Building facts
- Address
- 4100 Island Blvd.
- Neighborhood
- Aventura
- Year built
- 2013
- Floors
- 24
- Residences
- 67
- Status
- Completed
- Developer
- Martin Z. Margulies
- Pricing
- Starting at $1.7 Million
Verified 25 August 2026Miami-Dade County Property Appraiser1 source
Bellini Williams Island — photography to follow
Key Takeaways
- Sixty of the 67 homes are one of two floorplans — thirty at 2,235 square feet and thirty at 2,608, all three-bedrooms. That gives this building a genuine comparable set, which is rare at this price level.
- The main floorplan fell 28% in fifteen months — the 2,608 sq ft plan sold at $978 per square foot in February 2025. By September it was $690, and in May 2026 $700. Same plan, same building.
- While the largest home set an all-time record — in June 2026 a 4,955 square foot residence sold for $5,250,000 — $1,060 per square foot, the highest price and highest per-foot figure the building has ever recorded.
- So the top and the middle of the building moved in opposite directions — over the same fifteen months. That divergence is the single most useful fact here, and a building-wide average conceals it completely.
- Every home is at least three bedrooms and 2,235 square feet — sixty three-bedrooms, six four-bedrooms and one six-bedroom. There is no one-bedroom and no two-bedroom in the building.
- The county assesses the 67 homes five-fold apart — from $718,961 to $3,566,520 for 2026, a median of $1,254,424.
Bellini Williams Island, by the numbers
Developer: Martin Z. Margulies · Starting at $1.7 Million. Source: the building record on this site.
4100 Island Boulevard, Miami, Florida | Neighborhood: Williams Island, Aventura
Bellini at Williams Island is 67 homes, and almost all of them are one of two three-bedroom floorplans. That symmetry makes something visible here that most buildings hide: over the last fifteen months the main floorplan has fallen 28% per square foot, while the largest home in the building set an all-time record. Both facts are true and they belong together.
What the county records at 4100 Island Boulevard
The Miami-Dade County Property Appraiser returns 69 folios at 4100 Island Boulevard in one declaration, BELLINI AT WILLIAMS ISLAND CONDO. Sixty-seven are homes and two are commercial folios, which are excluded from every figure below. The common-element shares close at 99.9977%, within rounding of the whole, so nothing is missing from the pull.
The homes run 2,235 to 4,955 square feet, median 2,608, and the mix is heavily concentrated: thirty homes at 2,235 sq ft, thirty at 2,608, four at 4,955, two at 4,843 and one other. Sixty are three-bedrooms, six are four-bedrooms and one is a six-bedroom. There is no one-bedroom and no two-bedroom here at all.
For 2026 the county assesses the 67 homes from $718,961 to $3,566,520, a median of $1,254,424.
The middle fell while the top hit a record
Thirty homes share the 2,608 square foot plan, so its recent sales are directly comparable to one another — same size, same layout, same building.
| Date | Price | $/sq ft |
|---|---|---|
| 27 February 2025 | $2,550,000 | $978 |
| 17 April 2025 | $2,500,000 | $959 |
| 4 June 2025 | $2,487,500 | $954 |
| 27 September 2025 | $1,800,000 | $690 |
| 29 May 2026 | $1,825,000 | $700 |
Three sales in the first half of 2025 clustered tightly between $954 and $978 per square foot. The next two, in September 2025 and May 2026, came in at $690 and $700 — a fall of roughly 28% on the identical floorplate, and the two most recent readings agree with each other.
Over the same period the top of the building did the opposite. The 4,955 square foot plan sold for $4,455,000 in November 2024 ($899 per square foot) and then $5,250,000 in June 2026 — $1,060 per square foot, the highest total price and the highest per-foot figure in the building’s record. Its previous benchmark was $4,650,000, set back in April 2015.
So the largest homes reached a record in the same window that the most common plan gave up more than a quarter of its per-foot value. Any single average across this building for 2025 and 2026 blends those two movements into a number that describes neither.
The price record across four years
| Year | Qualified sales | Median price | Median $/sq ft |
|---|---|---|---|
| 2023 | 5 | $1,700,000 | $690 |
| 2024 | 4 | $2,102,500 | $852 |
| 2025 | 5 | $2,487,500 | $954 |
| 2026 to date | 2 | $3,537,500 | $880 |
These rows are honest but they flatter the picture, and the reason is mix. The 2026 median rests on two sales — one 2,608 sq ft home and one 4,955 sq ft penthouse — so a median of $3,537,500 is the midpoint of two very different properties rather than a price level. The 2025 median is pulled up by the three strong sales early in the year and does not reflect the September reading.
The single-plan table above is the more reliable guide, and it says the 2,608 plan is currently trading around $700 per square foot, not $954.
The building has recorded 118 qualified sales since 2013, sixteen of them in the last four years, which is a healthy rate for 67 homes.
Who this building suits, and who it does not
It suits a buyer who wants a large three-bedroom with real comparables. Thirty homes share each of the two main plans and the building trades regularly. At this price point that combination is genuinely unusual and it makes valuation here far less speculative than in a boutique building.
It suits a buyer looking at the 2,608 plan right now. The two most recent sales of that plan are 28% per foot below where it traded in early 2025, and they agree with one another. Whether that is a correction or a pair of specific circumstances, it is the current evidence.
It suits badly anyone pricing a mid-size home off the penthouse. The June 2026 record at $1,060 per foot is a 4,955 square foot home. It says nothing about the 2,608 plan, which sold at $700 three weeks earlier.
And it suits badly a buyer who needs a smaller home. The minimum here is 2,235 square feet and three bedrooms.
If you are selling here: use your own plan and use the most recent sales, not the 2025 peak. If you own the 2,608, your comparable set is $1,800,000 (September 2025) and $1,825,000 (May 2026), and a valuation anchored to February 2025’s $2,550,000 will sit on the market. If you own one of the four largest homes, the opposite applies — June 2026 set a record and it is recent.
Bellini at Williams Island — Frequently Asked Questions
How many units are in Bellini at Williams Island?
67 homes. The county returns 69 folios at 4100 Island Boulevard, two of which are commercial. The declaration’s common-element shares close at 99.9977%, within rounding of the whole, so nothing is missing.
What floorplans does Bellini at Williams Island have?
It is dominated by two: thirty homes at 2,235 square feet and thirty at 2,608, all three-bedrooms. There are also four at 4,955 sq ft and two at 4,843. Every home has at least three bedrooms and the smallest is 2,235 square feet.
What is the highest price paid at Bellini at Williams Island?
$5,250,000, in June 2026, for a 4,955 square foot residence at $1,060 per square foot — both the highest total price and the highest per-foot figure the building has recorded.
Are prices at Bellini at Williams Island rising or falling?
Both, depending on the floorplan. The 2,608 sq ft plan traded between $954 and $978 per square foot in the first half of 2025, then at $690 in September 2025 and $700 in May 2026 — down about 28%. Over the same period the 4,955 sq ft plan set an all-time record. A single building-wide figure will mislead you.
How often do homes sell at Bellini at Williams Island?
118 qualified sales since 2013, including sixteen in the last four years. For a 67-home building that is an active market and it means comparables are usually available.
Sources and further reading
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Josh Stein · Florida real estate sales associate, license SL3057661 · (305) 695-8257 · hello@joshsteinrealtor.comRelated coverage
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