The Portside.
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Portside, 403 Main: one transfer this year, a top-floor corner two-bedroom at $1,300,000 off the MLS, bought from the developer in December 1997 for $425,000 and offered for rent at $10,000 a month the day after closing
One closing at 403 Main Street through October 15, against two in the 2025 window; $1,300,000 of volume against $1,950,000. The MLS record carries no floor area; the listing record gives 1,207 square feet, about $1,077 a foot, against $980 last year, $976 in 2024 and $1,132 across 12 sales in 2021. #815N transferred on June 29 with dues of $690 a month.
A home off market in this building
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The building
A visual survey of The Portside.
About The Portside
The Portside is a 59-unit condominium building in South Beach, San Francisco, built in 1997. 0 recorded sales in the 12 months to Nov 2, 2026.
The Portside, by the numbers
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Owner tenure patterns, price trajectories, sale-to-list ratios and off-market activity signals — available to members. Free to sign up.
Unlock enhanced data →Every recorded sale at The Portside
The Portside at 403 Main St has 34 recorded sales since 2020. None sold in the 12 months to Nov 2, 2026.
| Date | Unit | Price | Sq ft | $/sq ft |
|---|---|---|---|---|
| Jun 29, 2026 | 815N | $1,300,000 | — | — |
| May 27, 2026 | 208N | $540,000 BMR | 539 | — |
| Sep 15, 2025 | 413N | $850,000 | 811 | $1,048 |
| Aug 21, 2025 | 215N | $1,100,000 | 1,207 | $911 |
| Aug 13, 2024 | 520N | $1,070,000 | 1,083 | $988 |
| Jul 5, 2024 | 608N | $520,000 | 539 | $965 |
| Jun 25, 2024 | 505N | $528,000 | 493 | $1,071 |
| Jun 8, 2024 | 111N | $950,000 | 1,196 | $794 |
| Dec 7, 2023 | 512N | $879,000 | 1,094 | $803 |
| Mar 28, 2023 | 803N | $1,275,000 | 1,360 | $938 |
| Feb 24, 2023 | 208N | $515,000 | 539 | $955 |
| Dec 8, 2022 | 604N | $510,000 | 483 | $1,056 |
| Aug 12, 2022 | 519N | $915,000 | 864 | $1,059 |
| Jun 7, 2022 | 409N | $770,000 | 814 | $946 |
| Mar 9, 2022 | 516N | $858,000 | 862 | $995 |
The 15 most recent of 34 recorded sales, from county records and the MLS, one row per sale. Transfers under $100,000 are left out. BMR marks a below-market-rate sale: it is listed here and left out of every figure on this site.
Sale history by unit
31 units at The Portside have a recorded sale since 2016. Each page lists that unit’s recorded sales and the units directly above and below it.
How The Portside compares
Trailing-12-month performance against the half-mile surroundings and the broader market, plus quarter-by-quarter $/ft² history.
South Beach, by $/sf
Median price per square foot across South Beach buildings — last 12 months of closed sales. The Portside is highlighted.
Mortgage calculator
Back-of-envelope monthly cost for a purchase at The Portside. Defaults use the building’s recent median price and conservative market assumptions.
Numbers add up?
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Watch the market review
A short video walkthrough of recent sales in The Portside and the buildings around it — what’s moving, and what it means for value.
HOA & CC&R cheat sheet
A plain-English summary of The Portside’s rules, fees, rental policy, and the fine print that actually matters — delivered within 24 hours.
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