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Key Biscayne is among the most exclusive residential markets in Miami-Dade County — limited inventory, high average sale prices, and a buyer pool that operates largely through referral and discretion. The market rewards relationship-driven agents and punishes the kind of aggressive marketing common in lower price tiers.
Key Biscayne is among the most exclusive residential markets in Miami-Dade County — limited inventory, high average sale prices, and a buyer pool that operates largely through referral and discretion. The market rewards relationship-driven agents and punishes the kind of aggressive marketing common in lower price tiers.
Key Biscayne is a percentage-split agent's most expensive place to work. On the island's mid-2026 median sale of roughly $2.52 million (Key Biscayne 33149 report, June 2026), a 3% side is about $75,600 gross — and a 20% house split quietly takes $15,120 of it, on a single closing. On a $9M Grand Bay or Ocean Club deal, that same split is $54,000 handed to the brokerage. At Gromadzki, the closing costs a flat $499, whether it's a Cape Florida condo or an oceanfront estate.
Ultra-luxury specialists, generational-wealth relationship experts, and discretion-focused agents serving Key Biscayne's exclusive buyer pool.
Ultra-luxury markets like Key Biscayne produce some of the highest commissions per transaction in the state. Even 3-5 deals per year at flat-fee pricing generates substantial savings versus a percentage-split brokerage.
Sources: Key Biscayne 33149 market report (June 2026); MIAMI REALTORS + RWorld / MIAMI MLS (June 2026); CondoBlackBook $1M+ cash data (2025). Island median swings by property mix — segment figures below are the reliable anchor.
Key Biscayne is a bounded island village of roughly 1.5 by 3 miles, and its headline number is genuinely hard to pin down because so few homes trade and the mix swings the median wildly. In mid-2026 the island-wide median sale sat around $2.52 million with homes going to contract in a median ~92 days, down from 102 a year earlier (Key Biscayne 33149 report, June 2026). Portals disagree by design: Zillow's typical home value was $1.65 million (Zillow, April 2026), while Redfin's small-sample city median printed near $1.4 million, down 24% year over year (Redfin, mid-2026) — a swing that reflects which segment closed that month, not a collapse in values.
For context, the surrounding county is a two-speed market: the Miami-Dade single-family median was $695,000, up 3.73% year over year, and existing condos $431,000, down 3.15% (MIAMI REALTORS + RWorld, June 2026). Key Biscayne trades at a multiple of both. The lesson for agents is the same one that governs this island: aggregate medians are close to meaningless here — you price on comparables within a building or a waterfront block, not on a zip-code average.
Key Biscayne behaves like two entirely different markets stacked on one zip code. Single-family homes — many waterfront or recently rebuilt — carry medians in the high-three-to-four-million range, selling around $1,040 per square foot, up about 27% year over year (Key Biscayne 33149 report, June 2026). Buyers here compete on lot size, dockage, elevation, and finish, and the village's single-family stock is effectively finite, which keeps well-located estates scarce.
The condo tier is a separate world. The median condo list price was $1,592,500 in June 2026, up from $1,295,000 a year earlier (David Siddons Group / BHHS EWM, June 2026), but the range is enormous — from entry units to nine-figure ambitions. The luxury flagships tell the story: Ocean Club (799 Crandon) saw 28 condos change hands over the trailing year at an average sale of ~$3.1 million, about $1,245 per square foot (CondoBlackBook, May 2026), while Grand Bay Residences carried just two listings priced $9.9M–$18.9M (2026). Thinner buildings like Cape Florida Club logged a single trade at $750,000 (CondoBlackBook, July 2026). Countywide, condos sit at 12.3 months of supply — a firm buyer's market versus 4.9 months for single-family (MIAMI REALTORS + RWorld, June 2026), so pricing and negotiation skill, not momentum, close condo deals here.
This is one of the most cash-saturated luxury markets in America. Across Miami, 82% of $1 million-and-up condo sales closed all-cash in 2025 (CondoBlackBook, 2025), and countywide cash still ran 48.5% of condo and 27.6% of single-family closings (MIAMI REALTORS + RWorld, June 2026). Key Biscayne's buyer pool skews to the extremes of that data: ultra-high-net-worth international purchasers (foreign nationals were about 18% of Q1 2026 Miami closed sales), second-home owners, and families chasing the Key Biscayne K-8 Center — consistently one of Miami-Dade's top-performing public schools and a documented price premium — plus feeder access to MAST Academy.
The defining 2025-26 shift is regulatory. Under Florida's post-Surfside SB-4D regime, associations can no longer waive reserves for structural items as of 2025, and buildings within three miles of the coast face accelerated 25-year milestone inspections — which is nearly every oceanfront tower on this island. Coastal South Florida special assessments tied to those findings have run $30,000 to well over $200,000 per unit, with some oceanfront towers exceeding $300,000 (SB-4D reporting, 2025-26). Add luxury-condo insurance of roughly $2,000–$6,000 a year in Miami-Dade (MILLION insurance guide, 2026), and the deal variable here isn't price — it's the reserve study, the assessment history, and the milestone status. Agents who read those documents win listings; agents who don't lose them.
Key Biscayne agents belong to MIAMI REALTORS — the Miami Association of REALTORS®, the largest local association in the U.S. at 60,000+ members — which as of a May 2026 merger with Broward, Palm Beaches & St. Lucie REALTORS® now operates as MIAMI REALTORS + RWorld (Florida Realtors, April 2026). Listings run through MIAMI MLS, part of the regional Southeast Florida MLS system, with reciprocal reach into BeachesMLS. One membership lets a Key Biscayne agent work Coconut Grove, Coral Gables, Brickell, and the beaches on the same license and the same MLS.
Now the math, at real island numbers. A single closing at the ~$2.52M island median grosses about $75,600 at 3% per side (MIAMI MLS-verified median, June 2026); a 20% split brokerage keeps $15,120 of that — every deal. An agent closing 6 sides a year at that median grosses roughly $453,600; a 20% split hands the house about $90,700 before monthly fees. At Gromadzki, those six closings cost $2,994 total, and the other ~$87,700 stays with the agent. Even at the discounted 2–2.5% commissions common on nine-figure inventory, the percentage a split takes on a $9M Grand Bay sale dwarfs a $499 flat fee. In a market this transaction-heavy in expertise and this thin in volume, keeping your full commission on every deal that closes is the whole point.
One simple structure, statewide. $499 per closed deal, $0 monthly, $0 annual — and you keep 100% of your commission on every Key Biscayne transaction.
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