300 Union Avenue.
Every unit here is open to an offer — listed or not.
Make an offer on any unit →See every sale in this building — freeA unit lists, a sale records, the HOA figures change. No account, and one click to stop.
See condos before they reach the listing sites.
Coming-soon listings, owners’ private numbers and the Investor Exchange, with the unit, price and photos of each. Nothing in 300 Union Avenue is off market today; a free account shows you everything that is.
About 300 Union Avenue
300 Union Avenue is a condominium building in Campbell, Silicon Valley. 0 recorded sales in the 12 months to Oct 26, 2026.
300 Union Avenue, 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 300 Union Avenue
300 Union Avenue at 300 Union Ave has 41 recorded sales since 2006. None sold in the 12 months to Oct 26, 2026.
| Date | Unit | Price | Sq ft | $/sq ft |
|---|---|---|---|---|
| Apr 29, 2025 | 37 | $688,000 | — | — |
| Dec 20, 2024 | 40 | $750,000 | — | — |
| Jun 13, 2024 | 19 | $775,000 | — | — |
| Dec 16, 2022 | 21 | $470,000 | — | — |
| May 17, 2022 | 40 | $990,000 | — | — |
| Dec 2, 2021 | 8 | $725,000 | — | — |
| Sep 15, 2021 | 13 | $522,000 | — | — |
| Jul 26, 2021 | 32 | $745,000 | — | — |
| Jul 10, 2021 | 9 | $750,000 | — | — |
| Apr 9, 2021 | 26 | $785,000 | — | — |
| Oct 19, 2020 | 10 | $710,000 | — | — |
| Jan 30, 2019 | 24 | $700,000 | — | — |
| Sep 12, 2018 | 22 | $720,000 | — | — |
| Nov 14, 2016 | 2 | $440,000 | — | — |
| Apr 22, 2016 | 9 | $580,000 | — | — |
The 15 most recent of 41 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.
How 300 Union Avenue compares
Trailing-12-month performance against the half-mile surroundings and the broader market, plus quarter-by-quarter $/ft² history.
Mortgage calculator
Back-of-envelope monthly cost for a purchase at 300 Union Avenue. Defaults use the building’s recent median price and conservative market assumptions.
Numbers add up?
Make this offer · $950,000 →Buy at or sell at 300 Union Avenue
You don’t need a unit to be listed to make a move. Submit an offer on any unit in the building, or name a price your own unit would sell for.
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Name the unit, the price, and your terms. We route it to the owner through standard channels and track the response in your dashboard.
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Set a Make-Me-Move number, not a listing. Keep living in your unit. We notify you only when a buyer’s offer matches your number.
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Get the inside view on 300 Union Avenue
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Watch the market review
A short video walkthrough of recent sales in 300 Union Avenue and the buildings around it — what’s moving, and what it means for value.
HOA & CC&R cheat sheet
A plain-English summary of 300 Union Avenue’s rules, fees, rental policy, and the fine print that actually matters — delivered within 24 hours.
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