Start shopping Key Biscayne and you will notice something strange fast: no two sources agree on "the" price. That is not a data glitch. It is the island telling on itself. Houses and condos here trade in two largely separate markets, and any single median mashes them into a number that describes neither one.

Why the headline number keeps changing

Take your pick, because the sources did. Redfin reported a median sale price of $1.4 million in March 2026, down 24% year over year, with homes averaging 183 days to sell. Zillow's broader home-value estimate for the same stretch landed around $1.65 million. A Broker One market-trends report covering the 33149 zip code through June 2026 showed a median sale price of $1,782,500 across 210 homes sold, plus a separate median condo list price of $1,592,500. Movoto's January 2026 data listed a median sale price of $2,287,500.

Every one of those is accurate. None of them is measuring the same thing. As a July 2026 analysis from Barbara Gretsch, citing Douglas Elliman's Q3 2025 Barrier Islands report, put it, one island median can hide wildly different conditions between waterfront estates and older condos. Single-family homes on Key Biscayne typically trade in the high three-to-four-million-dollar range, while condos, especially in older buildings, sell well below that. Anchor to the blended median and you are negotiating against a number that does not exist.

What the segmented data actually shows

Break it apart and it starts making sense. Here is the same market, sorted by what each figure is really counting:

• 33149 median sale price, all property types: about $2.52 million (Barbara Gretsch analysis citing Redfin, June 2026).
• Price per square foot: about $1,040, up 26.8% year over year (Redfin, June 2026).
• Median days on market: about 92 days, down from 102 (Redfin, June 2026).
• Median condo list price: $1,592,500, up from $1,295,000 a year earlier (Broker One, June 2026).
• Average list price per square foot, island-wide: $1,535 (Broker One, November 2025).
• Miami-Dade luxury sales: up more than 21% in Q1 2026, the island-relevant context (Barbara Gretsch analysis citing Q1 2026 luxury data).

Different providers, different methods, different windows. Presented as reported, not blended into one tidy average, because blending is exactly how buyers get misled here.

Inventory is up, and that matters

Broker One's June 2026 data counted 153 active listings in the 33149 zip code, a 50% jump from a year earlier, alongside a higher median asking price. Zoom out and a Q1 2026 Berkshire Hathaway HomeServices EWM analysis reported by the Islander News found Miami-Dade inventory down 9% year over year, closed sales up 3%, and 46% of EWM's sales closing in cash.

That cash figure is the tell. Key Biscayne's buyer pool skews heavily toward all-cash, high-net-worth purchasers, the kind who treat mortgage rates as background noise rather than a dealbreaker. When nearly half the county pays cash, rate headlines matter a lot less on the island than they do on the mainland.

Flood risk is now part of the price talk

There is no polite way around the water. Redfin's climate data shows 99% of Key Biscayne properties carry some level of flood risk over the next 30 years. The Village is not ignoring it: voters approved a $100 million resilience bond in November 2020 to fund elevated infrastructure and sea-level adaptation. On this island, elevation, flood zone, and insurance cost are standard due diligence now, not fine print you skim at closing.

The only question that actually helps

Given how differently houses and condos price here, the useful question is never "what is the median in Key Biscayne." It is "what have comparable properties in this specific segment, building, and condition actually closed for in the last few months."

A waterfront single-family home should be measured against other waterfront closings, not a zip-code-wide blend. A condo in a 1970s Crandon Boulevard building should be measured against comparable-vintage sales, not a newer low-density project a few blocks away. That segmentation, more than any headline figure, decides whether a listing is priced fairly. The same split shows up at the high end, where non-waterfront homes in the $5M to $7M range have their own stalemate.

On Key Biscayne, "the median" is the one number every serious buyer should learn to ignore.