12.0%) | $2.87M | $1,086 | 2bd 2ba 2,642sf | 0.69 mi | 2 bd | ||
| 311 Cumberland St | 2026-07-15 | $1.92M | No asking price | — | $2.04M | $1,743 | 2bd 2ba 1,172sf | 0.28 mi | 2 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 | 0.73 mi | |||
| 877 Treat Ave | 2026-06-10 | $5M | $3,995,000 | $1,004,000 above asking (25.1%) | $5.18M | $2,191 | 4bd 3ba 2,365sf | 0.72 mi | |||
| 282 Eureka St | 2026-03-30 | $3.9M | No asking price | — | $4.05M | $1,726 | 4bd 3ba 2,346sf | 0.66 mi | |||
| 3906 23rd St | 2026-05-11 | $2.5M | $1,295,000 | $1,205,000 above asking (93.1%) | $2.59M | $2,273 | 2bd 1ba 1,138sf | 0.32 mi | 2 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 | 0.31 mi | recent | ||
| 4031 22nd St | 2025-10-31 | $2.53M | $1,495,000 | $1,038,000 above asking (69.4%) | $2.9M | $1,893 | 2bd 2ba 1,530sf | 0.62 mi | 2 bd | ||
| 441 Douglass St | 2026-05-18 | $4.5M | No asking price | — | $4.66M | $1,701 | 3bd 4ba 2,737sf | 0.68 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 | 0.73 mi | |||
| 4245 25th St | 2026-05-01 | $2.35M | $1,895,000 | $455,000 above asking (24.0%) | $2.43M | $1,707 | 3bd 2ba 1,424sf | 0.71 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 | 0.50 mi | |||
| 761 Noe St | 2026-03-27 | $1.52M | $1,595,000 cut from $1.65M | $70,000 below asking (4.4%) | $1.58M | $1,263 | 2bd 1ba 1,254sf | 0.33 mi | 2 bd | ||
| 278 Eureka St | 2026-01-02 | $2.52M | No asking price | — | $2.94M | $2,029 | 3bd 1ba 1,450sf | 0.66 mi | |||
| 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 | 0.62 mi | |||
| 4149 26th St | 2026-03-27 | $2.15M | $1,895,000 | $255,000 above asking (13.5%) | $2.23M | $1,588 | 3bd 3ba 1,406sf | 0.71 mi | |||
| 465 Liberty St | 2025-12-22 | $1.81M | $1,388,000 | $419,000 above asking (30.2%) | $2.14M | $1,665 | 2bd 2ba 1,284sf | 0.30 mi | 2 bd | ||
| 1040 Sanchez St | 2026-06-08 | $2.48M | No asking price | — | $2.58M | $2,385 | 3bd 2ba 1,080sf | 0.36 mi | |||
| 1604 Castro St | 2026-08-13 | $2.86M | $1,995,000 | $865,008 above asking (43.4%) | $3.02M | $2,576 | 2bd 1ba 1,173sf | 0.71 mi | 2 bd, recent | ||
| 267 Clipper St | 2026-08-31 | $6.4M | No asking price | — | $6.76M | $2,236 | 4bd 3ba 3,023sf | 0.61 mi | recent | ||
| 4047 Cesar Chavez St | 2025-11-04 | $2.05M | $1,899,000 | $151,000 above asking (8.0%) | $2.39M | $1,705 | 2bd 1ba 1,400sf | 0.69 mi | 2 bd | ||
| 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 | 0.56 mi | |||
| 3835 Cesar Chavez St | 2026-09-15 | $1M | No asking price | — | $1M | $332 | 5bd 6ba 3,015sf | 0.64 mi | recent | ||
| 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 | 0.61 mi | |||
| 621 Sanchez St | 2025-11-05 | $2.9M | No asking price | — | $3.38M | $1,409 | 4bd 3ba 2,400sf | 0.26 mi | |||
| 541 Diamond St | 2026-05-22 | $3.05M | $2,495,000 | $555,000 above asking (22.2%) | $3.16M | $2,869 | 2bd 2ba 1,100sf | 0.58 mi | 2 bd | ||
| 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 | 0.69 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 | 0.57 mi | |||
| 734 Elizabeth St | 2025-11-07 | $1.57M | $1,450,000 | $120,000 above asking (8.3%) | $1.83M | $1,404 | 3bd 1ba 1,302sf | 0.68 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 | 0.72 mi | recent | ||
| 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 | 0.36 mi | |||
| 1008 Castro St | 2026-04-01 | $2.2M | $1,795,000 | $405,000 above asking (22.6%) | $2.25M | $1,957 | 2bd 1ba 1,152sf | 0.51 mi | 2 bd | ||
| 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 | 0.58 mi | |||
| 145 Grand View Ave | 2026-07-17 | $3.1M | No asking price | — | $3.3M | $2,795 | 1ba 1,180sf | 0.74 mi | |||
| 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 | 0.31 mi | |||
| 439 Clipper St | 2025-12-05 | $4.85M | $4,850,000 | At asking | $5.74M | $1,818 | 4bd 6ba 3,157sf | 0.73 mi | |||
| 3775 16th St | 2025-10-29 | $2.42M | $1,995,000 | $425,000 above asking (21.3%) | $2.77M | $2,137 | 4bd 2ba 1,295sf | 0.75 mi |