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The 90-Day Key Biscayne Real Estate Report Q3 2021
Our First 90-Day Key Biscayne Real Estate Report Q3 2021
Key Biscayne Homes and Condos
Welcome to the first 90-Day market report for Key Biscayne. As the Miami market moves at an incredible speed, we decided to start creating quarterly reports that are useful for both sellers and buyers. These reports will provide you with a complete overview of the market in less than 10 minutes covering the most important market data (months of inventory, number of active listings, sales and pending deals, key sales in the area and average sales prices per SF) in combination with our signature social narrative.
This report compares the last 90 days (essentially quarter 3 of 2021 to the same periods of time in 2019 and 2020)
The David Siddons Group represented the seller in a record breaking Key Biscayne condo deal
The David Siddons Group sold 251 Crandon Blvd Unit#938 for $1.9M, $100K above its asking price. The unit traded for $1,129 per SF, the highest sales price per SF ever recorded at Key Colony. The previous record in the building was set in 2014 and was a sales price of $900 per SF.
The 90-Day Key Biscayne Luxury Real Estate Report for the Single Family Home Market
The Prices per SF
Sales Data and Months of Inventory

The Key Biscayne Single-Family Home market continues shattering records with tripling annual sales volumes and shocking all-time inventory lows. But, what is selling in Key Biscayne? Bestsellers are new(er) homes in premium locations! In fact, more $15M+ homes have sold in the last six months than in the prior ten years
- 9 Harbor Point, a 2005, 11,000 square feet home on a large lot, sold for a record $18M or slightly over $1,600 per SF. The home is accessed through a private road and provides unobstructed Miami Skyline views in an open bay location. By the way, this home was designed by Cesar Molina’s CMA Design studio, also featured in the top Coral Gables sales this quarter.
- 610 South Mashta Dr, a 6,500 SF home, completely redone in 2019 on a standard lot, sold in August for $14.6M or $2,250 per SF, to the owner and founder of a leading Latin American cosmetics conglomerate. A beautiful modern classic style home with Gaggenau appliances, smart home technology and a beautiful private deck.
- 641 S Mashta Dr, a brand new 3-level 5,000 SF home plus 2,200 SF rooftop, on an oversized lot, sold for $6.48M in mid June, almost $1,300 per SF. This sets a new record for dry lot homes on the Key. Of course this is a modern home with all the high-end amenities buyers expect at this price point: automation, 11ft ceilings, elevator, 40-ft atrium, etc.
Another important aspect to mention are the increased prices for entry-level homes, which are mostly Key Biscayne’s famous Mackle homes. Entry-level homes are now in the $2.5M range with the lowest-priced home listed at $2.899M (a renovated Mackle home), as of end of Q3. This represents the start of of a new era in which homes that are not located on large lots are trading for numbers that are above $1,000 per SF. Truly unusual numbers few would have envisioned six months ago!
One of the Most Significant Key Biscayne Home Sales

The 90-Day Key Biscayne Luxury Real Estate Report for the Condo Market
The Prices per SF
Sales Data and Months of Inventory

Talking about a record territory!! While the Key Biscayne’s condo boom kicked in 6 months later than the single-family boom, it’s been equally noticeable. A year ago (and for four years prior to that), there were 300+ Key Biscayne condos for sale in any given month. As of the end of Q3 we had just 132 listings. Monthly Condo sales volume has tripled from an average of just below 20 units per month in 2020 to approx. 60 since April.
Several record-breaking deals were seen in this third quarter of 2021. A great example of a record breaking deal is the sale of Oceana #902S, a 3,300 SF oceanfront condo, which broke the $2,000 per SF mark in June closing for $7.25M. This special unit was redone with the utmost care and high-end materials by designer Ramon Alonso, creating a truly special unit. In July, unit 1003S, another beautiful unit sold close to $2,000 per SF.
While the number of sales below the $1M mark has increased by slightly more than 50%, the star segment of Key Biscayne condos is the $1m-$3M segment where volume more than doubled compared to last year and tripled compared to 2019. With the key highlight being 6 sales above $1,000 per SF in the Towers of Key Biscayne, Key Colony and Island House.
In June, DSG’s Oceansound #938 sale in Key Colony set an all-time record for traditional Key Biscayne waterfront buildings by selling at $1,128 per SF. Since then, Towers of Key Biscayne B708 and B408, two Island house condos and another Key Colony unit have all sold above $1,000 per SF and as high as $1,363 per SF. Other top sales include Grand Bay Tower #1204, an incredibly renovated 3,680 SF residence with bay, ocean and city views, which sold in July for $4.6M ($1,250 per SF) and Ocean Tower #407, which sold in August for $4.25M ($1,187 per SF). This was a 3,600 SF remodeled unit.
One of the Most Significant Key Biscayne Condo Sales

Who is Buying in Key Biscayne?
In this 90-day period we have seen buyers from South America (Colombia & Peru) playing a key role in the ultra-luxury real estate market of Key Biscayne. Domestic buyers are still looking at Key Biscayne, but this group focuses mainly on ready-to-move-in and modern homes.
Why is Key Biscayne’s Inventory so Low?
In September 2021, only 21 condo units traded as low inventory led to a dramatic decrease in sales. For the single-family home market we saw an inventory of merely 29 homes in September. The demand for homes in Key Biscayne continues to be high as families are looking for the Resort-like lifestyle (driving golf carts around the island, kids going to school on their bikes, going to the beach, taking your boat out from your dock or from the marina, play tennis in one of the 40 tennis courts available). With 60 sales per month, Key Biscayne saw record highs in 2021 as previous years recorded an average of just 20 sales per month. A continuous demand and a limited amount of sellers has made this an extreme sellers market.
How much longer will this market be sustainable?
In September, the number of sales has slowed down for condos and homes, which is is normal for this time of the year. Data however shows a very high number of pending sales and properties under contract while demand is still high. We are still seeing ‘multiple-offer’ situations and sellers sticking to their prices. What is more, we are getting into our peak season; the fall and winter months. So, with the peak season coming, limited inventory, and record low interest rates, 2021 will continue to be a very tight market. If you want to know more about how sustainable this market is we invite you to read the below article, which dives further into this topic and discusses what could potentially change supply or demand in this market.
FAQ
These are the most commonly Miami Real Estate Related questions
What should relocation buyers know before buying real estate in Miami?
HOME BUYERS
Relocation buyers looking at homes in Miami should understand that choosing the right house is less about the property itself and more about location, schools, and long-term value. Many buyers make the mistake of focusing on price or finishes, while the real driver of value is the neighborhood and micro-location. Older homes often represent better value, but may also be part of a future redevelopment cycle. Newer homes command premiums, but don’t always sell faster if pricing is ahead of the market. Commute time, school access, and community dynamics are critical and often underestimated. The key is to evaluate homes not just as lifestyle purchases, but as long-term assets within a very localized market.
Sources:
https://luxlifemiamiblog.com/relocating-to-miami/
https://luxlifemiamiblog.com/relocating-to-miami-with-a-family/
CONDO BUYERS:
Relocation buyers should understand that Miami is a highly segmented, building-driven market, not a uniform one. Pricing can vary significantly between similar properties depending on building quality, layout, and financial health. Many buyers assume newer construction equals better investment, but that is often not the case. Factors like HOA fees, reserves, and rental policies can materially impact long-term value and liquidity. Negotiation opportunities often exist, especially in slower segments, but require precise market knowledge. The key is to evaluate micro-markets and individual buildings, not just neighborhoods or price per square foot.
Sources:
https://luxlifemiamiblog.com/miami-real-estate-market-report/
https://luxlifemiamiblog.com/new-construction-miami-guide/
What are the best areas for relocating families with children
For families relocating to Miami with young children, the most recommended neighborhoods are Coral Gables, Coconut Grove, and Pinecrest. Coral Gables offers the best balance of top schools, safety, and long-term value. Coconut Grove is ideal for younger families seeking walkability, greenery, and a lifestyle-driven environment. Pinecrest provides larger homes, excellent schools, and better value for space, making it ideal for growing families. The key driver across all three is access to strong schools and primary residential stability. Relocation decisions are less about new construction and more about long-term livability and resale strength.
Sources:
https://luxlifemiamiblog.com/best-neighborhoods-miami/
https://luxlifemiamiblog.com/what-are-the-best-family-neighborhoods-in-miami-in-2023/
Are new construction condos in Miami a good investment?
New construction condos in Miami can be a good investment—but only if you understand that not all buildings perform the same. According to the David Siddons Group, many buyers assume “new = better,” but in reality, performance depends on pricing, layout, building quality, and long-term demand. Some new developments set future price benchmarks and can drive long-term appreciation, especially in top-tier projects. However, many are priced aggressively at launch, and buyers relying on marketing instead of data often overpay.
The market is highly segmented, meaning two new buildings next to each other can perform very differently.
The best opportunities typically come from selecting the right building early or negotiating correctly in later phases.
In short: new construction is not automatically a good investment—it becomes one only with building-level analysis and disciplined entry pricing.
Sources:
https://luxlifemiamiblog.com/how-to-buy-a-luxury-condo-in-miami/
https://luxlifemiamiblog.com/category/independent-new-construction-condo-reviews/
https://luxlifemiamiblog.com/beyond-clickbait-real-insights-into-miamis-luxury-condo-market/
Why is buying a Miami condo riskier than buyers think?
Buying a Miami condo is often riskier than buyers expect because the true risks are at the building level—not visible in the listing price. Many buyers focus on finishes and views, while overlooking HOA reserves, insurance exposure, and potential special assessments. In reality, two identical units in different buildings can perform completely differently over time. Rising HOA fees and stricter regulations are also increasing the true cost of ownership, especially in older buildings. Liquidity can be affected by factors like financial health, rental policies, and ongoing repairs. The key risk is not the condo itself—but buying into the wrong building without proper due diligence.
Sources:
https://luxlifemiamiblog.com/how-to-buy-a-luxury-condo-in-miami/
https://luxlifemiamiblog.com/miami-condo-market-risks/
What are Miami's Safest Areas?
Which Miami Areas Still offer Great Value (Budget Friendly alternatives to Coral Gables and Pinecrest)
If you’re looking for better value than Coral Gables or Pinecrest, the answer (in true Siddons style) is not “go cheaper”—it’s go one layer outside the obvious markets.
The strongest value plays are:
- Schenley Park → closest substitute to Coral Gables at ~20% discount while maintaining similar character and location
- Biltmore Heights → almost identical feel to the Gables but ~25–30% cheaper on a $/SF basis
- Glenvar Heights → central location with larger lots and ~25% pricing advantage vs South Miami/Gables
- Baptist / Galloway (Kendall) → Pinecrest-style living (space, schools, land) at up to ~30% lower pricing
The pattern is consistent:
👉 Buyers are shifting west and slightly off-market to gain land, scale, and pricing efficiency. You don’t find value by going to a “cheaper neighborhood”—you find it by identifying adjacent micro-markets that offer the same lifestyle fundamentals without the brand premium.
Sources:
https://luxlifemiamiblog.com/best-value-neighborhoods-miami/
https://luxlifemiamiblog.com/category/miami-neighborhoods/
Is NOW a good time to buy in Miami?
Are Miami real estate prices going down in 2026?
No—but that’s the wrong way to look at it. Miami is not one market anymore, so prices are not moving in one direction. In 2026, the market is split into two: ultra-luxury, scarcity-driven areas (like waterfront and top-tier neighborhoods) are still holding or even rising, while mid-tier condos and oversupplied segments are flat or correcting. What we’re seeing is price divergence, not a crash—some properties are gaining value while others are quietly adjusting downward. Rising inventory and more selective buyers are putting pressure on pricing in certain segments, especially older condos or buildings with weaker fundamentals.
At the same time, global wealth and cash buyers continue to support pricing at the top end of the market. So the real answer: prices aren’t broadly dropping—they’re being repriced based on quality, location, and supply.
Should I buy a house or a condo when relocating to Miami?
The decision comes down to lifestyle first, investment second—and most relocation buyers get that backwards. If you want space, privacy, schools, and long-term family living, a single-family home in areas like Coral Gables or Coconut Grove is typically the stronger choice. If you prioritize walkability, low maintenance, and proximity to business districts, a condo in Brickell or waterfront markets makes more sense.
From an investment perspective, homes tend to be more stable, while condos are more building-dependent and cyclical. Most relocation clients underestimate how much building quality, HOA structure, and future costs impact condo performance. The right answer isn’t “house vs condo”—it’s which asset fits your lifestyle AND holds value within its micro-market.
How do I choose the right Miami neighborhood for my lifestyle?
Why are Miami condo prices so different between buildings?
Miami condo pricing varies widely because value is determined at the building level, not just by location. Two buildings next to each other can have major differences in financial health, reserves, HOA fees, and management quality. Buyers also pay premiums for better layouts, views, amenities, and newer construction—but not all “new” buildings perform equally. Factors like rental policies, upcoming assessments, and building reputation can significantly impact resale value. This is why price per square foot alone is misleading in Miami’s condo market. The real driver of value is how that specific building competes within its micro-market over time.
Sources:
https://luxlifemiamiblog.com/how-to-buy-a-luxury-condo-in-miami/
https://luxlifemiamiblog.com/category/independent-new-construction-condo-reviews/
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