Home › Castro/Upper Market › 18th St
4231 18th St
Condo, 3 bd, 3 ba, 1,770 sqft, built 1908
Today’s estimate uses 1,770 sqft and the home’s latest facts. It does not estimate the home’s value at a past sale date.
46 sales inside 0.35 mi since Apr 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
Low confidence
$2,266,000
$1,677,000estimated range$3,036,000
From 45 comps at a weighted median of $1,280 per sqft.
- Block
- 2694
- Lot
- 038
- Sales
- Oct 2025 to Oct 2026
- Prices adjusted to
- 2026-10-30
- Within
- 0.35 mi
- Sold since
- Apr 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: 17.3% above final asking.
Middle half: 1.8% above asking to 21.9% above asking.
32 of 45 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 (46)
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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | 0.17 mi | similar size, 3 bd, recent | ||
| 98 Caselli Ave | 2026-04-17 | $1.3M | $1,400,000 | $100,000 below asking (7.1%) | $1.31M | $747 | 3bd 2ba 1,760sf | 0.26 mi | similar size, 3 bd | ||
| 143 Ord St | 2026-05-05 | $1.33M | $1,295,000 | $35,000 above asking (2.7%) | $1.36M | $825 | 2bd 1ba 1,653sf | 0.18 mi | similar size | ||
| 150 Eureka St #101 | 2026-04-14 | $720K | No asking price | — | $728K | — | 2bd 2ba | 0.11 mi | no size on record | ||
| 4054 18th St | 2026-03-20 | $350K | No asking price | — | $362K | $229 | 3bd 1ba 1,582sf | 0.15 mi | same street, 3 bd | ||
| 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 | 0.07 mi | recent | ||
| 39 Hartford St | 2025-12-04 | $1.71M | $1,399,000 | $306,000 above asking (21.9%) | $1.97M | $1,190 | 3bd 2ba 1,652sf | 0.19 mi | similar size, 3 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 | 0.17 mi | same street, 3 bd | ||
| 27 Ford St | 2026-09-18 | $2.2M | $1,795,000 | $405,000 above asking (22.6%) | $2.2M | $1,546 | 2bd 2ba 1,423sf | 0.31 mi | recent | ||
| 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 | 0.13 mi | |||
| 4052 18th St | 2026-06-24 | $1.43M | No asking price | — | $1.48M | $1,088 | 2bd 3ba 1,364sf | 0.15 mi | same street | ||
| 50 Collingwood St | 2026-10-16 | $2M | $1,599,000 | $401,000 above asking (25.1%) | $1.95M | $1,443 | 2bd 2ba 1,348sf | 0.07 mi | recent | ||
| 803 Castro St | 2026-08-28 | $2.6M | No asking price | — | $2.7M | $1,126 | 3bd 2ba 2,400sf | 0.35 mi | 3 bd, recent | ||
| 189 Collingwood St | 2026-07-22 | $1.67M | No asking price | — | $1.76M | $1,335 | 2bd 2ba 1,321sf | 0.10 mi | |||
| 222 States St | 2026-03-26 | $2.1M | $1,795,000 | $310,000 above asking (17.3%) | $2.17M | $1,554 | 2bd 2ba 1,399sf | 0.31 mi | |||
| 317 Douglass St | 2026-02-03 | $1.17M | No asking price | — | $1.25M | $954 | 3bd 1ba 1,309sf | 0.18 mi | 3 bd | ||
| 307 Castro St #2 | 2026-06-15 | $1.95M | No asking price | — | $2.03M | $1,555 | 2bd 2ba 1,306sf | 0.24 mi | |||
| 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 | 0.06 mi | similar size, 3 bd | ||
| 620 Sanchez St | 2026-03-12 | $4.09M | No asking price | — | $4.22M | $2,346 | 3bd 2.5ba 1,800sf | 0.35 mi | similar size, 3 bd | ||
| 4150 17th St APT 2 | 2026-06-16 | $1.93M | No asking price | — | $2.01M | $1,279 | 2bd 2ba 1,575sf | 0.16 mi | |||
| 48 Caselli Ave | 2026-10-16 | $1.5M | $1,395,000 | $105,000 above asking (7.5%) | $1.46M | $1,280 | 2bd 1ba 1,140sf | 0.21 mi | recent | ||
| 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 | 0.33 mi | 3 bd | ||
| 30 Flint St | 2025-11-14 | $1.73M | $1,695,000 cut from $1.75M | $30,000 above asking (1.8%) | $1.95M | $1,220 | 3bd 2ba 1,600sf | 0.28 mi | 3 bd | ||
| 214 Castro St | 2026-04-27 | $1.98M | $1,495,000 | $480,000 above asking (32.1%) | $2M | $1,456 | 2bd 2ba 1,372sf | 0.34 mi | |||
| 4660 18th St | 2025-12-03 | $2.4M | $2,499,000 | $99,000 below asking (4.0%) | $2.77M | $1,203 | 4bd 4ba 2,300sf | 0.32 mi | same street | ||
| 170 Corwin St | 2026-06-08 | $2.39M | Unclear | — | $2.49M | $1,127 | 4bd 2ba 2,210sf | 0.28 mi | |||
| 227 States St | 2026-06-16 | $2.5M | $1,995,000 | $505,000 above asking (25.3%) | $2.6M | $1,583 | 2bd 3ba 1,645sf | 0.30 mi | similar size | ||
| 4316 18th St | 2026-05-21 | $1.2M | $1,188,000 cut from $1.2M | $12,000 above asking (1.0%) | $1.23M | $1,197 | 2bd 1ba 1,028sf | <0.05 mi | nearby on same street | ||
| 4322 17th St #A | 2026-01-28 | $1.82M | $1,549,000 | $271,000 above asking (17.5%) | $2.09M | $1,313 | 3bd 3ba 1,589sf | 0.26 mi | 3 bd | ||
| 3043 Market St | 2026-09-15 | $852K | No asking price | — | $852K | $759 | 2bd 1ba 1,122sf | 0.28 mi | recent | ||
| 4150 17th St APT 22 | 2026-05-27 | $2.3M | $1,795,000 | $505,000 above asking (28.1%) | $2.36M | $1,626 | 2bd 2ba 1,451sf | 0.17 mi | |||
| 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 | 0.27 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 | 0.27 mi | |||
| 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 | 0.22 mi | |||
| 39 Douglass St | 2026-05-18 | $1.25M | $1,045,000 | $205,000 above asking (19.6%) | $1.28M | $1,196 | 2bd 1ba 1,072sf | 0.22 mi | |||
| 49 Seward St #1 | 2025-11-04 | $1.73M | $1,495,000 | $230,000 above asking (15.4%) | $1.95M | $1,343 | 2bd 2ba 1,454sf | 0.26 mi | |||
| 3941 19th St | 2026-02-13 | $3.13M | No asking price | — | $3.35M | $1,557 | 3bd 2.5ba 2,154sf | 0.31 mi | 3 bd | ||
| 4527 18th St | 2026-05-11 | $1.3M | $995,000 | $305,000 above asking (30.7%) | $1.33M | $1,207 | 1bd 1ba 1,105sf | 0.18 mi | same street | ||
| 28 Flint St | 2025-10-30 | $2.4M | $2,500,000 | $100,000 below asking (4.0%) | $2.72M | $1,191 | 4bd 3ba 2,280sf | 0.27 mi | |||
| 615 Noe St #2 | 2026-06-23 | $1.4M | $1,400,000 | At asking | $1.46M | $1,301 | 2bd 1ba 1,121sf | 0.26 mi | |||
| 45 Seward St #2 | 2026-10-15 | $2.9M | $2,795,000 | $105,000 above asking (3.8%) | $2.82M | $979 | 4bd 3ba 2,882sf | 0.26 mi | recent | ||
| 42 Ord St | 2026-04-17 | $4.1M | $2,795,000 | $1,305,000 above asking (46.7%) | $4.15M | $1,679 | 3bd 4ba 2,470sf | 0.27 mi | 3 bd | ||
| 32 Pond St | 2026-05-22 | $1.35M | $1,249,000 | $106,000 above asking (8.5%) | $1.39M | $1,421 | 2bd 1ba 978sf | 0.32 mi | |||
| 305 Castro St #100 | 2026-04-08 | $1.47M | No asking price | — | $1.49M | $1,233 | 1,206sf | 0.25 mi | |||
| 60 States St | 2026-03-27 | $1.3M | No asking price | — | $1.34M | $1,233 | 2bd 1ba 1,089sf | 0.20 mi | |||
| 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 | 0.32 mi |